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Melrose Industries

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FY2018 Annual Report · Melrose Industries
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Dear fellow shareholders,

2018  was  a  year  of  differentiated  execution  for  Marathon  Oil.  While  many  in  our  industry 
talked about capital discipline, we delivered. 

We budgeted conservatively in 2018, and never wavered. We drove significant improvement 
to our corporate returns and cash flow per debt adjusted share. Our teams meaningfully beat 
our initial oil production growth guidance through impressive capital efficiency gains across 
our portfolio, and achieved remarkable success in organically improving the quality of our 
inventory base through core extension efforts, especially in the Eagle Ford and Bakken.

Through improving capital efficiency we delivered more oil growth, generated $865 million 
of  organic  free  cash  flow  post-dividend,  and  returned  most  of  that  cash  back  to  you,  our 
shareholders,  via  share  repurchases.    Over  25%  of  our  2018  net  operating  cash  flow  was 
returned to shareholders through the combination of our dividend and repurchases.

We know investors today are looking for companies that have the right portfolio of assets and 
the right strategy: putting returns first, generating sustainable free cash flow at conservative 
oil prices and sharing that cash flow with investors. You want to see companies that maintain 
a strong balance sheet to weather potential volatility, and companies that have the capability 
to  execute  on  their  commitments  consistently.  Our  company  priorities  not  only  align  with 
these criteria, but our performance in 2018 stands as our proof point.

As we turn to 2019 and beyond, Marathon Oil remains committed to this same framework for 
success. With the foundation of a peer leading balance sheet and the competitive advantages 
of our multi-basin portfolio, our 2019 capital program will drive improving corporate returns 
and generate organic free cash flow above $45 WTI post dividend. Importantly, while our 
2019  free  cash  flow  is  robust  across  a  broad  range  of  commodity  prices,  we  believe  our 
outlook only improves into 2020.

We would like to thank all of our dedicated employees and contractors who made 2018 a 
year of such differentiated execution for our company. Our future has never been brighter 
since becoming an independent E&P.

Lee M. Tillman 
Chairman, President and 
Chief Executive Officer

Gregory H. Boyce 
Independent Lead Director

UNITED STATES 
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-K

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934
For the Fiscal Year Ended December 31, 2018 

Commission file number 1-5153

Marathon Oil Corporation

(Exact name of registrant as specified in its charter)

Delaware
(State or other jurisdiction of incorporation or organization)

25-0996816
(I.R.S. Employer Identification No.)

5555 San Felipe Street, Houston, TX 77056-2723
(Address of principal executive offices)
(713) 629-6600
(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class
Common Stock, par value $1.00

Name of each exchange on which registered
New York Stock Exchange

 Securities registered pursuant to Section 12(g) of the Act:  None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.  Yes 

No 

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.  Yes  

No  

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15 (d) of the Securities Exchange Act of 1934 during the 
preceding 12 months and (2) has been subject to such filing requirements for the past 90 days.  Yes 

   No 

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-
T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).  Yes 

    No 

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of 
registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging 
growth company.  See the definitions of "large accelerated filer," "accelerated filer", "smaller reporting company," and "emerging growth company" in Rule 12b-2 of 
the Exchange Act. 

Large accelerated filer 

Accelerated filer 

                  Non-accelerated filer 

Smaller reporting company 

Emerging growth company 

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised 

financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.      

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).  Yes  

  No   

The aggregate market value of Common Stock held by non-affiliates as of June 30, 2018: $17,781 million.  This amount is based on the closing price of the 
registrant’s Common Stock on the New York Stock Exchange on that date.  Shares of Common Stock held by executive officers and directors of the registrant are not 
included in the computation.  The registrant, solely for the purpose of this required presentation, has deemed its directors and executive officers to be affiliates.

There were 818,504,459 shares of Marathon Oil Corporation Common Stock outstanding as of February 14, 2019.

Documents Incorporated By Reference:
Portions of the registrant’s proxy statement relating to its 2019 Annual Meeting of Stockholders, to be filed with the Securities and Exchange Commission pursuant to 
Regulation 14A under the Securities Exchange Act of 1934, are incorporated by reference to the extent set forth in Part III, Items 10-14 of this report.

 
 
 
   
 
MARATHON OIL CORPORATION

Unless the context otherwise indicates, references to "Marathon Oil," "we," "our" or "us" in this Annual Report on Form 10-
K are references to Marathon Oil Corporation, including its wholly owned and majority-owned subsidiaries, and its ownership 
interests in equity method investees (corporate entities, partnerships, limited liability companies and other ventures over which 
Marathon Oil exerts significant influence by virtue of its ownership interest).

Table of Contents

PART I

Item 1.

Business

Item 1A. Risk Factors

Item 1B. Unresolved Staff Comments

Item 2.

Properties

Item 3.

Legal Proceedings

Item 4. Mine Safety Disclosures

PART II

Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of 

Equity Securities

Item 6.

Selected Financial Data

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

Item 7A. Quantitative and Qualitative Disclosures About Market Risk

Item 8.

Financial Statements and Supplementary Data

Item 9.

Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

Item 9A. Controls and Procedures

Item 9B. Other Information

PART III

Item 10. Directors, Executive Officers and Corporate Governance

Item 11. Executive Compensation

Item 12.

Security  Ownership  of  Certain  Beneficial  Owners  and  Management  and  Related  Stockholder 
Matters

Item 13. Certain Relationships and Related Transactions, and Director Independence

PART IV

Item 14.

Principal Accountant Fees and Services

Item 15. Exhibits, Financial Statement Schedules

Item 16.

Form 10-K Summary

SIGNATURES

5

15

23

23

24

24

25

26

27

50

51

115

115

115

116

116

116

117

117

118

118

119

Definitions

Throughout this report, the following company or industry specific terms and abbreviations are used.

AMPCO – Atlantic Methanol Production Company LLC, a company located in Equatorial Guinea in which we own a 45% 
equity interest.

AOSP – Athabasca Oil Sands Project, an oil sands mining, transportation and upgrading joint venture located in Alberta, 
Canada, in which we held a 20% non-operated working interest.

bbl – One stock tank barrel, which is 42 United States gallons liquid volume.

bcf – Billion cubic feet.

boe – Barrels of oil equivalent.

btu – British thermal unit, an energy equivalence measure.

Capital Budget – Includes capital expenditures, cash investments in equity method investees and other investments, exploration 
costs that are expensed as incurred rather than capitalized, such as geological and geophysical costs and certain staff costs, and 
other miscellaneous investment expenditures.

Development Capital Budget – Includes expenditures, investments and costs associated with the Capital Budget excluding 
resource play leasing and exploration ("REx"). 

DD&A – Depreciation, depletion and amortization.

Development well – A well drilled within the proved area of an oil or natural gas reservoir to the depth of a stratigraphic horizon 
known to be productive.

Dry well – A well found to be incapable of producing either oil or natural gas in sufficient quantities to justify completion as an 
oil or gas well.

E.G. – Equatorial Guinea.

EGHoldings – Equatorial Guinea LNG Holdings Limited, a liquefied natural gas production company located in E.G. in which 
we own a 60% equity interest.

EPA – United States Environmental Protection Agency.

E&P – Exploration and production.

Exploratory well – A well drilled to find oil or natural gas in an unproved area or find a new reservoir in a field previously 
found to be productive in another reservoir.

FASB – Financial Accounting Standards Board.

Henry Hub price – a natural gas benchmark price quoted at settlement date average.

IRS – United States Internal Revenue Service.

Kurdistan – Kurdistan Region of Iraq

LNG – Liquefied natural gas.

LPG – Liquefied petroleum gas.

Liquid hydrocarbons or liquids – Collectively, crude oil, condensate and natural gas liquids.

LLS – Louisiana Light Sweet crude oil, an oil index benchmark price as per Bloomberg Finance LLP:  LLS St. James.

Marathon Oil – Marathon Oil Corporation, including wholly owned and majority-owned subsidiaries, and ownership interests 
in equity method investees (corporate entities, partnerships, limited liability companies and other ventures over which Marathon 
Oil exerts significant influence by virtue of its ownership interest).  The company as it exists following the June 30, 2011 spin-
off of the refining, marketing and transportation operations.

mbbld – Thousand barrels per day.

mboed – Thousand barrels of oil equivalent per day.

mcf – Thousand cubic feet.

mmbbl – Million barrels.

1

mmboe – Million barrels of oil equivalent.  Natural gas is converted on the basis of six mcf of gas per one barrel of crude oil 
equivalent.

mmbtu – Million British thermal units.

mmcfd – Million stabilized cubic feet per day.

mmta – Million metric tonnes per annum.

MPC – Marathon Petroleum Corporation – the separate independent company, which owns and operates the refining, marketing 
and transportation operations.

mt – metric tonnes

mtd – metric tonnes per day.

Net acres or Net wells – The sum of the fractional working interests owned by us in gross acres or gross wells.

NGL or NGLs – Natural gas liquid or natural gas liquids, which are naturally occurring substances found in natural gas, 
including ethane, butane, isobutane, propane and natural gasoline, which can be collectively removed from produced natural 
gas, separated into these substances and sold. 

NYMEX – New York Mercantile Exchange. 

OECD – Organization for Economic Cooperation and Development.

OPEC – Organization of Petroleum Exporting Countries.

Operational availability – A term used to measure the ability of an asset to produce to its maximum capacity over a specified 
period of time, after consideration of internal losses.

Productive well – A well that is not a dry well.  Productive wells include producing wells and wells that are mechanically 
capable of production.

Proved developed reserves – Proved reserves that can be expected to be recovered through existing wells with existing 
equipment and operating methods or for which the cost of the required equipment is relatively minor compared to the cost of a 
new well.

Proved reserves – Proved crude oil and condensate, NGLs, natural gas and our historical synthetic crude oil reserves are those 
quantities of crude oil and condensate, NGLs, natural gas and synthetic crude oil, which, by analysis of geoscience and 
engineering data, can be estimated with reasonable certainty to be economically producible from a given date forward, from 
known reservoirs, and under existing economic conditions, operating methods, and government regulations-prior to the time at 
which contracts providing the right to operate expire, unless evidence indicates that renewal is reasonably certain, regardless of 
whether deterministic or probabilistic methods are used for the estimation. The project to extract the hydrocarbons must have 
commenced or the operator must be reasonably certain that it will commence the project within a reasonable time.

Proved undeveloped reserves – Proved reserves that are expected to be recovered from new wells on undrilled acreage, or from 
existing wells where a relatively major expenditure is required for recompletion.  Undrilled locations can be classified as having 
proved undeveloped reserves if a development plan has been adopted indicating that they are scheduled to be drilled within five 
years, unless the specific circumstances justify a longer time.  Reserves on undrilled acreage shall be limited to those directly 
offsetting development spacing areas that are reasonably certain of production when drilled, unless evidence using reliable 
technology exists that establishes reasonable certainty of economic viability at greater distances.

Reserve replacement ratio – A ratio which measures the amount of proved reserves added to our reserve base during the year 
relative to the amount of liquid hydrocarbons and natural gas produced.

Royalty interest – An interest in an oil or natural gas property entitling the owner to a share of oil or natural gas production free 
of costs of production.

SAR or SARs – Stock appreciation right or stock appreciation rights.

SCOOP – South Central Oklahoma Oil Province.

SEC – United States Securities and Exchange Commission.

Seismic – An exploration method of sending energy waves or sound waves into the earth and recording the wave reflections to 
indicate the type, size, shape and depth of subsurface rock formation (3-D seismic provides three-dimensional pictures and 4-D 
factors in changes that occurred over time).

STACK – Sooner Trend, Anadarko (basin), Canadian (and) Kingfisher (counties). 

2

TD – Total depth or the bottom of a drilled hole.  

Total proved reserves – The summation of proved developed reserves and proved undeveloped reserves.

U.K. – United Kingdom.

U.S. – United States of America.

U.S. resource plays – Consists of our unconventional properties in the Oklahoma, Eagle Ford, Bakken and Northern Delaware.

U.S. GAAP – U.S. Generally Accepted Accounting Principles.

Working interest – The interest in a mineral property, which gives the owner that share of production from the property.  A 
working interest owner bears that share of the costs of exploration, development and production in return for a share of 
production.  Working interests are sometimes burdened by overriding royalty interests or other interests.

WTI – West Texas Intermediate crude oil, an oil index benchmark price as quoted by NYMEX.

3

Disclosures Regarding Forward-Looking Statements

This Annual Report on Form 10-K contains forward-looking statements within the meaning of Section 27A of the 

Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934. These are statements, other than statements of 
historical fact, that give current expectations or forecasts of future events, including without limitation: our operational, 
financial and growth strategies, including drilling plans and projects, planned wells, rig count, inventory, seismic, exploration 
plans, maintenance activities, drilling and completion improvements, cost reductions, non-core asset sales, and financial 
flexibility; our ability to successfully effect those strategies and the expected timing and results thereof; our 2019 Capital 
Budget and the planned allocation thereof; planned capital expenditures and the impact thereof; expectations regarding future 
economic and market conditions and their effects on us; our financial and operational outlook, and ability to fulfill that outlook; 
our financial position, balance sheet, liquidity and capital resources, and the benefits thereof; resource and asset potential; 
reserve estimates; growth expectations; and future production and sales expectations, and the drivers thereof. In addition, many 
forward-looking statements may be identified by the use of forward-looking terminology such as “anticipates,” “believes,” 
“estimates,” “expects,” “targets,” “plans,” “projects,” “could,” “may,” “should,” “would” or similar words indicating that future 
outcomes are uncertain. While we believe that our assumptions concerning future events are reasonable, these expectations may 
not prove to be correct. A number of factors could cause results to differ materially from those indicated by such forward-
looking statements including, but not limited to: 

• 

• 

• 

• 

• 

• 

• 

• 

• 

conditions in the oil and gas industry, including supply and demand levels for crude oil and condensate, NGLs and 
natural gas and the resulting impact on price; 

changes in expected reserve or production levels;

changes in political or economic conditions in the jurisdictions in which we operate, including changes in foreign 
currency exchange rates, interest rates, inflation rates, and global and domestic market conditions;

risks related to our hedging activities; 

liability resulting from litigation;

capital available for exploration and development;

the inability of any party to satisfy closing conditions or delays in execution with respect to our asset acquisitions and 
dispositions;

drilling and operating risks; 

lack of, or disruption in, access to pipelines or other transportation methods;

•  well production timing; 

• 

• 

• 

• 

• 

• 
• 

• 

availability of drilling rigs, materials and labor, including the costs associated therewith; 

difficulty in obtaining necessary approvals and permits; 

non-performance by third parties of their contractual obligations; 

unforeseen hazards such as weather conditions, acts of war or terrorist acts and the governmental or military response 
thereto;

cyber-attacks; 

changes in safety, health, environmental, tax and other regulations; 
other geological, operating and economic considerations; and

other factors discussed in Item 1. Business, Item 1A. Risk Factors, Item 7. Management’s Discussion and Analysis of 
Financial Condition and Results of Operations, Item 7A. Quantitative and Qualitative Disclosures About Market Risk, 
and elsewhere in this report.

All forward-looking statements included in this report are based on information available to us on the date of this report. 
Except as required by law, we undertake no obligation to revise or update any forward-looking statements as a result of new 
information, future events or otherwise. All subsequent written and oral forward-looking statements attributable to us or persons 
acting on our behalf are expressly qualified in their entirety by the cautionary statements contained throughout this report.

4

Item 1. Business  

General

PART I

Marathon Oil Corporation (NYSE: MRO) is an independent exploration and production company based in Houston, Texas, 
focused on U.S. resource plays with operations in the United States, Europe and Africa. Our corporate headquarters is located at 
5555 San Felipe Street, Houston, Texas 77056-2723 and our telephone number is (713) 629-6600.  Each of our two reportable 
operating segments are organized by geographic location and managed according to the nature of the products and services 
offered.  The two segments are:

•  United States – explores for, produces and markets crude oil and condensate, NGLs and natural gas in the United 

States;

• 

International – explores for, produces and markets crude oil and condensate, NGLs and natural gas outside of the 
United States and produces and markets products manufactured from natural gas, such as LNG and methanol, in E.G.

We were incorporated in 2001.  On July 1, 2011 we became an Independent E&P after we completed the spin-off of our 

refining, marketing and transportation business, creating two independent energy companies: Marathon Oil and MPC.

Our strategy is to deliver competitive and improving corporate level returns by focusing our capital investment in the lower 

cost, higher margin U.S. resource plays while maintaining a peer-leading balance sheet, prioritizing sustainable cash flow 
generation at conservative oil prices, and returning capital to shareholders.  See Item 7. Management's Discussion and 
Analysis of Financial Condition and Results of Operations, for a more detailed discussion of our operating results, cash 
flows and liquidity.

Our portfolio is concentrated in our core operations in the U.S. resource plays and E.G.  The map below shows the 

locations of our core operations:

* Our additional locations include the U.K, the Kurdistan Region of Iraq (executed a sales agreement in 2018) and other United States locations.

Segment Information

In the following discussion regarding our United States and International segments, references to net wells, acres, sales or 

investment indicate our ownership interest or share, as the context requires. During the year, we renamed our United States 
E&P and International E&P segments to the United States and International segments.  The characteristics and composition of 
these segments remained unchanged and there was no effect on previously reported segment information.  See Note 1 for 
further information.

5

United States Segment

We are engaged in oil and gas exploration, development and production activities in the U.S.  Our primary focus in the 
United States segment is concentrated within our four high quality resource plays.  See Item 7. Management's Discussion and 
Analysis of Financial Condition and Results of Operations for further detail on current year results.

United States – U.S. Resource Plays 

Eagle Ford – We have been operating in the South Texas Eagle Ford play since 2011, where roughly two thirds of our 
acreage is located in Karnes and Atascosa Counties.  Our focus is capital efficient development with a goal of maximizing 
returns and cash flow generation while extending our core acreage.  We operate 32 central gathering and treating facilities 
across the play that support more than 1,600 producing wells. We also own and operate the Sugarloaf gathering system, a 42-
mile natural gas pipeline through the heart of our acreage in Karnes and Atascosa Counties. 

Bakken – We have been operating in the Williston Basin since 2006. The majority of our core acreage is within McKenzie, 
Mountrail, and Dunn Counties in North Dakota targeting the Middle Bakken and Three Forks reservoirs. We continue focusing 
our investment in our high-return Myrmidon and Hector areas, while also delineating our position across the rest of our acreage. 

Oklahoma – With a history in Oklahoma that dates back more than 100 years, our primary focus has recently been the 

transition to early infill development in the STACK Meramec and SCOOP Woodford, while progressing delineation of other 
plays across our footprint.  We primarily hold net acreage with rights to the Woodford, Springer, Meramec, Osage and other 
prospect intervals, with a majority of this in the SCOOP and STACK. 

Northern Delaware – We have been operating in the Northern Delaware basin, which is located within the greater Permian 

area, since we closed on two major acquisitions in 2017.  These acquisitions gave us a strong foundational footprint in the 
region where we have the majority of our acreage in Eddy and Lea counties primarily in the Wolfcamp and Bone Spring New 
Mexico plays.  Our focus since entering the play has been to strategically advance our position and prepare for future 
development by further coring up our footprint, progressing early delineation of our acreage, improving our cost structure and 
securing midstream solutions.  See Item 8. Financial Statements and Supplementary Data – Note 4 to the consolidated financial 
statements for further detail.   

Other United States 

Our remaining properties in the United States primarily consist of our newly acquired acreage in the emerging Louisiana 

Austin Chalk play and outside operated assets in the Gulf of Mexico, including our 3.5% overriding royalty interest in the Ursa 
fields.  During 2018 we acquired approximately 260,000 net acres in the Louisiana Austin Chalk play at a cost of less than $850 
per acre.  Additionally, in the fourth quarter 2018, we entered into an agreement to sell our working interest in the Droshky 
field, in the Gulf of Mexico, and as a result it is classified as held for sale in the consolidated balance sheet at December 31, 
2018.  This transaction closed in the first quarter of 2019. 

During 2018 we closed on the sale of several non-core conventional properties, see Item 8. Financial Statements and 

Supplementary Data – Note 5 to the consolidated financial statements for further detail.   

International Segment 

We are engaged in oil and gas development and production across our international locations primarily in E.G. and U.K.  
We include the results of our LPG processing plant, gas liquefaction operations and methanol production operations in E.G. in 
our International segment. 

International 

Equatorial Guinea – We own a 63% operated working interest under a production sharing contract in the Alba field and an 

80% operated working interest in Block D, both of which are offshore E.G.  Operational availability from our company-
operated facilities averaged approximately 97% in 2018. 

Equatorial Guinea – Gas Processing – We own a 52% interest in Alba Plant LLC, accounted for as an equity method 
investment, which operates an onshore LPG processing plant located on Bioko Island.  Alba field natural gas, under a long-term 
contract at a fixed price per btu, is processed by the LPG plant.  The LPG plant extracts secondary condensate and LPG from 
the natural gas stream and uses some of the remaining dry natural gas in its operations. 

We also own 60% of EGHoldings and 45% of AMPCO, both accounted for as equity method investments.  EGHoldings 

operates a 3.7 mmta LNG production facility and AMPCO operates a methanol plant, both located on Bioko Island.  These 
facilities allow us to further monetize natural gas production from the Alba field.  The LNG production facility sells LNG under 
a 3.4 mmta sales and purchase agreement.  Under the agreement, which runs through 2023, the purchaser takes delivery of the 
LNG on Bioko Island, with pricing linked principally to the Henry Hub index.  Gross sales of LNG from this production facility 

6

totaled approximately 3.5 mmta in 2018. AMPCO had gross sales totaling approximately 1,000 mt in 2018.  Methanol 
production is sold to customers in Europe and the U.S. 

United Kingdom – Our operated assets in the U.K. sector of the North Sea are the Brae area complex where we have a 42% 

working interest in the South, Central, North and West Brae fields, a 39% working interest in the East Brae field, and a 28% 
working interest in the nearby Braemar field.  We own non-operated working interests in the Foinaven area complex, consisting 
of a 28% working interest in the main Foinaven field, a 47% working interest in East Foinaven and a 20% working interest in 
the T35 and T25 fields.  

Libya – In the first quarter of 2018, we closed on the sale of our subsidiary, Marathon Oil Libya Limited, which held our 
16.33% non-operated interest in the Waha concessions in Libya.  See Item 8. Financial Statements and Supplementary Data – 
Note 5 to the consolidated financial statements for further detail. 

Other International 

Kurdistan Region of Iraq – We have a non-operated 15% working interest in the Atrush block located north-northwest of 

Erbil.  During the fourth quarter of 2018, we entered into an agreement to sell our Kurdistan subsidiary, Marathon Oil KDV 
B.V., and as a result it is classified as held for sale in the consolidated balance sheet at December 31, 2018.  We expect this 
transaction to close in the first half of 2019 which will complete our full country exit from Kurdistan. 

Additionally during 2018, we entered into separate agreements to sell certain non-core properties in our International 
segment.  See Item 8. Financial Statements and Supplementary Data - Note 5 to the consolidated financial statements for 
information about these dispositions.

Reserves

Proved reserves are required to be disclosed by continent and by country if the proved reserves related to any geographic 

area, on an oil equivalent barrel basis, represent 15% or more of our total proved reserves.  A geographic area can be an 
individual country, group of countries within a continent or a continent.  Other International ("Other Int’l"), includes the U.K. 
and the Kurdistan Region of Iraq.  Approximately 86% of our proved reserves are located in OECD countries, with 84% located 
within the U.S.

The following tables set forth estimated quantities of our total proved crude oil and condensate, NGLs and natural gas 

reserves based upon SEC pricing for period ended December 31, 2018.

December 31, 2018
Proved Developed Reserves

Crude oil and condensate (mmbbl)

Natural gas liquids (mmbbl)

Natural gas (bcf)

Total proved developed reserves (mmboe)

Proved Undeveloped Reserves

Crude oil and condensate (mmbbl)

Natural gas liquids (mmbbl)

Natural gas (bcf)

Total proved undeveloped reserves  (mmboe)

Total Proved Reserves

Crude oil and condensate (mmbbl)

Natural gas liquids (mmbbl)

Natural gas (bcf)

Total proved reserves (mmboe)

  U.S. 

E.G.  

Other Int'l

Total

287

119

869

552

308

105

684

526

595

224

1,553

1,078

36

22

715

176

—

—

—

—

36

22

715

176

22

—

7

24

3

—

—

3

25

—

7

27

345

141

1,591

752

311

105

684

529

656

246

2,275

1,281

Of the total estimated proved reserves, approximately 51% was crude oil and condensate.  As of December 31, 2018, our 

estimated proved developed reserves totaled 752 mmboe or 59% and estimated proved undeveloped reserves totaling 529 
mmboe or 41% of our total proved reserves.  For additional detail on reserves, see Item 8. Financial Statements and 
Supplementary Data - Supplementary Information on Oil and Gas Producing Activities. 

7

 
 
Productive and Drilling Wells

For our United States and International segments, the following table sets forth gross and net productive wells, service 

wells and drilling wells as of December 31 for the years presented.

Productive Wells

Oil

Natural Gas

Gross

Net

Gross

Net

Service Wells  
Net

Gross

Drilling Wells
Net

Gross

43
—
—
43

18
—
—
18

2018

U.S. (a) 
E.G.
Other International

Total

2017
U.S.

E.G.
Libya (b)
Total Africa
Other International

Total

2016
U.S.

E.G.
Libya

Total Africa
Other International

Total

4,630
—
62
4,692

5,132
—
1,071
1,071
61
6,264

4,533
—
1,071
1,071
62
5,666

2,056
—
22
2,078

1,905
—
175
175
22
2,102

1,650
—
175
175
23
1,848

1,703
19
11
1,733

1,690
19
7
26
19
1,735

1,830
17
7
24
35
1,889

655
12
4
671

676
12
2
14
7
697

708
11
1
12
14
734

209
—
24
233

799
—
94
94
23
916

821
2
94
96
23
940

21
—
8
29

70
—
16
16
8
94

85
1
16
17
8
110

(a) 

(b) 

The 2018 decrease in gross productive oil wells and gross service wells is a result of the sale of non-core, non-operated conventional properties in the 
United States segment during the third quarter of 2018.  See Item 8. Financial Statements and Supplementary Data - Note 5 to the consolidated financial 
statements for information about these dispositions.
Libya was removed from 2018 due to the sale of our subsidiary in Libya, see Item 8. Financial Statements and Supplementary Data - Note 5 to the 
consolidated financial statements for further information.

8

 
 
 
 
 
 
  
Drilling Activity

For our United States and International segments, the table below sets forth, by geographic area, the number of net 

productive and dry development and exploratory wells completed as of December 31 for the years represented.   

Development

Exploratory

Oil

Natural
Gas

Dry

Total

Oil

Natural
Gas

Dry

Total

Total

171
—
—
171

107
—
—
—
—
107

64
—
—
—
—
64

25
—
—
25

27
—
—
—
—
27

12
—
—
—
—
12

—
—
—
—

—
—
—
—
—
—

—
—
—
—
—
—

196
—
—
196

134
—
—
—
—
134

76
—
—
—
—
76

66
—
—
66

88
—
—
—
—
88

70
—
—
—
—
70

36
—
—
36

16
—
—
—
—
16

27
—
—
—
—
27

2
1
—
3

—
—
—
—
2
2

3
—
1
1
—
4

104
1
—
105

104
—
—
—
2
106

100
—
—
1
—
101

300
1
—
301

238
—
—
—
2
240

176
—
—
1
—
177

2018
U.S.
E.G.
Other International

Total

2017
U.S.

E.G.
Libya

Total Africa
Other International

Total

2016
U.S.

E.G.
Libya

Total Africa
Other International

Total

Acreage

We believe we have satisfactory title to our United States and International properties in accordance with standards 
generally accepted in the industry; nevertheless, we can be involved in title disputes from time to time which may result in 
litigation.  In the case of undeveloped properties, an investigation of record title is made at the time of acquisition.  Drilling title 
opinions are usually prepared before commencement of drilling operations.  Our title to properties may be subject to burdens 
such as royalty, overriding royalty, carried, net profits, working and other similar interests and contractual arrangements 
customary in the industry.  In addition, our interests may be subject to obligations or duties under applicable laws or burdens 
such as net profits interests, liens related to operating agreements, development obligations or capital commitments under 
international production sharing contracts or exploration licenses.

The following table sets forth, by geographic area, the gross and net developed and undeveloped acreage held in our United 

States and International segments as of December 31, 2018. 

(In thousands)
U.S.

E.G.

Other International

Total

Developed

Undeveloped

Developed and
Undeveloped

Gross    

Net

Gross    

Net

Gross    

Net

1,352

1,004

82

82

67

29

1,516

1,100

484

54

71

609

356

36

12

404

1,836

1,360

136

153

103

41

2,125

1,504

9

 
  
 
In the ordinary course of business, based on our evaluations of certain geologic trends and prospective economics, we have 
allowed certain lease acreage to expire and may allow additional acreage to expire in the future.  If production is not established 
or we take no other action to extend the terms of the leases, licenses or concessions, undeveloped acreage listed in the table 
below will expire over the next three years.  We plan to continue the terms of certain of these licenses and concession areas or 
retain leases through operational or administrative actions.

(In thousands)
U.S.
E.G.(a)

Total

Net Undeveloped Acres Expiring

Year Ended December 31,

2019

2020

2021

31

36

67

64

—

64

134

—

134

(a) 

This relates to the conclusion of our evaluation of drilling opportunities on the Rodo well in Alba Block Sub Area B, offshore E.G. and in 2018 
determined that we would not pursue further activity.

Net Sales Volumes

Year Ended December 31,
2018
Crude and condensate (mbbld)(a)
Natural gas liquids (mbbld)
Natural gas (mmcfd)(b)

Total sales volumes (mboed)

2017
Crude and condensate (mbbld)(a)
Natural gas liquids (mbbld)
Natural gas (mmcfd)(b)
Synthetic crude oil (mbbld)(c)

Total sales volumes (mboed)

2016
Crude and condensate (mbbld)(a)
Natural gas liquids (mbbld)
Natural gas (mmcfd)(b)
Synthetic crude oil (mbbld)(c)

Africa

  U.S. 

E.G.  

Libya

Other
Int'l

Cont
Ops

Disc
Ops

Total

171
55
429
298

133
43
348
—
234

17
11
416
97

21
11
459
—
109

7
—
5
8

19
—
4
—
20

15
—
14
17

12
1
22
—
16

210
66
864
420

185
55
833
—
379

—
—
—
—

—
—
—
18
18

131
40
314
—
223

20
11
425
—
102

3
—
—
—
3

12
—
28
—
17

166
51
767
—
345

—
—
—
48
48

210
66
864
420

185
55
833
18
397

166
51
767
48
393

(a) 

Total sales volumes (mboed)
The amounts correspond with the basis for fiscal settlements with governments, representing equity tanker liftings and direct deliveries of liquid 
hydrocarbons.
Includes natural gas acquired for injection and subsequent resale.

(b) 
(c)  Upgraded bitumen excluding blendstocks.

Average Production Cost per Unit(a)

Africa

  U.S. 

E.G.  

Libya

(Dollars per boe)
2018
2017
2016
(a) 

$

$

8.68
9.23
11.02
Production, severance and property taxes are excluded; however, shipping and handling as well as other operating expenses are included in the production 
costs used in this calculation.  See Item 8. Financial Statements and Supplementary Data – Supplementary Information on Oil and Gas Producing 
Activities - Results of Operations for Oil and Gas Production Activities for more information regarding production costs.

4.35
6.08
N.M.

8.68
7.90
8.41

1.91
2.12
2.17

9.83
9.49
9.84

29.72
29.36

— $

$

$

$

Other Int'l
30.02
$
26.61
23.13

Cont Ops

Disc Ops

Total

N.M.   Not meaningful information due to limited sales. 

10

 
 
  
 
 
Average Sales Price per Unit(a)

(Dollars per unit)
2018
Crude and condensate (bbl)
Natural gas liquids (bbl)
Natural gas (mcf)
2017
Crude and condensate (bbl)
Natural gas liquids (bbl)
Natural gas (mcf)
Synthetic crude oil (bbl)
2016
Crude and condensate (bbl)
Natural gas liquids (bbl)
Natural gas (mcf)
Synthetic crude oil (bbl)
(a) 

(b) 

Africa

  U.S. 

E.G.  

Libya

Total    

$ 63.11
24.54
2.65

$ 49.35
20.55
2.84
—

$ 55.28
1.00
0.24

$ 46.02
1.00
0.24
—

(b)

(b)

(b)

(b)

$ 73.75
—
4.57

$ 60.72
—
5.03
—

$ 60.65
1.00
0.30

$ 53.11
1.00
0.28
—

Other
Int'l

$ 70.39
41.66
8.03

$ 52.66
39.65
6.28
—

Disc
Ops

$ —
—
—

$ —
—
—
47.39

Total

$ 63.32
20.85
1.58

$ 50.38
16.65
1.51
47.39

$ 38.85
1.00
0.24
—
Excludes gains or losses on commodity derivative instruments.
Primarily represents fixed prices under long-term contracts with Alba Plant LLC, AMPCO and/or EGHoldings, which are equity method investees. We 
include our share of income from each of these equity method investees in our International Segment.

$ 43.21
26.41
4.80
—

$ 40.95
1.00
0.24
—

$ 57.69
—
—
—

$ —
—
—
37.57

$ 38.57
13.15
2.38
—

$ 39.23
10.68
1.26
37.57

(b)

(b)

Marketing 

Our reportable operating segments include activities related to the marketing and transportation of substantially all of our 
crude oil and condensate, NGLs and natural gas.  These activities include the transportation of production to market centers, the 
sale of commodities to third parties and the storage of production.  We balance our various sales, storage and transportation 
positions in order to aggregate volumes to satisfy transportation commitments and to achieve flexibility within product types 
and delivery points.  Such activities can include the purchase of commodities from third parties for resale.

Gross Delivery Commitments

We have committed to deliver gross quantities of crude oil and condensate, NGLs and natural gas to customers under a 
variety of contracts.  As of December 31, 2018, the contracts for fixed and determinable quantities were at variable, market-
based pricing and related primarily to the following commitments:

Eagle Ford

Crude and condensate (mbbld)

Natural gas liquids (mbbld)

Natural gas (mmcfd)

Bakken

Crude and condensate (mbbld)
Natural gas (mmcfd)
Northern Delaware

Crude and condensate (mbbld)

2019

2020

2021

Thereafter

Commitment
Period Through

65

1

120

10
3

21

51

—

120

10
3

19

—

—

56

10
3

—

—

—

36

5 - 10
3 - 25

—

2020

2020

2022

2027
2028

2020

All of these contracts provide the options of delivering third-party volumes or paying a monetary shortfall penalty if 

production is inadequate to satisfy our commitment.  In addition to the contracts discussed above, we have entered into 
numerous agreements for transportation and processing of our equity production.  Some of these contracts have volumetric 
requirements which could require monetary shortfall penalties if our production is inadequate to meet the terms.

11

 
 
Competition 

Competition exists in all sectors of the oil and gas industry and we compete with major integrated and independent oil and 

gas companies, as well as national oil companies. We compete, in particular, in the exploration for and development of new 
reserves, acquisition of oil and natural gas leases and other properties, the marketing and delivery of our production into 
worldwide commodity markets and for the labor and equipment required for exploration and development of those properties.  
Principal methods of competing include geological, geophysical, and engineering research and technology, experience and 
expertise, economic analysis in connection with portfolio management, and safely operating oil and gas producing properties. 
See Item 1A. Risk Factors for discussion of specific areas in which we compete and related risks.

Environmental, Health and Safety Matters

The Health, Environmental, Safety and Corporate Responsibility Committee of our Board of Directors is responsible for 

overseeing our position on public issues, including environmental, health and safety matters.  Our Corporate Health, 
Environment, Safety and Security organization has the responsibility to ensure that our operating organizations maintain 
environmental compliance systems that support and foster our compliance with applicable laws and regulations.  Committees 
comprised of certain of our officers review our overall performance associated with various environmental compliance 
programs.  We also have a Corporate Emergency Response Team which oversees our response to any major environmental or 
other emergency incident involving us or any of our properties. 

Our businesses are subject to numerous laws and regulations relating to the protection of the environment, health and 

safety at the national, state and local levels. These laws and their implementing regulations and other similar state and local 
laws and rules can impose certain operational controls for minimization of pollution or recordkeeping, monitoring and reporting 
requirements or other operational or siting constraints on our business, result in costs to remediate releases of regulated 
substances, including crude oil, into the environment, or require costs to remediate sites to which we sent regulated substances 
for disposal.  In some cases, these laws can impose strict liability for the entire cost of clean-up on any responsible party 
without regard to negligence or fault and impose liability on us for the conduct of others (such as prior owners or operators of 
our assets) or conditions others have caused, or for our acts that complied with all applicable requirements when we performed 
them.  We have incurred and will continue to incur capital, operating and maintenance, and remediation expenditures as a result 
of environmental laws and regulations. 

New laws have been enacted and regulations are being adopted by various regulatory agencies on a continuing basis and 
the costs of compliance with these new laws and regulations can only be broadly appraised until their implementation becomes 
more defined.

For a discussion of environmental capital expenditures and costs of compliance for air, water, solid waste and remediation, 
see Item 3. Legal Proceedings and Item 7. Management’s Discussion and Analysis of Financial Condition and Results of 
Operations – Management’s Discussion and Analysis of Environmental Matters, Litigation and Contingencies.

Air and Climate Change

Environmental advocacy groups and regulatory agencies in the United States and other countries have focused 
considerable attention on the emissions of carbon dioxide, methane and other greenhouse gases and their potential role in 
climate change. Developments in greenhouse gas initiatives may affect us and other similarly situated companies operating in 
the oil and gas industry.  As part of our commitment to environmental stewardship, we estimate and publicly report greenhouse 
gas emissions from our operations.  We are working to continuously improve the accuracy and completeness of these estimates.  
In addition, we continuously strive to improve operational and energy efficiencies through resource and energy conservation 
where practicable and cost effective.

Government entities and other groups have filed lawsuits in several states and other jurisdictions seeking to hold a wide 

variety of companies that produce fossil fuels liable for the alleged impacts of the greenhouse gas emissions attributable to 
those fuels.  The lawsuits allege damages as a result of global warming and the plaintiffs are seeking unspecified damages and 
abatement under various tort theories.  Marathon Oil has been named as a defendant in several of these lawsuits, along with 
numerous other companies.  Similar lawsuits may be filed in other jurisdictions.  While the ultimate outcome and impact to us 
cannot be predicted with certainty, we believe that the claims made against us are without merit and will not have a material 
adverse effect on our consolidated financial position, results of operations or cash flow.

The EPA finalized a more stringent National Ambient Air Quality Standard (“NAAQS”) for ozone in October 2015.  States 

that contain any areas designated as non-attainment, and any tribes that choose to do so, will be required to complete 
development of implementation plans in the 2020-2021 time frame.  The EPA may in the future designate additional areas as 
non-attainment, including areas in which we operate, which may result in an increase in costs for emission controls and 
requirements for additional monitoring and testing, as well as a more cumbersome permitting process.  Although there may be 

12

an adverse financial impact (including compliance costs, potential permitting delays and increased regulatory requirements) 
associated with this revised regulation, the extent and magnitude of that impact cannot be reliably or accurately estimated due 
to the present uncertainty regarding any additional measures and how they will be implemented.  The EPA's final rule has been 
judicially challenged by both industry and other interested parties, and the outcome of this litigation may also impact 
implementation and revisions to the rule.

In November 2016, the Bureau of Land Management (“BLM”) issued a final rule to further restrict venting and/or flaring 
of gas from facilities subject to BLM jurisdiction, and to modify certain royalty requirements.  BLM issued a two-year stay of 
these requirements in December 2017.  In September 2018, BLM published a final rule to rescind substantial portions of the 
rule.  The rescission was challenged by multiple parties in the U.S. District Court for the Northern District of California.  If the 
judicial challenges to the rule are successful and the rule were to come back into effect, the requirements would result in 
additional costs of compliance as well as increased monitoring, recordkeeping and recording for some of our facilities.

Hydraulic Fracturing

Hydraulic fracturing is a commonly used process that involves injecting water, sand and small volumes of chemicals into 

the wellbore to fracture the hydrocarbon-bearing rock thousands of feet below the surface to facilitate higher flow of 
hydrocarbons into the wellbore. Our business uses this technique extensively throughout our operations.  Hydraulic fracturing 
has been regulated at the state and local level through permitting and compliance requirements. Various state and local-level 
initiatives in regions with substantial shale resources have been or may be proposed or implemented to further regulate 
hydraulic fracturing practices, limit water withdrawals and water use, require disclosure of fracturing fluid constituents, restrict 
which additives may be used, or implement temporary or permanent bans on hydraulic fracturing. 

Water

In 2014, the EPA and the U.S. Army Corps of Engineers published proposed regulations which expand the surface waters 

that are regulated under the federal Clean Water Act (“CWA”) and its various programs.  While these regulations were finalized 
largely as proposed in 2015, the rule has been stayed by the courts pending a substantive decision on the merits.  In December 
2018, EPA and the Army Corps of Engineers issued a proposed rule that, if finalized, would amend the 2015 regulations to 
narrow the scope of federal CWA jurisdiction. If the new proposed rule is not finalized and the 2015 rule is ultimately 
implemented, the expansion of CWA jurisdiction will result in additional costs of compliance as well as increased monitoring, 
recordkeeping and recording for some of our facilities.

For additional information, see Item 1A. Risk Factors.

Concentrations of Credit Risk

We are exposed to credit risk in the event of nonpayment by counterparties, a significant portion of which are concentrated 

in energy-related industries.  The creditworthiness of customers and other counterparties is subject to continuing review, 
including the use of master netting agreements, where appropriate. In 2018, sales to Valero Marketing and Supply and Flint 
Hills Resources and each of their respective affiliates, each accounted for approximately 11% of our total revenues. In 2017, 
sales to Vitol and each of their respective affiliates accounted for approximately 10% of our total revenues.  In 2016, sales to 
Valero Marketing and Supply, Tesoro Petroleum, and Flint Hills Resources and each of their respective affiliates accounted for 
approximately 13%, 11% and 10% of our total revenues. 

Trademarks, Patents and Licenses

We currently hold U.S. and foreign patents.  Although in the aggregate our trademarks and patents are important to us, we 
do not regard any single trademark, patent, or group of related trademarks or patents as critical or essential to our business as a 
whole.

Employees

We had approximately 2,400 active, full-time employees as of December 31, 2018. 

13

 
Executive Officers of the Registrant

The executive officers of Marathon Oil and their ages as of February 1, 2019, are as follows:

Lee M. Tillman
Dane E. Whitehead
T. Mitch Little
Reginald D. Hedgebeth
Patrick J. Wagner

Gary E. Wilson

57
57
55
51
54

57

Chairman, President and Chief Executive Officer
Executive Vice President and Chief Financial Officer
Executive Vice President—Operations
Senior Vice President, General Counsel and Secretary
Executive Vice President—Corporate Development and Strategy

Vice President, Controller and Chief Accounting Officer

Mr. Tillman was appointed by the board of directors as chairman of the board effective February 1, 2019.  In August 2013 

he was appointed as president and chief executive officer.  Prior to this appointment, Mr. Tillman served as vice president of 
engineering for ExxonMobil Development Company (a project design and execution company), where he was responsible for 
all global engineering staff engaged in major project concept selection, front-end design and engineering.  Between 2007 and 
2010, Mr. Tillman served as North Sea production manager and lead country manager for subsidiaries of ExxonMobil in 
Stavanger, Norway.  Mr. Tillman began his career in the oil and gas industry at Exxon Corporation in 1989 as a research 
engineer and has extensive operations management and leadership experience.  

Mr. Whitehead was appointed executive vice president and chief financial officer in March 2017.  Prior to this 

appointment, Mr. Whitehead served as executive vice president and chief financial officer of both EP Energy Corp. and EP 
Energy LLC (oil and natural gas producer) since May 2012.  Between 2009 and 2012 Mr. Whitehead served as senior vice 
president of strategy and enterprise business development and a member of El Paso Corporation's executive committee.  He 
joined El Paso Exploration & Production Company as senior vice president and chief financial officer in 2006.  Before joining 
El Paso Mr. Whitehead was vice president, controller and chief accounting officer of Burlington Resources Inc. (oil and natural 
gas producer), and formerly senior vice president and CFO of Burlington Resources Canada.

Mr. Little was appointed executive vice president of operations in August 2016 after having served as vice president, 
conventional since December 2015, vice president international and offshore exploration and production operations since 
September 2013, and as vice president, international production operations since September 2012.  Prior to that, Mr. Little was 
resident manager of our Norway operations and served as general manager, worldwide drilling and completions. Mr. Little 
joined Marathon Oil in 1986 and has since held a number of engineering and management positions of increasing responsibility. 

Mr. Hedgebeth was appointed senior vice president, general counsel and secretary in April 2017.  Between 2009 and 2017 

Mr. Hedgebeth served as general counsel, corporate secretary and chief compliance officer for Spectra Energy Corp (oil and 
natural gas pipeline company) and general counsel for Spectra Energy Partners, LP.  Before joining Spectra Energy Mr. 
Hedgebeth served as senior vice president, general counsel and secretary with Circuit City Stores, Inc. (consumer electronics 
retail company), and vice president of legal for The Home Depot, Inc. (home improvement retail company). 

Mr. Wagner was appointed executive vice president of corporate development and strategy in November 2017 after having 

served as senior vice president of corporate development and strategy since March 2017, vice president of corporate 
development and interim chief financial officer since August 2016 and vice president of corporate development since April 
2014. Prior to this appointment, he served as senior vice president, western business unit, for QR Energy LP (an oil and natural 
gas producer) and the affiliated Quantum Resources Management, which he joined in early 2012 as vice president, exploration. 
Prior to that, Mr. Wagner was managing director in Houston for Scotia Waterous, the oil and gas arm of Scotiabank (an 
international banking services provider), from 2010 to 2012. Before joining Scotia, Mr. Wagner was vice president, Gulf of 
Mexico, for Devon Energy Corp. (an oil and natural gas producer), having joined Devon in 2003 as manager, international 
exploitation.

Mr. Wilson was appointed vice president, controller and chief accounting officer in October 2014. Prior to joining 

Marathon Oil, he served in various finance and accounting positions of increasing responsibility at Noble Energy, Inc. (a global 
exploration and production company) since 2001, including as director corporate accounting from February 2014 through 
September 2014, director global operations services finance from October 2012 through February 2014, director controls and 
reporting from April 2011 through September 2012, and international finance manager from September 2009 through March 
2011.

14

Available Information

Our website is www.marathonoil.com. Our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q and Current 

Reports on Form 8-K and other reports and filings with the SEC are available free of charge on our website as soon as 
reasonably practicable after the reports are filed or furnished with the SEC.  Information contained on our website is not 
incorporated into this Annual Report on Form 10-K or our other securities filings. Our filings are also available in hard copy, 
free of charge, by contacting our Investor Relations office.  Additionally, the SEC maintains a website (www.sec.gov) that 
contains reports, proxy and information statements and other information regarding issuers that file electronically with the SEC. 

Additionally, we make available free of charge on our website:

• 

• 

• 

our Code of Business Conduct and Code of Ethics for Senior Financial Officers; 

our Corporate Governance Principles; and 

the charters of our Audit and Finance Committee, Compensation Committee, Corporate Governance and Nominating 
Committee and Health, Environmental, Safety and Corporate Responsibility Committee.

Item 1A. Risk Factors

We are subject to various risks and uncertainties in the course of our business.  The following summarizes significant risks 

and uncertainties that may adversely affect our business, financial condition or results of operations.  When considering an 
investment in our securities, you should carefully consider the risk factors included below as well as those matters referenced in 
the foregoing pages under "Disclosures Regarding Forward-Looking Statements" and other information included and 
incorporated by reference into this Annual Report on Form 10-K.

A substantial decline in crude oil and condensate, NGLs and natural gas prices would reduce our operating results and cash 
flows and could adversely impact our future rate of growth and the carrying value of our assets.

The markets for crude oil and condensate, NGLs and natural gas have been volatile and are likely to continue to be volatile 
in the future, causing prices to fluctuate widely.  Our revenues, operating results and future rate of growth are highly dependent 
on the prices we receive for our crude oil and condensate, NGLs and natural gas.  Many of the factors influencing prices of 
crude oil and condensate, NGLs and natural gas are beyond our control.  These factors include:

•  worldwide and domestic supplies of and demand for crude oil and condensate, NGLs and natural gas;

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

• 

the cost of exploring for, developing and producing crude oil and condensate, NGLs and natural gas;

the ability of the members of OPEC and certain non-OPEC members, such as Russia, to agree to and maintain production 
controls;

the production levels of non-OPEC countries, including production levels in the shale plays in the United States;

the level of drilling, completion and production activities by other exploration and production companies, and variability 
therein, in response to market conditions;

political instability or armed conflict in oil and natural gas producing regions;

changes in weather patterns and climate;

natural disasters such as hurricanes and tornadoes;

the price and availability of alternative and competing forms of energy;

the effect of conservation efforts;

epidemics or pandemics;

technological advances affecting energy consumption and energy supply;

domestic and foreign governmental regulations and taxes; and

general economic conditions worldwide.

The long-term effects of these and other factors on the prices of crude oil and condensate, NGLs and natural gas are 

uncertain.  Historical declines in commodity prices have adversely affected our business by:

• 

• 

• 

reducing the amount of crude oil and condensate, NGLs and natural gas that we can produce economically;

reducing our revenues, operating income and cash flows;

causing us to reduce our capital expenditures, and delay or postpone some of our capital projects; 

15

• 

• 

requiring us to impair the carrying value of our assets; 

reducing the standardized measure of discounted future net cash flows relating to crude oil and condensate, NGLs and 
natural gas; and

• 

increasing the costs of obtaining capital, such as equity and short- and long-term debt.

Estimates of crude oil and condensate, NGLs and natural gas reserves depend on many factors and assumptions, including 
various assumptions that are based on conditions in existence as of the dates of the estimates.  Any material changes in 
those conditions or other factors affecting those assumptions could impair the quantity and value of our reserves.

The proved reserve information included in this Annual Report on Form 10-K has been derived from engineering and 
geoscience estimates. Estimates of crude oil and condensate, NGLs, natural gas and our historical synthetic crude oil reserves 
were prepared, in accordance with SEC regulations, by our in-house teams of reservoir engineers and geoscience professionals 
and were reviewed and approved by our Corporate Reserves Group and third-party consultants.  Reserves were valued based on 
SEC pricing for the periods ended December 31, 2018, 2017 and 2016, as well as other conditions in existence at those dates.  
The table below provides the 2018 SEC pricing for certain benchmark prices:

WTI Crude oil (per bbl)

Henry Hub natural gas (per mmbtu)

Brent crude oil (per bbl)

Mont Belvieu NGLs (per bbl)

2018 SEC Pricing 

$

$

$

$

65.56

3.05

72.70

26.63

 If annual SEC crude oil benchmark prices (see table above) were to decrease to approximately $45 per bbl, or 30% below 

average prices used to estimate 2018 proved reserves, we would not expect price related reserve revisions to have a material 
impact on proved reserve volumes.  Future reserve revisions could also result from changes in capital funding, drilling plans 
and governmental regulation, among other things. 

Reserve estimation is a subjective process that involves estimating volumes to be recovered from underground 

accumulations of crude oil and condensate, NGLs and natural gas that cannot be directly measured.  Estimates of economically 
producible reserves and of future net cash flows depend on a number of variable factors and assumptions, including:

• 

• 

• 

• 

• 

location, size and shape of the accumulation as well as fluid, rock and producing characteristics of the accumulation;

historical production from the area, compared with production from other analogous producing areas;

the assumed impacts of regulation by governmental agencies;

assumptions concerning future operating costs, taxes, development costs and workover and repair costs; and

industry economic conditions, levels of cash flows from operations and other operating considerations.

As a result, different petroleum engineers and geoscientists, each using industry-accepted geologic and engineering 
practices and scientific methods, may produce different estimates of proved reserves and future net cash flows based on the 
same available data.  Because of the subjective nature of such reserve estimates, each of the following items may differ 
materially from the estimated amounts:

• 

• 

• 

the amount and timing of production;

the revenues and costs associated with that production; and

the amount and timing of future development expenditures.

16

If we are unsuccessful in acquiring or finding additional reserves, our future crude oil and condensate, NGLs and natural 
gas production would decline, thereby reducing our cash flows and results of operations and impairing our financial 
condition.

The rate of production from crude oil and condensate, NGLs and natural gas properties generally declines as reserves are 

depleted.  Except to the extent we acquire interests in additional properties containing proved reserves, conduct successful 
exploration and development activities or, through engineering studies, optimize production performance or identify additional 
reservoirs not currently producing or secondary recovery reserves, our proved reserves will decline materially as crude oil and 
condensate, NGLs and natural gas are produced.  Accordingly, to the extent we are not successful in replacing the crude oil and 
condensate, NGLs and natural gas we produce, our future revenues will decline.  Creating and maintaining an inventory of 
prospects for future production depends on many factors, including:

• 

• 

• 

• 

• 

obtaining rights to explore for, develop and produce crude oil and condensate, NGLs and natural gas in promising areas;

drilling success;

the ability to complete projects timely and cost effectively;

the ability to find or acquire additional proved reserves at acceptable costs; and

the ability to fund such activity.

Future exploration and drilling results are uncertain and involve substantial costs.

Drilling for crude oil and condensate, NGLs and natural gas involves numerous risks, including the risk that we may not 
encounter commercially productive reservoirs.  The costs of drilling, completing and operating wells are often uncertain, and 
drilling operations may be curtailed, delayed or canceled as a result of a variety of factors, including:

• 

• 

• 

• 

• 

• 

• 

• 

unexpected drilling conditions;

title problems;

pressure or irregularities in formations;

equipment failures or accidents;

inflation in exploration and drilling costs;

fires, explosions, blowouts or surface cratering;

lack of, or disruption in, access to pipelines or other transportation methods; and

shortages or delays in the availability of services or delivery of equipment.

If crude oil and condensate, NGLs and natural gas prices decrease, it could adversely affect the abilities of our 
counterparties to perform their obligations to us, including abandonment obligations, which could negatively impact our 
financial results. 

We often enter into arrangements to conduct certain business operations, such as oil and gas exploration and production, or 

transportation of crude oil and condensate, NGLs and natural gas, with partners, co-working interest owners, and other 
counterparties in order to share risks associated with those operations. In addition, we market our products to a variety of 
purchasers. If commodity prices decrease, some of our counterparties may experience liquidity problems and may not be able to 
meet their financial and other obligations, including abandonment obligations, to us. The inability of our joint venture partners 
or co-working interest owners to fund their portion of the costs under our joint venture agreements and joint operating 
agreements, or the nonperformance by purchasers, contractors or other counterparties of their obligations to us, could 
negatively impact our operating results and cash flows.

If we are unable to complete capital projects at their expected costs and in a timely manner, or if the market conditions 
assumed in our project economics deteriorate, our business, financial condition, results of operations and cash flows could 
be materially and adversely affected.

Delays or cost increases related to capital spending programs involving drilling and completion activities, engineering, 
procurement and construction of facilities (including improvements and repairs to our existing facilities) could adversely affect 
our ability to achieve forecasted internal rates of return and operating results.  Delays in making required changes or upgrades 
to our facilities could subject us to fines or penalties as well as affect our ability to supply certain products we produce.  Such 
delays or cost increases may arise as a result of unpredictable factors, many of which are beyond our control, including:

• 

denial of or delay in receiving requisite regulatory approvals and/or permits;

17

• 

• 

• 

• 

unplanned increases in the cost of construction materials or labor;

disruptions in transportation of components or construction materials;

increased costs or operational delays resulting from shortages of water; 

adverse weather conditions, natural disasters or other events (such as equipment malfunctions, explosions, fires or spills) 
affecting our facilities, or those of vendors or suppliers;

• 

shortages of sufficiently skilled labor, or labor disagreements resulting in unplanned work stoppages;

•  market-related increases in a project’s debt or equity financing costs; and

• 

nonperformance by, or disputes with, vendors, suppliers, contractors or subcontractors.

Any one or more of these factors could have a significant impact on our capital projects.

Our offshore operations involve special risks that could negatively impact us.

Offshore operations present technological challenges and operating risks because of the marine environment.  Activities in 

offshore operations may pose risks because of the physical distance to oilfield service infrastructure and service providers.  
Environmental remediation and other costs resulting from spills or releases may result in substantial liabilities.

We may incur substantial capital expenditures and operating costs as a result of compliance with and changes in 
environmental, health, safety and security laws and regulations, and, as a result, our business, financial condition, results of 
operations and cash flows could be materially and adversely affected.

Our businesses are subject to numerous laws, regulations and other requirements relating to the protection of the 

environment, including those relating to the discharge of materials into the environment such as the flaring of natural gas, waste 
management, pollution prevention, greenhouse gas emissions and the protection of endangered species as well as laws, 
regulations, and other requirements relating to public and employee safety and health and to facility security.  We have incurred 
and may continue to incur capital, operating and maintenance, and remediation expenditures as a result of these laws, 
regulations, and other requirements.  To the extent these expenditures, as with all costs, are not ultimately reflected in the prices 
of our products, our operating results will be adversely affected.  The specific impact of these laws, regulations, and other 
requirements may vary depending on a number of factors, including the age and location of operating facilities and production 
processes.  We may also be required to make material expenditures to modify operations, install pollution control equipment, 
perform site clean-ups or curtail operations that could materially and adversely affect our business, financial condition, results 
of operations and cash flows.  We may become subject to liabilities that we currently do not anticipate in connection with new, 
amended or more stringent requirements, stricter interpretations of existing requirements or the future discovery of 
contamination.  In addition, any failure by us to comply with existing or future laws, regulations, and other requirements could 
result in civil penalties or criminal fines and other enforcement actions against us. 

We believe it is likely that the scientific and political attention to issues concerning the extent, causes of and responsibility 

for climate change will continue, with the potential for further regulations that could affect our operations.  Our operations 
result in greenhouse gas emissions. Currently, various legislative or regulatory measures to address greenhouse gas emissions 
(including carbon dioxide, methane and nitrous oxides) are in various phases of review, discussion or implementation in 
countries where we operate, including the U.S. and the European Union.  Internationally, the United Nations Framework 
Convention on Climate Change finalized an agreement among 195 nations at the 21st Conference of the Parties in Paris with an 
overarching goal of preventing global temperatures from rising more than 2 degrees Celsius. The agreement includes provisions 
that every country take some action to lower emissions, but there is no legal requirement for how or by what amount emissions 
should be lowered. The EPA has also finalized regulations targeting new sources of methane emissions from the oil and gas 
industry. Finalization of new legislation, regulations or international agreements in the future could result in increased costs to 
operate and maintain our facilities, capital expenditures to install new emission controls at our facilities, and costs to administer 
and manage any potential greenhouse gas emissions or carbon trading or tax programs.  These costs and capital expenditures 
could be material.  Although uncertain, these developments could increase our costs, reduce the demand for crude oil and 
condensate, NGLs and natural gas, and create delays in our obtaining air pollution permits for new or modified facilities. 

The potential adoption of federal, state and local legislative and regulatory initiatives related to hydraulic fracturing could 
result in increased compliance costs, operating restrictions or delays in the completion of oil and gas wells. 

Hydraulic fracturing is a commonly used process that involves injecting water, sand, and small volumes of chemicals into 

the wellbore to fracture the hydrocarbon-bearing rock thousands of feet below the surface to facilitate higher flow of 
hydrocarbons into the wellbore. Our business uses this technique extensively throughout our U.S. operations.  Hydraulic 
fracturing has been regulated at the state and local level through permitting and compliance requirements.  Various state and 
local-level initiatives in regions with substantial shale resources have been or may be proposed or implemented to further 

18

regulate hydraulic fracturing practices, limit water withdrawals and water use, require disclosure of fracturing fluid 
constituents, restrict which additives may be used, or implement temporary or permanent bans on hydraulic fracturing.  In 2015 
the BLM issued a rule governing certain hydraulic fracturing practices on lands within their jurisdiction; however, this rule was 
rescinded in December 2017.  This rescission is being judicially challenged before the U.S. District Court for the Northern 
District of California.

Increased regulation and attention given to the hydraulic fracturing process could lead to greater opposition, including 
litigation, to oil and gas activities using hydraulic fracturing techniques. Additional legislation or regulation could also lead to 
operational delays or increased operating costs in the production of crude oil and condensate, NGLs and natural gas, including 
from the shale plays, or could make it more difficult to perform hydraulic fracturing. The adoption of any federal, state or local 
laws or the implementation of regulations regarding hydraulic fracturing could potentially cause a decrease in the completion of 
new oil and gas wells and increased compliance costs which could increase costs of our operations and cause considerable 
delays in acquiring regulatory approvals to drill and complete wells.

The potential adoption of federal, state and local legislative and regulatory initiatives intended to address potential induced 
seismic activity in the areas in which we operate could result in increased compliance costs, operating restrictions or delays 
in the completion of oil and gas wells. 

State and federal regulatory agencies have focused on a possible connection between the operation of injection wells used 
for oil and gas waste disposal and seismic activity.  When caused by human activity, such events are called induced seismicity.  
Separate and apart from the referenced potential connection between injection wells and seismicity, concerns have been raised 
that hydraulic fracturing activities may be correlated to anomalous seismic events.  Marathon uses hydraulic fracturing 
techniques throughout its U.S. operations.  

While the scientific community and regulatory agencies at all levels are continuing to study the possible linkage between 

oil and gas activity and induced seismicity,  some state regulatory agencies have modified their regulations or guidance to 
mitigate potential causes of induced seismicity.  For example, Oklahoma has taken numerous regulatory actions in response to 
concerns related to the operation of produced water disposal wells and induced seismicity, and has issued guidelines to 
operators in certain areas of the State curtailing injection of produced water due to seismic concerns.  Marathon does not 
currently own or operate injection wells or contract for such services in these areas.  Further, Oklahoma issued guidelines to 
operators for management of anomalous seismicity that may be related to hydraulic fracturing activities in the SCOOP/STACK 
area.  In addition, a number of lawsuits have been filed in Oklahoma alleging damage from seismicity relating to disposal well 
operations.  Marathon has not been named in any of those lawsuits.

Increased seismicity in Oklahoma or other areas could result in additional regulation and restrictions on our operations and 

could lead to operational delays or increased operating costs.  Additional regulation and attention given to induced seismicity 
could also lead to greater opposition, including litigation, to oil and gas activities.

Our business could be negatively impacted by cyberattacks targeting our computer and telecommunications systems and 
infrastructure, or targeting those of our third-party service providers. 

Our business, like other companies in the oil and gas industry, has become increasingly dependent on digital technologies, 

including technologies that are managed by third-party service providers on whom we rely to help us collect, host or process 
information. Such technologies are integrated into our business operations and used as a part of our production and distribution 
systems in the U.S. and abroad, including those systems used to transport production to market, to enable communications, and 
to provide a host of other support services for our business.  Use of the internet and other public networks for communications, 
services, and storage, including "cloud" computing, exposes all users (including our business) to cybersecurity risks.  

While we and our third-party service providers commit resources to the design, implementation, and monitoring of our 
information systems, there is no guarantee that our security measures will provide absolute security.  Despite these security 
measures, we may not be able to anticipate, detect, or prevent cyberattacks, particularly because the methodologies used by 
attackers change frequently or may not be recognized until launched, and because attackers are increasingly using techniques 
designed to circumvent controls and avoid detection.  We and our third-party service providers may therefore be vulnerable to 
security events that are beyond our control, and we may be the target of cyber-attacks, as well as physical attacks, which could 
result in information security breaches and significant disruption to our business.  Our information systems and related 
infrastructure have experienced attempted and actual minor breaches of our cybersecurity in the past, but we have not suffered 
any losses or breaches which had a material effect on our business, operations or reputation relating to such attacks; however, 
there is no assurance that we will not suffer such losses or breaches in the future.  

As cyberattacks continue to evolve, we may be required to expend significant additional resources to respond to 
cyberattacks, to continue to modify or enhance our protective measures, or to investigate and remediate any information 

19

 
 
systems and related infrastructure security vulnerabilities.  We may also be subject to regulatory investigations or litigation 
relating from cybersecurity issues.

Our level of indebtedness may limit our liquidity and financial flexibility. 

As of December 31, 2018, our total debt was $5.5 billion, with our next debt maturity in the amount of $600 million due in 

2020.  Our indebtedness could have important consequences to our business, including, but not limited to, the following:

•  we may be more vulnerable to general adverse economic and industry conditions;

• 

• 

• 

a portion of our cash flows from operating activities must be used to service our indebtedness and is not available for 
other purposes;

our flexibility in planning for, or reacting to, changes in our industry may be limited;

a financial covenant in our Credit Agreement stipulates that our total debt to capitalization ratio will not exceed 65% as 
of the last day of any fiscal quarter, and if exceeded, may make additional borrowings more expensive and affect our 
ability to plan for and react to changes in the economy and our industry;

•  we may be at a competitive disadvantage as compared to similar companies that have less debt; and

• 

additional financing in the future for working capital, capital expenditures, acquisitions or development activities, 
general corporate or other purposes may have higher costs and more restrictive covenants.

We may incur additional debt in order to fund our capital expenditures, acquisitions or development activities, or for 

general corporate or other purposes. A higher level of indebtedness increases the risk that our financial flexibility may 
deteriorate. Our ability to meet our debt obligations and service our debt depends on future performance. General economic 
conditions, crude oil and condensate, NGLs and natural gas prices, and financial, business and other factors will affect our 
operations and our future performance. Many of these factors are beyond our control and we may not be able to generate 
sufficient cash flow to pay the interest on our debt, and future working capital, borrowings and equity financing may not be 
available to pay or refinance such debt. See Item 8. Financial Statements and Supplementary Data – Note 16 to the consolidated 
financial statements for a discussion of debt obligations. 

A downgrade in our credit rating could negatively impact our cost of and ability to access capital, which could adversely 
affect our business. 

We receive debt ratings from the major credit rating agencies in the United States.  Due to the volatility in crude oil and 
U.S. natural gas prices in recent years, credit rating agencies review companies in the energy industry periodically, including us.  
At December 31, 2018, our corporate credit ratings were: Standard & Poor's Global Ratings Services BBB- (positive); Fitch 
Ratings BBB (stable); and Moody's Investor Services, Inc. Ba1 (positive).  The credit rating process is contingent upon a 
number of factors, many of which are beyond our control. A downgrade of our credit ratings could negatively impact our cost of 
capital and our ability to access the capital markets, increase the interest rate and fees we pay on our revolving credit facility, 
and may limit or reduce credit lines with our bank counterparties. We could also be required to post letters of credit or other 
forms of collateral for certain contractual obligations, which could increase our costs and decrease our liquidity or letter of 
credit capacity under our unsecured revolving credit facility. Limitations on our ability to access capital could adversely impact 
the level of our capital spending budget, our ability to manage our debt maturities, or our flexibility to react to changing 
economic and business conditions.

Our commodity price risk management activities may prevent us from fully benefiting from commodity price increases and 
may expose us to other risks, including counterparty risk.

Global commodity prices are volatile.  In order to mitigate commodity price volatility and increase the predictability of 
cash flows related to the marketing of our crude oil and natural gas, we, from time to time, enter into crude oil and natural gas 
hedging arrangements with respect to a portion of our expected production.  While hedging arrangements are intended to 
mitigate commodity price volatility, we may be prevented from fully realizing the benefits of price increases above the price 
levels of the derivative instruments used to manage price risk.  In addition, our hedging arrangements may expose us to the risk 
of financial loss in certain circumstances, including instances in which the counterparties to our hedging contracts fail to 
perform under the contracts.  See Item 7A. Quantitative and Qualitative Disclosures about Market Risk.

Worldwide political and economic developments and changes in law or policy could adversely affect our operations and 
materially reduce our profitability and cash flows.

Local political and economic factors in global markets could have a material adverse effect on us.  A total of  29% of our 
crude oil and condensate, NGLs and natural gas related to continuing operations in 2018 was derived from production outside 
the U.S. and 16% of our proved reserves of crude oil and condensate, NGLs and natural gas as of December 31, 2018 were 
located outside the U.S.  We are, therefore, subject to the political, geographic and economic risks and possible terrorist 

20

activities or other armed conflict attendant to doing business within or outside of the U.S.  There are many risks associated with 
operations in countries such as E.G., and the Kurdistan Region of Iraq including: 

• 

• 

• 

• 

changes in governmental policies relating to crude oil and condensate, NGLs or natural gas and taxation;

other political, economic or diplomatic developments and international monetary fluctuations;

political and economic instability, war, acts of terrorism, armed conflict and civil disturbances;

the possibility that a government may seize our property with or without compensation, may attempt to renegotiate or 
revoke existing contractual arrangements or may impose additional taxes or royalty burdens; and

• 

fluctuating currency values, hard currency shortages and currency controls.

Changes in the U.S. or global political and economic environment or any U.S. or global hostility or the occurrence or threat 

of future terrorist attacks, or other armed conflict, could adversely affect the economies of the U.S. and other developed 
countries.  A lower level of economic activity could result in a decline in energy consumption, which could cause our revenues 
and margins to decline and limit our future growth prospects.  These risks could lead to increased volatility in prices for crude 
oil and condensate, NGLs and natural gas.  In addition, these risks could increase instability in the financial and insurance 
markets and make it more difficult for us to access capital and to obtain the insurance coverage that we consider adequate.  
These risks could also cause damage to, or the inability to access production facilities or other operating assets and could limit 
our service and equipment providers from delivering items necessary for us to conduct our operations.

Actions of governments through tax legislation or interpretations of tax law, and other changes in law, executive order and 
commercial restrictions could reduce our operating profitability, both in the U.S. and abroad. The U.S. government can prevent 
or restrict us from doing business in foreign countries. These restrictions and those of foreign governments have in the past 
limited our ability to operate in, or gain access to, opportunities in various countries and will continue to do so in the future. 
Changes in law could also adversely affect our results, including new regulations resulting in higher costs to transport our 
production by pipeline, rail car, truck or vessel or the adoption of government payment transparency regulations that could 
require us to disclose competitively sensitive commercial information or that could cause us to violate the non-disclosure laws 
of other countries.

Our operations may be adversely affected by pipeline, rail and other transportation capacity constraints.

The marketability of our production depends in part on the availability, proximity, and capacity of pipeline facilities, rail 
cars, trucks and vessels. If any pipelines, rail cars, trucks or vessels become unavailable, we would, to the extent possible, be 
required to find a suitable alternative to transport our crude oil and condensate, NGLs and natural gas, which could increase the 
costs and/or reduce the revenues we might obtain from the sale of our production. Both the cost and availability of pipelines, 
rail cars, trucks, or vessels to transport our crude oil could be adversely impacted by new and expected state or federal 
regulations relating to transportation of crude oil.

If we acquire crude oil and natural gas properties, our failure to fully identify existing and potential problems, to accurately 
estimate reserves, production rates or costs, or to effectively integrate the acquired properties into our operations could 
materially and adversely affect our business, financial condition and results of operations.

We typically seek the acquisition of crude oil and natural gas properties and leases.  Although we perform reviews of 
properties to be acquired in a manner that we believe is diligent and consistent with industry practices, reviews of records and 
properties may not necessarily reveal existing or potential problems, nor may they permit us to become sufficiently familiar 
with the properties in order to fully assess possible deficiencies and potential problems.  Even when problems with a property 
are identified, we often assume environmental and other risks and liabilities in connection with acquired properties pursuant to 
the acquisition agreements.  Moreover, there are numerous uncertainties inherent in estimating quantities of crude oil and 
natural gas (as previously discussed), actual future production rates and associated costs with respect to acquired 
properties.  Actual reserves, production rates and costs may vary substantially from those assumed in our estimates.  In addition, 
an acquisition may have a material and adverse effect on our business and results of operations, particularly during the periods 
in which the operations of the acquired properties are being integrated into our ongoing operations or if we are unable to 
effectively integrate the acquired properties into our ongoing operations.

We operate in a highly competitive industry, and many of our competitors are larger and have available resources in excess 
of our own. 

The oil and gas industry is highly competitive, and many competitors, including major integrated and independent oil and 

gas companies, as well as national oil companies, are larger and have substantially greater resources at their disposal than we 
do.  We compete with these companies for the acquisition of oil and natural gas leases and other properties.  We also compete 
with these companies for equipment and personnel, including petroleum engineers, geologists, geophysicists and other 
specialists, required to develop and operate those properties and in the marketing of crude oil and condensate, NGLs and natural 

21

gas to end-users.  Such competition can significantly increase costs and affect the availability of resources, which could provide 
our larger competitors a competitive advantage when acquiring equipment, leases and other properties.  They may also be able 
to use their greater resources to attract and retain experienced personnel.  

Many of our major projects and operations are conducted jointly with other parties, which may decrease our ability to 
manage risk.

We often enter into arrangements to conduct certain business operations, such as oil and gas exploration and production 
with other parties in order to share risks associated with those operations.  However, these arrangements also may decrease our 
ability to manage risks and costs, particularly where we are not the operator.  We could have limited influence over and control 
of the behaviors and performance of these operations.  In addition, misconduct, fraud, noncompliance with applicable laws and 
regulations or improper activities by or on behalf of one or more of our partners or co-working interest owners could have a 
significant negative impact on our business and reputation.

Our operations are subject to business interruptions and casualty losses. We do not insure against all potential losses and 
therefore we could be seriously harmed by unexpected liabilities and increased costs.

Our United States and International operations are subject to unplanned occurrences, including blowouts, explosions, fires, 

loss of well control, spills, tornadoes, hurricanes and other adverse weather, tsunamis, earthquakes, volcanic eruptions or 
nuclear or other disasters, labor disputes and accidents. These same risks can be applied to the third-parties which transport our 
products from our facilities. A prolonged disruption in the ability of any pipelines, rail cars, trucks, or vessels to transport our 
production could contribute to a business interruption or increase costs.

Our operations are also subject to the additional hazards of pollution, releases of toxic gas and other environmental hazards 

and risks.  These hazards could result in serious personal injury or loss of human life, significant damage to property and 
equipment, environmental pollution, impairment of operations and substantial losses to us.  Various hazards have adversely 
affected us in the past, and damages resulting from a catastrophic occurrence in the future involving us or any of our assets or 
operations may result in our being named as a defendant in one or more lawsuits asserting potentially large claims or in our 
being assessed potentially substantial fines by governmental authorities.  We maintain insurance against many, but not all, 
potential losses or liabilities arising from operating hazards in amounts that we believe to be prudent.  Uninsured losses and 
liabilities arising from operating hazards could reduce the funds available to us for capital, exploration and investment spending 
and could have a material adverse effect on our business, financial condition, results of operations and cash flows.  Historically, 
we have maintained insurance coverage for physical damage including at times resulting business interruption to our major 
onshore and offshore facilities, with significant self-insured retentions.  In the future, we may not be able to maintain or obtain 
insurance of the type and amount we desire at reasonable rates.  As a result of market conditions, premiums and deductibles for 
our insurance policies will change over time and could escalate.  In some instances, certain insurance could become unavailable 
or available only for reduced amounts of coverage.  For example, due to historical hurricane activity, the availability of 
insurance coverage for windstorms has changed and, in some instances, it is uneconomical.  As a result, our exposure to losses 
from future windstorm activity has increased.

Litigation by private plaintiffs or government officials or entities could adversely affect our performance.

We currently are defending litigation and anticipate that we will be required to defend new litigation in the future.  The 

subject matter of such litigation may include releases of hazardous substances from our facilities, privacy laws, contract 
disputes, royalty disputes or any other laws or regulations that apply to our operations.  In some cases the plaintiff or plaintiffs 
seek alleged damages involving large classes of potential litigants, and may allege damages relating to extended periods of time 
or other alleged facts and circumstances.  If we are not able to successfully defend such claims, they may result in substantial 
liability.  We do not have insurance covering all of these potential liabilities.  In addition to substantial liability, litigation may 
also seek injunctive relief which could have an adverse effect on our future operations.

For instance, government entities and other groups have filed lawsuits in several states seeking to hold a wide variety of 
companies that produce fossil fuels liable for the alleged impacts of the greenhouse gas emissions attributable to those fuels. 
The lawsuits allege damages as a result of global warming and the plaintiffs are seeking unspecified damages and abatement 
under various tort theories. Marathon Oil has been named as a defendant in several of these lawsuits, along with numerous 
other companies.  Similar lawsuits may be filed in other jurisdictions.  The ultimate outcome and impact to us cannot be 
predicted with certainty, and we could incur substantial legal costs associated with defending these and similar lawsuits in the 
future.

In connection with our separation from MPC, MPC agreed to indemnify us for certain liabilities.  However, there can be no 
assurance that the indemnity will be sufficient to protect us against the full amount of such liabilities, or that MPC’s ability 
to satisfy its indemnification obligations will not be impaired in the future.

22

 
Pursuant to the Separation and Distribution Agreement and the Tax Sharing Agreement we entered into with MPC in 
connection with the spin-off, MPC agreed to indemnify us for certain liabilities.  However, third parties could seek to hold us 
responsible for any of the liabilities that MPC agreed to retain or assume, and there can be no assurance that the indemnification 
from MPC will be sufficient to protect us against the full amount of such liabilities, or that MPC will be able to fully satisfy its 
indemnification obligations.  In addition, even if we ultimately succeed in recovering from MPC any amounts for which we are 
held liable, we may be temporarily required to bear these losses ourselves.

The spin-off could result in substantial tax liability.

We obtained a private letter ruling from the IRS substantially to the effect that the distribution of shares of MPC common 
stock in the spin-off qualified as tax free to MPC, us and our stockholders for U.S. federal income tax purposes under Sections 
355 and 368 and related provisions of the U.S. Internal Revenue Code of 1986, as amended (the "Code").  If the factual 
assumptions or representations made in the request for the private letter ruling prove to have been inaccurate or incomplete in 
any material respect, then we will not be able to rely on the ruling.  Furthermore, the IRS does not rule on whether a distribution 
such as the spin-off satisfies certain requirements necessary to obtain tax-free treatment under Section 355 of the Code.  Rather, 
the private letter ruling was based on representations by us that those requirements were satisfied, and any inaccuracy in those 
representations could invalidate the ruling.  In connection with the spin-off, we also obtained an opinion of outside counsel, 
substantially to the effect that, the distribution of shares of MPC common stock in the spin-off qualified as tax free to MPC, us 
and our stockholders for U.S. federal income tax purposes under Sections 355 and 368 and related provisions of the Code.  The 
opinion relied on, among other things, the continuing validity of the private letter ruling and various assumptions and 
representations as to factual matters made by MPC and us which, if inaccurate or incomplete in any material respect, would 
jeopardize the conclusions reached by such counsel in its opinion.  The opinion is not binding on the IRS or the courts, and 
there can be no assurance that the IRS or the courts would not challenge the conclusions stated in the opinion or that any such 
challenge would not prevail.

If, notwithstanding receipt of the private letter ruling and opinion of counsel, the spin-off were determined not to qualify 

under Section 355 of the Code, each U.S. holder of our common stock who received shares of MPC common stock in the spin-
off would generally be treated as receiving a taxable distribution of property in an amount equal to the fair market value of the 
shares of MPC common stock received.  That distribution would be taxable to each such stockholder as a dividend to the extent 
of our accumulated earnings and profits as of the effective date of the spin-off.  For each such stockholder, any amount that 
exceeded those earnings and profits would be treated first as a non-taxable return of capital to the extent of such stockholder’s 
tax basis in its shares of our common stock with any remaining amount being taxed as a capital gain.  We would be subject to 
tax as if we had sold all the outstanding shares of MPC common stock in a taxable sale for their fair market value and would 
recognize taxable gain in an amount equal to the excess of the fair market value of such shares over our tax basis in such shares.

Under the terms of the Tax Sharing Agreement we entered into with MPC in connection with the spin-off, MPC is 
generally responsible for any taxes imposed on MPC or us and our subsidiaries in the event that the spin-off and/or certain 
related transactions were to fail to qualify for tax-free treatment as a result of actions taken, or breaches of representations and 
warranties made in the Tax Sharing Agreement, by MPC or any of its affiliates.  However, if the spin-off and/or certain related 
transactions were to fail to qualify for tax-free treatment because of actions or failures to act by us or any of our affiliates, we 
would be responsible for all such taxes.

We may issue preferred stock whose terms could dilute the voting power or reduce the value of Marathon Oil common stock.

Our restated certificate of incorporation authorizes us to issue, without the approval of our stockholders, one or more 
classes or series of preferred stock having such preferences, powers and relative, participating, optional and other rights, 
including preferences over Marathon Oil common stock respecting dividends and distributions, as our Board of Directors 
generally may determine.  The terms of one or more classes or series of preferred stock could dilute the voting power or reduce 
the value of Marathon Oil common stock.  For example, we could grant holders of preferred stock the right to elect some 
number of our directors in all events or on the happening of specified events or the right to veto specified transactions.  
Similarly, the repurchase or redemption rights or liquidation preferences we could assign to holders of preferred stock could 
affect the residual value of the common stock.

Item 1B. Unresolved Staff Comments

None.

Item 2. Properties

The location and general character of our principal crude oil and condensate, NGLs and natural gas properties and 

facilities, and other important physical properties have been described by segment under Item 1. Business. 

23

Estimated net proved crude oil and condensate, NGLs and natural gas reserves and the basis for estimating these reserves 

are set forth in Item 8. Financial Statements and Supplementary Data – Supplementary Information on Oil and Gas 
Producing Activities. 

Item 3. Legal Proceedings

We are a defendant in a number of legal and administrative proceedings arising in the ordinary course of business, 
including, but not limited to, royalty claims, contract claims, tax disputes and environmental claims. While the ultimate 
outcome and impact to us cannot be predicted with certainty, we believe the resolution of these proceedings will not have a 
material adverse effect on our consolidated financial position, results of operations or cash flows. 

See Item 8. Financial Statements and Supplementary Data – Note 25 to the consolidated financial statements for a 

description of such legal and administrative proceedings.

Environmental Proceedings

The following is a summary of certain proceedings involving us that were pending or contemplated as of December 31, 

2018, under federal and state environmental laws. 

Government entities have filed lawsuits in several states seeking to hold a wide variety of companies that produce fossil 
fuels liable for the alleged impacts of the greenhouse gas emissions attributable to those fuels. The lawsuits allege damages as a 
result of global warming and the plaintiffs are seeking unspecified damages and abatement under various tort theories. 
Marathon Oil has been named as a defendant in several of these lawsuits, along with numerous other companies.  Similar 
lawsuits may be filed in other jurisdictions.  While the ultimate outcome and impact to us cannot be predicted with certainty, we 
believe that the claims made against us are without merit and will not have a material adverse effect on our consolidated 
financial position, results of operations or cash flow.

As of December 31, 2018, we have sites across the country where remediation is being sought under environmental 
statutes, both federal and state, or where private parties are seeking remediation through discussions or litigation.  Based on 
currently available information the accrued amount to address the clean-up and remediation costs connected with these sites is 
not material.

If our assumptions relating to these costs prove to be inaccurate, future expenditures may exceed our accrued amounts. 

Item 4. Mine Safety Disclosures

Not applicable.

24

PART II

Item 5.   Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of 
Equity Securities 

The principal market on which Marathon Oil common stock is traded is the New York Stock Exchange ("NYSE"), and is 
traded under the trading symbol 'MRO'.  As of January 31, 2019, there were 29,960 registered holders of Marathon Oil common 
stock.

Dividends – Our Board of Directors intends to declare and pay dividends on Marathon Oil common stock based on our 
financial condition and results of operations, although it has no obligation under Delaware law or the Restated Certificate of 
Incorporation to do so.  In determining our dividend policy, the Board will rely on our consolidated financial statements.  
Dividends on Marathon Oil common stock are limited to our legally available funds.

The following table provides information about purchases by Marathon Oil and its affiliated purchaser, during the quarter 

ended December 31, 2018, of equity securities that are registered by Marathon Oil pursuant to Section 12 of the Securities 
Exchange Act of 1934:

Period
10/01/18 – 10/31/18

11/01/18 – 11/30/18

12/01/18 – 12/31/18

Total

Total Number of
Shares
Purchased(a)

Average
Price Paid
per Share

7,151,077

6,260,834

6,593,370

20,005,281

$

$

$

$

21.52

16.74

15.78

18.13

Total Number of
Shares Purchased
as Part of 
Publicly
Announced Plans
or Programs(b)

7,110,719

6,256,479

6,592,195

19,959,393

Approximate
Dollar Value of
Shares that May
Yet Be 
Purchased
Under the Plans
or Programs(b)
1,009,043,095

$

$

$

904,286,215

800,286,037

(a) 

(b) 

45,888 shares of restricted stock were delivered by employees to Marathon Oil, upon vesting, to satisfy tax withholding requirements.
In January 2006, we announced a $2.0 billion share repurchase program. Our Board of Directors subsequently increased the authorization for repurchases 
under the program by $500 million in January 2007, by $500 million in May 2007, by $2.0 billion in July 2007, and by $1.2 billion in December 2013, for 
a total authorized amount of $6.2 billion. 
As of December 31, 2018, we have repurchased 157 million common shares at a cost of approximately $5.4 billion, excluding transaction fees and 
commissions. Of this total, approximately 20 million shares were acquired at a cost of approximately $362 million during the fourth quarter of 2018.  The 
remaining share repurchase authorization as of December 31, 2018 is approximately $800 million. Purchases under the program are made at our 
discretion and may be in either open market transactions, including block purchases, or in privately negotiated transactions using cash on hand, cash 
generated from operations, proceeds from potential asset sales or cash from available borrowings to acquire shares.  This program may be changed based 
upon our financial condition or changes in market conditions and is subject to termination prior to completion.  Shares repurchased as of December 31, 
2018 were held as treasury stock. 

25

Item 6.   Selected Financial Data

(In millions, except per share data)
Statement of Income Data(a)(b)(c)
Total revenues and other income
Income (loss) from continuing operations
Discontinued operations
Net income (loss)
Per Share Data(a)(b)(c)
Basic:

Income (loss) from continuing operations
Discontinued operations
Net income (loss)

Diluted:

Income (loss) from continuing operations
Discontinued operations
Net income (loss)

Statement of Cash Flows Data(b)
Additions to property, plant and equipment related to

continuing operations

Dividends paid
Dividends per share
Balance Sheet Data at December 31
Total assets
Total long-term debt, including capitalized leases
(a) 

2018

Year Ended December 31,
2016

2017

2015

2014

$

6,582
1,096
—
1,096

$

4,765
(830)
(4,893)
(5,723)

$

3,787
(2,087)
(53)
(2,140)

$

4,953
(1,701)
(503)
(2,204)

9,646
710
2,336
3,046

1.30

$
— $
$

1.30

1.29

$
— $
$

1.29

(0.97) $
(5.76) $
(6.73) $

(0.97) $
(5.76) $
(6.73) $

(2.55) $
(0.06) $
(2.61) $

(2.55) $
(0.06) $
(2.61) $

(2.51) $
(0.75) $
(3.26) $

(2.51) $
(0.75) $
(3.26) $

1.04
3.44
4.48

1.04
3.42
4.46

(2,753) $
169
0.20

$

(1,974) $
170
0.20

$

(1,204) $
162
0.20

$

(3,485) $
460
0.68

$

(4,937)
543
0.80

$

21,321
5,499

$

22,012
5,494

$

31,094
6,581

$

32,311
7,268

35,983
5,285

$

$
$
$

$
$
$

$

$

$

Includes impairments to producing properties of $75 million, $229 million, $67 million, $381 million and $132 million in 2018, 2017, 2016, 2015 and 
2014 and impairments to unproved properties of $208 million, $246 million, $195 million, $655 million and $306 million in 2018, 2017, 2016, 2015 and 
2014 (see Item 8. Financial Statements and Supplementary Data – Note 11 to the consolidated financial statements).  Includes a goodwill impairment of 
$340 million in 2015 related to the U.S. reporting unit.

(b)  We closed on the sale of our Canada business in 2017 which resulted in an after-tax non-cash impairment charge of $4.96 billion and our Angola assets 
and Norway business in 2014 (see Item 8. Financial Statements and Supplementary Data – Note 5 to the consolidated financial statements).  The 
applicable periods have been recast to reflect as discontinued operations.   

(c)  December 31, 2016 includes the increase of a valuation allowance on certain of our deferred tax assets for $1,346 million.

26

Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion and analysis of our financial condition and results of operations should be read in conjunction 
with the information under Item 8. Financial Statements and Supplementary Data and the other financial information found 
elsewhere in this Form 10-K. The following discussion includes forward-looking statements that involve certain risks and 
uncertainties. See "Disclosures Regarding Forward-Looking Statements" (immediately prior to Part I) and Item 1A. Risk 
Factors. 

Each of our two reportable operating segments are organized by geographic location and managed according to the nature 

of the products and services offered.

•  United States – explores for, produces and markets crude oil and condensate, NGLs and natural gas in the United 

States;

• 

International – explores for, produces and markets crude oil and condensate, NGLs and natural gas outside of the 
United States and produces and markets products manufactured from natural gas, such as LNG and methanol, in E.G.

Executive Overview

During 2018, we continued our outstanding operational execution and capital efficiency across our multi-basin U.S. 

portfolio, maintained a strong balance sheet and delivered solid financial results.  Total proved reserves were 1.3 billion boe and 
total assets were $21.3 billion at December 31, 2018.  Additionally in 2018, we closed on the sale of our subsidiary, Marathon 
Oil Libya Limited and entered into agreements to complete a full country exit in Kurdistan.  Our 2018 financial and operating 
results highlighted below reflect our ongoing commitment to our core strategy of continuous corporate returns improvement, 
sustainable cash flow generation at conservative oil prices and the return of capital to shareholders. 

Key highlights include the following:

Simplifying and concentrating our portfolio

•  Early in 2018 we closed on the sale of our Libya subsidiary for proceeds of approximately $450 million resulting in a 

gain of $255 million and received $750 million in remaining proceeds from the sale of our Canadian business. 

•  During 2018 we entered into agreements for the sale of our interest in the non-operated Sarsang and Atrush blocks 
which will complete our full country exit from Kurdistan.  We expect the remaining transaction for our subsidiary 
Marathon Oil KDV B.V., which holds our non-operated interest in the Atrush block, to close in the first half of 2019.

• 

• 

In July 2018 we closed on the sale of non-core, non-operated conventional assets in the U.S. segment for a pre-tax gain 
of $32 million, including three in the Gulf of Mexico, further concentrating and simplifying our portfolio.

In Northern Delaware we acquired 1,800 net acres in New Mexico for $105 million from the Bureau of Land 
Management lease sale, which is synergistic with our existing footprint in the resource play.

•  Captured approximately 260,000 net acres in the emerging Louisiana Austin Chalk play at a cost of less than $850 per 

acre. 

Strengthened balance sheet and liquidity

•  Returned additional capital to shareholders in 2018 by acquiring 36 million of common shares at a cost of $700 

million, with $800 million of repurchase authorization remaining.

•  Reduced estimated costs of our asset retirement obligations by $338 million primarily through accelerating our U.K. 
abandonment timing to capture favorable market conditions and through the disposition of Gulf of Mexico assets.

•  Cash and cash equivalents increased approximately $900 million as a result of the sale of our Libya subsidiary and the 

receipt of the remaining proceeds from the sale of our Canadian business.

•  Cash provided by operating activities from continuing operations increased by 63%, compared to the same period last 
year, to $3,234 million primarily as a result of increased price realizations and net sales volumes in our U.S. resource 
plays.

Financial and operational results

•  Total net sales volumes for the year were 420 mboed, including 298 mboed in the U.S.  Our U.S. net sales volumes 

increased 64 mboed and our wells to sales increased 18% compared to 2017.

•  Added proved reserves of 186 mmboe for a reserve replacement ratio from continuing operations of 125%.

•  Our net income per share from continuing operations was $1.30 in 2018 as compared to a net loss per share of $0.97 

last year.  Included in the 2018 net income are:

27

  An increase in revenues of approximately 39% compared to 2017, as a result of increased price realizations of 28% 

and a 27% increase in net sales volumes in the United States.

  Our net gain on disposal of assets increased in 2018 to $319 million due to the sale of our Libya subsidiary for 

$255 million.

  Production expense, taxes other than income and shipping, handling and other increased 18%, 63% and 33%, 

during 2018 as a result of an increase in net sales volumes across our U.S. resource plays.

  Exploration and impairment expenses decreased by $274 million to $364 million, year over year, primarily due to 
non-cash impairment charges on proved and unproved properties in 2017.  See Item 8. Financial Statements and 
Supplementary Data - Note 11 to the consolidated financial statements for further detail.

Outlook 

Capital Budget 

On February 13, 2019 we announced our total 2019 Capital Budget of $2.6 billion, which includes approximately $2.4 
billion of development capital and approximately $200 million to fund resource play leasing and exploration ("REx").  Our $2.4 
billion development capital budget is 95% dedicated to the four U.S. resource plays with approximately 60% allocated to the 
Eagle Ford and Bakken and approximately 40% allocated to Oklahoma and the Northern Delaware.

Our 2019 Capital Budget is broken down by reportable segment in the table below:

(In millions)
United States(a)
International and corporate other(b)

Total Capital Budget

(a)  Includes approximately $200 million of spend to fund REx.
(b)  International and corporate other includes our International segment and other corporate items.

Operations

$

$

Capital Budget

2,525
75
2,600

Our net sales volumes increased 11% in 2018 primarily as a result of new wells to sales across all U.S. resource plays.

The following table presents a summary of our sales volumes for each of our segments.  Refer to the Results of Operations 

section for a price-volume analysis for each of the segments.

Net Sales Volumes
United States (mboed)
International (mboed)(a)
Total continuing operations (mboed)
(a)    We closed on the sale of our Libya subsidiary in the first quarter of 2018. Years ended December 31, 2018, 2017 and 2016 includes net sales volumes 

(16)%

11 %

2017

2016

2018

19%

10%

122

379

420

234

298

145

5%

223

122

345

Increase
(Decrease)
27 %

Increase
(Decrease)

relating to Libya of 8 mboed, 20 mboed and 3 mboed.

28

United States 

Net sales volumes in the segment were higher during the year ended December 31, 2018 primarily as a result of new wells 

to sales across all U.S. resource plays.  The following tables provide additional details regarding net sales volumes, sales mix 
and operational drilling activity for our significant operations within this segment:  

Net Sales Volumes
 Equivalent Barrels (mboed)

Eagle Ford
Bakken
Oklahoma
Northern Delaware
Other United States(a)

Total United States (mboed)

2018

Increase
(Decrease)

2017

Increase
(Decrease)

2016

108
84
74
20
12
298

7%
50%
37%
233%
(29)%
27%

101
56
54
6
17
234

(4)%
4%
54%
100%
(41)%
5%

105
54
35
—
29
223

(a)      Year ended December 31, 2018 includes decreases of 5 mboed, relating primarily to the disposition of certain assets in the Gulf of Mexico and 

conventional assets in Oklahoma in July 2018 and September 2017 and Colorado in October 2017. Additionally, year ended December 31, 2017 includes 
decreases of 14 mboed, consisting of the disposition of Wyoming and certain non-operated CO2 and waterflood assets in West Texas and New Mexico in 
2016.  See Item 8. Financial Statements and Supplementary Data - Note 5 to the consolidated financial statements for information about these 
dispositions.

Sales Mix - U.S. Resource Plays - 2018

Crude oil and condensate

Natural gas liquids

Natural gas

Drilling Activity - U.S. Resource Plays
Gross Operated
Eagle Ford:

Wells drilled to total depth
Wells brought to sales

Bakken:

Wells drilled to total depth
Wells brought to sales

Oklahoma:

Wells drilled to total depth
Wells brought to sales

Northern Delaware:

Wells drilled to total depth
Wells brought to sales

Eagle
Ford

59%

21%

20%

Bakken

Oklahoma

85%

8%

7%

25%

28%

47%

Northern
Delaware

58%

20%

22%

Total

57%

20%

23%

2018

2017

2016

123
149

78
80

55
57

69
52

182
157

90
39

86
73

27
18

168
168

3
13

33
28

—
—

• 

• 

Eagle Ford – Our net sales volumes were 108 mboed in 2018, which was 7% higher compared to 2017.  We brought 
149 gross company-operated wells to sales in 2018.  In Atascosa County, we brought online 40 wells during 2018 with 
strong well results, demonstrating the strength of the extended core.  During 2018, we generated significant cash flow, 
improved well productivity with annual oil growth of 7%, despite 5% fewer gross company-operated wells to sales. 

Bakken – Our net sales volumes of 84 mboed in 2018 represented a 50% increase over the prior year of 56 mboed.  We 
brought 80 gross company-operated wells to sales in 2018 with continued impressive well results. During 2018, we 
delivered best-in-basin well performance, significant cash flow, capital efficient annual oil growth of 53%, and 
successful core extension tests in the Ajax, Southern Hector and Elk Creek areas.  During the fourth quarter we 
conducted a successful core extension test in the Ajax area of Dunn County, as the four-well Gloria pad achieved 
strong results at an average completed well cost of approximately $5 million.

29

• 

• 

Oklahoma – Our net sales volumes in 2018 increased by 37% from 2017, with net sales volumes of 74 mboed. We 
brought 57 gross company-operated wells to sales in 2018.  In 2018, we successfully transitioned to infill development 
in the over-pressured STACK Meramec and SCOOP Woodford, delivering competitive returns and predictable results 
at various spacing designs.

Northern Delaware – Our net sales volumes were 20 mboed in 2018 while bringing 52 gross company-operated wells 
to sales.  We continue to make significant progress in improving efficiencies and midstream access for all products to 
protect and enhance margins.  During the fourth quarter, we executed a comprehensive water management agreement 
covering the entire Red Hills prospect area, complementing a previously announced agreement in Eddy County. 

International 

 Net sales volumes in the segment were lower during the year ended December 31, 2018 primarily due to the sale of our 
subsidiary in Libya, planned maintenance activities and natural declines in E.G. The following table provides details regarding 
net sales volumes for our significant operations within this segment:  

Net Sales Volumes

Equivalent Barrels (mboed)

Equatorial Guinea
United Kingdom(a)
Libya
Other International

Total International

Equity Method Investees

LNG (mtd)
Methanol (mtd)
Condensate and LPG (boed)
Includes natural gas acquired for injection and subsequent resale.

(a)   

2018

97
13
8
4
122

5,805
1,241
13,034

Increase
(Decrease)

(11)%
(7)%
(60)%
100%
(16)%

(10)%
(10)%
(10)%

2017

109
14
20
2
145

6,423
1,374
14,501

Increase
(Decrease)

7%
(18)%
567%
100%
19%

9%
1%
8%

2016

102
17
3
—
122

5,874
1,358
13,430

• 

• 

• 

Equatorial Guinea – Net sales volumes in 2018 were lower than 2017 as a result of timing of liftings, natural field 
decline and planned maintenance activities during the year.

United Kingdom – Net sales volumes in 2018 were slightly lower than 2017 primarily due to unscheduled downtime at 
the non-operated Foinaven complex in the fourth quarter 2018.

Libya – During the first quarter of 2018 we closed on the sale of our subsidiary in Libya.  See Note 5 to the 
consolidated financial statements for further information. 

Market Conditions

Crude oil and condensate and NGLs benchmarks increased in 2018 as compared to the same period in 2017.  As a result, 
we experienced increased price realizations associated with those benchmarks.  We continue to expect crude oil and condensate, 
NGLs and natural gas benchmark prices to remain volatile based on global supply and demand, which will result in increases or 
decreases in our price realizations during 2019.  See Item 1A. Risk Factors and Item 7. Management’s Discussion and 
Analysis of Financial Condition – Critical Accounting Estimates for further discussion of how declines in commodity prices 
could impact us.  Additional detail on market conditions, including our average price realizations and benchmarks for crude oil 
and condensate, NGLs and natural gas relative to our operating segments, follows.

30

United States 

 The following table presents our average price realizations and the related benchmarks for crude oil and condensate, NGLs 

and natural gas for 2018, 2017 and 2016.  

Average Price Realizations(a)

Crude oil and condensate (per bbl)(b)
Natural gas liquids  (per bbl)
Natural gas (per mcf)(c)

Benchmarks

WTI crude oil average of daily prices (per bbl)
LLS crude oil average of daily prices (per bbl)
Mont Belvieu NGLs (per bbl)(d)
Henry Hub natural gas settlement date average (per mmbtu)

2018

Increase
(Decrease)

2017

Increase
(Decrease)

2016

$

$

63.11
24.54
2.65

64.90
70.04
28.63
3.09

28 % $
19 %
(7)%

28 % $
30 %
20 %
(1)%

49.35
20.55
2.84

50.85
54.04
23.76
3.11

28% $
56%
19%

17% $
20%
37%
26%

38.57
13.15
2.38

43.47
45.02
17.40
2.46

(a) 

(b) 

(c) 

Excludes gains or losses on commodity derivative instruments.
Inclusion of realized gains (losses) would have impacted average price realizations by $(4.60) per bbl, $0.75 per bbl, and $0.92 per bbl for 2018, 2017, 
and 2016. 
Inclusion of realized gains (losses) on natural gas derivative instruments would have a minimal impact on average price realizations for the periods 
presented.

(d)  Bloomberg Finance LLP:  Y-grade Mix NGL of 50% ethane, 25% propane, 10% butane, 5% isobutane and 10% natural gasoline.

Crude oil and condensate – Price realizations may differ from benchmarks due to the quality and location of the product. 

Natural gas liquids – The majority of our sales volumes are at reference to Mont Belvieu prices. 

Natural gas – A significant portion of volumes are sold at bid-week prices, or first-of-month indices relative to our 

producing areas.  

International 

The following table presents our average price realizations and the related benchmark for crude oil for 2018, 2017 and 

2016.  

Average Price Realizations

Crude oil and condensate (per bbl)
Natural gas liquids (per bbl)
Natural gas (per mcf)

Benchmark

Brent (Europe) crude oil (per bbl)(a)

2018

Increase
(Decrease)

2017

Increase
(Decrease)

2016

$

64.25
2.27
0.54

21 % $
(28)%
(2)%

53.05
3.15
0.55

27% $
49%
6%

41.70
2.11
0.52

$

71.06

31 % $

54.25

25% $

43.55

(a)  Average of monthly prices obtained from the United States Energy Information Agency website.

United Kingdom

Crude oil and condensate – Generally sold in relation to the Brent crude benchmark. 

Equatorial Guinea

Crude oil and condensate – Alba Field liquids production is primarily condensate and generally sold in relation to the 
Brent crude benchmark.  Alba Plant LLC processes the rich hydrocarbon gas which is supplied by the Alba Field under a fixed 
price long term contract.  Alba Plant LLC extracts NGL’s and secondary condensate which is then sold by Alba Plant LLC at 
market prices, with our share of the revenue reflected in income from equity method investments on the consolidated statements 
of income. 

Natural gas liquids – Wet gas is sold to Alba Plant LLC at a fixed-price term contract resulting in realized prices not fully 

tracking market price.  Alba Plant LLC extracts NGLs, which are sold at market price, with our share of income from Alba 
Plant LLC being reflected in the income from equity method investments on the consolidated statements of income.

31

Natural gas - Dry natural gas is sold to EGHoldings and AMPCO at fixed-price long term contracts resulting in realized 
prices not fully tracking market price. We derive additional value from the equity investment in our downstream gas processing 
units EG LNG and AMPCO that market LNG and methanol at market prices.

Consolidated Results of Operations: 2018 compared to 2017 

Revenues from contracts with customers are presented by segment in the table below:

(In millions)
Revenues from contracts with customers

United States
International

Segment revenues from contracts with customers

Year Ended December 31,

2018

2017

$

$

4,886 $
1,016
5,902 $

3,093
1,154
4,247

Below is a price/volume analysis for each segment.  Refer to the preceding Operations and Market Conditions sections 

for additional detail related to our net sales volumes and average price realizations. 

(In millions)

Year Ended
December 31, 2017

Price Realizations

Net Sales Volumes

Year Ended
December 31, 2018

Increase (Decrease) Related to

United States Price/Volume Analysis
Crude oil and condensate
Natural gas liquids
Natural gas
Other sales
Total

$

$

International Price/Volume Analysis
Crude oil and condensate
Natural gas liquids
Natural gas
Other sales
Total

$

$

$

$

2,402
324
361
6
3,093

1,000
15
97
42
1,154

$

$

861
80
(30)

155
(4)
(2)

684
91
82

$

$

(267) $
(2)
(9)

$

3,947
495
413
31
4,886

888
9
86
33
1,016

Net loss on commodity derivatives decreased $22 million in 2018 from 2017.  We have multiple crude oil and natural gas 

derivative contracts indexed to NYMEX WTI and Henry Hub.  We record commodity derivative gains/losses as the index 
pricing and forward curves change each period.  See Note 14 to the consolidated financial statements for further information.

Marketing revenues decreased $162 million in 2018 from 2017.  This decrease is the result of adopting the new revenue 
standard, ASC Topic 606, Revenue from Contracts with Customers during the first quarter of 2018.  As a result of this standard, 
we have changed our presentation of marketing revenues and marketing expenses from the historical gross presentation to a net 
presentation.  See Note 2 to the consolidated financial statements for further information.

Income from equity method investments decreased $31 million primarily due to higher production costs and lower volumes 

and pricing at our E.G. LNG production facility.  Our higher production costs and lower volumes were primarily driven by 
planned maintenance activities during the first quarter 2018. 

Net gain on disposal of assets increased $261 million in 2018 from 2017. This increase was primarily related to the 2018 

sale of our Libya subsidiary for a pre-tax gain of $255 million; and also includes the sale of non-core assets in the Gulf of 
Mexico and our International segment during the current year.  See Item 8. Financial Statements and Supplementary Data - 
Note 5 to the consolidated financial statements for information about these dispositions.        

Other income increased $72 million in 2018 from 2017 primarily a result of the reduction of our U.K. asset retirement 
obligation during 2018.  See Item 8. Financial Statements and Supplementary Data - Note 12 to the consolidated financial 
statements for detail about our asset retirement obligation. 

Production expenses increased $126 million during 2018 from 2017 primarily due to higher sales volumes across our 
United States segment.  Our United States segment increased $149 million primarily due to higher costs as a result of increased 

32

sales volumes and new wells to sales in our developing Northern Delaware asset.  International segment decreased $24 million 
primarily due to the sale of our subsidiary in Libya in the first quarter 2018.  

The following table provides production expense and production expense rates for each segment: 

(in millions/$ per boe)
Production Expense and Production Expense Rate
United States
International

2018

Expense
$
$

625 $
215 $

2017

Rate

Expense

Rate

5.75 $
4.86 $

476 $
239 $

5.57
4.51

Marketing costs decreased $168 million in 2018 from 2017.  This decrease is the result of adopting the new revenue 

standard, ASC Topic 606, Revenue from Contracts with Customers during the first quarter of 2018.  As a result of this standard, 
we have changed our presentation of marketing revenues and marketing expenses from the historical gross presentation to a net 
presentation. See Note 2 to the consolidated financial statements for further information.

Shipping, handling and other operating expenses increased $144 million in 2018 from 2017 primarily as a result of 

increased sales volumes in our United States segment.

 Exploration expenses decreased $120 million during 2018 versus the comparable 2017.  The decrease was primarily due to 
lower unproved property impairments and dry well costs in certain non-core international properties in 2018 versus 2017.   See 
Item 8. Financial Statements and Supplementary Data - Note 11 to the consolidated financial statements for details of these 
items. 

The following table summarizes the components of exploration expenses:

(In millions)
Exploration Expenses

Unproved property impairments
Dry well costs
Geological and geophysical
Other

Total exploration expenses

Year Ended December 31,

2018

2017

$

$

208 $
47
21
13
289 $

246
77
25
61
409

Depreciation, depletion and amortization increased $69 million in 2018 from 2017 primarily as a result of an increase of 

$206 million in the United States segment primarily due to higher sales volumes across all U.S. resource plays.  Offsetting this 
higher expense was a decrease of $131 million in our International segment primarily due to the reduction of our estimated 
U.K. asset retirement costs.  Additionally, lower sales volumes in E.G., asset sales in Libya and Kurdistan all contributed to the 
lower expense during 2018.  Our segments apply the units-of-production method to the majority of their assets, including 
capitalized asset retirement costs; therefore, volumes have an impact on DD&A expense.

The DD&A rate (expense per boe), which is impacted by field-level changes in reserves, capitalized costs and sales 
volumes, can also impact our DD&A expense. Our United States DD&A rate decreased in 2018 primarily due to increased 
proved developed reserves in our U.S. resource plays in late 2017; as well as reduced capitalized costs relating to the Gulf of 
Mexico impairment charge in 2017 and the subsequent sale of these assets in 2018. The DD&A rate for International decreased 
with the reduction of our estimated U.K. asset retirement costs in the second half of 2018 and 2017. 

The following table provides DD&A rates for each segment: 

($ per boe)
DD&A Rate
United States
International

2018

2017

$
$

20.39 $
4.44 $

23.51
6.19

 Impairments decreased $154 million in 2018 from 2017.  This decrease was primarily the result of the proved property 
impairments in the third quarter 2017 in certain non-core international properties and certain properties in the Gulf of Mexico.  
See Item 8. Financial Statements and Supplementary Data - Note 11 to the consolidated financial statement for detail of proved 
property impairments each year. 

Taxes other than income tend to increase or decrease in relation to revenue and sales volumes, primarily in the U.S.  As 

U.S. sales volumes and revenues increased during 2018, this resulted in an increase of $116 million compared to 2017.  
Additionally, the State of Oklahoma approved an increase to the gross production tax from 2% to 5% on all existing and new 
wells for the first thirty-six months, effective July 1, 2018. The following table summarizes the components of taxes other than 
33

 
 
income: 

(In millions)
Taxes other than income
Production and severance
Ad valorem
Other

Total taxes other than income

Year Ended December 31,

2018

2017

$

$

208 $
23
68
299 $

121
13
49
183

General and administrative expenses increased $23 million in 2018 compared to 2017. This was primarily the result of 

officer and non-officer compensation, including improved performance of stock-based performance units.  

Net interest and other decreased $44 million during 2018 compared to 2017. This decrease was primarily due the 

redemption of $1.76 billion of debt during 2017, partially offset by the termination of our forward starting interest rate swaps in 
2017, which resulted in a gain of $46 million.  The components of net interest and other are detailed in Item 8. Financial 
Statements and Supplementary Data - Note 21 to the consolidated financial statements.

Loss on early extinguishment of debt decreased $51 million in 2018 compared to 2017 primarily due to make-whole call 

provisions paid upon redemption of $1.76 billion in senior unsecured notes in 2017.  See Item 8. Financial Statements and 
Supplementary Data - Note 16 to the consolidated financial statements for further detail.

Provision (benefit) for income taxes reflects an effective tax rate from continuing operations of 23% and 83% for 2018 and 

2017.  See Item 8. Financial Statements and Supplementary Data - Note 8 to the consolidated financial statements for a 
discussion of the effective income tax rate. 

Discontinued operations are presented net of tax. See Item 8. Financial Statements and Supplementary Data - Note 5 to the 

consolidated financial statements for financial information concerning our discontinued operations.

Segment Results: 2018 compared to 2017

Segment Income (Loss) 

Segment income (loss) represents income (loss) from continuing operations excluding certain items not allocated to 

operating segments, net of income taxes.  A portion of our corporate and operations general and administrative support costs are 
not allocated to the operating segments.  Gains or losses on dispositions, certain impairments, unrealized gains or losses on 
commodity derivative instruments, pension settlement losses, or other items (as determined by the CODM) are not allocated to 
operating segments.

The following table reconciles segment income (loss) to net income (loss):

(In millions)
United States
International

Segment income (loss)

Items not allocated to segments, net of income taxes(a)
    Income (loss) from continuing operations
    Income (loss) from discontinued operations(b)

Net income (loss)

Year Ended December 31,

2018

2017

$

$

608
473
1,081
15
1,096
—
1,096

$

$

(148)
374
226
(1,056)
(830)
(4,893)
(5,723)

(a)    See Item 8. Financial Statements and Supplementary Data - Note 7 to the consolidated financial statements for further detail about items not allocated to 

segments. 

(b)

  We sold our Canadian business in the second quarter of 2017.  The Canadian business is reflected as discontinued operations in 2017.  

 United States segment income increased $756 million after-tax in 2018 compared to 2017 primarily due to higher price 

realizations and an increase in net sales volumes, which resulted in increased revenues. This increase in revenue was partially 
offset by an increase in our net loss on commodity derivatives.  Additionally, our increase in net sales volumes resulted in a 
corresponding increase to production expenses, DD&A, taxes other than income, and shipping, handling and other operating 
expenses which partially offset the increase to revenues. 

 International segment income increased $99 million after-tax in 2018 compared to 2017 as a result of increased income in 
Other International and the U.K. primarily as a result of increased price realizations and an increase in Other International sales 
34

 
volumes.  Lower expenses in 2018 were primarily driven by lower DD&A expense as a result of the decrease in estimated U.K. 
asset retirement costs, lower E.G. sales volumes and the sale of certain Other International properties.  This was partially offset 
by lower income in Libya due to the 2018 sale of our Libya subsidiary (see Note 5 to the consolidated financial statements for 
further information).

Consolidated Results of Operations: 2017 compared to 2016 

Revenues from contracts with customers are presented by segment in the table below:

(In millions)
Revenues from contracts with customers

United States
International

Segment revenues from contracts with customers

Year Ended December 31,

2017

2016

$

$

3,093 $
1,154
4,247 $

2,331
665
2,996  

Below is a price/volume analysis for each segment.  Refer to the preceding Operations and Market Conditions sections 

for additional detail related to our net sales volumes and average price realizations.

Year Ended
December 31, 2016

Increase (Decrease) Related to
Net Sales
Volumes

Price Realizations

Year Ended
December 31, 2017

$

(In millions)
United States Price/Volume Analysis(a)
Crude oil and condensate
Natural gas liquids
Natural gas
Other sales
$
Total
International Price/Volume Analysis
Crude oil and condensate
$
Natural gas liquids
Natural gas
Other sales
Total

$

$

$

1,852
189
274
16
2,331

537
9
87
32
665

$

$

525
117
58

214
5
4

25
18
29

249
1
6

$

$

$

$

2,402
324
361
6
3,093

1,000
15
97
42
1,154

(a)          Year ended December 31, 2016 includes sales volumes of 14 mboed on an annualized basis relating to assets sold when compared to 2017, primarily 

consisting of the disposition of Wyoming and certain non-operated CO2 and waterflood assets in West Texas and New Mexico in 2016.

Net gain (loss) on commodity derivatives decreased $30 million in 2017 from 2016.  We have multiple crude oil and 
natural gas derivative contracts indexed to NYMEX WTI and Henry Hub.  We record commodity derivative gains/losses as the 
index pricing and forward curves change each period. See Note 14 to the consolidated financial statements for further 
information.

Marketing revenues decreased $78 million in 2017 from 2016, primarily as a result of lower marketed volumes in the 
United States segment due to non-core asset dispositions.  Marketing activities include the purchase of commodities from third 
parties for resale and serve to aggregate volumes in order to satisfy transportation commitments as well as to achieve flexibility 
within product types and delivery points.  Since the volume of marketing activity is based on market dynamics, it can fluctuate 
from period to period. 

Income from equity method investments increased $81 million primarily due to higher price realizations from LPG at our 

Alba plant and methanol at our AMPCO methanol facility.  Also contributing to the increase was improvement in net sales 
volumes primarily driven by the completion of the Alba field compression project in E.G. during the second half of 2016.

Net gain on disposal of assets decreased $331 million in 2017 from 2016. This decrease was primarily related to the sale of 

non-core assets in the first half of 2016 in Wyoming, West Texas and New Mexico, and the Gulf of Mexico.  See Item 8. 
Financial Statements and Supplementary Data - Note 5 to the consolidated financial statements for information about these 
dispositions.

Other income increased $25 million in 2017 from 2016.  This increase was primarily a result of a downward revision in 
U.K. estimated asset retirement costs as well as timing of abandonment activities in the U.K.  See Item 8. Financial Statements 
and Supplementary Data - Note 12 to the consolidated financial statements for detail about our asset retirement obligation.

35

Production expenses remained nearly flat during 2017 while our sales volumes from continuing operations increased.  
During 2017, our production expense rate (expense per boe) for United States was lower primarily due to the disposition of 
higher cost non-core assets in Wyoming.  The International expense rate decreased in the year of 2017 primarily due to an 
increase in sales volumes in E.G. and Libya, combined with lower maintenance costs in E.G.

($ per boe)
Production Expense Rate
United States
International

2017

2016

Expense

Rate

Expense

Rate

$
$

476 $
239 $

5.57 $
4.51 $

486 $
234 $

5.96
5.26

Marketing costs decreased $77 million in 2017 from the prior year, consistent with the decrease in marketing revenues 

discussed above. 

Shipping, handling, and other operating expenses decreased $53 million compared to 2016 which included the termination 

payment of our Gulf of Mexico deepwater drilling commitment in 2016.

 Exploration expenses increased $86 million in 2017 versus the comparable 2016 period, due primarily to charges taken as 

a result of lower forecasted long-term commodity prices and the anticipated sales of certain non-core properties in our 
International segment.  In 2017, we recorded non-cash charges of $159 million comprised of $95 million in unproved property 
impairments in our International segment and $64 million dry well costs related to our Diaba License G4-223 in the Republic of 
Gabon.  Additionally, our decision not to develop the Tchicuate offshore Block in the Republic of Gabon resulted in an increase 
to exploration expenses of $43 million during 2017.  Unproved property impairments during 2016 primarily consist of non-cash 
charges related to our decision to not drill our remaining Gulf of Mexico leases. 

The following table summarizes the components of exploration expenses:

(In millions)
Exploration Expenses
Unproved property impairments
Dry well costs
Geological and geophysical
Other

Total exploration expenses

Year Ended December 31,

2017

2016

$

$

246 $
77
25
61
409 $

195
25
5
98
323

Exploration expense are also discussed in Item 8. Financial Statements and Supplementary Data - Note 11 to the 

consolidated financial statements.

Depreciation, depletion and amortization increased $216 million in 2017 from the prior year primarily as a result of an 
increase of $176 million in the United States due to a 5% increase in net sales volumes, and an increase in the DD&A rates 
within our U.S. resource plays.  Also contributing to this higher expense was an increase of $52 million in our International 
segment resulting from increased sales volumes due to the completion and start-up of our E.G. Alba field compression project 
in mid-2016, and the resumption of sales volumes and production in Libya.  Our segments apply the units-of-production 
method to the majority of their assets, including capitalized asset retirement costs; therefore, volumes have an impact on DD&A 
expense.

The DD&A rate (expense per boe), which is impacted by field-level changes in sales volumes, reserves and capitalized 
costs, can also cause changes to our DD&A. The DD&A rate for United States increased primarily due to the sales volume mix 
between our U.S. resource plays, and the outside-operated Gunflint field achieving first production in mid-2016.  Also 
contributing to the increase was a reduction to the Eagle Ford proved developed reserve base in the fourth quarter of 2016.  The 
DD&A rate for our International segment remained relatively consistent with the 2016 rate.  The following table provides 
DD&A rates for each segment. 

($ per boe)
DD&A Rate
United States
International

2017

2016

$
$

23.51 $
6.19 $

22.49
6.21

36

 
 
 
 Impairments increased $162 million in 2017 from the comparable 2016 period.  This increase was primarily consisting of 

$136 million of proved property impairments in certain non-core properties in our International segment as a result of our 
anticipated sales and lower forecasted long-term commodity prices.  Additionally, included in proved property impairments was 
$89 million in 2017 and $67 million in 2016, both relating to lower forecasted commodity prices in conventional properties in 
Oklahoma and the Gulf of Mexico.  See Item 8. Financial Statements and Supplementary Data - Note 11 to the consolidated 
financial statement for additional detail. 

 Taxes other than income includes production, severance and ad valorem taxes, primarily in the U.S., which tend to 
increase or decrease in relation to revenue and sales volumes.  Taxes other than income increased $32 million in the current 
year as a result of increased revenue and sales volumes, and due to a reserve being established for non-income tax examinations 
relating to open tax years.   

The following table summarizes the components of taxes other than income: 

(In millions)
Taxes other than income
Production and severance
Ad valorem
Other

Total taxes other than income

Year Ended December 31,

2017

2016

$

$

121 $
13
49
183 $

91
23
37
151

Net interest and other decreased $62 million during 2017 primarily as a result of the termination of our forward starting 

interest rate swaps, which resulted in a gain of $46 million.  Additionally, during 2017 we reduced total long-term debt by 
approximately $1.75 billion which resulted in a reduction to our net interest and other.  The components of net interest and 
other are detailed in Item 8. Financial Statements and Supplementary Data - Note 16 to the consolidated financial statements.

Loss on early extinguishment of debt increased $51 million in 2017 primarily due to make-whole call provisions of $46 

million paid upon the redemption of $1.76 billion in senior unsecured notes.  See Item 8. Financial Statements and 
Supplementary Data - Note 16 to the consolidated financial statements for further detail.

Other net periodic benefit costs decreased $83 million primarily due to reduced pension settlement charges of $32 million 

in 2017 compared to $103 million in 2016.

Provision (benefit) for income taxes reflects an effective tax rate from continuing operations of 83% and 79% for 2017 and 

2016.  In 2017, our tax expense was primarily a result of our full valuation allowance on our net federal deferred tax assets 
throughout 2017 and the effects of our foreign operations.  See Item 8. Financial Statements and Supplementary Data - Note 8 
to the consolidated financial statements for a discussion of the effective income tax rate. 

Discontinued operations are presented net of tax. See Item 8. Financial Statements and Supplementary Data - Note 5 to the 

consolidated financial statements for financial information concerning our discontinued operations.

37

Segment Results: 2017 compared to 2016 

Segment Income (Loss) 

Segment income (loss) represents income (loss) from continuing operations excluding certain items not allocated to 

operating segments, net of income taxes.  A portion of our corporate and operations general and administrative support costs are 
not allocated to the operating segments.  Gains or losses on dispositions, certain impairments, unrealized gains or losses on 
commodity derivative instruments, pension settlement losses, or other items (as determined by the CODM) are not allocated to 
operating segments.

The following table reconciles segment income (loss) to net income (loss):

Year Ended December 31,

2017

2016

(148) $
374
226
(1,056)
(830)
(4,893)
(5,723) $

(415)
228
(187)
(1,900)
(2,087)
(53)
(2,140)

(In millions)
United States
International

Segment income (loss)

$

Items not allocated to segments, net of income taxes(a) 
    Income (loss) from continuing operations
    Income (loss) from discontinued operations(b)
         Net income (loss)
(a)    See Item 8. Financial Statements and Supplementary Data - Note 7 to the consolidated financial statements for further detail about items not allocated to 

$

segments. 

(b)

  We sold our Canadian business in the second quarter of 2017.  The Canadian business is reflected as discontinued operations in all periods presented.  

 United States segment loss decreased $267 million in 2017 compared to 2016 primarily due to higher price realizations 
and higher sales volumes.  Partially offsetting this revenue increase was an increase in DD&A and a decrease in the income tax 
benefit, as we did not realize a tax benefit on any net federal deferred tax assets generated in 2017 due to the full valuation 
allowance on net federal deferred tax assets in the prior year. 

 International segment income increased $146 million in 2017 compared to 2016 primarily due to higher price 

realizations, and an increase in sales volumes in E.G. and Libya. This was partially offset by an increase in DD&A and income 
tax expense as a result of the increase in sales volumes. 

Management’s Discussion and Analysis of Financial Condition, Cash Flows and Liquidity

Commodity prices are the most significant factor impacting our operating cash flows and the amount of capital available to 

reinvest into the business.  In 2018, we experienced an increase in operating cash flows primarily due to improvements in the 
commodity price environment with increased consolidated average crude oil and condensate price realizations of over 25% to 
$63.32, and an increase to net sales volumes of 11% to 420 mboed.  

During 2018 we continued our cash flow growth with highlights that include:

•  Cash and cash equivalents increased approximately $900 million to $1.5 billion at December 31, 2018.

•  Cash provided by operating activities from continuing operations increased by 63%, compared to the same 

period last year, to $3,234 million.

•  Used this additional cash provided by operating activities to return capital to shareholders by executing $700 

million of share repurchases.

•  Received $750 million in remaining proceeds from the sale of our Canadian business and $450 million in 

proceeds from the sale of our Libya subsidiary.

•  Additionally these divestiture proceeds were used to capture additional acreage in our resource play leasing 

and exploration program of $369 million.

At December 31, 2018, we had approximately $4.9 billion of liquidity consisting of $1.5 billion in cash and cash 

equivalents and $3.4 billion available under our revolving credit facility.  Additionally, during 2018 we extended the maturity 
date of our Credit Facility from May 28, 2021, to May 28, 2022.  As previously discussed in our Outlook section, we are 
targeting a $2.6 billion Capital Budget for 2019.  We believe our current liquidity level, cash flow from operations and ability to 
access the capital markets provides us with the flexibility to fund our business throughout the different commodity price cycles. 
We will continue to evaluate the commodity price environment and our spending throughout 2019.

38

Cash Flows

The following table presents sources and uses of cash and cash equivalents from continuing operations for 2018, 2017 and 

2016:

(In millions)
Sources of cash and cash equivalents

Operating activities - continuing operations
Disposal of assets, net of cash transferred to the buyer
Common stock issuance
Borrowings
Other

Total sources of cash and cash equivalents

Uses of cash and cash equivalents

Additions to property, plant and equipment
Additions to other assets
Acquisitions, net of cash acquired
Purchases of common stock
Debt repayments
Debt extinguishment costs
Dividends paid
Other

Total uses of cash and cash equivalents

Year Ended December 31,

2018

2017

2016

$

$

$

$

3,234
1,264
—
—
93
4,591

$

$

(2,753) $
(26)
(25)
(713)
—
—
(169)
(6)
(3,692) $

1,988
1,787
—
988
68
4,831

$

$

(1,974) $
(25)
(1,891)
(11)
(2,764)
(46)
(170)
(5)
(6,886) $

901
1,219
1,236
—
56
3,412

(1,204)
—
(902)
(6)
(1)
—
(162)
(6)
(2,281)

Cash flows generated from operating activities in 2018 were 63% higher as both commodity price realizations and net sales 
volumes improved compared to 2017.  Consolidated average crude oil and condensate price realizations increased by over 25% 
and net sales volumes increased 11% during 2018 as compared to 2017. 

Proceeds from the disposals of assets for 2018 are primarily related to our non-operated interest in Libya as well as the 
remaining proceeds from the sale of our Canadian business.  Proceeds from the disposals of assets for 2017 is primarily the 
result of the disposal of our Canadian business, and in 2016 are primarily from the sale of our Wyoming upstream and 
midstream assets, as well as the sale of certain other non-operated CO2 and waterflood assets in West Texas and New Mexico.  
Disposition transactions are discussed in further detail in Item 8. Financial Statements and Supplementary Data – Note 5 to the 
consolidated financial statements.

Issuance of common stock reflects net proceeds received in 2016 from our public sale of common stock. 

Borrowings in 2017 are a result of the issuance of $1 billion of 4.4% senior unsecured notes due in 2027.  Financing 

transactions are discussed in further detail in Item 8. Financial Statements and Supplementary Data – Note 16 to the 
consolidated financial statements for additional information.

Additions to property, plant and equipment reflect a significant use of cash and cash equivalents.  The following table 

shows capital expenditures related to continuing operations by segment and reconciles to additions to property, plant and 
equipment as presented in the consolidated statements of cash flows:  

(In millions)

United States (a) 
International
Corporate

$

Total capital expenditures

Change in capital expenditure accrual

Total use of cash and cash equivalents for property, plant and equipment

$

Year Ended December 31,
2017

2016

2018

2,620
39
26
2,685
68
2,753

$

$

2,081
42
27
2,150
(176)
1,974

$

$

936
82
18
1,036
168
1,204

(a)   2018 capital expenditures includes 1,800 net acres in New Mexico for $105 million acquired from the Bureau of Land Management lease sale.

39

 
 
Additions to other assets relates to deposits on our resource play leasing and exploration program.  During 2018 our 
resource play leasing and exploration capital expenditures totaled $369 million, largely including costs within property, plant 
and equipment, other assets and acquisitions.  These expenditures were more than fully funded through the divestiture proceeds 
received in 2018.

During 2017, we closed on multiple Permian basin acquisitions for approximately $1.9 billion with cash on hand.  
Additionally, during 2016, we closed the Oklahoma STACK acquisition for a purchase price of $904 million, net of cash 
acquired. See Item 8. Financial Statements and Supplementary Data – Note 4 to the consolidated financial statements for 
further information concerning acquisitions. 

In 2018, we acquired 36 million common shares at a cost of $700 million, excluding transaction fees and commissions, 
under our share repurchase program. Shares purchased were held as treasury stock. See Note 23 to the consolidated financial 
statements for additional information.

In December 2017, we redeemed $1 billion of 5.125% municipal revenue bonds due in 2037 in a refunding transaction.  
Additionally, during the third quarter of 2017, we used the net proceeds of the borrowing disclosed above plus existing cash on 
hand to redeem $1.76 billion in senior unsecured notes resulting in a recognized loss on early extinguishment of debt of $46 
million, primarily due to make-whole call provisions.  Financing transactions are discussed in further detail in Item 8. Financial 
Statements and Supplementary Data – Note 16 to the consolidated financial statements for additional information.

During 2018, 2017 and 2016, the Board of Directors approved a $0.05 per share quarterly dividend.  See Capital 

Requirements below for additional information about the fourth quarter 2018 dividend. 

Liquidity and Capital Resources

In October 2018, we extended the maturity date of our Credit Facility from May 28, 2021, to May 28, 2022.  Fees on the 
unused commitment to the lenders, as well as the borrowing options under the Credit Facility, remain unaffected by the term 
extension.  We retain the ability to request two one-year extensions and an option to increase the commitment amount by up to 
an additional $107 million, subject to the consent of any increasing lenders.  The sub-facilities for swing-line loans and letters 
of credit remain unchanged allowing up to an aggregate amount of $100 million and $500 million, respectively.

Our main sources of liquidity are cash and cash equivalents, internally generated cash flow from operations, sales of non-
core assets, capital market transactions, and our revolving Credit Facility.  At December 31, 2018, we had approximately $4.9 
billion of liquidity consisting of $1.5 billion in cash and cash equivalents and $3.4 billion available under our revolving Credit 
Facility.  Our working capital requirements are supported by these sources and we may draw on our revolving Credit Facility to 
meet short-term cash requirements, or issue debt or equity securities through the shelf registration statement discussed below as 
part of our longer-term liquidity and capital management program.  Because of the alternatives available to us as discussed 
above, we believe that our short-term and long-term liquidity are adequate to fund not only our current operations, but also our 
near-term and long-term funding requirements including our capital spending budgets, dividend payments, defined benefit plan 
contributions, repayment of debt maturities, and other amounts that may ultimately be paid in connection with contingencies. 

General economic conditions, commodity prices, and financial, business and other factors could affect our operations and 
our ability to access the capital markets.  Our corporate credit ratings as of December 31, 2018 are: Standard & Poor's Ratings 
Services BBB- (positive); Fitch Ratings BBB (stable); and Moody's Investor Services, Inc. Ba1 (positive).  A downgrade in our 
credit ratings could increase our future cost of financing or limit our ability to access capital, and result in additional collateral 
requirements.  See Item 1A. Risk Factors for a discussion of how a further downgrade in our credit ratings could affect us.

Additionally, in December of 2017, we redeemed $1 billion of 5.125% municipal revenue bonds due in 2037 in a refunding 

transaction that preserved our ability to remarket up to $1 billion of tax-exempt municipal bonds prior to 2037.  We may incur 
additional debt in order to fund our capital expenditures, acquisitions or development activities, or for general corporate or 
other purposes.  A higher level of indebtedness could increase the risk that our liquidity and financial flexibility deteriorates.  
See Item 1A. Risk Factors for a further discussion of how our level of indebtedness could affect us.

Capital Resources

Credit Arrangements and Borrowings

At December 31, 2018, we had no borrowings against our revolving credit facility.  

At December 31, 2018, we had $5.5 billion in long-term debt outstanding, with our next debt maturity in the amount of 
$600 million due in 2020.  We do not have any triggers on any of our corporate debt that would cause an event of default in the 
case of a downgrade of our credit ratings.

40

Shelf Registration

We have a universal shelf registration statement filed with the SEC under which we, as a "well-known seasoned issuer" for 
purposes of SEC rules, have the ability to issue and sell an indeterminate amount of various types of debt and equity securities.

Asset Disposals 

We entered into an agreement to sell our subsidiary, Marathon Oil KDV B.V., which holds our 15% non-operated interest 
in the Atrush block in Kurdistan for proceeds of $63 million, before closing adjustments.  Disposition transactions are discussed 
in further detail in Item 8. Financial Statements and Supplementary Data – Note 5 to the consolidated financial statements.

Debt-To-Capital Ratio

The Credit Facility includes a covenant requiring that our ratio of total debt to total capitalization not exceed 65% as of the 

last day of each fiscal quarter.  Our debt-to-capital ratio was 31% at December 31, 2018 and 32% at December 31, 2017.

(In millions)
Long-term debt due within one year
Long-term debt
Total debt

Equity
Calculation

Total debt
 Total debt plus equity (total capitalization)

Debt-to-capital ratio

Capital Requirements

Capital Spending

$

$
$

$
$

2018

2017

— $

5,499
5,499
12,128

5,499
17,627

$
$

$
$

—
5,494
5,494
11,708

5,494
17,202

31%

32%

Our approved Capital Budget for 2019 is $2.6 billion.  Additional details were previously discussed in Outlook.

Share Repurchase Program

  In 2018, we acquired 36 million common shares at a cost of $700 million under our share repurchase program.  The 

remaining share repurchase authorization as of December 31, 2018 is $800 million.  

Other Expected Cash Outflows

On January 30, 2019, our Board of Directors approved a dividend of $0.05 per share for the fourth quarter of 2018.  The 

dividend is payable on March 11, 2019 to shareholders of record on February 20, 2019. 

We plan to make contributions of up to $50 million to our funded pension plans during 2019.  Cash contributions to be paid 
from our general assets for the unfunded pension and postretirement plans are expected to be approximately $5 million and $18 
million in 2019.  

41

Contractual Cash Obligations

The table below provides aggregated information on our consolidated obligations to make future payments under existing 

contracts as of December 31, 2018. 

(In millions)
Short and long-term debt (includes interest)(a)
Lease obligations
Purchase obligations:

Oil and gas activities(b)
Service and materials contracts(c)
Transportation and related contracts
Other (d)

Total purchase obligations
Other long-term liabilities reported in the 
consolidated balance sheet(e)
Total contractual cash obligations(f)

Total

2019

$

$

8,521
217

69
122
1,355
39
1,585

256
62

58
83
327
18
486

2020-
2021

2022-
2023

Later
Years

$

$

1,087
89

$

1,680
17

5,498
49

1
39
330
21
391

1
—
229
—
230

9
—
469
—
478

278
548
6,303
10,871
Includes anticipated cash payments for interest of $256 million for 2019, $487 million for 2020-2021, $443 million for 2022-2023 and $1,798 million for 
the remaining years for a total of $2,984 million.

56
1,983

65
1,632

149
953

$

$

$

$

$

(a) 

(b)  Oil and gas activities include contracts to acquire property, plant and equipment and commitments for oil and gas exploration such as costs related to 

(c) 

(d) 

(e) 

(f) 

contractually obligated exploratory work programs that are expensed immediately.
Service and materials contracts include contracts to purchase services such as utilities, supplies and various other maintenance and operating services.
Includes any drilling rigs and fracturing crews that are not considered lease obligations.
Primarily includes obligations for pension and other postretirement benefits including medical and life insurance.  We have estimated projected funding 
requirements through 2027.  Although unrecognized tax benefits are not a contractual obligation, they are presented in this table because they represent 
potential demands on our liquidity.
This table does not include the estimated discounted liability for dismantlement, abandonment and restoration costs of oil and gas properties of $1,145 
million. See Item 8. Financial Statements and Supplementary Data – Note 12 to the consolidated financial statements.

Transactions with Related Parties

We own a 63% working interest in the Alba field offshore E.G.  Onshore E.G., we own a 52% interest in an LPG 

processing plant, a 60% interest in an LNG production facility and a 45% interest in a methanol production plant, each through 
equity method investees.  We sell our natural gas from the Alba field to these equity method investees as the feedstock for their 
production processes.  

Off-Balance Sheet Arrangements

Off-balance sheet arrangements comprise those arrangements that may potentially impact our liquidity, capital resources 
and results of operations, even though such arrangements are not recorded as liabilities under accounting principles generally 
accepted in the U.S.  Although off-balance sheet arrangements serve a variety of our business purposes, we are not dependent 
on these arrangements to maintain our liquidity and capital resources, and we are not aware of any circumstances that are 
reasonably likely to cause the off-balance sheet arrangements to have a material adverse effect on liquidity and capital 
resources.

We will issue stand-alone letters of credit when required by a business partner.  Such letters of credit outstanding at 
December 31, 2018, 2017 and 2016 aggregated $52 million, $89 million and $166 million.  Most of the letters of credit are in 
support of obligations recorded in the consolidated balance sheet.  For example, they are issued to counterparties to support 
firm transportation agreements and future abandonment liabilities.

In 2018, we signed an agreement with a lessor to construct and lease a new build-to-suit office building in Houston, Texas. 
The new Houston office location is expected to be completed in 2021.  The lessor and other participants are providing financing 
for up to $380 million, to fund the estimated project costs.  As of December 31, 2018 project costs incurred totaled $45 million, 
primarily for land acquisition costs.  The five-year lease term will commence once construction is substantially complete and 
the new Houston office is able to be occupied. At the end of the initial lease term, we can extend the term of the lease for an 
additional five years, subject to the approval of the participants; purchase the property subject to certain terms and conditions; 
remarket the property to an unrelated third party.  As of December 31, 2018 we have recorded this agreement as an operating 
lease, see Item 8. Financial Statements and Supplementary Data – Note 24 to the consolidated financial statements for further 
information on operating leases.

42

 
 
 
 
  
Management’s Discussion and Analysis of Environmental Matters, Litigation and Contingencies

We have incurred and may continue to incur substantial capital, operating and maintenance and remediation expenditures 

as a result of environmental laws and regulations.  If these expenditures, as with all costs, are not ultimately reflected in the 
prices of our products and services, our operating results will be adversely affected.  We believe that substantially all of our 
competitors must comply with similar environmental laws and regulations.  However, the specific impact on each competitor 
may vary depending on a number of factors, including the age and location of its operating facilities, marketing areas and 
production processes.

We accrue for environmental remediation activities when the responsibility to remediate is probable and the amount of 
associated costs can be reasonably estimated.  As environmental remediation matters proceed toward ultimate resolution or as 
additional remediation obligations arise, charges in excess of those previously accrued may be required. 

New or expanded environmental requirements, which could increase our environmental costs, may arise in the future.  We 
strive to comply with all legal requirements regarding the environment, but as not all costs are fixed or presently determinable 
(even under existing legislation) and may be affected by future legislation or regulations, it is not possible to predict all of the 
ultimate costs of compliance, including remediation costs that may be incurred and penalties that may be imposed.

For more information on environmental regulations that impact us, or could impact us, see Item 1. Business – 

Environmental, Health and Safety Matters, Item 1A. Risk Factors and Item 3. Legal Proceedings.

Critical Accounting Estimates

The preparation of financial statements in accordance with accounting principles generally accepted in the U.S. requires us 

to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent 
assets and liabilities as of the date of the consolidated financial statements and the reported amounts of revenues and expenses 
during the respective reporting periods.  Accounting estimates are considered to be critical if (1) the nature of the estimates and 
assumptions is material due to the levels of subjectivity and judgment necessary to account for highly uncertain matters or the 
susceptibility of such matters to change, and (2) the impact of the estimates and assumptions on financial condition or operating 
performance is material.  Actual results could differ from the estimates and assumptions used.

Estimated Quantities of Net Reserves

We use the successful efforts method of accounting for our oil and gas producing activities. The successful efforts method 

inherently relies on the estimation of proved crude oil and condensate, NGLs and natural gas reserves. The amount of estimated 
proved reserve volumes affect, among other things, whether certain costs are capitalized or expensed, the amount and timing of 
costs depreciated, depleted or amortized into net income and the presentation of supplemental information on oil and gas 
producing activities.  In addition, the expected future cash flows to be generated by producing properties are used for testing 
impairment and the expected future taxable income available to realize deferred tax assets, also in part, rely on estimates of 
quantities of net reserves.  Refer to the applicable sections below for further discussion of these accounting estimates.

The estimation of quantities of net reserves is a highly technical process performed by our engineers and geoscientists for 

crude oil and condensate, NGLs and natural gas, which is based upon several underlying assumptions. The reserve estimates 
may change as additional information becomes available and as contractual, operational, economic and political conditions 
change.  We evaluate our reserves using drilling results, reservoir performance, seismic interpretation and future plans to 
develop acreage.  Technologies used in proved reserves estimation includes statistical analysis of production performance, 
decline curve analysis, pressure and rate transient analysis, pressure gradient analysis, reservoir simulation and volumetric 
analysis. The observed statistical nature of production performance coupled with highly certain reservoir continuity or quality 
within the reliable technology areas and sufficient proved developed locations establish the reasonable certainty criteria 
required for booking proved reserves. The data for a given reservoir may also change over time as a result of numerous factors 
including, but not limited to, additional development activity, production history and continual reassessment of the viability of 
production under varying economic conditions.  

43

Reserve estimates are based on an unweighted arithmetic average of commodity prices during the 12-month period, using 

the closing prices on the first day of each month, as defined by the SEC.  The table below provides the 2018 SEC pricing for 
certain benchmark prices:

WTI Crude oil (per bbl)

Henry Hub natural gas (per mmbtu)

Brent crude oil (per bbl)

Mont Belvieu NGLs (per bbl)

2018 SEC Pricing 

$

$

$

$

65.56

3.05

72.70

26.63

When determining the December 31, 2018 proved reserves for each property, the benchmark prices listed above were 

adjusted using price differentials that account for property-specific quality and location differences.  

Estimates of future cash flows associated with proved reserves are based on actual costs of developing and producing 

proved reserves at the end of the year. If annual SEC crude oil benchmark prices (see table above) were to decrease to 
approximately $45 per bbl, or 30% below average prices used to estimate 2018 proved reserves, we would not expect price 
related reserve revisions to have a material impact on proved reserve volumes.  For further discussion of risks associated with 
our estimation of proved reserves, see Part I. Item 1A Risk Factors.  

Depreciation and depletion of crude oil and condensate, NGLs and natural gas producing properties is determined by the 

units-of-production method and could change with revisions to estimated proved reserves.  While revisions of previous reserve 
estimates have not historically been significant to the depreciation and depletion rates of our segments, any reduction in proved 
reserves, could result in an acceleration of future DD&A expense. The following table illustrates, on average, the sensitivity of 
each segment's units-of-production DD&A per boe and pretax income to a hypothetical 10% change in 2018 proved reserves 
based on 2018 production.

Impact of a 10% Increase in Proved
Reserves

Impact of a 10% Decrease in
Proved Reserves

(In millions, except per boe)

United States
International

Asset Retirement Obligations

DD&A per boe
$
$

(1.85) $
(0.40) $

Pretax Income
202
18

DD&A per boe
2.27
$
0.49
$

Pretax Income
$
$

(246)
(22)

We have material legal, regulatory and contractual obligations to remove and dismantle long-lived assets and to restore 

land or seabed at the end of oil and gas production operations.  A liability equal to the fair value of such obligations and a 
corresponding capitalized asset retirement cost are recognized on the balance sheet in the period in which the legal obligation is 
incurred and a reasonable estimate of fair value can be made. The capitalized asset retirement cost is depreciated using the 
units-of-production method or the straight line method (dependent on the underlying asset) and the discounted liability is 
accreted over the period until the obligation is satisfied, the impacts of which are recognized as DD&A in the consolidated 
statements of income.  In many cases, the satisfaction and subsequent discharge of these liabilities is projected to occur many 
years, or even decades, into the future.  Furthermore, the legal, regulatory and contractual requirements often do not provide 
specific guidance regarding removal practices and the criteria that must be fulfilled when the removal and/or restoration event 
actually occurs.

Estimates of retirement costs are developed for each property based on numerous factors, such as the scope of the 
dismantlement, timing of settlement, interpretation of legal, regulatory and contractual requirements, type of production and 
processing structures, depth of water (if applicable), reservoir characteristics, depth of the reservoir, market demand for 
equipment, currently available dismantlement and restoration procedures and consultations with construction and engineering 
professionals.  Currency exchange rates, inflation rates and credit-adjusted-risk-free interest rates are then applied to estimate 
the fair values of the obligations.  To the extent these or other assumptions change after initial recognition of the liability, the 
fair value estimate is revised and the recognized liability adjusted, with a corresponding adjustment made to the related asset 
balance or income statement, as appropriate.  Changes in estimated asset retirement obligations for late life assets could result 
in impairment or in the recognition of income.  During 2018 we made revisions to these estimates and reduced our recognized 
liability by $204 million.  This downward revision was primarily due to the acceleration of our U.K. abandonment activities to 
capture favorable market conditions and lower estimated abandonment costs. See Item 8. Financial Statements and 
Supplementary Data – Note 12 to the consolidated financial statements for disclosures regarding our asset retirement obligation 
estimates.

44

An estimate of the sensitivity to net income if other assumptions had been used in recording these liabilities is not practical 

because of the number of obligations that must be assessed, the number of underlying assumptions and the wide range of 
possible assumptions.

Fair Value Estimates

Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between 
market participants at the measurement date.  There are three approaches for measuring the fair value of assets and liabilities:  
the market approach, the income approach and the cost approach, each of which includes multiple valuation techniques.  The 
market approach uses prices and other relevant information generated by market transactions involving identical or comparable 
assets or liabilities.  The income approach uses valuation techniques to measure fair value by converting future amounts, such 
as cash flows or earnings, into a single present value, or range of present values, using current market expectations about those 
future amounts.  The cost approach is based on the amount that would currently be required to replace the service capacity of an 
asset.  This is often referred to as current replacement cost.  The cost approach assumes that the fair value would not exceed 
what it would cost a market participant to acquire or construct a substitute asset of comparable utility, adjusted for 
obsolescence.

The fair value accounting standards do not prescribe which valuation technique should be used when measuring fair value 

and do not prioritize among the techniques.  These standards establish a fair value hierarchy that prioritizes the inputs used in 
applying the various valuation techniques.  Inputs broadly refer to the assumptions that market participants use to make pricing 
decisions, including assumptions about risk.  Level 1 inputs are given the highest priority in the fair value hierarchy while Level 
3 inputs are given the lowest priority.  The three levels of the fair value hierarchy are as follows:

•  Level 1 – Observable inputs that reflect unadjusted quoted prices for identical assets or liabilities in active markets as of 

the measurement date.  Active markets are those in which transactions for the asset or liability occur in sufficient 
frequency and volume to provide pricing information on an ongoing basis.

•  Level 2 – Observable market-based inputs or unobservable inputs that are corroborated by market data.  These are inputs 
other than quoted prices in active markets included in Level 1, which are either directly or indirectly observable as of the 
measurement date.

•  Level 3 – Unobservable inputs that are not corroborated by market data and may be used with internally developed 

methodologies that result in management’s best estimate of fair value.

Valuation techniques that maximize the use of observable inputs are favored.  Assets and liabilities are classified in their 

entirety based on the lowest priority level of input that is significant to the fair value measurement.  The assessment of the 
significance of a particular input to the fair value measurement requires judgment and may affect the placement of assets and 
liabilities within the levels of the fair value hierarchy.  See Item 8. Financial Statements and Supplementary Data – Note 15 to 
the consolidated financial statements for disclosures regarding our fair value measurements.

Significant uses of fair value measurements include:

• 

• 

• 

impairment assessments of long-lived assets;

impairment assessments of goodwill; and

recorded value of derivative instruments.

The need to test long-lived assets and goodwill for impairment can be based on several indicators, including a significant 
reduction in prices of crude oil and condensate, NGLs and natural gas, sustained declines in our common stock, reductions to 
our Capital Budget, unfavorable adjustments to reserves, significant changes in the expected timing of production, other 
changes to contracts or changes in the regulatory environment in which the property is located.

Impairment Assessments of Long-Lived Assets 

Long-lived assets in use are assessed for impairment whenever changes in facts and circumstances indicate that the 

carrying value of the assets may not be recoverable.  For purposes of an impairment evaluation, long-lived assets must be 
grouped at the lowest level for which independent cash flows can be identified, which generally is field-by-field or, in certain 
instances, by logical grouping of assets if there is significant shared infrastructure or contractual terms that cause economic 
interdependency amongst separate, discrete fields.  If the sum of the undiscounted estimated cash flows from the use of the 
asset group and its eventual disposition is less than the carrying value of an asset group, the carrying value is written down to 
the estimated fair value.  During 2018 the anticipated sales of certain non-core proved properties in our International and United 
States segments triggered an assessment of certain of our long-lived assets related to oil and gas producing properties for 
impairment.  We estimated the fair values using a market approach, based upon anticipated sales proceeds less costs to sell, and 
recognized impairments.  As of December 31, 2018 our estimated undiscounted cash flows relating to our remaining long-lived 
assets significantly exceeded their carrying values in our core assets.  Long-lived assets most at risk for future impairment had 

45

an estimated carrying value of less than $50 million. See Item 8. Financial Statements and Supplementary Data Note 11 and 
Note 15  to the consolidated financial statements for discussion of impairments recorded in 2018, 2017 and 2016 and the related 
fair value measurements. 

Fair value calculated for the purpose of testing our long-lived assets for impairment is estimated using the present value of 

expected future cash flows method and comparative market prices when appropriate.  Significant judgment is involved in 
performing these fair value estimates since the results are based on forecasted assumptions.  Significant assumptions include:

•  Future crude oil and condensate, NGLs and natural gas prices.  Our estimates of future prices are based on our analysis 
of market supply and demand and consideration of market price indicators.  Although these commodity prices may 
experience extreme volatility in any given year, we believe long-term industry prices are driven by global market supply 
and demand.  To estimate supply, we consider numerous factors, including the worldwide resource base, depletion rates 
and OPEC production policies.  We believe demand is largely driven by global economic factors, such as population and 
income growth, governmental policies and vehicle stocks.  The prices we use in our fair value estimates are consistent 
with those used in our planning and capital investment reviews.  There has been significant volatility in crude oil and 
condensate, NGLs and natural gas prices and estimates of such future prices are inherently imprecise. See Item 1A. Risk 
Factors for further discussion on commodity prices.

•  Estimated quantities of crude oil and condensate, NGLs and natural gas.  Such quantities are based on a combination of 

proved reserves and risk-weighted probable reserves and resources such that the combined volumes represent the most 
likely expectation of recovery.  See Item 1A. Risk Factors for further discussion on reserves.

•  Expected timing of production.  Production forecasts are the outcome of engineering studies which estimate reserves, as 
well as expected capital programs.  The actual timing of the production could be different than the projection.  Cash 
flows realized later in the projection period are less valuable than those realized earlier due to the time value of money.  
The expected timing of production that we use in our fair value estimates is consistent with that used in our planning and 
capital investment reviews.

•  Discount rate commensurate with the risks involved.  We apply a discount rate to our expected cash flows based on a 

variety of factors, including market and economic conditions, operational risk, regulatory risk and political risk.  A higher 
discount rate decreases the net present value of cash flows. 

•  Future capital requirements.  Our estimates of future capital requirements are based upon a combination of authorized 

spending and internal forecasts.

We base our fair value estimates on projected financial information which we believe to be reasonably likely to occur.  An 

estimate of the sensitivity to changes in assumptions in our undiscounted cash flow calculations is not practicable, given the 
numerous assumptions (e.g. reserves, pace and timing of development plans, commodity prices, capital expenditures, operating 
costs, drilling and development costs, inflation and discount rates) that can materially affect our estimates.  Unfavorable 
adjustments to some of the above listed assumptions would likely be offset by favorable adjustments in other assumptions.  For 
example, the impact of sustained reduced commodity prices on future undiscounted cash flows would likely be partially offset 
by lower costs.

Impairment Assessments of Goodwill

Goodwill is tested for impairment on an annual basis, or between annual tests when events or changes in circumstances 
indicate the fair value may have been reduced below its carrying value.  Goodwill is tested for impairment at the reporting unit 
level.  Our reporting units are the same as our reporting segments, of which only International includes goodwill.  As of 
December 31, 2018, our consolidated balance sheet included goodwill of $97 million.   Determining the fair value of a 
reporting unit requires judgment and the use of significant estimates and assumptions.  We first assess the qualitative factors in 
order to determine whether the fair value of our International reporting unit is more likely than not less than its carrying 
amount.  Certain qualitative factors used in our evaluation include, among other things, the results of the most recent 
quantitative assessment of the goodwill impairment test, macroeconomic conditions; industry and market conditions (including 
commodity prices and cost factors); overall financial performance; and other relevant entity-specific events.  If, after 
considering these events and circumstances we determined that it is more likely than not that the fair value of the International 
reporting unit is less than its carrying amount, a quantitative goodwill test is performed.  The quantitative goodwill test is 
performed using a combination of market and income approaches.  The market approach references observable inputs specific 
to us and our industry, such as the price of our common equity, our enterprise value, and valuation multiples of us and our peers 
from the investor analyst community.  The income approach utilizes discounted cash flows, which are based on forecasted 
assumptions.  Key assumptions to the income approach are the same as those described above regarding our impairment 
assessment of long lived assets and are consistent with those that management uses to make business decisions.

46

 
During the second quarter of 2018, we performed our annual impairment test of goodwill using the qualitative assessment. 
Our qualitative assessment considered the significant excess fair value over carrying value in our most recent step 1 test (second 
quarter 2017) and noted a general improvement in the qualitative factors above.  After assessing the totality of the qualitative 
factors which could have a positive or negative impact on goodwill, our assessment did not indicate that it is more likely than 
not that the fair value is less than its carrying value.  As a result, we concluded that no impairment to goodwill was required for 
our International reporting unit.  We believe the estimates and assumptions used in our impairment assessments are reasonable 
and based on available market information, but variations in such assumptions could result in materially different calculations 
of fair value and determinations of whether or not an impairment is indicated.  See Item 8. Financial Statements and 
Supplementary Data Note 13 to the consolidated financial statements for additional discussion of goodwill. 

Derivatives

We record all derivative instruments at fair value.  Fair value measurements for all our derivative instruments are based on 

observable market-based inputs that are corroborated by market data and are discussed in Item 8. Financial Statements and 
Supplementary Data – Note 14 to the consolidated financial statements.  Additional information about derivatives and their 
valuation may be found in Item 7A. Quantitative and Qualitative Disclosures About Market Risk.  

Income Taxes

We are subject to income taxes in numerous taxing jurisdictions worldwide.  Estimates of income taxes to be recorded 
involve interpretation of complex tax laws and assessment of the effects of foreign taxes on our U.S. federal income taxes. 

Uncertainty exists regarding tax positions taken in previously filed tax returns which remain subject to examination, along 

with positions expected to be taken in future returns. We provide for unrecognized tax benefits, based on the technical merits, 
when it is more likely than not that an uncertain tax position will not be sustained upon examination. Adjustments are made to 
the uncertain tax positions when facts and circumstances change, such as the closing of a tax audit; court proceedings; changes 
in applicable tax laws, including tax case rulings and legislative guidance; or expiration of the applicable statute of limitations.

We have recorded deferred tax assets and liabilities, measured at enacted tax rates, for temporary differences between book 

basis and tax basis, tax credit carryforwards and operating loss carryforwards.  In accordance with U.S. GAAP accounting 
standards, we routinely assess the realizability of our deferred tax assets and reduce such assets, to the expected realizable 
amount, by a valuation allowance if it is more likely than not that some portion or all of the deferred tax assets will not be 
realized.  In assessing the need for additional or adjustments to existing valuation allowances, we consider all available positive 
and negative evidence. Positive evidence includes reversals of temporary differences, forecasts of future taxable income, 
assessment of future business assumptions and applicable tax planning strategies that are prudent and feasible. Negative 
evidence includes losses in recent years as well as the forecasts of future income (loss) in the realizable period.  In making our 
assessment regarding valuation allowances, we weight the evidence based on objectivity.

We base our future taxable income estimates on projected financial information which we believe to be reasonably likely to 
occur.  Numerous judgments and assumptions are inherent in the estimation of future taxable income, including factors such as 
future operating conditions and the assessment of the effects of foreign taxes on our U.S. federal income taxes.  Future 
operating conditions can be affected by numerous factors, including (i) future crude oil and condensate, NGLs and natural gas 
prices, (ii) estimated quantities of crude oil and condensate, NGLs and natural gas, (iii) expected timing of production, and (iv) 
future capital requirements.  These assumptions are described in further detail above regarding our impairment assessment of 
long-lived assets. An estimate of the sensitivity to changes in assumptions resulting in future taxable income calculations is not 
practicable, given the numerous assumptions that can materially affect our estimates.  Unfavorable adjustments to some of the 
above listed assumptions would likely be offset by favorable adjustments in other assumptions.  For example, the impact of 
sustained reduced commodity prices on future taxable income would likely be partially offset by lower capital expenditures.

Based on the assumptions and judgments described above, as of December 31, 2018, we reflect a valuation allowance in 
our consolidated balance sheet of $749 million against our gross deferred tax assets of $2.0 billion in various jurisdictions in 
which we operate.  Our gross deferred tax assets consist primarily of federal U.S. operating loss carryforwards of $655 million, 
which will expire in 2035 - 2037, and $472 million in 2018 which can be carried forward indefinitely.  Since December 31, 
2016, we have maintained a full valuation allowance on our net federal deferred tax assets.  If objective negative evidence in 
the form of cumulative losses are no longer present and additional weight is given to subjective evidence such as forecasted 
projections of taxable income in future years, we would adjust the amount of the federal deferred tax assets considered 
realizable and reduce the provision for income taxes in the period of adjustment. See Item 8. Financial Statements and 
Supplementary Data – Note 8 to the consolidated financial statements for further detail. 

47

Pension and Other Postretirement Benefit Obligations

Accounting for pension and other postretirement benefit obligations involves numerous assumptions, the most significant 

of which relate to the following:

• 

• 

• 

the discount rate for measuring the present value of future plan obligations;

the expected long-term return on plan assets;

the rate of future increases in compensation levels; and

We develop our demographics and utilize the work of third-party actuaries to assist in the measurement of these 

obligations. We have selected different discount rates for our U.S. pension plans and our other U.S. postretirement benefit plans 
due to the different projected benefit payment patterns.  In determining the assumed discount rates, our methods include a 
review of market yields on high-quality corporate debt and use of our third-party actuary's discount rate model.  This model 
calculates an equivalent single discount rate for the projected benefit plan cash flows using a yield curve derived from bond 
yields.  The yield curve represents a series of annualized individual spot discount rates from 0.5 to 99 years.  The bonds used 
are rated AA or higher by a recognized rating agency, only non-callable bonds are included and outlier bonds (bonds that have a 
yield to maturity that significantly deviates from the average yield within each maturity grouping) are removed.  Each issue is 
required to have at least $300 million par value outstanding.  The constructed yield curve is based on those bonds representing 
the 50% highest yielding issuances within each defined maturity group.

Of the assumptions used to measure obligations and estimated annual net periodic benefit cost as of December 31, 2018 the 

discount rate has the most significant effect on the periodic benefit cost reported for the plans.  The hypothetical impacts of a 
0.25% change in the discount rates of 4.26% for our U.S. pension plans and 4.09% for our other U.S. postretirement benefit 
plans is summarized in the table below:

(In millions)

Impact of a 0.25% Increase in
Discount Rate

Impact of a 0.25% Decrease in
Discount Rate

Obligation

Expense

Obligation

Expense

U.S. pension plans
Other U.S. postretirement benefit plans

$
$

(3) $
(1) $

— $
— $

3
1

$
$

—
—

The asset rate of return assumption for the funded U.S. plan considers the plan's asset mix (currently targeted at 

approximately 55% equity and 45% other fixed income securities), past performance and other factors.  Certain components of 
the asset mix are modeled with various assumptions regarding inflation, debt returns and stock yields.  Decreasing the 6.50% 
asset rate of return assumption by 0.25% would not have a significant impact on our defined benefit pension expense. 

Compensation change assumptions are based on historical experience, anticipated future management actions and 
demographics of the benefit plans.  Health care cost trend assumptions are developed based on historical cost data, the near-
term outlook and an assessment of likely long-term trends.

Item 8. Financial Statements and Supplementary Data – Note 18 to the consolidated financial statements includes detailed 

information about the assumptions used to calculate the components of our annual defined benefit pension and other 
postretirement plan expense, as well as the obligations and accumulated other comprehensive income reported on the 
consolidated balance sheets.

Contingent Liabilities

We accrue contingent liabilities for environmental remediation, tax deficiencies related to operating taxes, as well as tax 
disputes and litigation claims when such contingencies are probable and estimable.  Actual costs can differ from estimates for 
many reasons.  For instance, settlement costs for claims and litigation can vary from estimates based on differing interpretations 
of laws, opinions on responsibility and assessments of the amount of damages.  Similarly, liabilities for environmental 
remediation may vary from estimates because of changes in laws, regulations and their interpretation, additional information on 
the extent and nature of site contamination and improvements in technology.  Our in-house legal counsel regularly assesses 
these contingent liabilities.  In certain circumstances outside legal counsel is utilized.

We generally record losses related to these types of contingencies as other operating expense or general and administrative 
expense in the consolidated statements of income, except for tax contingencies unrelated to income taxes, which are recorded as 
taxes other than income.  For additional information on contingent liabilities, see Item 7. Management’s Discussion and 
Analysis of Financial Condition and Results of Operations – Management’s Discussion and Analysis of Environmental 
Matters, Litigation and Contingencies.

48

An estimate of the sensitivity to net income if other assumptions had been used in recording these liabilities is not practical 

because of the number of contingencies that must be assessed, the number of underlying assumptions and the wide range of 
reasonably possible outcomes, in terms of both the probability of loss and the estimates of such loss.

Accounting Standards Not Yet Adopted

See Item 8. Financial Statements and Supplementary Data – Note 2 to the consolidated financial statements.

49

Item 7A. Quantitative and Qualitative Disclosures About Market Risk

We are exposed to market risks related to the volatility of crude oil and condensate, NGLs, and natural gas prices as the 
volatility of these prices continues to impact our industry.  We expect commodity prices to remain volatile and unpredictable in 
the future, we are also exposed to market risks related to changes in interest rates.  We employ various strategies, including the 
use of financial derivative instruments, to manage the risks related to commodity price fluctuations.  We are at risk for changes 
in the fair value of all of our derivative instruments; however, such risk should be mitigated by price changes related to the 
underlying commodity or financial transaction.  While the use of derivative instruments could materially affect our results of 
operations in particular quarterly or annual periods, we believe that the use of these instruments will not have a material adverse 
effect on our financial position or liquidity.

See Item 8. Financial Statements and Supplementary Data – Note 14 and Note 15 to the consolidated financial statements 

for more information about the fair value measurement of our derivatives, the amounts recorded in our consolidated balance 
sheets and statements of income and the related notional amounts.

Commodity Price Risk

Our strategy is to obtain competitive prices for our products and allow operating results to reflect market price movements 
dictated by supply and demand.  However, management will periodically protect prices on forecasted sales to support cash flow 
and liquidity, as deemed appropriate.  We may use a variety of commodity derivative instruments, including futures, forwards, 
swaps and combinations of options, as part of an overall program to manage commodity price risk in our business.  Our 
consolidated results for 2018, 2017 and 2016 were impacted by crude oil and natural gas derivatives related to a portion of our 
forecasted United States sales. 

As of December 31, 2018, we had various open commodity derivatives related to crude oil and natural gas with a net asset 

position of $127 million.  Based on the December 31, 2018, published NYMEX WTI and Henry Hub futures prices, a 
hypothetical 10% change (per bbl for crude oil and per MMBtu for natural gas) increases (decreases) the fair values of our net 
commodity derivative open positions as follows: 

(In millions)

Crude oil derivatives

Natural gas derivatives

       Total

Interest Rate Risk

Hypothetical Price
Increase of 10%

Hypothetical Price
Decrease of 10%

$

$

(30) $
(1)
(31) $

19

1

20

At December 31, 2018, our portfolio of long-term debt is comprised of fixed-rate instruments with an outstanding balance 

of $5.5 billion.  Our sensitivity to interest rate movements and corresponding changes in the fair value of our fixed-rate debt 
portfolio affects our results of operations and cash flows only when we elect to repurchase or otherwise retire fixed-rate debt at 
prices different than carrying value. 

Counterparty Risk

We are also exposed to financial risk in the event of nonperformance by counterparties.  If commodity prices fall below 

current levels, some of our counterparties may experience liquidity problems and may not be able to meet their financial 
obligations to us. We review the creditworthiness of counterparties and use master netting agreements when appropriate.  

50

Item 8. Financial Statements and Supplementary Data

Index

Management’s Responsibilities for Financial Statements

Management’s Report on Internal Control over Financial Reporting

Report of Independent Registered Public Accounting Firm

Audited Consolidated Financial Statements

Consolidated Statements of Income

Consolidated Statements of Comprehensive Income

Consolidated Balance Sheets

Consolidated Statements of Cash Flows

Consolidated Statements of Stockholders’ Equity

Notes to Consolidated Financial Statements

Select Quarterly Financial Data (Unaudited)

Supplementary Information on Oil and Gas Producing Activities (Unaudited)

Page

52

52

53

55

56

57

58

59

60

100

101

51

 
Management’s Responsibilities for Financial Statements

To the Stockholders of Marathon Oil Corporation:

The accompanying consolidated financial statements of Marathon Oil Corporation and its consolidated subsidiaries 
("Marathon Oil") are the responsibility of management and have been prepared in conformity with accounting principles 
generally accepted in the United States.  They necessarily include some amounts that are based on best judgments and 
estimates.  The financial information displayed in other sections of this Annual Report on Form 10-K is consistent with these 
consolidated financial statements.

Marathon Oil seeks to assure the objectivity and integrity of its financial records by careful selection of its managers, by 
organization arrangements that provide an appropriate division of responsibility and by communications programs aimed at 
assuring that its policies and methods are understood throughout the organization.

The Board of Directors pursues its oversight role in the area of financial reporting and internal control over financial 

reporting through its Audit and Finance Committee.  This Committee, composed solely of independent directors, regularly 
meets (jointly and separately) with the independent registered public accounting firm, management and internal auditors to 
monitor the proper discharge by each of their responsibilities relative to internal accounting controls and the consolidated 
financial statements.

/s/ Lee M. Tillman

Chairman, President and Chief Executive 
Officer

/s/  Dane E. Whitehead
Executive Vice President and Chief Financial Officer

Management’s Report on Internal Control over Financial Reporting

To the Stockholders of Marathon Oil Corporation:

Marathon Oil’s management is responsible for establishing and maintaining adequate internal control over financial 
reporting (as defined in Rules 13(a) – 15(f) under the Securities Exchange Act of 1934).  Our internal control over financial 
reporting is designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of the 
consolidated financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements and 
even when determined to be effective, can only provide reasonable assurance with respect to financial statement preparation 
and presentation. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may 
become inadequate because of changes in conditions or that the degree of compliance with the policies or procedures may 
deteriorate.

An evaluation of the design and effectiveness of our internal control over financial reporting, based on the 2013 framework 

in Internal Control – Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway 
Commission, was conducted under the supervision and with the participation of management, including our Chief Executive 
Officer and Chief Financial Officer.  Based on the results of this evaluation, Marathon Oil’s management concluded that its 
internal control over financial reporting was effective as of December 31, 2018.

The effectiveness of Marathon Oil’s internal control over financial reporting as of December 31, 2018 has been audited by 

PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which is included 
herein.

/s/ Lee M. Tillman
Chairman, President and Chief Executive 
Officer

/s/  Dane E. Whitehead
Executive Vice President and Chief Financial Officer

52

 
  
  
  
  
  
  
  
  
Report of Independent Registered Public Accounting Firm 

To the Board of Directors and Stockholders of Marathon Oil Corporation:

Opinions on the Financial Statements and Internal Control over Financial Reporting

We have audited the accompanying consolidated balance sheets of Marathon Oil Corporation and its subsidiaries (the 
"Company") as of December 31, 2018 and 2017, and the related consolidated statements of income, comprehensive income, 
cash flows and stockholders’ equity for each of the three years in the period ended December 31, 2018, including the related 
notes (collectively referred to as the “consolidated financial statements”).  We also have audited the Company's internal control 
over financial reporting as of December 31, 2018, based on criteria established in Internal Control - Integrated Framework 
(2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).  

In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial 
position of the Company as of December 31, 2018 and 2017, and the results of its operations and its cash flows for each of the 
three years in the period ended December 31, 2018 in conformity with accounting principles generally accepted in the United 
States of America.  Also in our opinion, the Company maintained, in all material respects, effective internal control over 
financial reporting as of December 31, 2018, based on criteria established in Internal Control - Integrated Framework (2013) 
issued by the COSO.

Basis for Opinions

The Company's management is responsible for these consolidated financial statements, for maintaining effective internal 

control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting, included 
in the accompanying Management's Report on Internal Control over Financial Reporting.  Our responsibility is to express 
opinions on the Company’s consolidated financial statements and on the Company's internal control over financial reporting 
based on our audits.  We are a public accounting firm registered with the Public Company Accounting Oversight Board (United 
States) (PCAOB) and are required to be independent with respect to the Company in accordance with the U.S. federal securities 
laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB.  Those standards require that we plan and 
perform the audits to obtain reasonable assurance about whether the consolidated financial statements are free of material 
misstatement, whether due to error or fraud, and whether effective internal control over financial reporting was maintained in 
all material respects.  

Our audits of the consolidated financial statements included performing procedures to assess the risks of material 

misstatement of the consolidated financial statements, whether due to error or fraud, and performing procedures that respond to 
those risks.  Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the 
consolidated financial statements.  Our audits also included evaluating the accounting principles used and significant estimates 
made by management, as well as evaluating the overall presentation of the consolidated financial statements.  Our audit of 
internal control over financial reporting included obtaining an understanding of internal control over financial reporting, 
assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal 
control based on the assessed risk.  Our audits also included performing such other procedures as we considered necessary in 
the circumstances. We believe that our audits provide a reasonable basis for our opinions.

53

Definition and Limitations of Internal Control over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the 
reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally 
accepted accounting principles.  A company’s internal control over financial reporting includes those policies and procedures 
that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and 
dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit 
preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and 
expenditures of the company are being made only in accordance with authorizations of management and directors of the 
company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or 
disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements.  Also, 

projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate 
because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/PricewaterhouseCoopers LLP

Houston, Texas
February 21, 2019 

We have served as the Company’s auditor since 1982. 

54

MARATHON OIL CORPORATION
Consolidated Statements of Income

(In millions, except per share data)
Revenues and other income:

Revenues from contracts with customers
Net gain (loss) on commodity derivatives
Marketing revenues
Income from equity method investments
Net gain (loss) on disposal of assets
Other income

Total revenues and other income

Costs and expenses:

Production
Marketing, including purchases from related parties
Shipping, handling and other operating
Exploration
Depreciation, depletion and amortization
Impairments
Taxes other than income
General and administrative
Total costs and expenses
Income (loss) from operations

Net interest and other
Other net periodic benefit costs
Loss on early extinguishment of debt

Income (loss) from continuing operations before income taxes

Provision (benefit) for income taxes

Income (loss) from continuing operations
Income (loss) from discontinued operations
Net income (loss)
Per basic share:

Income (loss) from continuing operations
Income (loss) from discontinued operations
Net income (loss)

Per diluted share:

Income (loss) from continuing operations
Income (loss) from discontinued operations
Net income (loss)

Weighted average common shares outstanding:

Basic
Diluted

$

$

$
$
$

$
$
$

Year Ended December 31,
2017

2016

2018

5,902
(14)
—
225
319
150
6,582

842
—
575
289
2,441
75
299
394
4,915
1,667
(226)
(14)
—
1,427
331
1,096
—
1,096

$

$

1.30

$
— $
$

1.30

1.29

$
— $
$

1.29

846
847

$

4,247
(36)
162
256
58
78
4,765

716
168
431
409
2,372
229
183
371
4,879
(114)
(270)
(19)
(51)
(454)
376
(830)
(4,893)
(5,723) $

(0.97) $
(5.76) $
(6.73) $

(0.97) $
(5.76) $
(6.73) $

850
850

2,996
(66)
240
175
389
53
3,787

720
245
484
323
2,156
67
151
371
4,517
(730)
(332)
(102)
—
(1,164)
923
(2,087)
(53)
(2,140)

(2.55)
(0.06)
(2.61)

(2.55)
(0.06)
(2.61)

819
819

The accompanying notes are an integral part of these consolidated financial statements.

55

 
MARATHON OIL CORPORATION
Consolidated Statements of Comprehensive Income

(In millions)
Net income (loss)

Other comprehensive income (loss)

Postretirement and postemployment plans:

Change in actuarial loss and other
Income tax provision (benefit)

Postretirement and postemployment plans, net of tax

Derivative hedges:

Net unrecognized gain (loss)
Reclassification of gains on terminated derivative hedges
Income tax provision (benefit)

Derivative hedges, net of tax

Foreign currency hedges:
   Net recognized loss reclassified to discontinued operations
   Income tax provision (benefit)

Foreign currency hedges, net of tax

Other, net of tax

Other comprehensive income (loss)

Comprehensive income (loss)

Year Ended December 31,

2018

2017

2016

$

1,096

$

(5,723) $

(2,140)

117
4
121

—
—
—
—

21
7
28

(13)
(47)
21
(39)

—
—
—
4
125
1,221

$

34
(4)
30
2
21
(5,702) $

$

16
(4)
12

61
—
(22)
39

—
—
—
1
52
(2,088)

The accompanying notes are an integral part of these consolidated financial statements.

56

 
 
MARATHON OIL CORPORATION
Consolidated Balance Sheets

(In millions, except par values and share amounts)
Assets
Current assets:

Cash and cash equivalents
Receivables, less reserve of $11 and $12
Notes receivable
Inventories
Other current assets
Current assets held for sale

Total current assets
Equity method investments
Property, plant and equipment, less accumulated depreciation, depletion and amortization of
$21,830 and $21,564
Goodwill
Other noncurrent assets
Noncurrent assets held for sale

Total assets

Liabilities
Current liabilities:
Accounts payable
Payroll and benefits payable
Accrued taxes
Other current liabilities
Current liabilities held for sale

Total current liabilities

Long-term debt
Deferred tax liabilities
Defined benefit postretirement plan obligations
Asset retirement obligations
Deferred credits and other liabilities
Noncurrent liabilities held for sale

Total liabilities

Commitments and contingencies
Stockholders’ Equity
Preferred stock - no shares issued or outstanding (no par value, 26 million shares authorized)
Common stock:

Issued – 937 million shares and 937 million shares (par value $1 per share, 1.925 billion
shares authorized at December 31, 2018 and 1.1 billion shares authorized at
December 31, 2017)
Held in treasury, at cost – 118 million shares and 87 million shares

Additional paid-in capital
Retained earnings
Accumulated other comprehensive income (loss)

Total stockholders' equity
Total liabilities and stockholders' equity

The accompanying notes are an integral part of these consolidated financial statements.

57

December 31,

2018

2017

$

$

$

1,462
1,079
—
96
257
27
2,921
745

16,804
97
723
31
21,321

1,320
154
181
170
7
1,832
5,499
199
195
1,081
279
108
9,193

563
1,082
748
126
36
11
2,566
847

17,665
115
764
55
22,012

1,395
108
177
288
—
1,968
5,494
833
362
1,428
217
2
10,304

—

—

937
(3,816)
7,238
7,706
63
12,128
21,321

$

937
(3,325)
7,379
6,779
(62)
11,708
22,012

$

$

$

$

 
 
MARATHON OIL CORPORATION
Consolidated Statements of Cash Flows

(In millions)
Increase (decrease) in cash and cash equivalents
Operating activities:
Net income (loss)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:

Year Ended December 31,
2016
2017

2018

$

1,096

$ (5,723) $ (2,140)

Discontinued operations
Depreciation, depletion and amortization
Impairments
Exploratory dry well costs and unproved property impairments
Net (gain) loss on disposal of assets
Deferred income taxes
Net (gain) loss on derivative instruments
Net settlements of derivative instruments
Pension and other post retirement benefits, net
Stock-based compensation
Equity method investments, net
Changes in:

Current receivables
Inventories
Current accounts payable and accrued liabilities
Other current assets and liabilities

All other operating, net

Net cash provided by operating activities from continuing operations

Investing activities:

Additions to property, plant and equipment
Additions to other assets
Acquisitions, net of cash acquired
Disposal of assets, net of cash transferred to the buyer
Equity method investments - return of capital
All other investing, net

Net cash used in investing activities from continuing operations

Financing activities:

Borrowings
Debt repayments
Debt extinguishment costs
Common stock issuance
Purchases of common stock
Dividends paid
All other financing, net

Net cash provided by (used in) financing activities

Net increase in cash and cash equivalents of discontinued operations (Note 5)
Effect of exchange rate on cash and cash equivalents
Cash held for sale
Net increase (decrease) in cash and cash equivalents
Cash and cash equivalents at beginning of period
Cash and cash equivalents at end of period

$

The accompanying notes are an integral part of these consolidated financial statements.

58

—
2,441
75
255
(319)
52
14
(281)
(65)
53
45

(133)
(1)
179
(22)
(155)
3,234

(2,753)
(26)
(25)
1,264
57
13
(1,470)

—
—
—
—
(713)
(169)
23
(859)
—
(2)
(4)
899
563
1,462

$

4,893
2,372
229
323
(58)
(61)
36
45
(46)
49
20

(334)
10
297
1
(65)
1,988

(1,974)
(25)
(1,891)
1,787
64
(5)
(2,044)

988
(2,764)
(46)
—
(11)
(170)
—
(2,003)
130
4
—
(1,925)
2,488
563

$

53
2,156
67
220
(389)
828
66
44
(3)
51
17

67
64
(137)
33
(96)
901

(1,204)
—
(902)
1,219
55
(1)
(833)

—
(1)
—
1,236
(6)
(162)
1
1,068
238
(3)
(2)
1,369
1,119
2,488

 
 
 
 
 
MARATHON OIL CORPORATION
Consolidated Statements of Stockholders’ Equity

Total Equity of Marathon Oil Stockholders

(In millions)

Preferred
Stock

Common
Stock

Treasury
Stock

Additional
Paid-in
Capital

Retained
Earnings

December 31, 2015 Balance

$

— $

770

$

(3,554) $

6,498

$

14,974

Accumulated
Other
Comprehensive
Income (Loss)
$

(135) $

Total
Equity

18,553

Shares issued - stock-based

compensation

Shares repurchased

Stock-based compensation

Net loss

Other comprehensive income

Dividends paid ($0.20 per share)

Common stock issuance

—

—

—

—

—

—

—

December 31, 2016 Balance

$

— $

Shares issued - stock-based

compensation

Shares repurchased

Stock-based compensation

Net loss

Other comprehensive income

Dividends paid ($0.20 per share)

Common stock issuance

December 31, 2017 Balance

Shares issued - stock-based

compensation

Shares repurchased

Stock-based compensation

Net income

Other comprehensive income

Dividends paid ($0.20 per share)

—

—

—

—

—

—

167

937

—

—

—

—

—

—

—

128

(5)

—

—

—

—

—

(86)

—

(35)

—

—

—

1,069

—

—

—

(2,140)

—

(162)

—

—

—

—

—

52

—

—

$

(3,431) $

7,446

$

12,672

$

(83) $

117

(11)

—

—

—

—

—

(50)

—

(17)

—

—

—

—

—

—

—

(5,723)

—

(170)

—

—

—

—

—

21

—

—

42

(5)

(35)

(2,140)

52

(162)

1,236

17,541

67

(11)

(17)

(5,723)

21

(170)

—

—

—

—

—

—

—

—

$

— $

937

$

(3,325) $

7,379

$

6,779

$

(62) $

11,708

—

—

—

—

—

—

—

—

—

—

—

—

221

(712)

—

—

—

—

(109)

—

(32)

—

—

—

—

—

—

1,096

—

(169)

—

—

—

—

125

—

63

112

(712)

(32)

1,096

125

(169)

$

12,128

December 31, 2018 Balance

$

— $

937

$

(3,816) $

7,238

$

7,706

$

(Shares in millions)

December 31, 2015 Balance

Shares issued - stock-based

compensation

Common stock issuance
December 31, 2016 Balance

Shares issued - stock-based

compensation

December 31, 2017 Balance

Shares issued - stock-based

compensation

Shares repurchased

December 31, 2018 Balance

Preferred
Stock

Common
Stock

Treasury
Stock

—

—

—

—

—

—

—

—

—

770

—

167

937

—

937

—

—

937

93

(3)

—

90

(3)

87

(6)

37

118

The accompanying notes are an integral part of these consolidated financial statements.

59

 
 
 
 
 
 
 
 
 
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

1.    Summary of Principal Accounting Policies

We are an independent exploration and production company engaged in exploration, production and marketing of crude oil 
and condensate, NGLs and natural gas; as well as production and marketing of products manufactured from natural gas, such as 
LNG and methanol, in E.G.

Basis of presentation and principles applied in consolidation – These consolidated financial statements, including notes 

have been prepared in accordance with U.S. GAAP.  These consolidated financial statements include the accounts of our 
controlled subsidiaries.  Investments in unincorporated joint ventures and undivided interests in certain operating assets are 
consolidated on a pro rata basis.

During the year, we renamed our United States E&P and International E&P segments to the United States and International 

segments.  The characteristics and composition of these segments remained unchanged and there was no effect on previously 
reported segment information.  See Note 7 for further information on our reportable segments.

Equity method investments – Investments in entities over which we have significant influence, but not control, are 
accounted for using the equity method of accounting.  This includes entities in which we hold majority ownership but the 
minority stockholders have substantive participating rights in the investee.  Income from equity method investments represents 
our proportionate share of net income generated by the equity method investees and is reflected in revenue and other income in 
our consolidated statements of income.  Equity method investments are included as noncurrent assets on the consolidated 
balance sheet.

Equity method investments are assessed for impairment whenever changes in the facts and circumstances indicate a loss in 
value may have occurred. When a loss is deemed to have occurred and is other than temporary, the carrying value of the equity 
method investment is written down to fair value, and the amount of the write-down is included in income.  Differences in the 
basis of the investments and the separate net asset value of the investees, if any, are amortized into income over the remaining 
useful lives of the underlying assets, except for the excess related to goodwill.

Reclassifications – In the first quarter of 2018 we adopted the new Accounting Standards Codification ("ASC") Topic 606, 

Revenue from Contracts with Customers using the modified retrospective method.  To conform the historical presentation to 
our current presentation, we reclassified gains/losses arising from our commodity derivatives out of the revenues from contracts 
with customers line into a separate line, net gain (loss) on commodity derivatives, on the consolidated statements of income.  
Additionally, in the first quarter of 2018 we adopted the new pension accounting standards update on a retrospective basis, and 
reclassified the required cost elements from general and administrative expense into production expense, exploration expense, 
and other net periodic benefit costs.  See Note 2 for further discussion of the adoption of these accounting standards.  

Additionally, we have reclassified certain prior year amounts between operating cash flow categories to present it on a 

basis comparable with the current year's presentation with no impact on net cash provided by operating activities.

Discontinued operations – As a result of the sale of our Canadian business in 2017, we reflected this business as 

discontinued operations in all historical periods presented.  Disclosures in this report related to results of operations and cash 
flows are presented on the basis of continuing operations unless otherwise stated.  Assets and liabilities are presented as held for 
sale in the historical periods in the consolidated balance sheets.  See Note 5 for discussion of the divestiture in further detail.

Use of estimates – The preparation of financial statements in accordance with U.S. GAAP requires management to make 
estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and 
liabilities as of the date of the consolidated financial statements and the reported amounts of revenues and expenses during the 
respective reporting periods.

Estimated quantities of crude oil and condensate, NGLs and natural gas reserves is a significant estimate that requires 
judgment.  All of the reserve data included in this Form 10-K are estimates.  Reservoir engineering is a subjective process of 
estimating underground accumulations of crude oil and condensate, NGLs and natural gas.  There are numerous uncertainties 
inherent in estimating quantities of proved crude oil and condensate, NGLs and natural gas reserves.  The accuracy of any 
reserves estimate is a function of the quality of available data and of engineering and geological interpretation and judgment.  
As a result, reserve estimates may be different from the quantities of crude oil and condensate, NGLs and natural gas that are 
ultimately recovered.  See Supplementary Data - Supplementary Information on Oil and Gas Producing Activities for 
further detail.

Other items subject to estimates and assumptions include the carrying amounts of property, plant and equipment, asset 
retirement obligations, goodwill, valuation of derivative instruments and valuation allowances for deferred income tax assets, 
among others.  Although we believe these estimates are reasonable, actual results could differ from these estimates.

60

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

Foreign currency transactions – The U.S. dollar is the functional currency of our foreign operating subsidiaries.  Foreign 

currency transaction gains and losses are included in net income.

Revenue recognition – We recognize revenue at an amount that reflects the consideration to which we believe we are 
entitled in exchange for transferring goods and/or services to a customer.  In the lower 48 states of the U.S., production volumes 
of crude oil and condensate, NGLs and natural gas are generally sold immediately and transported to market.  In international 
locations, liquid hydrocarbon production volumes may be stored as inventory and sold at a later time. 

 See Note 6 for further discussion of the revenue recognition accounting policies.

Cash and cash equivalents – Cash and cash equivalents include cash on hand and on deposit and investments in highly 

liquid debt instruments with original maturities of three months or less.

Accounts receivable – The majority of our receivables are from joint interest owners in properties we operate or from 
purchasers of commodities, both of which are recorded at invoiced amounts and do not bear interest.  We often have the ability 
to withhold future revenue disbursements to recover any non-payment of joint interest billings.  We conduct credit reviews of 
commodity purchasers prior to making commodity sales to new customers or increasing credit for existing customers.  Based 
on these reviews, we may require a standby letter of credit or a financial guarantee.  We routinely assess the collectability of 
receivable balances to determine if the amount of the reserve in allowance for doubtful accounts is sufficient. 

Notes receivable – At closing of the sale of our Canadian business in 2017 we received two notes receivable for a 

combined $750 million, we received these proceeds in the first quarter of 2018.  Both notes receivable were initially recorded at 
fair value and were reported at amortized cost.  These notes receivable were evaluated for collectability on an individual basis 
each reporting period, based on the financial condition of the debtor.  See Note 5 for additional discussion.

Inventories – Crude oil and natural gas are recorded at weighted average cost and carried at the lower of cost or net 
realizable value. Supplies and other items consist principally of tubular goods and equipment which are valued at weighted 
average cost and reviewed periodically for obsolescence or impairment when market conditions indicate. 

We may enter into a contract to sell a particular quantity and quality of crude oil at a specified location and date to a 
particular counterparty, and simultaneously agree to buy a particular quantity and quality of the same commodity at a specified 
location on the same or another specified date from the same counterparty.  We account for such matching buy/sell 
arrangements as exchanges of inventory.

Derivative instruments – We may use derivatives to manage a portion of our exposure to commodity price risk, commodity 

locational risk, foreign currency risk and interest rate risk.  All derivative instruments are recorded at fair value.  Commodity 
derivatives and interest rate swaps are reflected on our consolidated balance sheet on a net basis by counterparty, as they are 
governed by master netting agreements.  Cash flows related to derivatives used to manage commodity price risk, foreign 
currency risk and interest rate risk are classified in operating activities.  Our derivative instruments contain no significant 
contingent credit features.

Fair value hedges – We may use interest rate swaps to manage our exposure to interest rate risk associated with fixed 
interest rate debt in our portfolio.  Changes in the fair values of both the hedged item and the related derivative are recognized 
immediately in net income with an offsetting effect included in the basis of the hedged item.  The net effect is to report in net 
income the extent to which the hedge is not effective in achieving offsetting changes in fair value.

Cash flow hedges – We may use interest rate derivative instruments to manage the risk of interest rate changes during the 

period prior to anticipated borrowings and designate them as cash flow hedges.  Derivative instruments designated as cash flow 
hedges are linked to specific assets and liabilities or to specific firm commitments or forecasted transactions. The effective 
portion of changes in the fair value of a qualifying cash flow hedge are recorded in other comprehensive income until the 
hedged item is reclassified to net income when the underlying forecasted transaction is recognized in net income. Ineffective 
portions of a cash flow hedge’s change in fair value are recognized currently within net interest and other on the consolidated 
statements of income. However, if it is determined that the likelihood of the original forecasted transaction occurring is no 
longer probable, the entire accumulated gain or loss recognized in other comprehensive income is immediately reclassified into 
net income.

Derivatives not designated as hedges – Derivatives that are not designated as hedges may include commodity derivatives 

used primarily to manage price and locational risks on the forecasted sale of crude oil and natural gas that we produce.  
Changes in the fair value of derivatives not designated as hedges are recognized immediately in net income.  

Concentrations of credit risk – All of our financial instruments, including derivatives, involve elements of credit and 
market risk. The most significant portion of our credit risk relates to nonperformance by counterparties.  The counterparties to 
our financial instruments consist primarily of major financial institutions and companies within the energy industry.  To manage 

61

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

counterparty risk associated with financial instruments, we select and monitor counterparties based on our assessment of their 
financial strength and on credit ratings, if available.  Additionally, we limit the level of exposure with any single counterparty.

Fair value transfer – We recognize transfers between levels of the fair value hierarchy as of the end of the reporting 

period.  If significant transfers occur, they would be disclosed in Note 15 to the consolidated financial statements.

Property, plant and equipment – We use the successful efforts method of accounting for oil and gas producing activities.

Property acquisition costs – Costs to acquire mineral interests in oil and natural gas properties, to drill exploratory wells in 
progress and those that find proved reserves, and to drill development wells are capitalized.  Costs to drill exploratory wells that 
do not find proved reserves, geological and geophysical costs and costs of carrying and retaining unproved properties are 
expensed.  Costs incurred for exploratory wells that find reserves but cannot yet be classified as proved are capitalized if (1) the 
well has found a sufficient quantity of reserves to justify its completion as a producing well and (2) we are making sufficient 
progress assessing the reserves and the economic and operating viability of the project.  The status of suspended exploratory 
well costs is monitored continuously and reviewed at least quarterly.

Depreciation, depletion and amortization – Capitalized costs to acquire oil and natural gas properties are depreciated and 

depleted on a units-of-production basis based on estimated proved reserves.  Capitalized costs of exploratory wells and 
development costs are depreciated and depleted on a units-of-production basis based on estimated proved developed reserves.  
Support equipment and other property, plant and equipment related to oil and gas producing activities, as well as property, plant 
and equipment unrelated to oil and gas producing activities, are recorded at cost and depreciated on a straight-line basis over the 
estimated useful lives of the assets as summarized below.

Type of Asset
Office furniture, equipment and computer hardware
Pipelines
Plants, facilities and infrastructure

Range of Useful Lives
4 to 15 years
10 to 40 years
3 to 40 years

Impairments – We evaluate our oil and gas producing properties, including capitalized costs of exploratory wells and 
development costs, for impairment of value whenever events or changes in circumstances indicate that the carrying amount of 
an asset may not be recoverable.  If the sum of the expected undiscounted future cash flows from the use of the asset and its 
eventual disposition is less than the carrying amount of the asset, an impairment loss is recognized based on the fair value of the 
asset.  Oil and gas producing properties are reviewed for impairment on a field-by-field basis or, in certain instances, by logical 
grouping of assets if there is significant shared infrastructure or contractual terms that cause economic interdependency 
amongst separate, discrete fields.  Oil and gas producing properties deemed to be impaired are written down to their fair value, 
as determined by discounted future net cash flows or, if available, comparable market value.  We evaluate our unproved 
property investment and record impairment based on time or geologic factors.  Information such as drilling results, reservoir 
performance, seismic interpretation or future plans to develop acreage is also considered.  When unproved property investments 
are deemed to be impaired, this amount is reported in exploration expenses in our consolidated statements of income.

Dispositions – When property, plant and equipment depreciated on an individual basis is sold or otherwise disposed of, any 

gains or losses are reflected in net gain (loss) on disposal of assets in our consolidated statements of income.  Gains on the 
disposal of property, plant and equipment are recognized when earned, which is generally at the time of closing.  If a loss on 
disposal is expected, such losses are recognized either when the assets are classified as held for sale, or are measured using a 
probability weighted income approach based on both the anticipated sales price and a held-for-use model depending on timing 
of the sale.  Proceeds from the disposal of property, plant and equipment depreciated on a group basis are credited to 
accumulated depreciation, depletion and amortization with no immediate effect on net income until net book value is reduced to 
zero.

Goodwill – Goodwill represents the excess of the purchase price over the estimated fair value of the net assets acquired in 
the acquisition of a business.  Such goodwill is not amortized, but rather is tested for impairment annually and when events or 
changes in circumstances indicate that the fair value of a reporting unit with goodwill has been reduced below carrying value.  
The impairment test requires allocating goodwill and other assets and liabilities to a reporting unit.  The fair value of a reporting 
unit is determined and compared to the book value of the reporting unit.  If the fair value of the reporting unit is less than the 
book value, including goodwill, then the recorded goodwill is impaired to its implied fair value with a charge to impairments.  

Major maintenance activities – Costs for planned major maintenance are expensed in the period incurred and can include 

the costs of contractor repair services, materials and supplies, equipment rentals and our labor costs.

62

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

Environmental costs – We provide for remediation costs and penalties when the responsibility to remediate is probable and 
the amount of associated costs can be reasonably estimated.  The timing of remediation accruals coincides with completion of a 
feasibility study or the commitment to a formal plan of action.  Remediation liabilities are accrued based on estimates of known 
environmental exposure and are discounted when the estimated amounts are reasonably fixed or reliably determinable.  
Environmental expenditures are capitalized only if the costs mitigate or prevent future contamination or if the costs improve the 
environmental safety or efficiency of the existing assets.

Asset retirement obligations – The fair value of asset retirement obligations is recognized in the period in which the 
obligations are incurred if a reasonable estimate of fair value can be made.  Our asset retirement obligations primarily relate to 
the abandonment of oil and gas producing facilities.  Asset retirement obligations for such facilities include costs to dismantle 
and relocate or dispose of production platforms, gathering systems, wells and related structures and restoration costs of land and 
seabed, including those leased.  Estimates of these costs are developed for each property based on the type of production 
facilities and equipment, depth of water, reservoir characteristics, depth of the reservoir, market demand for equipment, 
currently available procedures and consultations with construction and engineering professionals.

Inflation rates and credit-adjusted-risk-free interest rates are used to estimate the fair value of asset retirement obligations.  

Depreciation of capitalized asset retirement costs and accretion of asset retirement obligations are recorded over time.  
Depreciation is generally determined on a units-of-production basis based on estimated proved developed reserves for oil and 
gas production facilities, while accretion of the liability occurs over the useful lives of the assets.

 Deferred income taxes – Deferred tax assets and liabilities, measured at enacted tax rates, are recognized for the estimated 
future tax consequences attributable to differences between the financial statement carrying amounts of assets and liabilities and 
their tax bases as reported in our filings with the respective taxing authorities.  We routinely assess the realizability of our 
deferred tax assets based on several interrelated factors and reduce such assets by a valuation allowance if it is more likely than 
not that some portion or all of the deferred tax assets will not be realized.  These factors include whether we are in a cumulative 
loss position in recent years, our reversal of temporary differences, and our expectation to generate sufficient future taxable 
income.  We use the liability method in determining our provision and liabilities for our income taxes, under which current and 
deferred tax liabilities and assets are recorded in accordance with enacted tax laws and rates.

 Stock-based compensation arrangements – The fair value of stock options is estimated on the date of grant using the 

Black-Scholes option pricing model.  The model employs various assumptions, based on management’s best estimates at the 
time of grant, which impact the calculation of fair value and ultimately, the amount of expense that is recognized over the life of 
the stock option award.  Of the required assumptions, the expected volatility of our stock price and the stock price in relation to 
the strike price have the most significant impact on the fair value calculation.  We have utilized historical data and analyzed 
current information which reasonably support these assumptions.

The fair value of our restricted stock awards and common stock units is determined based on the market value of our 
common stock on the date of grant.  Unearned stock-based compensation is charged to stockholders’ equity when restricted 
stock awards are granted.  

The fair value of our stock-based performance units is estimated using the Monte Carlo simulation method.  Since these 

awards are settled in cash at the end of a defined performance period, they are classified as a liability and are re-measured 
quarterly until settlement.  

Our stock-based compensation expense is recognized based on management’s best estimate of the awards that are expected 
to vest, using the straight-line attribution method for all service-based awards with a graded vesting feature.  If actual forfeiture 
results are different than expected, adjustments to recognized compensation expense may be required in future periods.  

2.   Accounting Standards

Not Yet Adopted

Lease accounting standard

In February 2016, the FASB issued a new lease accounting standard, which requires lessees to recognize most leases, 
including operating leases, on the balance sheet as a right of use asset and lease liability. Short-term leases can continue being 
accounted for off balance sheet based on a policy election. This standard does not apply to leases to explore for or use minerals, 
oil, natural gas and similar non-regenerative resources, including the intangible right to explore for those natural resources and 
rights to use the land in which those natural resources are contained.  This standard is effective for us in the first quarter of 2019 
and shall be applied using a modified retrospective approach at the beginning of the earliest period presented in the financial 
statements. Early adoption is permitted.  

63

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

In July 2018, the FASB issued a new transition option that allows entities to adopt the new lease accounting standard using 

the modified retrospective transition method by recognizing a cumulative-effect adjustment to the opening balance of retained 
earnings in the period of adoption rather than in the earliest period presented.  We elected this new transition option and 
continue to apply the legacy guidance in ASC 840, Leases, including its disclosure requirements, in the comparative periods 
presented in the year of adoption.

We will adopt the new standard in the first quarter of 2019 and will recognize a right of use asset and lease liability on the 
adoption date.  We will apply practical expedients provided in the standard that allow, among others, not to reassess contracts 
that commenced or expired prior to the effective date.  We also elected a policy not to recognize right of use assets and lease 
liabilities related to short-term leases. 

To facilitate the adoption of this standard, we completed the installation and configuration of a software system in January 

2019.  While we continue to evaluate our contracts and associated data for compliance with the new standard, we believe the 
adoption of this standard as of January 1, 2019 will result in the recognition of a right of use asset and related lease liability, on 
our consolidated balance sheet, between $160 million to $210 million.

Hedge accounting standard

In August 2017, the FASB issued a new accounting standards update that amends the hedge accounting model to enable 

entities to hedge certain financial and nonfinancial risk attributes previously not allowed.  The amendment also reduces the 
overall complexity of documenting, assessing and measuring hedge effectiveness.  This standard is effective for us in the first 
quarter of 2019.  The amendment mandates modified retrospective adoption when accounting for hedge relationships in effect 
as of the adoption date.  None of our derivative instruments are currently designated as hedges; as a result we do not expect the 
adoption of this standard to have a significant impact on our consolidated results of operations, financial position or cash flows.

Goodwill standard

In January 2017, the FASB issued a new accounting standards update that eliminates the requirement to calculate the 
implied fair value of the goodwill (Step 2 of goodwill impairment test under the current guidance) to measure a goodwill 
impairment charge. We anticipate the standard to require entities to record an impairment charge based on the excess of a 
reporting unit’s carrying amount over its fair value (measure the charge based on Step 1 under the current guidance). This 
standard is effective for us in the first quarter of 2020 and shall be applied on a prospective basis.  Early adoption is permitted 
for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017.  We plan to adopt the standard 
on a prospective basis, and do not expect a material impact on our consolidated results of operations, financial position or cash 
flows for prior periods.

Financial instruments - credit losses

In June 2016, the FASB issued a new accounting standards update that changes the impairment model for trade receivables, 

net investments in leases, debt securities, loans and certain other instruments.  The standard requires the use of a forward-
looking “expected loss” model as opposed to the current “incurred loss” model.  This standard is effective for us in the first 
quarter of 2020 and will be adopted on a modified retrospective basis through a cumulative-effect adjustment to retained 
earnings as of the beginning of the adoption period.  Early adoption is permitted starting January 2019.  We are evaluating the 
provisions of this accounting standards update and assessing the impact, if any, it may have on our consolidated results of 
operations, financial position or cash flows.

Recently Adopted

Revenue recognition standard

On January 1, 2018, we adopted the new ASC Topic 606, Revenue from Contracts with Customers and all the related 

amendments ("new revenue standard") using the modified retrospective method. We evaluated the effect of transition by 
applying the provisions of the new revenue standard to contracts with remaining obligations as of January 1, 2018.  No 
cumulative adjustment to retained earnings was necessary as a result of adopting this standard.

Results for reporting periods beginning after January 1, 2018 are presented under the new revenue standard, while prior 

period amounts are not adjusted and continue to be reported in accordance with our historic accounting policies.  The primary 
change relates to the presentation of marketing revenues and marketing expenses from the historical gross presentation to the 
current net presentation, included within revenues from contracts with customers, for a portion of our international contracts. 

64

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

We concluded that the adoption of the new revenue standard did not result in any significant changes to our consolidated 
balance sheet or statement of cash flows.  The following tables summarize the impacts of adopting the new revenue standard on 
our consolidated income statement for the year ended December 31, 2018.

(In millions)

Revenues and other income:

Revenues from contracts with customers
Marketing revenues
Other income

Costs and expenses:

Marketing, including purchases from related parties
Shipping, handling and other operating

Pension accounting standard

Year Ended December 31, 2018

As reported

Adjustments

Presentation
without adoption
of ASC Topic 606

$

$

5,902 $
—
150

— $

575

(12) $
159
(5)

158 $
(16)

5,890
159
145

158
559

In the first quarter of 2018, we adopted the new accounting standards update that changes how employers that sponsor 

defined pension and/or other postretirement benefit plans present the net periodic benefit cost in the income statement.  As a 
result, employers are required to present the service cost component of net periodic benefit cost in the same income statement 
line item(s) as other employee compensation costs arising from services rendered during the period.  We adopted this standard 
on a retrospective basis, and reclassified the required cost elements from general and administrative expense into production 
expense, exploration expense, and other net periodic benefit costs. The adoption of this standard did not have a significant 
impact on our consolidated balance sheet or statement of cash flows.  The following tables summarize the impacts of adopting 
this standard on our historical consolidated income statement for the years ended December 31, 2017 and 2016.

(In millions)

Production
Exploration

General and administrative

   Income (loss) from operations
Other net periodic benefit costs(a)

(In millions)

Production
Exploration
General and administrative

   Income (loss) from operations
Other net periodic benefit costs(a)

Year Ended December 31, 2017

Previously Reported

As reclassified

Effect of Change
Higher/(Lower)

$

706 $
409

400
(133)
—

716 $
409

371
(114)
(19)

10
—
(29)
19
(19)

Year Ended December 31, 2016

Previously Reported

As reclassified

Effect of Change
Higher/(Lower)

$

712 $
323
481
(832)
—

720 $
323
371
(730)
(102)

8
—
(110)
102
(102)

(a) Includes net settlement loss and other net periodic benefit costs, excluding service costs (See Note 18).

65

 
 
 
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

Classification in the statement of cash flows

In August 2016, the FASB issued a new accounting standards update which seeks to reduce the existing diversity in 
practice in how certain transactions are classified in the statement of cash flows.  This standard was effective for us in the first 
quarter of 2018, and was applied retrospectively.  Adoption of this standard did not have a significant impact on our 
consolidated statements of cash flows.

Presentation of restricted cash in the statement of cash flows

In November 2016, the FASB issued a new accounting standards update that requires entities to show the changes in the 

total of cash, cash equivalents and restricted cash in the statement of cash flows.  As a result, we no longer present transfers 
between cash and cash equivalents and restricted cash in the statement of cash flows.  When cash, cash equivalents, and 
restricted cash are presented in more than one line item on the balance sheet, the standard requires a reconciliation of the totals 
in the statement of cash flows to the related captions in the balance sheet.  This reconciliation can be presented either on the 
face of the statement of cash flows or in the notes to the financial statements.  This standard was effective for us in the first 
quarter of 2018, and was applied retrospectively.  Adoption of this standard did not have a significant impact on our 
consolidated statements of cash flows.

Accounting for sale or transfer of nonfinancial assets

In February 2017, the FASB issued a new accounting standards update that clarifies the accounting for the sale or transfer 
of nonfinancial assets and in substance nonfinancial assets to noncustomers, including partial sales.  The standard also clarifies 
that the derecognition of all businesses (except those related to conveyances of oil and gas mineral rights or contracts with 
customers) should be accounted for in accordance with the derecognition and deconsolidation guidance in Subtopic 810-10.  
This standard was effective for us in the first quarter of 2018, and was applied using the modified retrospective approach.  
Adoption of this standard did not have a significant impact on our consolidated results of operations, financial position or cash 
flows.

Definition of a business

In January 2017, the FASB issued a new accounting standards update that changes the definition of a business to assist 

entities with evaluating when a set of transferred assets and activities constitutes a business. The guidance requires us to 
evaluate if substantially all of the fair value of the gross assets acquired is concentrated in a single identifiable asset or a group 
of similar identifiable assets; if so, the set of transferred assets and activities would not represent a business. The guidance also 
requires a business to include at least one substantive process and narrows the definition of outputs by more closely aligning it 
with how outputs are described in the new revenue guidance.  This standard was effective for us in the first quarter of 2018, and 
was applied prospectively.  Adoption of this standard did not have a significant impact on our consolidated results of operations, 
financial position or cash flows.

Financial instruments updates

In January 2016, the FASB issued an accounting standards update that addresses certain aspects of recognition, 
measurement, presentation, and disclosure of financial instruments. We adopted this standard in the first quarter of 2018.  
Adoption of this standard did not have a significant impact on our consolidated results of operations, financial position or cash 
flows.

66

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

3. 

Income (Loss) and Dividends per Common Share

Basic income (loss) per share is based on the weighted average number of common shares outstanding.  Diluted income 
per share assumes exercise of stock options in all periods, provided the effect is not antidilutive.  The per share calculations 
below exclude 6 million, 11 million and 13 million stock options in 2018, 2017 and 2016 that were antidilutive.

(In millions, except per share data)
Income (loss) from continuing operations
Income (loss) from discontinued operations

Net income (loss)

Weighted average common shares outstanding
Effect of dilutive securities

Weighted average common shares, diluted

Per basic share:

Income (loss) from continuing operations
Income (loss) from discontinued operations
Net income (loss)

Per diluted share:

Income (loss) from continuing operations
Income (loss) from discontinued operations
Net income (loss)
Dividends per share

4.    Acquisitions 

2017 - United States Segment 

$

$

$
$
$

$
$
$
$

Year Ended December 31,
2017

2016

2018

1,096
—
1,096

$

$

846
1
847

1.30

$
— $
$

1.30

1.29

$
— $
$
$

1.29
0.20

(830) $

(4,893)
(5,723) $

850
—
850

(0.97) $
(5.76) $
(6.73) $

(0.97) $
(5.76) $
(6.73) $
$
0.20

(2,087)
(53)
(2,140)

819
—
819

(2.55)
(0.06)
(2.61)

(2.55)
(0.06)
(2.61)
0.20

In the fourth quarter of 2017, we closed on our acquisition of additional acreage in the Northern Delaware basin of New 

Mexico from a private seller for $63 million in cash, subject to post-closing adjustments.  We accounted for this transaction as 
an asset acquisition, allocating the purchase price to unproved property within property, plant and equipment.

In the second quarter of 2017, we closed on two acquisitions which included approximately 91,000 net acres in the 
Permian basin of New Mexico.  The first acquisition with BC Operating, Inc. and other entities closed for approximately $1.1 
billion in cash and the second acquisition with Black Mountain Oil & Gas and other private sellers closed for approximately 
$700 million in cash.  These acquisitions were paid with cash on hand and accounted for as asset acquisitions, with 
substantially all of the purchase price allocated to unproved property within property, plant and equipment. 

2016 - United States Segment

On August 1, 2016, we closed on our acquisition of PayRock Energy Holdings, LLC (“PayRock”), a portfolio company of 
EnCap Investments, including approximately 61,000 net surface acres in the oil window of the Anadarko Basin STACK play in 
Oklahoma.  The purchase price of $904 million, subject to closing adjustments, was paid with cash on hand.  We accounted for 
this transaction as an asset acquisition, with a majority of the purchase price allocated to unproved property within property, 
plant and equipment. 

67

 
 
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

5.    Dispositions

United States Segment 

In the third quarter of 2018, we closed on the sale of non-core, non-operated conventional properties, primarily in the Gulf 

of Mexico, for combined net proceeds of $16 million, before closing adjustments.  A pre-tax gain of $32 million was 
recognized in the third quarter of 2018.  

In the third quarter of 2017, we closed on the sale of certain conventional assets in Oklahoma for proceeds of $25 million, 

subject to closing adjustments, and recognized a pre-tax gain of $21 million.

In the third quarter of 2016, we entered into an agreement to sell certain non-operated CO2 and waterflood assets in West 

Texas and New Mexico. This sale closed during the fourth quarter for proceeds of $235 million, and a pre-tax gain of $63 
million.  During the third quarter 2016, we sold certain non-operated assets primarily in West Texas and New Mexico to 
multiple purchasers for combined proceeds of approximately $67 million, and recognized a total pre-tax gain of $55 million.

During the second quarter of 2016, we received proceeds of approximately $690 million related to sale of our Wyoming 
upstream and midstream assets and recorded a pre-tax gain of $266 million; with the remaining Wyoming asset sales closing in 
fourth quarter of 2016 for proceeds of $155 million, excluding closing adjustments and a pre-tax gain of $38 million.  

In March and April 2016, we entered into separate agreements to sell our 10% working interest in the outside-operated 

Shenandoah discovery in the Gulf of Mexico, operated natural gas assets in the Piceance basin in Colorado and certain 
undeveloped acreage in West Texas for a combined total of approximately $80 million in proceeds.  We closed on certain of the 
asset sales and recognized a net pre-tax loss on sale of $48 million in 2016, the remaining asset closed in 2017 with a net pre-
tax gain on sale of $32 million.

International Segment

In the fourth quarter of 2018, we entered into an agreement to sell our subsidiary, Marathon Oil KDV B.V., which holds 
our 15% non-operated interest in the Atrush block in Kurdistan for proceeds of $63 million, before closing adjustments.  This 
property is classified as held for sale in the consolidated balance sheet at December 31, 2018, with total assets of $58 million, 
total liabilities of $17 million.  We expect the transaction to close in the first half of 2019. 

In the first quarter of 2018, we closed on the sale of our subsidiary, Marathon Oil Libya Limited, which held our 16.33% 

non-operated interest in the Waha concessions in Libya, to a subsidiary of Total S.A. (Elf Aquitaine SAS) for proceeds of 
approximately $450 million, excluding closing adjustments, and recognized a pre-tax gain of $255 million. 

In the third quarter of 2017, we entered into separate agreements to sell certain non-core properties for combined proceeds 
of $53 million, before closing adjustments.  We closed on one of the asset sales in the fourth quarter of 2017 and recognized no 
pre-tax gain or loss on sale.  We closed on the remaining asset sale during the third quarter of 2018 for a pre-tax loss of $18 
million.

Canadian Business - Discontinued Operations 

On May 31, 2017 we closed on the sale of our Canadian business, which included our 20% non-operated interest in the 
AOSP to Shell and Canadian Natural Resources Limited for $2.5 billion, excluding closing adjustments. Under the terms of the 
agreement, $1.8 billion was paid to us upon closing.  At closing we received two notes receivable for a combined $750 million 
for the remaining proceeds, which was received in the first quarter of 2018. In the first quarter of 2017, we recorded a non-cash 
impairment charge of $6.6 billion (after-tax of $4.96 billion) primarily related to the property, plant and equipment of our 
Canadian business. This impairment was recorded for excess net book value over anticipated sales proceeds less costs to sell. 
Fair values of assets held for sale were determined based upon the anticipated sales proceeds less costs to sell, which resulted in 
a level 2 classification.  As the effective date of the transaction was January 1, 2017, we recorded a loss on sale of $43 million 
during the second quarter of 2017 due to results of operations from our Canadian business that were transferred to the buyer 
upon closing. 

68

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

Our Canadian business is reflected as discontinued operations in the consolidated statements of income and the 

consolidated statements of cash flows for all periods presented.  The following table contains select amounts reported in our 
historical consolidated statements of income and consolidated statements of cash flows as discontinued operations:

(In millions)

Total revenue and other income
Net gain (loss) on disposal of assets
Total revenues and other income
Costs and expenses:
Production
Exploration
Depreciation, depletion and amortization
Impairments
Other

Total costs and expenses

Pretax income (loss) from discontinued operations
Provision (benefit) for income taxes
Income (loss) from discontinued operations

(In millions)

Cash flow from discontinued operations:

Operating activities
Investing activities

Changes in cash included in current assets held for sale

Net increase in cash and cash equivalents of discontinued operations

Year Ended December 31,
2017

2016

2018

$

$

$

$

— $
—
—

$

431
(43)
388

—
—
—
—
—

—

—
—
— $

254
—
40
6,636
25

6,955
(6,567)
(1,674)
(4,893) $

863
—
863

601
7
239
—
87

934
(71)
(18)
(53)

Year Ended December 31,

2018

2017

2016

— $
—

—
— $

141
(13)
2
130

$

$

177
(41)
100
236

6.    Revenues

The majority of our revenues are derived from the sale of crude oil and condensate, NGLs and natural gas under spot and 

term agreements with our customers in the U.S. and various international locations. 

The following tables present our revenues from contracts with customers disaggregated by product type and geographic 

areas. 

United States
(In millions)

Crude oil and condensate
Natural gas liquids
Natural gas

Other

Revenues from contracts with customers $

Year Ended December 31, 2018

Eagle Ford

Bakken

Northern
Oklahoma Delaware Other U.S.

Total

$

1,554 $
205
145

8
1,912 $

1,568 $
62
38

—
1,668 $

426 $
181
184

—
791 $

235 $
38
20

—
293 $

164 $
9
26

23
222 $

3,947
495
413

31
4,886

69

                                              
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

International
(In millions)

Crude oil and condensate
Natural gas liquids
Natural gas
Other

$

Revenues from contracts with customers

$

Year Ended December 31, 2018

E.G.

U.K.

Libya

Other
International

Total

342 $
4
37
1
384 $

282 $
5
40
32
359 $

187 $
—
9
—
196 $

77 $
—
—
—
77 $

888
9
86
33
1,016

The pricing in our hydrocarbon sales agreements are variable, determined using various published benchmarks which are 

adjusted for negotiated quality and location differentials.  As a result, revenue collected under our agreements with customers is 
highly dependent on the market conditions and may fluctuate considerably as the hydrocarbon market prices rise or fall. 
Typically, our customers pay us monthly, within a short period of time after we deliver the hydrocarbon products.  As such, we 
do not have any financing element associated with our contracts.  We do not have any issues related to returns or refunds, as 
product specifications are standardized for the industry and are typically measured when transferred to a common carrier or 
midstream entity, and other contractual mechanisms (e.g., price adjustments) are used when products do not meet those 
specifications. 

In limited cases, we may also collect advance payments from customers as stipulated in our agreements; payments in 

excess of recognized revenue are recorded as contract liabilities on our consolidated balance sheet. 

Under our hydrocarbon sales agreements, the entire consideration amount is variable either due to pricing and/or volumes.  

We recognize revenue in the amount of variable consideration allocated to distinct units of hydrocarbons transferred to a 
customer.  Such allocation reflects the amount of total consideration we expect to collect for completed deliveries of 
hydrocarbons and the terms of variable payment relate specifically to our efforts to satisfy the performance obligations under 
these contracts. Our performance obligations under our hydrocarbon sales agreements are to deliver either the entire production 
from the dedicated wells or specified contractual volumes of hydrocarbons.

We often serve as the operator for jointly owned oil and gas properties.  As part of this role, we perform activities to 

explore, develop and produce oil and gas properties in accordance with the joint operating arrangement and collective decisions 
of the joint parties. Other working interest owners reimburse us for costs incurred based on our agreements. We determined that 
these activities are not performed as part of customer relationships, in accordance with the new revenue standard, and such 
reimbursements will continue to not be recorded as revenues within the scope of the new revenue standard.

In addition, we commonly market the share of production belonging to other working interest owners as the operator of 
jointly owned oil and gas properties. We concluded that those marketing activities are carried out as part of the collaborative 
arrangement, and we do not purchase or otherwise obtain control of other working interest owners’ share of production. 
Therefore, we act as a principal only in regards to the sale of our share of production and recognize revenue for the volumes 
associated with our net production.

Crude oil and condensate

For the crude sales agreements, we satisfy our performance obligations and recognize revenue once customers take control 

of the crude at the designated delivery points, which include pipelines, trucks or vessels. 

Natural gas and NGLs 

When selling natural gas and NGLs, we engage midstream entities to process our production stream by separating natural 
gas from the NGLs.  Frequently, these midstream entities also purchase our natural gas and NGLs under the same agreements.  
In these situations, we determined the performance obligation is complete and satisfied at the tailgate of the processing plant 
when the natural gas and NGLs become identifiable and measurable products. We determined the plant tailgate is the point in 
time where control, as defined in the new revenue standard, is transferred to midstream entities and they are entitled to 
significant risks and rewards of ownership of the natural gas and NGLs. 

 The amounts due to midstream entities for gathering and processing services are recognized as shipping and handling cost, 
since we make those payments in exchange for distinct services. Under some of our natural gas processing agreements, we have 
an option to take the processed natural gas and NGLs in-kind and sell to customers other than the processing company. In those 
circumstances, our performance obligations are complete after delivering the processed hydrocarbons to the customer at the 
designated delivery points, which may be the tailgate of the processing plant or an alternative delivery point requested by the 
customer. 

70

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

We have “percentage-of-proceeds” arrangements with some midstream entities where they retain a percentage of the 
proceeds collected for selling our processed natural gas and NGLs as compensation for their processing and marketing services. 
We recognize revenue for the gross sales volumes and recognize the proceeds retained by midstream companies as shipping and 
handling cost.

Contract receivables and liabilities

The following table provides information about receivables and contract assets (liabilities) from contracts with customers.

(In millions)

December 31,
2018

January 1,
2018

Receivables from contracts with customers, which are included in receivables, less reserves
Contract asset (liability)

$
$

714 $
(1) $

811
—

The contract liability primarily relates to the advance consideration received from customers for crude oil sales and 
processing services in the U.K.  A contract asset would represent crude oil delivered in the U.K. to a customer for which 
payment will be collected over time as it becomes due under the pricing terms stipulated in the sales agreement.  As a practical 
expedient, when the balance of this U.K. customer is a contract asset, we do not adjust revenue for the effects of a significant 
financing element as the period between when crude oil is delivered to the customer and when payment is expected to be 
received is one year or less at contract inception. 

Significant changes in the contract asset (liability) balance during the period are as follows.

(In millions)

Contract asset balance as of January 1, 2018

Revenue recognized as performance obligations are satisfied
Amounts invoiced to customers

Contract asset (liability) balance as of December 31, 2018

 7.    Segment Information

Year Ended
December 31, 2018

$

$

—

109
(110)
(1)

We have two reportable operating segments.  Each of our two reportable operating segments are organized by geographic 

location and managed according to the nature of the products and services offered.

•  United States ("U.S.") – explores for, produces and markets crude oil and condensate, NGLs and natural gas in the 

United States

• 

International ("Int'l") – explores for, produces and markets crude oil and condensate, NGLs and natural gas outside of 
the United States and produces and markets products manufactured from natural gas, such as LNG and methanol, in 
E.G.

Information regarding assets by segment is not presented because it is not reviewed by the chief operating decision maker 

(“CODM”).  Segment income (loss) represents income (loss) which excludes certain items not allocated to our operating 
segments, net of income taxes.  A portion of our corporate and operations general and administrative support costs are not 
allocated to the operating segments.  These unallocated costs primarily consist of employment costs (including pension effects), 
professional services, facilities and other costs associated with corporate and operations support activities.  Additionally, items 
which affect comparability such as: gains or losses on dispositions, proved property impairments, certain exploration expenses 
relating to a strategic decision to exit conventional exploration, change in tax expense associated with a tax rate change, changes 
in our valuation allowance, unrealized gains or losses on commodity derivative instruments, pension settlement losses or other 
items (as determined by the CODM) are not allocated to operating segments.

As discussed in Note 5, we closed on the sale of our Canadian business, which includes our Oil Sands Mining segment and 
exploration stage in-situ leases, in the second quarter of 2017.  The Canadian business is reflected as discontinued operations and 
is excluded from segment information in all historical periods presented. 

During the year, we renamed our United States E&P and International E&P segments to the United States and International 

segments.  See Note 1 for further information.

71

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

Year Ended December 31, 2018

(In millions)

Revenues from contracts with customers
Net gain (loss) on commodity derivatives
Income from equity method investments
Net gain (loss) on disposal of assets
Other income

Less costs and expenses:

Production
Shipping, handling and other operating
Exploration
Depreciation, depletion and amortization
Impairments
Taxes other than income
General and administrative
Net interest and other
Other net periodic benefit costs
Income tax provision (benefit)

U.S.

Int'l

$

$
$

4,886
(281)
—
—
16

625
499
246
2,217
—
301
146
—
—
(21)
608
2,620

$

$
$

Not Allocated
to Segments
—
$
267
—
319
122

1,016
—
225
—
12

215
70
3
197
—
—
32
—
(9)
272
473
39

$
$

2
6
40
27
75
(2)
216
226
23
80
15
26

(b)

(c)

(d)

(e)

(f)

(g)

$

Total

5,902
(14)
225
319
150

842
575
289
2,441
75
299
394
226
14
331
1,096
2,685

$
$

Segment income (loss) / Income (loss) from continuing operations
Capital expenditures(a)
Includes accruals.

(a) 
(b)  Unrealized gain on commodity derivative instruments (see Note 14). 
(c) 
(d)         Primarily a reduction of asset retirement obligations in our International segment (see Note 12).
(e)   Primarily related to dry well expense and unproved property impairment associated with the Rodo well in Alba Block Sub Area B, offshore E.G. (see Note 

Primarily related to the gain on sale of our Libya subsidiary (see Note 5).

10).

(f)  Due to the anticipated sales of certain non-core proved properties in our International and United States segments (see Note 11).
(g)  

Includes pension settlement loss of $21 million (see Note 18).

72

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

(In millions)

Revenues from contracts with customers
Net gain (loss) on commodity derivatives
Marketing revenues
Income from equity method investments
Net gain on disposal of assets
Other income

Less costs and expenses:

Production
Marketing
Shipping, handling, and other operating
Exploration
Depreciation, depletion and amortization
Impairments
Taxes other than income
General and administrative
Net interest and other
Other net periodic benefit costs
Loss on early extinguishment of debt
Income tax provision (benefit)

Year Ended December 31, 2017

U.S.

Int'l

$

3,093
45
29
—
1
12

476
36
354
154
2,011
4
173
119
—
—
—
1
(148) $
$
2,081

1,154
—
133
256
—
6

239
132
77
5
328
—
—
30
—
(8)
—
372
374
42

$

$
$

Not Allocated
to Segments
—
$
(81)
—
—
57
60

1
—
—
250
33
225
10
222
270
27
51
3
(1,056)
27

$
$

Total

4,247
(36)
162
256
58
78

716
168
431
409
2,372
229
183
371
270
19
51
376
(830)
2,150

$

(b)

(c)

(d)

(e)

(f)

(g)

(h)

$
$

Segment income (loss) / Income (loss) from continuing operations
Capital expenditures(a)
Includes accruals.

(a) 
(b)  Unrealized loss on commodity derivative instruments (see Note 14). 
(c) 
(d)         Primarily related to unproved property impairments associated with certain non-core properties within our International segment (see Note 11).
(e) 

Primarily related to the sale of certain conventional assets in Oklahoma and Colorado (see Note 5).

Primarily related to proved property impairments associated with certain non-core properties within our International segment (see Note 11).
Includes a gain of $46 million resulting from the termination of our forward starting interest rate swaps (see Note 14).   
Includes pension settlement loss of $32 million (see Note 18).
Primarily related to the make-whole call provisions paid upon redemption of our senior unsecured notes (see Note 16).

(f)  
(g) 
(h) 

73

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

(In millions)

Revenues from contracts with customers
Net gain (loss) on commodity derivatives
Marketing revenues
Income from equity method investments
Net gain (loss) on disposal of assets
Other income

Less costs and expenses:

Production
Marketing costs
Shipping, handling, and other operating
Exploration
Depreciation, depletion and amortization
Impairments
Taxes other than income
General and administrative
Net interest and other
Other net periodic benefit costs
Income tax provision (benefit)

Year Ended December 31, 2016

U.S.

Int'l

$

$
$

$

2,331
44
135
—
8
20

486
142
328
127
1,835
20
149
94
—
—
(228)
(415) $
$
936

665
—
105
175
2
30

234
103
43
17
276
—
—
30
—
(3)
49
228
82

$

(b)

Not Allocated
to Segments
—
$
(110)
—
—
379 (c)
3

(d)

(e)

(f)

(g)

(h)

—
—
113
179
45
47
2
247
332
105
1,102
(1,900)
18

$
$

$
$

Total

2,996
(66)
240
175
389
53

720
245
484
323
2,156
67
151
371
332
102
923
(2,087)
1,036

Segment income (loss) / Income (loss) from continuing operations
Capital expenditures(a)
Includes accruals.

(a) 
(b)  Unrealized loss on commodity derivative instruments (see Note 14). 
(c) 
Primarily related to net gain on disposal of assets (see Note 5).
Includes termination payment on our Gulf of Mexico deepwater drilling rig commitment of $113 million.
Primarily related to impairments associated with the decision to not drill remaining Gulf of Mexico undeveloped leases (see Note 11).

(d) 

(e) 
(f)          Proved property impairments (see Note 11).
(g)  

(h) 

Includes pension settlement loss of $103 million (see Note 18).
Increased valuation allowance on certain of our deferred tax assets of $1,346 million.

Revenues from external customers (including commodity derivatives) are attributed to geographic areas based upon selling 

location.  The following summarizes revenues from external customers by geographic area.

(In millions)
United States
Equatorial Guinea
Libya(a)
U.K.
Other international

Total

Year Ended December 31,
2017

2016

2018

4,872
383
196
360
77
5,888

$

$

3,086
530
431
289
37
4,373

$

$

2,400
444
54
263
9
3,170

$

$

(a)  The decrease in 2018 is due to the sale of our Libya subsidiary in the first quarter of 2018 (see Note 5).

In 2018, sales to Valero Marketing and Supply and Flint Hills Resources and each of their respective affiliates, each 
accounted for approximately 11% of our total revenues. In 2017, sales to Vitol and each of their respective affiliates accounted 
for approximately 10% of our total revenues.  In 2016, sales to Valero Marketing and Supply, Tesoro Petroleum, and Flint Hills 
Resources and each of their respective affiliates accounted for approximately 13%, 11% and 10% of our total revenues. 

74

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

The following summarizes total revenues from external customers (including commodity derivatives) by product line.

(In millions)
Crude oil and condensate
Natural gas liquids
Natural gas
Other

Total

The following summarizes property, plant and equipment and equity method investments.

(In millions)
United States
Equatorial Guinea
Other international(a)

Total long-lived assets

(a)  The decrease in 2018 is due to the sale of our Libya subsidiary in the first quarter of 2018 (see Note 5).

8.  Income Taxes

Income (loss) from continuing operations before income taxes were:

Year Ended December 31,
2017

2016

2018

$

$

4,823
504
497
64
5,888

$

$

$

$

3,477
338
510
48
4,373

$

$

2,605
198
356
11
3,170

December 31,

2018

2017

16,094
1,333
122
17,549

$

$

15,955
1,598
959
18,512

(In millions)

United States

Foreign

Total

Year Ended December 31,

2018

2017

2016

$

$

642

785

1,427

$

$

(783) $
329
(454) $

(1,449)
285
(1,164)

Income tax provisions (benefits) for continuing operations were: 

2018

Year Ended December 31,
2017

2016

(In millions)
Federal
State and local
Foreign

Current Deferred
$

$

6
(1)
274
279

— $
(23)
75
52

$

Total

$

$

Total

6
(24)
349
331

Current Deferred
41
$
2
(104)
(61) $

(32) $
(14)
483
437

$

$

$

Total

9
(12)
379
376

$

Current Deferred
836
$
8
(16)
828

2
2
91
95

$

$

Total

$

$

838
10
75
923

75

 
 
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

A reconciliation of the federal statutory income tax rate applied to income (loss) from continuing operations before income 

taxes to the provision (benefit) for income taxes follows:

(In millions)

Total pre-tax income (loss) from continuing operations
Total income tax expense (benefit)
Effective income tax rate on continuing operations

Year Ended December 31,
2017

2018

2016

$
$

1,427
331

$
$

23%

(454)
376

$
$

83%

(1,164)
923

79%

$

Income taxes at the statutory tax rate(a)(b)
(407)
47
Effects of foreign operations
1,270
Adjustments to valuation allowances
9
State income taxes
6
Tax law change
(2)
Other federal tax effects
Income tax expense (benefit) on continuing operations
923
(a) Includes income tax benefits primarily related to our U.S. federal income taxes where we have maintained a full valuation allowance since December 2016.
(b)  As a result of the Tax Reform Legislation (see below), the U.S. corporate income tax rate was reduced to 21% in 2018.  The U.S. corporate income tax rate 

(159)
140
446
(19)
(35)
3
376

300
214
(177)
(17)
—
11
331

$

$

$

$

$

was 35% in 2017 and 2016.   

The effective income tax rate is influenced by a variety of factors including the geographic and functional sources of 
income and the relative magnitude of these sources of income. The difference between the total provision and the sum of the 
amounts allocated to segments is reported in the "Not Allocated to Segments" column of the tables in Note 7.

Effects of foreign operations – The effects of foreign operations increased our tax expense in 2018, 2017 and 2016 due to 

the mix of pre-tax income between high and low tax jurisdictions, including Libya where the tax rate is 93.5%.  Excluding 
Libya, the effective tax rates on continuing operations would be an expense of 14% in 2018, an expense of 5% in 2017, and an 
expense of 79% in 2016.  As a result of the sale of our Libya subsidiary in the first quarter of 2018, we do not expect to incur 
further tax expense related to Libya. 

Adjustments to valuation allowances – Since December 31, 2016, we have maintained a full valuation allowance on our net 

federal deferred tax assets.  In 2018, we reduced our valuation allowance by $177 million primarily related to current year 
activity in the U.S. 

Change in tax law – On December 22, 2017, the U.S. enacted the Tax Cuts and Jobs Act (the “Tax Reform Legislation”).  

Tax Reform Legislation, which is also commonly referred to as “U.S. tax reform”, significantly changing U.S. corporate 
income tax laws by, among other things, reducing the U.S. corporate income tax rate to 21% starting in 2018, and repeal of the 
corporate alternative minimum tax (“AMT”), and a one-time deemed repatriation of accumulated foreign earnings.  In the 
fourth quarter of 2017, we remeasured our deferred taxes at 21%, in accordance with U.S. GAAP. The impact of the 
remeasurement on our federal deferred tax assets and liabilities was equally offset by an adjustment to our valuation allowance 
with no material impact to current year earnings.  In accordance with Staff Accounting Bulletin No. 118 ("SAB 118") we 
finalized our tax position in the fourth quarter of 2018 with no material changes made to positions considered provisional as of 
December 31, 2017.

76

 
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

Deferred tax assets and liabilities resulted from the following:

(In millions)
Deferred tax assets:
Employee benefits
Operating loss carryforwards
Capital loss carryforwards
Foreign tax credits
Other credit carryforwards
Investments in subsidiaries and affiliates
Other

Subtotal
Valuation allowance

Total deferred tax assets

Deferred tax liabilities:
Property, plant and equipment
Accrued revenue
Other

Total deferred tax liabilities

Net deferred tax liabilities
Net deferred tax assets

Year Ended December 31,

2018

2017

$

$

102
1,304
2
611
—
—
5
2,024
(749)
1,275

1,018
60
3
1,081

$
$

— $
$

194

111
1,030
3
611
—
174
69
1,998
(926)
1,072

1,332
81
3
1,416
344
—

Operating loss carryforwards – At December 31, 2018, our operating loss carryforwards, relating to tax years beginning 

prior to January 1, 2018, before valuation allowance, include $655 million from the U.S. that expire in 2035-2037.  Our 
operating loss carryforwards in the U.S. for tax years beginning after December 31, 2017, before our valuation allowance, 
include $472 million which can be carried forward indefinitely.  Foreign operating loss carryforwards include $26 million that 
begin to expire in 2019.  State operating loss carryforwards of $151 million expire in 2019 through 2038.  

Valuation allowances – At December 31, 2018, we reflect a valuation allowance in our consolidated balance sheet of $749 

million against our net deferred tax assets in various jurisdictions in which we operate.  

Property, plant and equipment – At December 31, 2018, we reflected a deferred tax liability of $1,018 million.  The 

reduction primarily relates to the sale of our Libya subsidiary in the first quarter of 2018.

Net deferred tax assets and liabilities were classified in the consolidated balance sheets as follows:

(In millions)
Assets:

Other noncurrent assets

Liabilities:

Noncurrent deferred tax liabilities

Net deferred tax liabilities
Net deferred tax assets

December 31,

2018

2017

$

$
$

393

$

199
— $
$

194

489

833
344
—

We are continuously undergoing examination of our U.S. federal income tax returns by the IRS.  Such audits have been 
completed through the 2014 tax year, with the exception of 2010-2011. Based on the status of the proposed settlement in the 
2010-2011 IRS Federal Tax Audit ("IRS Audit"), as of December 31, 2018 we have established a receivable of $146 million 
with $73 million classified in other current assets on the consolidated balance sheet based on the AMT refunds we expect to 
receive in the next 12 months, and a receivable classified in other noncurrent assets of $73 million on the consolidated balance 
sheet related to future AMT refunds.  As of December 31, 2018, we do not consider the IRS Audit to be effectively settled, 
however we believe the IRS Audit will be settled within the next 12 months.  As a result, we have established an uncertain tax 
position for the same amount resulting in no impact to the consolidated statement of income for the year ended December 31, 
2018.  See Note 25 for further detail.  Further, we are routinely involved in U.S. state income tax audits and foreign jurisdiction 
tax audits.  We believe all other audits will be resolved within the amounts paid and/or provided for these liabilities.

77

 
 
 
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

As of December 31, 2018, our income tax returns remain subject to examination in the following major tax jurisdictions for 

the tax years indicated:

United States(a)
Equatorial Guinea
United Kingdom
(a) 

Includes federal and state jurisdictions.

2008-2017
2007-2017
2008-2017

The following table summarizes the activity in unrecognized tax benefits:

(In millions)
Beginning balance

Additions for tax positions of prior years
Reductions for tax positions of prior years
Settlements
Statute of limitations

Ending balance

2018

2017

2016

$

$

126
152
(15)
—
—
263

$

$

66
83
(3)
(20)
—
126

$

$

65
6
(5)
—
—
66

If the unrecognized tax benefits as of December 31, 2018 were recognized, $160 million would affect our effective income 

tax rate.  As of December 31, 2018, there are $251 million uncertain tax positions for which it is reasonably possible that the 
amount could significantly change during the next twelve months.  In the first quarter 2019 we withdrew our appeal in the U.K. 
related to the timing of certain Brae area decommissioning costs.  As a result in the first quarter of 2019 we expect our 
unrecognized tax benefits to reduce by $68 million with no adverse earnings impact on our consolidated results of operations.  
See Note 25 for further detail.

Interest and penalties are recorded as part of the tax provision and were $2 million, $27 million and $1 million related to 
unrecognized tax benefits in 2018, 2017 and 2016.  As of December 31, 2018 and 2017, $27 million and $25 million of interest 
and penalties were accrued related to income taxes.

9. Inventories

Crude oil and natural gas are recorded at weighted average cost and carried at the lower of cost or net realizable value. 
Supplies and other items consist principally of tubular goods and equipment which are valued at weighted average cost and 
reviewed periodically for obsolescence or impairment when market conditions indicate. 

(In millions)
Crude oil and natural gas
Supplies and other items

Inventories

10.  Property, Plant and Equipment

(In millions)
United States
International(a)
Corporate

Net property, plant and equipment

(a) Decrease in 2018 is primarily the result of the sale of our Libya subsidiary in 2018, see Note 5 for further detail.

78

December 31,

2018

2017

11
85
96

$

$

9
117
126

December 31,

2018

2017

16,011
710
83
16,804

$

$

15,867
1,710
88
17,665

$

$

$

$

 
 
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

At December 31, 2018, 2017 and 2016 we had total deferred exploratory well costs as follows:

(In millions)
Amounts capitalized less than one year after completion of drilling
Amounts capitalized greater than one year after completion of drilling

Total deferred exploratory well costs
Number of projects with costs capitalized greater than one year after

completion of drilling

December 31,

2018

2017

2016

$

$

$

$

297
—
297

—

$

$

263
32
295

1

131
118
249

3

2018

2017

2016

(In millions)
Beginning balance
Additions
Charges to expense(a)
Transfers to development
Dispositions(b)

437
299
(23)
(388)
(76)
249
2018 includes $32 million related to the Rodo well in Alba Block Sub Area B, offshore E.G.  2017 includes $64 million as a result of our agreement to sell 
Diaba License G4-223 in the Republic of Gabon (see Note 11 for further detail).
Includes the sale of our Libya subsidiary in 2018 and GOM assets in 2016.

295
262
(35)
(197)
(28)
297

249
212
(64)
(102)
—
295

Ending balance
(a) 

$

$

$

$

$

$

(b) 

We had no exploratory well costs capitalized greater than one year as of December 31, 2018 and $32 million as of 

December 31, 2017.  During the fourth quarter 2018, we concluded our evaluation of drilling opportunities on the Rodo well in 
Alba Block Sub Area B, offshore E.G. and determined that we would not pursue further activity.  As a result, $32 million in 
exploratory well costs were expensed.

11. Impairments

The following table summarizes impairment charges of proved properties from continuing operations. Additionally, it 
presents the values of assets, by major category, measured at fair value on a nonrecurring basis in periods subsequent to their 
initial recognition.  

(In millions)
Long-lived assets held for use

Fair Value
113
$

Impairment
75
$

Fair Value
179
$

Impairment
229
$

Fair Value
15
$

Impairment
67
$

2018

2017

2016

• 

• 

• 

2018 - Impairments in our International and United States segments of $75 million, to a fair value of $113 million, 
were largely the result of anticipated sales for certain non-core proved properties. The related fair value measurement 
utilized the market approach, based upon anticipated sales proceeds less costs to sell which resulted in a Level 2 
classification. 

2017 - Impairments in our International segment were primarily a result of lower forecasted long-term commodity 
prices and the anticipated sales of certain non-core proved properties of $136 million, to an aggregate fair value of 
$103 million.  These fair values were measured using the market approach, based upon either anticipated sales 
proceeds less costs to sell or a market comparable sales price per boe which resulted in a Level 2 classification.

Impairments in our United States segment were $89 million, to an aggregate fair value of $76 million, and related to 
Gulf of Mexico and certain conventional Oklahoma assets primarily as a result of lower forecasted long-term 
commodity prices.  The fair values were measured using an income approach based upon internal estimates of future 
production levels, prices and discount rate. Inputs to the fair value measurement include reserve and production 
estimates made by our reservoir engineers, estimated future commodity prices adjusted for quality and location 
differentials and forecasted operating expenses for the remaining estimated life of the reservoir which resulted in a 
Level 3 classification. 

2016 - Impairments of $67 million, to an aggregate fair value of $15 million, consisted primarily of proved properties 
in Oklahoma and the Gulf of Mexico in our United States segment as a result of lower forecasted commodity prices 
and revisions to estimated abandonment costs.  The fair values were measured using an income approach based upon 
internal estimates of future production levels, prices and discount rate. Inputs to the fair value measurement include 
reserve and production estimates made by our reservoir engineers, estimated future commodity prices adjusted for 

79

 
 
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

quality and location differentials and forecasted operating expenses for the remaining estimated life of the reservoir 
which resulted in a Level 3 classification. 

See Note 5 for discussion of the divestitures in further detail and Note 7 for relevant detail regarding segment presentation.

The following table summarizes impairment charges of unproved properties included as a component of exploration expense:

(In millions)

Exploration Expenses

Unproved property impairments
Dry well costs
Geological and geophysical
Other

Total exploration expenses

Year Ended December 31,
2017

2016

2018

$

$

208
47
21
13
289

$

$

246
77
25
61
409

$

$

195
25
5
98
323

Unproved property impairments and dry well costs

• 

• 

• 

2018 - During the fourth quarter 2018, we concluded our evaluation of drilling opportunities on the Rodo well in Alba 
Block Sub Area B, offshore E.G. and determined that we would not pursue further activity.  As a result, we expensed 
$32 million in dry well costs and $16 million in unproved property impairments.  See Note 10 for further discussion.

2017 - As a result of lower forecasted long-term commodity prices and the anticipated sales of certain non-core 
international properties we recorded a non-cash charge of $95 million to unproved property impairments related to 
various properties; and $64 million in dry well costs related to our Diaba License G4-223 in the Republic of Gabon.  
Also, as a result of our decision not to develop the Tchicuate offshore Block in the Republic of Gabon, we recorded a 
non-cash charge of $43 million to unproved property impairments. 

2016 - Unproved property impairments are primarily a result of our decision to not drill any of our remaining Gulf of 
Mexico undeveloped leases and also included certain other unproved properties in the United States. 

See Note 5 for relevant detail regarding the disposition of assets and Note 7 for relevant detail regarding segment 

presentation of unproved property impairments.

80

 
 
 
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

12.  Asset Retirement Obligations

Asset retirement obligations primarily consist of estimated costs to remove, dismantle and restore land or seabed at the end 

of oil and gas production operations.  Changes in asset retirement obligations for the periods ended December 31 were as 
follows: 

2018

2017

(In millions)
Beginning balance

Incurred liabilities, including acquisitions
Settled liabilities, including dispositions
Accretion expense (included in depreciation, depletion and amortization)
Revisions of estimates
Held for sale(a) 

1,652
25
(50)
85
(227)
(2)
Ending balance(b)
1,483
(a) In the fourth quarter 2018, we entered into an agreement to sell our working interest in the Droshky field (Gulf of Mexico), including our $98 million asset 

1,483
21
(117)
70
(204)
(108)
1,145

$

$

$

$

retirement obligation.  This transaction closed during the first quarter of 2019. 

(b)

 $944 million of the 2018 ending balance relates to our asset retirement obligations in the U.K.

2018 

• 

Settled liabilities include dispositions, primarily related to the sale of non-core, non-operated conventional properties in the 
Gulf of Mexico as well as retirements in the U.K.

•  Revisions of estimates were primarily due to the acceleration of U.K. abandonment activities to capture favorable market 

conditions and lower estimated abandonment costs.

•  Ending balance primarily relates to the U.K. and includes $64 million classified as short-term at December 31, 2018.

2017 

• 

Settled liabilities include dispositions, primarily related to the sale of certain conventional assets in Oklahoma as well as 
retirements in the U.K. and the Gulf of Mexico.

•  Revisions of estimates were primarily due to changes in U.K. estimated costs as well as timing of abandonment activities in 

the U.K. 

•  Ending balance primarily relates to the U.K. and includes $55 million classified as short-term at December 31, 2017.

13. Goodwill  

As of December 31, 2018, our consolidated balance sheet included goodwill of $97 million.  Goodwill is tested for 
impairment on an annual basis, or between annual tests when events or changes in circumstances indicate the fair value may 
have been reduced below its carrying value.  Goodwill is tested for impairment at the reporting unit level.  Our reporting units 
are the same as our reporting segments, of which only International includes goodwill.  We first assess the qualitative factors in 
order to determine whether the fair value of our International reporting unit is more likely than not less than its carrying 
amount.  Certain qualitative factors used in our evaluation include, among other things, the results of the most recent 
quantitative assessment of the goodwill impairment test, macroeconomic conditions; industry and market conditions (including 
commodity prices and cost factors); overall financial performance; and other relevant entity-specific events.  If, after 
considering these events and circumstances we determined that it is more likely than not that the fair value of the International 
reporting unit is less than its carrying amount, a quantitative goodwill test is performed.  The quantitative goodwill test is 
performed using a combination of market and income approaches.  The market approach references observable inputs specific 
to us and our industry, such as the price of our common equity, our enterprise value, and valuation multiples of us and our peers 
from the investor analyst community.  The income approach utilizes discounted cash flows, which are based on forecasted 
assumptions.  Key assumptions to the income approach include future liquid hydrocarbon and natural gas pricing, estimated 
quantities of liquid hydrocarbons and natural gas proved and probable reserves, estimated timing of production, discount rates, 
future capital requirements, operating expenses and tax rates.  The assumptions used in the income approach are consistent with 
those that management uses to make business decisions.  This quantitative goodwill test would represent Level 3 fair value 
measurements.

During the second quarter of 2018, we performed our annual impairment test of goodwill using the qualitative assessment. 
Our qualitative assessment considered the significant excess fair value over carrying value in our most recent step 1 test (second 
quarter 2017) and noted a general improvement in the qualitative factors above.  After assessing the totality of the qualitative 

81

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

factors which could have a positive or negative impact on goodwill, our assessment did not indicate that it is more likely than 
not that the fair value is less than its carrying value.  As a result, we concluded that no impairment to goodwill was required for 
our International reporting unit.

As of December 31, 2018 and 2017 our International Segment is the only reporting segment which includes goodwill.  The 
table below displays the allocated beginning goodwill balance of our International segment along with changes in the carrying 
amount of goodwill for 2018 and 2017: 

(In millions)
2017
Beginning balance, gross

Less: accumulated impairments

Beginning balance, net

  Dispositions
Impairment
Ending balance, net
2018
Beginning balance, gross

Less: accumulated impairments

Beginning balance, net
Dispositions (a)
Impairment
Ending balance, net
(a)

 Primarily related to the sale of our Libya subsidiary (see Note 5).

14.  Derivatives

International

115
—
115
—
—
115

115
—
115
(18)
—
97

$

$

$

$

For further information regarding the fair value measurement of derivative instruments see Note 15.  See Note 1 for 
discussion of the types of derivatives we may use and the reasons for them.  All of our commodity derivatives and historical 
interest rate derivatives are/were subject to enforceable master netting arrangements or similar agreements under which we 
report net amounts.  The following tables present the gross fair values of derivative instruments and the reported net amounts 
along with where they appear on the consolidated balance sheets.  

(In millions)

Asset

Liability

Net Asset
(Liability)

Balance Sheet Location

December 31, 2018

Not Designated as Hedges

     Commodity

     Commodity
Total Not Designated as Hedges

(In millions)
Not Designated as Hedges
     Commodity
     Commodity
Total Not Designated as Hedges

$

$

$

$

131

—
131

$

$

— $

4
4

$

131 Other current assets

(4) Deferred credits and other liabilities

127

December 31, 2017

Asset

Liability

Net Asset
(Liability)

Balance Sheet Location

— $
—
— $

138
2
140

$

$

(138) Other current liabilities

(2) Deferred credits and other liabilities

(140)

82

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

Derivatives Not Designated as Hedges

Terminated Interest Rate Swaps

During the third quarter of 2016, we entered into forward starting interest rate swaps to hedge the variations in cash flows 
related to fluctuations in long term interest rates from debt that were probable to be refinanced by us in 2018, specifically interest 
rate risk associated with future changes in the benchmark treasury rate.  During the second quarter of 2017, we de-designated the 
forward starting interest rate swaps previously designated as cash flow hedges.  In the third quarter of 2017, the forecasted 
transaction consummated and we issued $1 billion in senior unsecured notes.  As a result, in the third quarter of 2017 we 
terminated our forward starting interest rate swaps for proceeds of $54 million.  We recognized a gain of $46 million, related to 
deferred gains reclassified from accumulated other comprehensive income, in net interest and other during 2017.  See Note 16 
for further detail.  

The following table sets forth the net impact of the terminated forward starting interest rate swap derivatives de-designated 

as cash flow hedges on other comprehensive income (loss).

Year Ended December 31,
2017

2016

2018

$

$

— $
—

—
— $

$

60
(13)
(47)
— $

—
64
(4)
60

(In millions)

Interest Rate Swaps

  Beginning balance

Change in fair value recognized in other comprehensive income

Reclassification from other comprehensive income

  Ending balance

83

 
 
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

Commodity Derivatives

We have entered into multiple crude oil and natural gas derivatives indexed to NYMEX WTI and Henry Hub related to a 

portion of our forecasted United States sales through 2020. These commodity derivatives consist of three-way collars, basis 
swaps, and NYMEX roll basis swaps.  Three-way collars consist of a sold call (ceiling), a purchased put (floor) and a sold put.  
The ceiling price is the maximum we will receive for the contract volumes; the floor is the minimum price we will receive, 
unless the market price falls below the sold put strike price.  In this case, we receive the NYMEX WTI/Henry Hub price plus the 
difference between the floor and the sold put price.  These commodity derivatives were not designated as hedges.  The following 
table sets forth outstanding derivative contracts as of December 31, 2018 and the weighted average prices for those contracts:

Crude Oil
Three-Way Collars 

Volume (Bbls/day)
Weighted average price per Bbl:

Ceiling

Floor
Sold put
Basis Swaps (a)(b)

Volume (Bbls/day)

Weighted average price per Bbl

NYMEX Roll Basis Swaps

Volume (Bbls/day)
Weighted average price per Bbl

Natural Gas
Three-Way Collars 

Volume (MMBtu/day)

200,000

Weighted average price per MMBtu:

Ceiling

Floor

Sold put

$5.25

$3.43

$2.88

2019

First
Quarter

Second
Quarter

Third
Quarter

Fourth
Quarter

70,000

70,000

50,000

50,000

$71.21

$55.86
$48.71

10,000

$(0.82)

60,000
$0.38

$71.21

$55.86
$48.71

10,000

$(0.82)

60,000
$0.38

—

—

—

—

$75.88

$57.80
$50.80

10,000

$(0.82)

60,000
$0.38

—

—

—

—

$75.88

$57.80
$50.80

10,000

$(0.82)

60,000
$0.38

—

—

—

—

2020

Full Year

—

—

—
—

15,000

$(0.94)

—
—

—

—

—

—

(a)       The basis differential price is between WTI Midland and WTI Cushing.
(b)     Between January 1, 2019 and February 12, 2019, we entered into 5,000 Bbls/day of Midland basis swaps for July - December 2019 with an average price of 

$(2.55) and 1,000 Bbls/day of Clearbrook basis swaps for March - December 2019 with an average price of $(3.50). 

The mark-to-market impact and settlement of these commodity derivative instruments appears in net gain (loss) on 
commodity derivatives in our consolidated statements of income for the years ended December 31, 2018, 2017, and 2016.  The 
December 31, 2018, 2017, and 2016 mark-to-market impact was a net gain of $267 million, a net loss of $81 million and a net 
loss of $110 million, respectively.  Net settlements of commodity derivative instruments for the years ended December 31, 2018, 
2017, and 2016 were a loss of $281 million, a gain of $45 million and a gain of $44 million, respectively.

84

 
 
 
 
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

15.  Fair Value Measurements

Fair Values – Recurring

The following tables' present assets and liabilities accounted for at fair value on a recurring basis by hierarchy level. 

(In millions)
Derivative instruments, assets

Commodity(a) 

Derivative instruments, assets
Derivative instruments, liabilities

Derivative instruments, liabilities

(In millions)
Derivative instruments, assets

Derivative instruments, assets
Derivative instruments, liabilities

$
$

$

$

December 31, 2018

Level 1

Level 2

Level 3

Total

21
21

$
$

106
106

$
$

— $
— $

— $

— $

— $

127
127

—

December 31, 2017

Level 1

Level 2

Level 3

Total

Commodity(a) 

(20) $
(20) $
(a)   Derivative instruments are recorded on a net basis in our consolidated balance sheet (see Note 14).

Derivative instruments, liabilities

$
$

(120) $
(120) $

— $

— $

— $

— $
— $

—

(140)
(140)

Commodity derivatives include three-way collars, basis swaps, and NYMEX roll basis swaps.  These instruments are 

measured at fair value using either a Black-Scholes or a modified Black-Scholes Model.  For basis swaps and NYMEX roll 
basis swaps, inputs to the models include only commodity prices and interest rates and are categorized as Level 1 because all 
assumptions and inputs are observable in active markets throughout the term of the instruments.  For three-way collars, inputs 
to the models include commodity prices and implied volatility and are categorized as Level 2 because predominantly all 
assumptions and inputs are observable in active markets throughout the term of the instruments.   

Historically, both our interest rate swaps and forward starting interest rate swaps were measured at fair value with a market 

approach using actionable broker quotes, which are Level 2 inputs.  See Note 14 for additional discussion of the types of 
derivative instruments we used.  

Fair Values – Goodwill

See Note 13 for detail information relating to goodwill.

Fair Values – Nonrecurring

See Note 5 and Note 11 for detail on our fair values for nonrecurring items, such as impairments.

Fair Values – Financial Instruments  

Our current assets and liabilities include financial instruments, the most significant of which are receivables, the current 
portion of our long-term debt and payables. We believe the carrying values of our receivables and payables approximate fair 
value.  Our fair value assessment incorporates a variety of considerations, including (1) the short-term duration of the 
instruments, (2) our credit rating, and (3) our historical incurrence of and expected future insignificance of bad debt expense, 
which includes an evaluation of counterparty credit risk. 

85

 
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

The following table summarizes financial instruments, excluding receivables, payables and derivative financial 

instruments, and their reported fair values by individual balance sheet line item at December 31, 2018 and 2017.

(In millions)
Financial assets

Current assets(a)
Other noncurrent assets

Total financial assets

Financial liabilities

Other current liabilities
Long-term debt, including current portion(b)
Deferred credits and other liabilities

Total financial liabilities

December 31,

2018

2017

Fair
Value

Carrying
Amount

Fair
Value

Carrying
Amount

$

$

$

$

13
76
89

37
5,469
93
5,599

$

$

$

$

13
81
94

58
5,528
88
5,674

$

$

$

$

762
135
897

32
5,976
110
6,118

$

$

$

$

761
137
898

43
5,526
103
5,672

(a)  December 31, 2017 fair value and carrying amounts included our two notes receivable relating to the sale of our Canadian business; both were paid during 

(b) 

the first quarter of 2018, see Note 5 for further information.
Excludes capital leases and debt issuance costs.

Fair values of our notes receivable and our financial assets included in other noncurrent assets, and of our financial 
liabilities included in other current liabilities and deferred credits and other liabilities, are measured using an income approach 
and most inputs are internally generated, which results in a Level 3 classification.  Estimated future cash flows are discounted 
using a rate deemed appropriate to obtain the fair value.

All of our long-term debt instruments are publicly traded.  A market approach, based upon quotes from major financial 

institutions, which are Level 2 inputs, is used to measure the fair value of our debt. 

16.  Debt

Revolving Credit Facility 

As of December 31, 2018, we had no borrowings against our $3.4 billion unsecured revolving credit facility (as amended, 

the "Credit Facility"), as described below.

In October 2018, we extended the maturity date of our Credit Facility from May 28, 2021 to May 28, 2022. Fees on the 
unused commitment to the lenders, as well as the borrowing options under the Credit Facility, remain unaffected by the term 
extension.  We retain the ability to request two one-year extensions and an option to increase the commitment amount by up to 
an additional $107 million, subject to the consent of any increasing lenders.  The sub-facilities for swing-line loans and letters 
of credit remain unchanged allowing up to an aggregate amount of $100 million and $500 million, respectively.  

The Credit Facility includes a covenant requiring that our ratio of total debt to total capitalization not exceed 65% as of the 

last day of each fiscal quarter. If an event of default occurs, the lenders holding more than half of the commitments may 
terminate the commitments under the Credit Facility and require the immediate repayment of all outstanding borrowings and 
the cash collateralization of all outstanding letters of credit under the Credit Facility.  As of December 31, 2018, we were in 
compliance with this covenant with a debt-to-capitalization ratio of 31%.

86

 
 
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

Long-term debt

The following table details our long-term debt:

(In millions)

Senior unsecured notes:

2.700% notes due 2020(a)
 2.800% notes due 2022(a)
9.375% notes due 2022(b)
Series A notes due 2022(b)
8.500% notes due 2023(b)
8.125% notes due 2023(b)
3.850% notes due 2025(a)
4.400% notes due 2027(a)
6.800% notes due 2032(a)
6.600% notes due 2037(a)
5.200% notes due 2045(a)

Total(b) 

Unamortized discount
Unamortized debt issuance cost

December 31,

2018

2017

600
1,000
32
3
70
131
900
1,000
550
750
500
5,536
(8)
(29)
5,499

$

$

600
1,000
32
3
70
131
900
1,000
550
750
500
5,536
(10)
(32)
5,494

$

$

Total long-term debt
(a) 

(b) 

These notes contain a make-whole provision allowing us to repay the debt at a premium to market price.
In the event of a change in control, as defined in the related agreements, debt obligations totaling $236 million at December 31, 2018 may be declared 
immediately due and payable.

The following table shows future debt payments:

(In millions)
2019
2020
2021
2022
2023
Thereafter

Total long-term debt, including current portion

Debt Issuance 

$

$

—
600
—
1,035
201
3,700
5,536

On July 24, 2017, we issued $1 billion in senior unsecured notes that will mature on July 15, 2027.  Interest on the senior 

unsecured notes is payable semi-annually beginning January 15, 2018.  We may redeem some or all of the senior unsecured 
notes at any time at the applicable redemption price, plus accrued interest, if any.  We used the net proceeds of $990 million 
plus existing cash on hand to redeem the following senior unsecured notes:

• 
• 
• 

$682 million 6.0% Notes Due in 2017
$854 million 5.9% Notes Due in 2018
$228 million 7.5% Notes Due in 2019

As a result of the above redemption of $1.76 billion in senior unsecured notes, we recognized a loss on early 

extinguishment of debt of $46 million, primarily due to make-whole call provisions.  In connection with the redemption of the 
senior unsecured notes, we terminated our forward starting interest rate swaps, which resulted in proceeds of $54 million and a 
gain of approximately $46 million into earnings in 2017.  See Note 14 for further detail on our historical forward starting 
interest rate swaps.

87

 
 
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

Debt Redemption

In December 2017, we entered into a transaction to purchase $1 billion of 3.75% municipal revenue bonds due in 2037, to 
be issued by the Parish of St. John the Baptist, State of Louisiana (the "Parish").  The Parish will use the proceeds to redeem $1 
billion of 5.125% municipal revenue bonds due in 2037 with cash on hand in a refunding transaction.  We purchased the $1 
billion of 3.75% municipal revenue bonds due in 2037 on their date of issuance to hold for our own account and potential 
remarketing to the public at a future date.

17.  Incentive Based Compensation

Description of stock-based compensation plans – The Marathon Oil Corporation 2016 Incentive Compensation Plan (the 

"2016 Plan") was approved by our stockholders in May 2016 and authorizes the Compensation Committee of the Board of 
Directors to grant stock options, SARs, stock awards (including restricted stock and restricted stock unit awards) and 
performance unit awards to employees.  The 2016 Plan also allows us to provide equity compensation to our non-employee 
directors.  No more than 55 million shares of our common stock may be issued under the 2016 Plan.  For stock options and 
SARs, the number of shares available for issuance under the 2016 Plan will be reduced by one share for each share of our 
common stock in respect of which the award is granted.  For stock awards (including restricted stock and restricted stock unit 
awards), the number of shares available for issuance under the 2016 Plan will be reduced by 2.41 shares for each share of our 
common stock in respect of which the award is granted.

Shares subject to awards under the 2016 Plan that are forfeited, terminated or expire unexercised become available for 
future grants.  In addition, the number of shares of our common stock reserved for issuance under the 2016 Plan will not be 
increased by shares tendered to satisfy the purchase price of an award, exchanged for other awards or withheld to satisfy tax 
withholding obligations.  Shares issued as a result of awards granted under the 2016 Plan are generally funded out of common 
stock held in treasury, except to the extent there are insufficient treasury shares, in which case new common shares are issued.

After approval of the 2016 Plan, no new grants were or will be made from any prior plans.  Any awards previously granted 

under any prior plans shall continue to be exercisable in accordance with their original terms and conditions. 

Stock-based awards under the plans

Stock options – We grant stock options under the 2016 Plan.  Our stock options represent the right to purchase shares of our 

common stock at its fair market value on the date of grant.  In general, our stock options vest ratably over a three-year period 
and have a maximum term of ten years from the date they are granted.

SARs – At December 31, 2018, there are no SARs outstanding.

Restricted stock – We grant restricted stock under the 2016 Plan.  The restricted stock awards granted to officers generally 

vest three years from the date of grant, contingent on the recipient’s continued employment.  We also grant restricted stock to 
certain non-officer employees based on their performance within certain guidelines and for retention purposes.  The restricted 
stock awards to non-officers generally vest ratably over a three-year period, contingent on the recipient’s continued 
employment.  Prior to vesting, all restricted stock recipients have the right to vote such stock and receive dividends thereon.  
The non-vested shares of restricted stock are not transferable and are held by our transfer agent. 

Stock-based performance units – We grant stock-based performance units to officers under the 2016 Plan.  At the grant 

date, each unit represents the value of one share of our common stock.  These units are settled in cash, and the amount of the 
payment is based on (1) the vesting percentage, which can be from zero to 200% based on performance achieved and as 
determined by the Compensation Committee of the Board of Directors and (2) the fair market value of our common stock on 
the last day of the performance period.  The performance goals are tied to our total shareholder return (“TSR”) as compared to 
TSR for a group of peer companies determined by the Compensation Committee of our Board of Directors.  Dividend 
equivalents may accrue during the performance period and would be paid in cash at the end of the performance period based on 
the number of shares that would represent the value of the units granted multiplied by the vesting percentage.

Restricted stock units – We maintain an equity compensation program for our non-employee directors.  All non-employee 
directors receive annual grants of common stock units.  Any units granted prior to 2012 must be held until completion of board 
service, at which time the non-employee director will receive common shares.  For units granted between 2012 and 2016, 
common shares will generally vest following completion of board service or three years from the date of grant, whichever is 
earlier.  For awards issued in 2017 and later, directors may elect to defer settlement of their common stock units until after they 
cease serving on the Board.  Absent such an election to defer, common shares will vest upon the earlier of three years from the 
date of grant or completion of board service.  We also grant restricted stock units to certain non-officer international employees 
which generally vest ratably over a three-year period, contingent on the recipient's continued employment. Grants of restricted 
stock units to these non-officer international employees are based on their performance and for retention purposes.  Common 

88

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

shares will be issued for these restricted stock units after vesting.  Prior to vesting, recipients of restricted stock units typically 
receive dividend equivalent payments, but they may not vote. 

Total stock-based compensation expense – Total employee stock-based compensation expense was $53 million, $50 
million and $51 million in 2018, 2017 and 2016, while the total related income tax benefits were $19 million in 2016.  Due to 
the full valuation allowance on our net federal deferred tax assets, we realized no tax benefit during 2018 and 2017.  In 2018 
and 2016, cash received upon exercise of stock option awards was $26 million and $1 million.  There was no cash received 
upon exercise of stock option awards for 2017.  There were no tax benefits realized for deductions for stock awards settled 
during 2018, 2017 and 2016.

 Stock option awards – During 2018, 2017 and 2016 we granted stock option awards to officer employees. The weighted 

average grant date fair value of these awards was based on the following weighted average Black-Scholes assumptions:

Exercise price per share
Expected annual dividend yield
Expected life in years
Expected volatility
Risk-free interest rate
Weighted average grant date fair value of stock option awards granted

The following is a summary of stock option award activity in 2018.

2018

2017

2016

$14.52
1.4%
6.45
43%
2.8%
$5.83

$15.80
1.3%
6.4
42%
2.1%
$6.07

$7.22
2.8%
6.3
36%
1.4%
$1.97

Number
of Shares

Weighted Average
Exercise Price

Weighted Average
Remaining 
Contractual Term

Aggregate
Intrinsic Value
(in millions)

Outstanding at beginning of year

Granted

Exercised
Canceled

Outstanding at end of year

Exercisable at end of year
Expected to vest

10,330,776

856,890

(1,878,836)
(3,128,823)

6,180,007
4,523,008

1,635,216

$25.52

$14.52

$14.02
$31.64

$24.39
$28.46

$13.25

5 years
3 years

8 years

$
$

$

4
1

3

The intrinsic value of stock option awards exercised during 2018 was $13 million while it was immaterial during 2017 and 

2016. 

As of December 31, 2018, unrecognized compensation cost related to stock option awards was $5 million, which is 

expected to be recognized over a weighted average period of one year.

 Restricted stock awards and restricted stock units – The following is a summary of restricted stock and restricted stock 

unit award activity in 2018.

Unvested at beginning of year

Granted
Vested and Exercised
Canceled

Unvested at end of year

Awards

7,572,845   
4,817,577
(3,003,321)
(882,155)
8,504,946   

Weighted Average
Grant Date
Fair Value

$14.24
$14.82
$15.79
$14.06
$14.04

The vesting date fair value of restricted stock awards which vested during 2018, 2017 and 2016 was $48 million, $39 
million and $20 million.  The weighted average grant date fair value of restricted stock awards was $14.04, $14.24 and $14.44 
for awards unvested at December 31, 2018, 2017 and 2016.

As of December 31, 2018 there was $74 million of unrecognized compensation cost related to restricted stock awards 

which is expected to be recognized over a weighted average period of one year.

89

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

Stock-based performance unit awards – During 2018, 2017 and 2016 we granted 754,140, 563,631 and 1,205,517 stock-
based performance unit awards to officers.  At December 31, 2018, there were 1,196,176 units outstanding.  Total stock-based 
performance unit awards expense was $13 million in 2018, $8 million in 2017 and $6 million in 2016. 

The key assumptions used in the Monte Carlo simulation to determine the fair value of stock-based performance units 

granted in 2018, 2017 and 2016 were:

Valuation date stock price
Expected annual dividend yield
Expected volatility
Risk-free interest rate
Fair value of stock-based performance units outstanding

2018

2017

2016

$14.17
1.4%
39%
2.5%
$19.60

$14.17
1.4%
43%
2.6%
$19.45

$14.17
1.4%
52%
2.4%
$21.51

18.  Defined Benefit Postretirement Plans and Defined Contribution Plan

We have noncontributory defined benefit pension plans covering substantially all domestic employees, as well as U.K. 
employees who were hired before April 2010. Certain employees located in E.G., who are U.S. or U.K. based, also participate 
in these plans. Benefits under these plans are based on plan provisions specific to each plan.  For the U.K. pension plan, the 
principal employer and plan trustees reached a decision to close the plan to future benefit accruals effective December 31, 2015.

We also have defined benefit plans for other postretirement benefits covering our U.S. employees.  Health care benefits are 

provided up to age 65 through comprehensive hospital, surgical and major medical benefit provisions subject to various cost-
sharing features. Post-age 65 health care benefits are provided to certain U.S. employees on a defined contribution basis.  Life 
insurance benefits are provided to certain retiree beneficiaries.  These other postretirement benefits are not funded in advance. 
Employees hired after 2016 are not eligible for any postretirement health care or life insurance benefits.

90

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

Obligations and funded status – The following summarizes the obligations and funded status for our defined benefit 

pension and other postretirement plans. 

(In millions)
Accumulated benefit obligation
Change in benefit obligations:

Beginning balance
Service cost
Interest cost
Plan amendment
Actuarial loss (gain)
Foreign currency exchange rate changes
Settlements paid
Benefits paid
Ending balance

Change in fair value of plan assets:

Beginning balance

Actual return on plan assets
Employer contributions
Foreign currency exchange rate changes
Settlements paid
Benefits paid
Ending balance

Funded status of plans at December 31

Amounts recognized in the consolidated balance
sheets:

Noncurrent assets
Current liabilities
Noncurrent liabilities

Accrued benefit cost

Pretax amounts in accumulated other comprehensive
loss:
Net loss (gain)
Prior service cost (credit)

Pension Benefits

2018

2017

U.S.

Int’l

U.S.

Int’l

Other Benefits
2017
2018
U.S.
U.S.

$

$

$

$

$
$

$

$

$

320

384
18
12
—
(20)
—
(62)
(6)
326

$

$

$

$

216
(6)
61
—
(62)
(6)
$
203
(123) $

— $
(5)
(118)
(123) $

$

90
(36)

$

$

$

$

$
$

$

$

$

511

599
—
14
3
(38)
(29)
(23)
(15)
511

670
(21)
17
(34)
(23)
(15)
594
83

83
—
—
83

59
5

378

397
22
13
—
42
—
(84)
(6)
384

$

$

$

$

227
27
52
—
(84)
(6)
$
216
(168) $

— $
(6)
(162)
(168) $

$

122
(45)

$

$

$

$

$
$

$

$

$

599

583
—
17
—
(7)
52
(31)
(15)
599

595
47
17
57
(31)
(15)
670
71

71
—
—
71

58
3

96

221
2
7
(99)
(15)
—
—
(20)
96

$

$

$

— $
—
20
—
—
(20)
— $
(96) $

— $
(19)
(77)
(96) $

221

227
2
8
—
5
—
—
(21)
221

—
—
21
—
—
(21)
—
(221)

—
(21)
(200)
(221)

$

14
(147)

30
(56)

91

 
 
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

Components of net periodic benefit cost from continuing operations and other comprehensive (income) loss – The 

following summarizes the net periodic benefit costs and the amounts recognized as other comprehensive (income) loss for our 
defined benefit pension and other postretirement plans.

2
8
—

(7)
—
—
3

5
—
—
7

12

15

$

$

$

$

$

2
11
—

(3)
—
—
10

11
—
(38)
3

(24)

(14)

Pension Benefits
Year Ended December 31,
2017

2016

2018

U.S.

Int’l

U.S.

Int’l

U.S.

Int’l

Other Benefits
Year Ended December 31,
2016
2017
2018
U.S.
U.S.
U.S.

$ 18
12
(11)

$ — $ 22
13
(13)

14
(24)

$ — $ 25
16
(18)

17
(30)

$ — $
23
(35)

(10) — (10) — (10)
14
8
11
97
28
18
$ (8) $ 124
$ (7) $ 48
$ 38

—
3

1
4

1
—
6
$ (5) $

2
7
—

(8)
1
—
2

$

$

(In millions)
Components of net periodic benefit cost:

Service cost
Interest cost
Expected return on plan assets
Amortization:

- prior service cost (credit)
- actuarial loss
Net settlement loss(a)
Net periodic benefit cost(b)
Other changes in plan assets and benefit
obligations recognized in other
comprehensive (income) loss (pretax):

Actuarial loss (gain)
Amortization of actuarial gain (loss)
Prior service cost (credit)
Amortization of prior service credit (cost)

$ (4) $
(29)
—
10

8
(3)
3
—

$ 28
(36)
—
10

$ (26) $ 70
(111)
—
10

(4)
—
—

$ 41
(6)
1
(1)

$

(15) $
(1)
(99)
8

Total recognized in other comprehensive
(income) loss

Total recognized in net periodic benefit cost
and other comprehensive (income) loss

$ (23) $

$ 15

$

8

1

$

2

$ (30) $ (31) $ 35

$ (107) $

$ 50

$ (38) $ 93

$ 30

$ (105) $

(a) 

Settlements are recognized as they occur, once it is probable that lump sum payments from a plan for a given year will exceed the plan’s total service and 
interest costs for that year.

(b)  Net periodic benefit cost reflects a calculated market-related value of plan assets which recognizes changes in fair value over three years.

The estimated net loss and prior service credit for our defined benefit pension plans that will be amortized from 

accumulated other comprehensive loss into net periodic benefit cost in 2019 are $7 million and $7 million.  The estimated net 
loss and prior service credit for our other defined benefit postretirement plans that will be amortized from accumulated other 
comprehensive loss into net periodic benefit cost in 2019 are $1 million and $18 million.

Plan assumptions – The following summarizes the assumptions used to determine the benefit obligations at December 31, 

and net periodic benefit cost for the defined benefit pension and other postretirement plans for 2018, 2017 and 2016.

(In millions)
Weighted average assumptions used
to determine benefit obligation:

2018

Pension Benefits
2017

2016

U.S.

Int’l

U.S.

Int’l

U.S.

Int’l

Other Benefits
2017
U.S.

2018
U.S.

2016
U.S.

Discount rate
Rate of compensation increase(a)

4.26% 2.90% 3.55% 2.50% 4.02% 2.70%
4.00% —% 4.00% —% 4.00% —%

4.09%
4.00%

3.54% 3.98%
4.00% 4.00%

Weighted average assumptions used
to determine net periodic benefit
cost:

Discount rate
Expected long-term return on plan
assets
Rate of compensation increase(a)

3.88% 2.50% 3.86% 2.70% 3.66% 3.90%

3.54%

3.98% 4.36%

6.50% 3.70% 6.50% 4.50% 6.75% 5.50%
4.00% —% 4.00% —% 4.00% —%

—%
4.00%

—%

—%
4.00% 4.00%

(a)  No future benefits will be incurred for the U.K. plan after December 31, 2015. Therefore, rate of compensation increase is no longer applicable to this 

plan.

92

 
 
 
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

Expected long-term return on plan assets – The expected long-term return on plan assets assumption for our U.S. funded 
plan is determined based on an asset rate-of-return modeling tool developed by a third-party investment group which utilizes 
underlying assumptions based on actual returns by asset category and inflation and takes into account our U.S. pension plan’s 
asset allocation.  To determine the expected long-term return on plan assets assumption for our international plans, we consider 
the current level of expected returns on risk-free investments (primarily government bonds), the historical levels of the risk 
premiums associated with the other applicable asset categories and the expectations for future returns of each asset class.  The 
expected return for each asset category is then weighted based on the actual asset allocation to develop the overall expected 
long-term return on plan assets assumption. 

Assumed weighted average health care cost trend rates

Initial health care trend rate
Ultimate trend rate
Year ultimate trend rate is reached
N/A   All retiree medical subsidies are frozen as of January 1, 2019. 

2018

2017

2016

N/A
N/A
N/A

8.00%
4.70%
2025

8.25%
4.50%
2025

Employer provided subsidies for post-65 retiree health care coverage were frozen effective January 1, 2017 at January 1, 

2016 established amount levels. Company contributions are funded to a Health Reimbursement Account on the retiree’s behalf 
to subsidize the retiree’s cost of obtaining health care benefits through a private exchange (the “post-65 retiree health benefits”).   
Therefore, a 1% change in health care cost trend rates would not have a material impact on either the service and interest cost 
components and the postretirement benefit obligations.

     In the fourth quarter of 2018, we terminated the post-65 retiree health benefits effective as of December 31, 2020. The 
post-65 retiree health benefits will no longer be provided after that date. In addition, the pre-65 retiree medical coverage 
subsidy has been frozen as of January 1, 2019, and the ability for retirees to opt in and out of this coverage, as well as pre-65 
retiree dental and vision coverage, has also been eliminated. Retirees must enroll in connection with retirement for such 
coverage, or they lose eligibility. These plan changes reduced our retiree medical benefit obligation by approximately $99 
million.

Plan investment policies and strategies – The investment policies for our U.S. and international pension plan assets reflect 
the funded status of the plans and expectations regarding our future ability to make further contributions.  Long-term investment 
goals are to: (1) manage the assets in accordance with applicable legal requirements; (2) produce investment returns which meet 
or exceed the rates of return achievable in the capital markets while maintaining the risk parameters set by the plan's investment 
committees and protecting the assets from any erosion of purchasing power; and (3) position the portfolios with a long-term risk/
return orientation.  Investment performance and risk is measured and monitored on an ongoing basis through quarterly investment 
meetings and periodic asset and liability studies.

U.S. plan – The plan’s current targeted asset allocation is comprised of 55% equity securities and 45% other fixed income 
securities. Over time, as the plan’s funded ratio (as defined by the investment policy) improves, in order to reduce volatility in 
returns and to better match the plan’s liabilities, the allocation to equity securities will decrease while the amount allocated to 
fixed income securities will increase. The plan's assets are managed by a third-party investment manager. 

International plan – Our international plan's target asset allocation is comprised of 55% equity securities and 45% fixed 
income securities.  The plan assets are invested in ten separate portfolios, mainly pooled fund vehicles, managed by several 
professional investment managers whose performance is measured independently by a third-party asset servicing consulting 
firm. 

Fair value measurements – Plan assets are measured at fair value.  The following provides a description of the valuation 

techniques employed for each major plan asset class at December 31, 2018 and 2017.

Cash and cash equivalents – Cash and cash equivalents are valued using a market approach and are considered Level 1. 

Equity securities – Investments in common stock are valued using a market approach at the closing price reported in an 

active market and are therefore considered Level 1. Private equity investments include interests in limited partnerships which 
are valued based on the sum of the estimated fair values of the investments held by each partnership, determined using a 
combination of market, income and cost approaches, plus working capital, adjusted for liabilities, currency translation and 
estimated performance incentives.  These private equity investments are considered Level 3.  Investments in pooled funds are 
valued using a market approach, these various funds consist of equity with underlying investments held in U.S. and non-U.S. 
securities. The pooled funds are benchmarked against a relative public index and are considered Level 2.

93

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

Fixed income securities – Fixed income securities are valued using a market approach.  U.S. treasury notes and exchange 
traded funds ("ETFs") are valued at the closing price reported in an active market and are considered Level 1.  Corporate bonds, 
private placements, and GNMA/FNMA/FHLMC pools are valued using calculated yield curves created by models that 
incorporate various market factors.  Primarily investments are held in U.S. and non-U.S. corporate bonds in diverse industries 
and are considered Level 2.  Other fixed income investments include futures contracts, real estate investment trusts, credit 
default, zero coupon, interest rate swaps.  Investments in pooled funds are valued using a market approach, and primarily have 
investments held in U.S. and non-U.S. publicly traded investment grade government and corporate bonds and are considered 
Level 2. 

Other – Other investments are comprised of an unallocated annuity contract, two limited liability companies,  and real 

estate.  All are considered Level 3, as significant inputs to determine fair value are unobservable.

Commingled funds – The investment in the commingled funds are valued using the net asset value of units held as a 
practical expedient.  The commingled funds consist of equity and fixed income portfolios with underlying investments held in 
U.S. and non-U.S. securities.  

The following tables present the fair values of our defined benefit pension plan's assets, by level within the fair value 

hierarchy, as of December 31, 2018 and 2017.

(In millions)

Level 1

Level 2

Level 3

Total

December 31, 2018

Cash and cash equivalents(a)
Equity securities:
Common stock
Private equity
Pooled funds

Fixed income securities:

Corporate
Government
  Pooled funds
Other
Total investments, at fair value

Commingled funds(b)

Total investments

U.S.

Int’l

U.S.

Int’l

U.S.

Int’l

U.S.

Int’l

$

(1) $

5

$ — $ — $ — $ — $

(1) $

5

75
—
—

—
22
—
—
96
—
96

$

—
—
—

—
—
—
—
5
—
5

$

—
—
—

4
9
—
—
13
—
13

$

—
—
191

—
—
398
—
589
—
589

$

—
14
—

—
3
—
17
34
—
34

—
—
—

—
—
—
—
—
—
$ — $

75
14
—

4
34
—
17
143
60
203

$

—
—
191

—
—
398
—
594
—
594

$

(In millions)

Level 1

Level 2

Level 3

Total

December 31, 2017

U.S.

Int’l

U.S.

Int’l

U.S.

Int’l

U.S.

Int’l

$

6

$

1

$ — $ — $ — $ — $

6

$

1

Cash and cash equivalents
Equity securities:
Common stock
Private equity
Pooled funds

Fixed income securities:

Corporate
Exchange traded funds
Government
Pooled funds

Other
Total investments, at fair value

Commingled funds(b)

81
—
—

—
—
—

—
—
—

—
—
266

6
—
2
—
—
8
—
8

—
—
—
403
—
669
—
669

—
5
19
—
—
111
—
111

—
—
—
—
—
1
—
1

94

—
16
—

—
—
3
—
19
38
—
38

—
—
—

—
—
—
—
—
—
—
$ — $

81
16
—

6
5
24
—
19
157
59
216

$

—
—
266

—
—
—
403
—
670
—
670

Total investments
$
$
(a)    The negative cash balance was due to the timing of when investment trades occur and when they settle. 

$

$

$

  
  
  
  
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

(b)    After the adoption of the FASB update for the fair value hierarchy, we separately report the investments for which fair value was measured using the net 
asset value per share as a practical expedient.  Amounts presented in this table are intended to reconcile the fair value hierarchy to the pension plan assets.  
See Note 2 for further information on the FASB update.

The activity during the year ended December 31, 2018 and 2017, for the assets using Level 3 fair value measurements was 

immaterial.

Cash flows

Estimated future benefit payments – The following gross benefit payments, which were estimated based on actuarial 
assumptions applied at December 31, 2018 and reflect expected future services, as appropriate, are to be paid in the years 
indicated.

(In millions)
2019
2020
2021
2022
2023
2024 through 2028

Pension Benefits

U.S.

Int’l

Other Benefits
U.S.

$

$

38
34
31
29
27
114

$

18
18
20
21
23
127

18
18
9
8
7
27

Contributions to defined benefit plans – We expect to make contributions to the funded pension plans of up to $50 million 
in 2019.  Cash contributions to be paid from our general assets for the unfunded pension and postretirement plans are expected 
to be approximately $5 million and $18 million in 2019.

Contributions to defined contribution plans – We contribute to several defined contribution plans for eligible employees. 

Contributions to these plans totaled $22 million, $20 million and $20 million in 2018, 2017 and 2016.

19.  Reclassifications Out of Accumulated Other Comprehensive Income (Loss) 

The following table presents a summary of amounts reclassified from accumulated other comprehensive income (loss):

(In millions)
Postretirement and postemployment plans

Amortization of prior service credit
Amortization of actuarial loss

Net settlement loss

Derivative hedges

Recognized gain on terminated derivative
hedge

     Ineffective portion of derivative hedge

Year Ended
December 31,

2018

2017

Income Statement Line

$

18

$

(12)
(21)

—
—

(15)

1
(14) $

Other net periodic benefit costs
17
(9) Other net periodic benefit costs
(32) Other net periodic benefit costs

46
1

23
(40)
(17)

Net interest and other

Net interest and other
Income (loss) from continuing operations before
income taxes
(Provision) benefit for income taxes
Income (loss) from continuing operations

Total reclassifications to expense, net of tax
Foreign currency hedges

$

Net recognized loss in discontinued
operations, net of tax

Total reclassifications to expense

—

$

(14) $

Income (loss) from discontinued operations

(30)
(47) Net income (loss)

95

 
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

20.  Supplemental Cash Flow Information

(In millions)
Net cash used in operating activities:

Interest paid, net of amounts capitalized
Income taxes paid to taxing authorities(a)

Noncash investing activities, related to continuing operations:

Increase (decrease) asset retirement costs
Asset retirement obligations assumed by buyer
Notes receivable for disposition of assets

Year Ended December 31,
2017

2016

2018

$

$

(270) $
(323)

(183) $
(82)
—

(379) $
(391)

(202) $
14
748

(375)
(84)

110
40
—

(a) 2017 includes a payment of $108 million made to the U.K. tax authorities to preserve our appeal rights, see Note 25 for additional discussion.

Other noncash investing activities include accrued capital expenditures as of December 31, 2018, 2017 and 2016 of $250 

million, $329 million and $155 million.

21.    Other Items

Net interest and other 

(In millions)
Interest:

Interest income
Interest expense
Income on interest rate swaps
Interest capitalized
Total interest

Other:

Net foreign currency gain (loss)
Other

Total other
Net interest and other

Year Ended December 31,
2017

2016

2018

$

$

$

32
(280)
—
—
(248)

9
13
22
(226) $

$

34
(380)
53
3
(290)

8
12
20
(270) $

14
(398)
13
18
(353)

6
15
21
(332)

Foreign currency – Aggregate foreign currency gains (losses) were included in the consolidated statements of income as 

follows:

(In millions)
Net interest and other
Provision for income taxes

Aggregate foreign currency gains (losses)

Year Ended December 31,
2017

2016

2018

$

$

9
10
19

$

$

8
57
65

$

$

6
(32)
(26)

96

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

22.  Equity Method Investments 

During 2018, 2017 and 2016 our equity method investees were considered related parties and included: 

•  EGHoldings, in which we have a 60% noncontrolling interest.  EGHoldings is engaged in LNG production activity.
•  Alba Plant LLC, in which we have a 52% noncontrolling interest.  Alba Plant LLC processes LPG.
•  AMPCO, in which we have a 45% interest.  AMPCO is engaged in methanol production activity.

Our equity method investments are summarized in the following table:

(In millions)
EGHoldings
Alba Plant LLC
AMPCO
Total

Ownership as of
December 31, 2018
60%
52%
45%

$

$

December 31,

2018

2017

402
167
176
745

$

$

456
214
177
847

Dividends and partnership distributions received from equity method investees (excluding distributions that represented a 

return of capital previously contributed) were $270 million in 2018, $276 million in 2017 and $192 million in 2016.

Summarized financial information for equity method investees is as follows:  

(In millions)
Income data – year:(a)

Revenues and other income
Income from operations
Net income

Balance sheet data – December 31:

Current assets
Noncurrent assets
Current liabilities
Noncurrent liabilities

2018

2017

2016

$

$

$

$

1,269
588
459

559
931
253
87

$

1,294
631
508

586
1,044
221
94

770
346
313

(a) 

See Item 15 Exhibits, Financial Statement Schedules which contains the Alba Plant LLC unaudited financial statements, which have been included 
pursuant to Rule 3-09 of Regulation S-X.

Revenues from related parties were $48 million, $60 million and $54 million in 2018, 2017 and 2016, with the majority 
related to EGHoldings in all years.  We had no purchases from related parties in 2018 and $132 million and $103 million in 
2017 and 2016 with the majority related to Alba Plant LLC in all years.

Current receivables from related parties at December 31, 2018 and 2017, were $25 million and $24 million with the 
majority related to EGHoldings.  Payables to related parties were $15 million and $14 million at December 31, 2018 and 2017, 
with the majority related to Alba Plant LLC.

23.  Stockholders’ Equity

During 2018 we acquired 36 million of common shares at a cost of $700 million under our share repurchase program.  As 
of December 31, 2018 the total remaining share repurchase authorization was $800 million.  Purchases under the program are 
made at our discretion and may be in either open market transactions, including block purchases, or in privately negotiated 
transactions using cash on hand, cash generated from operations, proceeds from potential asset sales or cash from available 
borrowings to acquire shares.  This program may be changed based upon our financial condition or changes in market 
conditions and is subject to termination prior to completion. The repurchase program does not include specific price targets or 
timetables.  Shares repurchased as of December 31, 2018 were held as treasury stock. There were no share repurchases during 
2017 under our publicly announced plans or programs. 

97

 
 
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

24.  Leases

We lease a wide variety of facilities and equipment under operating leases, including land, building space, equipment and 

vehicles.  Most long-term leases include renewal options and, in certain leases, purchase options.  Future minimum 
commitments for operating lease obligations having noncancellable lease terms in excess of one year are as follows:

(In millions)
2019
2020
2021
2022
2023
Later years
Sublease rentals

Total minimum lease payments

* Future minimum commitments for capital lease obligations are nil as of December 31, 2018.

Operating Lease
Obligations

$

$

62
54
35
12
5
49
—
217

Operating lease rental expense related to continuing operations was $99 million, $87 million and $87 million in 2018, 2017 

and 2016. 

25.  Commitments and Contingencies

The U.K. tax authorities have challenged the timing of deductibility for certain Brae area decommissioning costs, which we 

claimed for U.K. corporation tax purposes.  The dispute relates to the timing of the deduction and does not dispute the general 
deductibility of decommissioning costs.  In the fourth quarter of 2017, we received notification from the U.K.’s First-tier 
Tribunal that the decommissioning cost deductions, which we had claimed, were not allowable.  In accordance with U.K. 
regulations, in the fourth quarter of 2017, we paid the amount of tax and interest in question, approximately $108 million, prior 
to our appeal.  In the first quarter of 2019 we withdrew our appeal on this matter, the resulting revisions to current and deferred 
tax liabilities are expected to have no cumulative adverse earnings impact on our consolidated results of operations.  See Note 8 
for further detail.

We are continuously undergoing examination of our U.S. federal income tax returns by the IRS.  These audits have been 

completed through the 2014 tax year, except for tax years 2010 and 2011. During the third quarter of 2017, we received a 
partnership adjustment notification related to the 2010 and 2011 tax years, for which we have filed a Tax Court Petition in the 
fourth quarter of 2017.  We believe that it is more likely than not that we will prevail.  See Note 8 for further detail.

We are a defendant in a number of legal and administrative proceedings arising in the ordinary course of business 

including, but not limited to, royalty claims, contract claims, tax disputes and environmental claims. While the ultimate 
outcome and impact to us cannot be predicted with certainty, we believe the resolution of these proceedings will not have a 
material adverse effect on our consolidated financial position, results of operations or cash flows.  Certain of these matters are 
discussed below.

Environmental matters – We have incurred and will continue to incur capital, operating and maintenance, and remediation 
expenditures as a result of environmental laws and regulations.  If these expenditures, as with all costs, are not ultimately offset 
by the prices we receive for our products and services, our operating results will be adversely affected.  We believe that 
substantially all of our competitors must comply with similar environmental laws and regulations.  However, the specific 
impact on each competitor may vary depending on a number of factors, including the age and location of its operating facilities, 
marketing areas and production processes.  These laws generally provide for control of pollutants released into the environment 
and require responsible parties to undertake remediation of hazardous waste disposal sites.  Penalties may be imposed for 
noncompliance.

At December 31, 2018 and 2017, accrued liabilities for remediation were not material.  It is not presently possible to 

estimate the ultimate amount of all remediation costs that might be incurred or the penalties that may be imposed.

Guarantees – Over the years, we have sold various assets in the normal course of our business.  Certain of the related 

agreements contain performance and general guarantees, including guarantees regarding inaccuracies in representations, 
warranties, covenants and agreements, and environmental and general indemnifications that require us to perform upon the 
occurrence of a triggering event or condition.  These guarantees and indemnifications are part of the normal course of selling 
assets.  We are typically not able to calculate the maximum potential amount of future payments that could be made under such 

98

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements

contractual provisions because of the variability inherent in the guarantees and indemnities.  Most often, the nature of the 
guarantees and indemnities is such that there is no appropriate method for quantifying the exposure because the underlying 
triggering event has little or no past experience upon which a reasonable prediction of the outcome can be based.

Contract commitments – At December 31, 2018 and 2017, contractual commitments to acquire property, plant and 

equipment totaled $57 million and $102 million. 

In connection with the sale of our operated producing properties in the greater Ewing Bank area and non-operated 

producing interests in the Petronius and Neptune fields in the Gulf of Mexico, we retained an overriding royalty interest in the 
properties.  As part of the sale agreement, proceeds associated with the production of our override, up to $70 million, are 
dedicated solely to the satisfaction of the corresponding future abandonment obligations of the properties.  The term of our 
override ends once sales proceeds equal $70 million.

99

Select Quarterly Financial Data (Unaudited)

(In millions, except per share data)
Revenues from contracts with
customers
Income (loss) from continuing 
operations before income taxes(a)(b)
Income (loss) from continuing
operations
Discontinued operations(c)
Net income (loss)

2018

2017

1st Qtr. 2nd Qtr.

3rd Qtr.

4th Qtr.

1st Qtr.

2nd Qtr.

3rd Qtr.

4th Qtr.

$ 1,537

$ 1,447

$ 1,538

$ 1,380

$

873

$

902

$ 1,136

$ 1,336

524

356
—
356

$

140

96
—
96

$

$

357

254
—
254

406

(16)

(112)

(458)

132

(50)
390
— (4,907)
390

$ (4,957) $

(153)
14
(139) $

(599)
—
(599) $

(28)
—
(28)

$

Income (loss) per basic share:
Continuing operations
Discontinued operations(c)
Net income (loss)
$
Dividends paid per share
(a)   For 2018, includes unproved property impairments and exploratory dry well costs of $49 million in the fourth quarter of 2018.  For 2017, includes 

$ (0.06) $
— $ — $ (5.78) $
$ (5.84) $
$
0.05
$

(0.18) $ (0.70) $ (0.03)
0.02
$ — $ —
(0.16) $ (0.70) $ (0.03)
0.05
0.05
0.05

$ 0.42
$
$ — $
$
$ 0.42
$
$ 0.05

$
— $
$
$

0.47
0.05

0.11
0.05

0.30
0.05

0.30

0.47

0.11

$
$

$

$

impairments to proved properties of $201 million and $24 million in the third quarter and fourth quarter, respectively.  Also includes unproved property 
impairments and exploratory dry well costs of $215 million in the third quarter of 2017. (See Item 8. Financial Statements and Supplementary Data – Note 
11 to the consolidated financial statements).  

(b)   The fourth quarter of 2018 includes a mark-to-market gain on commodity derivatives of $336 million.  Additionally, the first quarter of 2018 includes a 
gain on sale of our Libya subsidiary of $255 million.   (See Item 8. Financial Statements and Supplementary Data – Note 5 to the consolidated financial 
statements).  

(c)    We closed on the sale of our Canadian business in the second quarter of 2017.  The Canadian business is reflected as discontinued operations in all periods 
presented.  Included in the first quarter of 2017 is an after-tax non-cash impairment charge of $4.96 billion, primarily related to the property, plant, and 
equipment. 

100

 
Supplementary Information on Oil and Gas Producing Activities (Unaudited)

The supplementary information is disclosed by the following geographic areas: the U.S.; E.G.; Libya; and Other 

International ("Other Int’l"), which includes the U.K., Gabon and the Kurdistan Region of Iraq.  We closed on the sale of our 
subsidiary, Marathon Oil Libya Limited, in 2018 and have not reflected this business as discontinued operations ("Disc Ops") in 
the periods presented. We closed the sale of our Canada business in 2017 and have reflected this business as Disc Ops in 2017 
and 2016.  See Note 5 for further details on dispositions.

Preparation of Reserve Estimates

All estimates of reserves are made in compliance with SEC Rule 4-10 of Regulation S-X.  Crude oil and condensate, NGL, 
natural gas and our historical synthetic crude oil reserve estimates are reviewed and approved by our Corporate Reserves Group 
("CRG"), which includes our Director of Corporate Reserves and his staff of Reserve Coordinators.  Crude oil and condensate, 
NGLs and natural gas reserve estimates are developed or reviewed by Qualified Reserves Estimators ("QREs").  QREs are 
petro-technical professionals located throughout our organization who meet the qualifications we have established for 
employees engaged in estimating reserves and resources.  QREs have the education, experience, and training necessary to 
estimate reserves and resources in a manner consistent with all external reserve estimation regulations and internal resource 
estimation directives and practices. QREs generally hold at least a Bachelor of Science degree in the appropriate technical field, 
have a minimum of three years of industry experience with at least one year in reserve estimation and have completed our QRE 
training course.  All reserves changes (including proved) must be approved by the CRG.  Additionally, any change to proved 
reserve estimates in excess of 5 mmboe on a total field basis, within a single month, must be approved by the Director of 
Corporate Reserves.

The Director of Corporate Reserves, who reports to our Chief Financial Officer, has a Bachelor of Science degree in 
petroleum engineering and is a registered Professional Engineer in the State of New Mexico.  In his 32 years with Marathon 
Oil, he has held numerous engineering and management positions, including managing reservoir engineering and geoscience 
for our Eagle Ford development in South Texas.  He is a 25 year member of the Society of Petroleum Engineers ("SPE"). 

Technologies used in proved reserves estimation includes statistical analysis of production performance, decline curve 
analysis, pressure and rate transient analysis, pressure gradient analysis, reservoir simulation and volumetric analysis. The 
observed statistical nature of production performance coupled with highly certain reservoir continuity or quality within the 
reliable technology areas and sufficient proved developed locations establish the reasonable certainty criteria required for 
booking proved reserves.

Audits of Estimates

We engage third-party consultants to provide, at a minimum, independent estimates for fields that comprise 80% of our 
total proved reserves over a rolling four-year period.  We exceeded this percentage for the four-year period ended December 31, 
2018, with 94% of our total proved reserves independently audited.  An audit tolerance at a field level of +/- 10% to our internal 
estimates has been established.  Should the third-party consultants’ initial analysis fall outside our tolerance band, both parties 
will re-examine the information provided, request additional data and refine their analysis, if appropriate.  In the very limited 
instances where differences outside the 10% tolerance cannot be resolved by year end, a plan to resolve the difference is 
developed and executive management consent is obtained.  The audit process did not result in any significant changes to our 
reserve estimates for 2018, 2017 or 2016.  

For the year ended December 31, 2016, Netherland, Sewell & Associates, Inc. prepared a reserves certification for the Alba 
field in E.G.  The NSAI summary report is filed as an exhibit to this Annual Report on Form 10-K.  Members of the NSAI team 
have multiple years of industry experience, having worked for large, international oil and gas companies before joining NSAI.  
NSAI’s technical team members meet or exceed the education, training, and experience requirements set forth in the Standards 
Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information promulgated by the Society of Petroleum 
Engineers. The senior technical advisor has over 14 years of practical experience in petroleum engineering and the estimation 
and evaluation of reserves and is a registered Professional Engineer in the State of Texas.  The second team member has over 12 
years of practical experience in petroleum geosciences and is a licensed Professional Geoscientist in the State of Texas.

Ryder Scott Company also performed audits of the prior years' reserves for several of our fields in 2018, 2017 and 2016.  

Their summary reports are filed as exhibits to this Annual Report on Form 10-K.  The team lead for Ryder Scott has over 36 
years of industry experience, having worked for a major financial advisory services group before joining Ryder Scott.  He is a 
25 year member of SPE and is a registered Professional Engineer in the State of Texas.

101

Supplementary Information on Oil and Gas Producing Activities (Unaudited)

Estimated Quantities of Proved Oil and Gas Reserves

The estimation of net recoverable quantities of crude oil and condensate, natural gas liquids, natural gas and our historical 
synthetic crude oil is a highly technical process which is based upon several underlying assumptions that are subject to change. 
Proved reserves are determined using "SEC Pricing", calculated as an unweighted arithmetic average of the first-day-of-the-
month closing price for each month.  See Item 1A. Risk Factors and Item 7. Management’s Discussion and Analysis of 
Financial Condition and Results of Operations – Critical Accounting Estimates for the table providing our 2018 SEC 
pricing of benchmark prices and the underlying assumptions used. 

The table below provides the 2018 SEC pricing for certain benchmark prices:

WTI Crude oil (per bbl)

Henry Hub natural gas (per mmbtu)

Brent crude oil (per bbl)

Mont Belvieu NGLs (per bbl)

2018 SEC Pricing 

$

$

$

$

65.56

3.05

72.70

26.63

102

Supplementary Information on Oil and Gas Producing Activities (Unaudited)

Estimated Quantities of Proved Oil and Gas Reserves

(mmbbl)
Crude oil and condensate
Proved developed and undeveloped reserves:

U.S.

E.G.(a)

Libya

Other 
Int'l

Cont 
Ops

Disc Ops

Total

Beginning of year - 2016

Revisions of previous estimates
Improved recovery
Purchases of reserves in place
Extensions, discoveries and
 other additions
Production
Sales of reserves in place

End of year - 2016

Revisions of previous estimates
Improved recovery
Purchases of reserves in place
Extensions, discoveries and
 other additions
Production
Sales of reserves in place

End of year - 2017

Revisions of previous estimates
Improved recovery
Purchases of reserves in place
Extensions, discoveries and
 other additions
Production
Sales of reserves in place

End of year - 2018

Proved developed reserves:
Beginning of year - 2016
End of year - 2016
End of year - 2017
End of year - 2018

Proved undeveloped reserves:
Beginning of year - 2016
End of year - 2016
End of year - 2017
End of year - 2018

201
(28)
—
—

—
(1)
—
172
—
—
—

—
(7)
—
165
—
—
—

—
(3)
(162)
—

173
172
165
—

28
—
—
—

22
3
—
—

1
(4)
—
22
8
—
—

—
(4)
—
26
3
—
—

2
(5)
(1)
25

16
13
17
22

6
9
9
3

855
31
4
12

38
(61)
(77)
802
15
—
18

34
(68)
(1)
800
55
—
—

44
(77)
(166)
656

541
468
484
345

314
334
316
311

—
—
—
—

—
—
—
—
—
—
—

—
—
—
—
—
—
—

—
—
—
—

—
—
—
—

—
—
—
—

855
31
4
12

38
(61)
(77)
802
15
—
18

34
(68)
(1)
800
55
—
—

44
(77)
(166)
656

541
468
484
345

314
334
316
311

580
55
4
12

37
(48)
(77)
563
9
—
18

30
(49)
(1)
570
49
—
—

42
(63)
(3)
595

327
238
263
287

253
325
307
308

52
1
—
—

—
(8)
—
45
(2)
—
—

4
(8)
—
39
3
—
—

—
(6)
—
36

25
45
39
36

27
—
—
—

103

 
Supplementary Information on Oil and Gas Producing Activities (Unaudited)

Estimated Quantities of Proved Oil and Gas Reserves (continued)

(mmbbl)
Natural gas liquids
Proved developed and undeveloped reserves:

U.S.

E.G.(a)

Libya

Other 
Int'l

Cont 
Ops

Disc Ops

Total

—
—
—
—

—
—
—
—
—
—
—

—
—
—
—
—
—
—

—
—
—
—

—
—
—
—

—
—
—
—

—
—
—
—

—
—
—
—
—
—
—

—
—
—
—
—
—
—

—
—
—
—

—
—
—
—

—
—
—
—

200
(8)
—
12

11
(18)
(3)
194
40
—
5

36
(20)
(1)
254
(8)
—
—

25
(24)
(1)
246

104
102
143
141

96
92
111
105

—
—
—
—

—
—
—
—
—
—
—

—
—
—
—
—
—
—

—
—
—
—

—
—
—
—

—
—
—
—

200
(8)
—
12

11
(18)
(3)
194
40
—
5

36
(20)
(1)
254
(8)
—
—

25
(24)
(1)
246

104
102
143
141

96
92
111
105

Beginning of year - 2016

Revisions of previous estimates
Improved recovery
Purchases of reserves in place
Extensions, discoveries and
 other additions
Production
Sales of reserves in place

End of year - 2016

Revisions of previous estimates
Improved recovery
Purchases of reserves in place
Extensions, discoveries and
 other additions
Production
Sales of reserves in place

End of year - 2017

Revisions of previous estimates
Improved recovery
Purchases of reserves in place
Extensions, discoveries and
 other additions
Production
Sales of reserves in place

End of year - 2018

Proved developed reserves:
Beginning of year - 2016
End of year - 2016
End of year - 2017
End of year - 2018

Proved undeveloped reserves:
Beginning of year - 2016
End of year - 2016
End of year - 2017
End of year - 2018

172
(8)
—
12

11
(14)
(3)
170
37
—
5

34
(16)
(1)
229
(9)
—
—

25
(20)
(1)
224

92
78
118
119

80
92
111
105

28
—
—
—

—
(4)
—
24
3
—
—

2
(4)
—
25
1
—
—

—
(4)
—
22

12
24
25
22

16
—
—
—

104

Supplementary Information on Oil and Gas Producing Activities (Unaudited)

Estimated Quantities of Proved Oil and Gas Reserves (continued)

(bcf)
Natural gas
Proved developed and undeveloped reserves:

U.S.

E.G.(a)

Libya

Other 
Int'l

Cont 
Ops

Disc Ops

Total

206
(1)
—
—

—
—
—
205
—
—
—

—
(1)
—
204
—
—
—

—
(1)
(203)
—

94
95
94
—

112
110
110
—

15
3
—
—

—
(8)
—
10
4
—
—

—
(6)
—
8
4
—
—

—
(5)
—
7

11
5
2
7

4
5
6
—

2,462
155
—
61

71
(278)
(25)
2,446
(47)
—
36

280
(302)
(44)
2,369
227
—
—

198
(315)
(204)
2,275

1,297
1,691
1,655
1,591

1,165
755
714
684

—
—
—
—

—
—
—
—
—
—
—

—
—
—
—
—
—
—

—
—
—
—

—
—
—
—

—
—
—
—

2,462
155
—
61

71
(278)
(25)
2,446
(47)
—
36

280
(302)
(44)
2,369
227
—
—

198
(315)
(204)
2,275

1,297
1,691
1,655
1,591

1,165
755
714
684

Beginning of year - 2016

Revisions of previous estimates
Improved recovery
Purchases of reserves in place
Extensions, discoveries and
 other additions
Production (b)
Sales of reserves in place

End of year - 2016

Revisions of previous estimates
Improved recovery
Purchases of reserves in place
Extensions, discoveries and
 other additions
Production (b)
Sales of reserves in place

End of year - 2017

Revisions of previous estimates
Improved recovery
Purchases of reserves in place
Extensions, discoveries and
 other additions
Production (b)
Sales of reserves in place

End of year - 2018

Proved developed reserves:
Beginning of year - 2016
End of year - 2016
End of year - 2017
End of year - 2018

Proved undeveloped reserves:
Beginning of year - 2016
End of year - 2016
End of year - 2017
End of year - 2018

1,151
145
—
61

71
(115)
(25)
1,288
(33)
—
36

204
(127)
(44)
1,324
188
—
—

198
(156)
(1)
1,553

640
648
726
869

511
640
598
684

1,090
8
—
—

—
(155)
—
943
(18)
—
—

76
(168)
—
833
35
—
—

—
(153)
—
715

552
943
833
715

538
—
—
—

105

Supplementary Information on Oil and Gas Producing Activities (Unaudited)

Estimated Quantities of Proved Oil and Gas Reserves (continued)

(mmbbl)
Synthetic crude oil
Proved developed and undeveloped reserves:

U.S.

Beginning of year - 2016

Revisions of previous estimates
Improved recovery
Purchases of reserves in place
Extensions, discoveries and
 other additions
Production
Sales of reserves in place

End of year - 2016

Revisions of previous estimates
Improved recovery
Purchases of reserves in place
Extensions, discoveries and
 other additions
Production
Sales of reserves in place

End of year - 2017

Revisions of previous estimates
Improved recovery
Purchases of reserves in place
Extensions, discoveries and
 other additions
Production
Sales of reserves in place

End of year - 2018

Proved developed reserves:
Beginning of year - 2016
End of year - 2016
End of year - 2017
End of year - 2018

Proved undeveloped reserves:
Beginning of year - 2016
End of year - 2016
End of year - 2017
End of year - 2018

E.G.(a)

Libya

Other 
Int'l

Cont 
Ops

Disc Ops

Total

—
—
—
—

—
—
—
—
—
—
—

—
—
—
—
—
—
—

—
—
—
—

—
—
—
—

—
—
—
—

—
—
—
—

—
—
—
—
—
—
—

—
—
—
—
—
—
—

—
—
—
—

—
—
—
—

—
—
—
—

—
—
—
—

—
—
—
—
—
—
—

—
—
—
—
—
—
—

—
—
—
—

—
—
—
—

—
—
—
—

698
12
—
—

—
(18)
—
692
—
—
—

—
(7)
(685)
—
—
—
—

—
—
—
—

698
692
—
—

—
—
—
—

698
12
—
—

—
(18)
—
692
—
—
—

—
(7)
(685)
—
—
—
—

—
—
—
—

698
692
—
—

—
—
—
—

—
—
—
—

—
—
—
—
—
—
—

—
—
—
—
—
—
—

—
—
—
—

—
—
—
—

—
—
—
—

—
—
—
—

—
—
—
—
—
—
—

—
—
—
—
—
—
—

—
—
—
—

—
—
—
—

—
—
—
—

106

Supplementary Information on Oil and Gas Producing Activities (Unaudited)

Estimated Quantities of Proved Oil and Gas Reserves (continued)

(mmboe)
Total Proved Reserves
Proved developed and undeveloped reserves:

U.S.

E.G.(a)

Libya

Other 
Int'l

Cont 
Ops

Disc Ops

Total

Beginning of year - 2016

Revisions of previous estimates
Improved recovery
Purchases of reserves in place
Extensions, discoveries and
 other additions
Production (b)
Sales of reserves in place

End of year - 2016

Revisions of previous estimates
Improved recovery
Purchases of reserves in place
Extensions, discoveries and
 other additions
Production (b)
Sales of reserves in place

End of year - 2017

Revisions of previous estimates
Improved recovery
Purchases of reserves in place
Extensions, discoveries and
 other additions
Production (b)
Sales of reserves in place

End of year - 2018

Proved developed reserves:
Beginning of year - 2016
End of year - 2016
End of year - 2017
End of year - 2018

Proved undeveloped reserves:
Beginning of year - 2016
End of year - 2016
End of year - 2017
End of year - 2018

944
73
4
34

59
(82)
(84)
948
42
—
28

98
(86)
(10)
1,020
71
—
—

100
(109)
(4)
1,078

526
424
502
552

418
524
518
526

261
2
—
—

—
(37)
—
226
(1)
—
—

18
(40)
—
203
8
—
—

—
(35)
—
176

129
226
203
176

132
—
—
—

235
(28)
—
—

—
(1)
—
206
—
—
—

—
(7)
—
199
—
—

—
(3)
(196)
—

189
188
181
—

46
18
18
—

25
4
—
—

1
(6)
—
24
8
—
—

—
(5)
—
27
5
—
—

2
(6)
(1)
27

18
14
17
24

7
10
10
3

1,465
51
4
34

60
(126)
(84)
1,404
49
—
28

116
(138)
(10)
1,449
84
—
—

102
(153)
(201)
1,281

862
852
903
752

603
552
546
529

698
12
—
—

—
(18)
—
692
—
—
—

—
(7)
(685)
—
—
—
—

—
—
—
—

698
692
—
—

—
—
—
—

2,163
63
4
34

60
(144)
(84)
2,096
49
—
28

116
(145)
(695)
1,449
84
—
—

102
(153)
(201)
1,281

1,560
1,544
903
752

603
552
546
529

(a) 

(b) 

Consists of estimated reserves from properties governed by production sharing contracts.
Excludes the resale of purchased natural gas used in reservoir management.

107

Supplementary Information on Oil and Gas Producing Activities (Unaudited)

2018 proved reserves decreased by 168 mmboe primarily due to the following:

•  Revisions of previous estimates: Increased by 84 mmboe including an increase of 108 mmboe associated with the 
acceleration of higher economic wells in the U.S. resource plays into the 5-year plan and an increase of 15 mmboe 
associated with wells to sales that were additions to the plan, partially offset by a decrease of 39 mmboe due to technical 
revisions across the business. 

•  Extensions, discoveries, and other additions: Increased by 102 mmboe primarily in the U.S. resource plays due to an 

increase of 69 mmboe associated with the expansion of proved areas and an increase of 33 mmboe associated with wells to 
sales from unproved categories. 
•  Production: Decreased by 153 mmboe.
• 

Sales of reserves in place: Decreased by 201 mmboe including 196 mmboe associated with the sale of our subsidiary in 
Libya, 4 mmboe associated with divestitures of certain conventional assets in New Mexico and Michigan, and 1 mmboe 
associated with the sale of the Sarsang block in Kurdistan.

2017 proved reserves decreased by 647 mmboe primarily due to the following:

•  Revisions of previous estimates: Increased by 49 mmboe primarily due to the acceleration of higher economic wells in the 
Bakken into the 5-year plan resulting in an increase of 44 mmboe, with the remainder being due to revisions across the 
business.

•  Extensions, discoveries, and other additions: Increased by 116 mmboe primarily due to an increase of 97 mmboe 

associated with the expansion of proved areas and wells to sales from unproved categories in Oklahoma.

•  Purchases of reserves in place: Increased by 28 mmboe from acquisitions of assets in the Northern Delaware Basin in New 

Mexico.

•  Production: Decreased by 145 mmboe.
• 

Sales of reserves in place: Decreased by 695 mmboe including 685 mmboe associated with the sale of our Canadian 
business and 10 mmboe associated with divestitures of certain conventional assets in Oklahoma and Colorado.  See Item 8. 
Financial Statements and Supplementary Data - Note 5 to the consolidated financial statements for information regarding 
these dispositions.

2016 proved reserves decreased by 67 mmboe primarily due to the following:

•  Revisions of previous estimates: Increased by 63 mmboe primarily due to an increase of 151 mmboe associated with the 
acceleration of higher economic wells in the U.S. resource plays into the 5-year plan and a decrease of 64 mmboe due to 
U.S. technical revisions. 

•  Extensions, discoveries, and other additions: Increased by 60 mmboe primarily associated with the expansion of proved 

areas and new wells to sales from unproven categories in Oklahoma. 

•  Purchases of reserves in place: Increased by 34 mmboe from acquisition of STACK assets in Oklahoma.
•  Production: Decreased by 144 mmboe.
• 

Sales of reserves in place: Decreased by 84 mmboe associated with the divestitures of certain Wyoming and Gulf of 
Mexico assets.  

Changes in Proved Undeveloped Reserves

As of December 31, 2018, 529 mmboe of proved undeveloped reserves were reported, a decrease of 17 mmboe from 

December 31, 2017.  The following table shows changes in proved undeveloped reserves for 2018:

(mmboe)
Beginning of year

Revisions of previous estimates
Extensions, discoveries, and other additions
Dispositions
Transfers to proved developed

End of year

546
47
61
(19)
(106)
529

108

Supplementary Information on Oil and Gas Producing Activities (Unaudited)

Revisions of prior estimates. Increased by 47 mmboe due to an increase of 108 mmboe associated with the acceleration of 
higher economic wells in the U.S. resource plays into the 5-year plan partially offset by a decrease of 61 mmboe due to 
technical revisions across the business.

Extensions, discoveries and other additions. Increased by 61 mmboe due to the expansion of proved areas in the U.S. resource 
plays. 

Transfers to proved developed. 106 mmboe of PUD reserves were converted to proved developed status during 2018, primarily 
from assets in our U.S. resource plays. This 2018 transfer equates to a 19% PUD conversion rate and a 5-year average annual 
PUD conversion rate during the 2014-2018 period of 18%.  All proved undeveloped reserve drilling locations are scheduled to 
be drilled prior to the end of 2023. There are no proved undeveloped reserves on the books beyond 5 years as of December 31, 
2018. 

Costs Incurred & Future Costs to Develop

 Costs incurred in 2018, 2017 and 2016 relating to the development of proved undeveloped reserves were $1,082 million, 

$842 million and $359 million.  As of December 31, 2018, future development costs estimated to be required for the 
development of proved undeveloped crude oil and condensate, NGLs and natural gas reserves for the years 2019 through 2023 
are projected to be $1,541 million, $1,595 million, $1,737 million, $1,398 million and $1,116 million. 

Capitalized Costs and Accumulated Depreciation, Depletion and Amortization

(In millions)
Year Ended December 31, 2018
Capitalized Costs:

Proved properties
Unproved properties

Total

Accumulated depreciation, depletion and
amortization:
Proved properties
Unproved properties(a)

Total

Net capitalized costs

Year Ended December 31, 2017
Capitalized Costs:

Proved properties
Unproved properties

Total

Accumulated depreciation, depletion and
amortization:
Proved properties
Unproved properties(a)

Total

Net capitalized costs

(a)       Includes unproved property impairments (see Note 11).

U.S.

E.G.

Libya

Other Int'l

Total

$

$

$

$

27,983
2,977
30,960

14,742
299
15,041
15,919

27,477
2,755
30,232

14,254
206
14,460
15,772

$

$

$

$

2,041
11
2,052

1,471
(7)
1,464
588

1,990
110
2,100

1,348
—
1,348
752

$

$

$

$

— $
—
—

—
—
—
— $

830
217
1,047

289
—
289
758

$

$

4,828
—
4,828

4,706
—
4,706
122

5,050
76
5,126

4,850
76
4,926
200

$

$

$

$

34,852
2,988
37,840

20,919
292
21,211
16,629

35,347
3,158
38,505

20,741
282
21,023
17,482

109

Supplementary Information on Oil and Gas Producing Activities (Unaudited)

Costs Incurred for Property Acquisition, Exploration and Development (a)

(In millions)
December 31, 2018

Property acquisition:

Proved

Unproved

Exploration

Development

Total

December 31, 2017

Property acquisition:

Proved

Unproved

Exploration
Development

Total

December 31, 2016

Property acquisition:

Proved

Unproved

Exploration

Development

Total

U.S.

E.G.

Libya

Other
Int'l

Cont
Ops

Disc
Ops

Total

$

11

$

222

144

921

1,204

$ 2,491

—
(9)
(126) (b)
(124)

—

1

40
(144) (b)
(103)

$

192

1,747

923

993

$ 3,855

$

$

$

$

$

$

211

144

929

1,332

$ 2,616

$

191

1,746

882
1,122

$ 3,941

$

276

642

525

456

$ 1,899

$

—

—

1

(2)

(1)

1

—

1
5

7

—

—

1

55

56

$

$

$

$

$

$

—

—

—

—

—

—

—

—
10

10

—

—

—

3

3

$

$

$

$

$

$

276

632

539

635

—
(10)
13
121 (b)
124

$ 2,082

$

$

$

$

$

$

—

—

—

—

—

—

—

—

6

6

—

—

—

31

31

$

222

144

921

1,204

$ 2,491

$

192

1,747

923

999

$ 3,861

$

276

632

539

666

$ 2,113

(a) 

(b) 

Includes costs incurred whether capitalized or expensed. 
Includes revisions to asset retirement costs primarily due to changes in U.K. estimated costs as well as timing of abandonment activities in the U.K.

110

Supplementary Information on Oil and Gas Producing Activities (Unaudited)

Results of Operations for Oil and Gas Producing Activities

Year Ended December 31, 2018
Revenues and other income:

Sales
Other income(a)

Total revenues and other income

Expenses:

Production costs
Exploration expenses(b)
Depreciation, depletion and amortization(c)
Technical support and other

Total expenses

Results before income taxes
Income tax provision
Results of operations

Year Ended December 31, 2017
Revenues and other income:

Sales
Transfers
Other income(a)

Total revenues and other income

Expenses:

Production costs
Exploration expenses(b)
Depreciation, depletion and amortization(c)
Technical support and other

Total expenses

Results before income taxes
Income tax provision
Results of operations

Year Ended December 31, 2016
Revenues and other income:

Sales
Transfers
Other income(a)

Total revenues and other income

Expenses:

U.S.

E.G.

Libya

Other
Int'l

Cont
Ops

Disc
Ops

Total

$

$ 4,842
81
4,923

$

383
—
383

196
255
451

$

402
104
506

$ 5,823
440
6,263

$ — $ 5,823
440
6,263

—
—

(1,371)
(245)
(2,247)
(49)
(3,912)
1,011
19
$ 1,030

$ 3,050
—
74
3,124

$

$

(985)
(153)
(2,105)
(28)
(3,271)
(147)
(1)
(148) $

$

(68)
(51)
(117)
(5)
(241)
142
(38)
104

45
344
—
389

(84)
—
(134)
(4)
(222)
167
(50)
117

$

$ 2,249
—
387
2,636

42
291
—
333

$

$

$

$

(12)
—
(8)
—
(20)
431
(163)
268

431
—
—
431

(44)
—
(21)
(4)
(69)
362
(333)
29

54
—
—
54

$

$

$

$

(180)
7
(102)
(6)
(281)
225
(124)
101

(1,631)
(289)
(2,474)
(60)
(4,454)
1,809
(306)
$ 1,503

— (1,631)
(289)
—
— (2,474)
(60)
—
— (4,454)
1,809
—
(306)
—
$ — $ 1,503

$

282
—
38
320

$ 3,808
344
112
4,264

423
—
(43)
380

$ 4,231
344
69
4,644

(152)
(254)
(273)
(25)
(704)
(384)
13
(371) $

(1,537)
(272)
(1,265)
(407)
(407)
—
(9,209)
(6,676)
(2,533)
(61)
(61)
—
(11,214)
(6,948)
(4,266)
(6,570)
(6,568)
(2)
(371)
1,303
1,674
(373) $ (4,894) $ (5,267)

$

237
—
2
239

$ 2,582
291
389
3,262

724
—
—
724

$ 3,306
291
389
3,986

Total expenses

Production costs
Exploration expenses(b)
Depreciation, depletion and amortization(c)
Technical support and other

(1,753)
(330)
(2,393)
(31)
(4,507)
(521)
239
(282)
Includes net gain (loss) on dispositions (see Note 5) and revisions to asset retirement costs primarily due to changes in U.K. estimated costs as well as timing 
of abandonment activities in the U.K.
Includes exploratory dry well costs, unproved property impairments, and other (see Note 11).
Includes long-lived asset impairments (see Note 11).

(1,209)
(323)
(2,154)
(30)
(3,716)
(454)
224
(230) $

(952)
(306)
(1,901)
(21)
(3,180)
(544)
195
(349) $

(544)
(7)
(239)
(1)
(791)
(67)
15
(52) $

Results before income taxes
Income tax provision(d)
Results of operations

(c) 
(d)  Discontinued operations activity includes $135 million of deferred tax expense related to Alberta provincial corporate tax rate increase.

(140)
(10)
(132)
(5)
(287)
(48)
57
9

(81)
(1)
(114)
(4)
(200)
133
(26)
107

(36)
(6)
(7)
—
(49)
5
(2)
3

(a) 

(b) 

$

$

$

$

111

Supplementary Information on Oil and Gas Producing Activities (Unaudited)

Results of Operations for Oil and Gas Producing Activities

The following reconciles results of operations for oil and gas producing activities to segment income:

Year Ended December 31,
2017

2018

2016

$

$

$

1,503
—
1,503

(5,267) $
4,894
(373)

(170)
214

(304)
103
(265)
—
1,081

$

(107)
229

(79)
475
81
—
226

$

(282)
52
(230)

(39)
142

(248)
148
72
(32)
(187)

(In millions)
Results of operations

Discontinued operations
Results of continuing operations
Items not included in results of oil and gas operations, net of tax:

Marketing income and other non-oil and gas producing related activities
Income from equity method investments

Items not allocated to segment income, net of tax:

Loss (gain) on asset dispositions and other income
Long-lived asset impairments
Unrealized loss (gain) on derivatives
Deferred tax valuation allowance increase

Segment income (loss)

112

Supplementary Information on Oil and Gas Producing Activities (Unaudited)

Standardized Measure of Discounted Future Net Cash Flows Relating to Proved Reserves

U.S. GAAP prescribes guidelines for computing the standardized measure of future net cash flows and changes therein 
relating to estimated proved reserves, giving very specific assumptions to be made such as the use of a 10% discount rate and 
an unweighted average of commodity prices in the prior 12-month period using the closing prices on the first day of each month 
as well as current costs applicable at the date of the estimate.  These and other required assumptions have not always proved 
accurate in the past, and other valid assumptions would give rise to substantially different results.  In addition, the 10% discount 
rate required to be used is not necessarily the most appropriate discount factor based on our cost of capital and the risks 
associated with our business and the oil and natural gas industry in general.  This information is not the fair value nor does it 
represent the expected present value of future cash flows of our crude oil and condensate, natural gas liquid, and natural gas 
reserves.  

(In millions)
Year Ended December 31, 2018

Future cash inflows
Future production and support costs
Future development costs
Future income tax expenses
Future net cash flows
10% annual discount for timing of cash flows

Standardized measure of discounted future net cash flows- 
related to continuing operations

Standardized measure of discounted future net cash flows- 
related to discontinued operations

Year Ended December 31, 2017

Future cash inflows
Future production and support costs
Future development costs
Future income tax expenses
Future net cash flows
10% annual discount for timing of cash flows

Standardized measure of discounted future net cash flows- 
related to continuing operations

Standardized measure of discounted future net cash flows- 
related to discontinued operations

Year Ended December 31, 2016

Future cash inflows
Future production and support costs
Future development costs
Future income tax expenses
Future net cash flows
10% annual discount for timing of cash flows

Standardized measure of discounted future net cash flows- 
related to continuing operations

Standardized measure of discounted future net cash flows- 
related to discontinued operations

$

$

$

$

$

$

$

$

$

U.S.

E.G.

Libya

Other Int'l

Total

49,054
(15,995)
(7,729)
(1,967)
23,363
(10,653)

$

$

$

$

2,218
(878)
(12)
(355)
973
(254)

— $
—
—
—
— $
—

1,813
(876)
(1,072)
275
140
100

(a)

12,710

$

719

$

— $

240

36,480
(14,796)
(6,987)
(786)
13,911
(7,009)

$

$

$

$

1,966
(748)
(7)
(274)
937
(235)

$

$

10,303
(931)
(501)
(8,387)
484
(224)

1,403
(821)
(1,247)
496
(169)
168

(a)

6,902

$

702

$

260

$

(1)

27,610
(12,758)
(7,233)
—
7,619
(4,355)

$

$

$

$

1,977
(824)
(13)
(251)
889
(264)

$

$

8,511
(930)
(296)
(6,884)
401
(143)

921
(673)
(1,345)
514
(583)
313

(a)

3,264

$

625

$

258

$

(270)

$

$

$

$

$

$

$

$

$

$

$

$

53,085
(17,749)
(8,813)
(2,047)
24,476
(10,807)

13,669

—

50,152
(17,296)
(8,742)
(8,951)
15,163
(7,300)

7,863

—

39,019
(15,185)
(8,887)
(6,621)
8,326
(4,449)

3,877

1,076

(a) 

Future cash flows for Other International reflects the impact of future abandonment costs related to the U.K.

113

Supplementary Information on Oil and Gas Producing Activities (Unaudited)

Changes in the Standardized Measure of Discounted Future Net Cash Flows

(In millions)
Sales and transfers of oil and gas produced, net of production and support costs $ (4,135)
Net changes in prices and production and support costs related to future
production

2018

Year Ended December 31,
2017
$ (2,853)

2016
$ (1,634)

6,342
998
1,240
(330)
(501)
(3,035)
1,175
4,052
5,806
7,863
$ 13,669
$ —

4,916
661
1,027
183
497
102
698
(1,245)
3,986
3,877
$ 7,863
$ —

(3,621) (b)
(2,174)
669
2,534
654
(651)
1,005
1,038
(2,180)
6,057
3,877
911

$
$

Extensions, discoveries and improved recovery, less related costs
Development costs incurred during the period
Changes in estimated future development costs
Revisions of previous quantity estimates(a)
Net changes in purchases and sales of minerals in place
Accretion of discount
Net change in income taxes
Net change for the year
Beginning of the year related to continuing operations
End of the year related to continuing operations
Net change for the year related to discontinued operations
(a) 
(b)  Decrease primarily due to lower realized prices.

Includes amounts resulting from changes in the timing of production.

114

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A. Controls and Procedures

Disclosure Controls and Procedures

An evaluation of the effectiveness of the design and operation of our disclosure controls and procedures (as defined in 
Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934) was carried out under the supervision and with the 
participation of our management, including our Chief Executive Officer and Chief Financial Officer.  As of the end of the 
period covered by this Report based upon that evaluation, the Chief Executive Officer and Chief Financial Officer concluded 
that the design and operation of these disclosure controls and procedures were effective as of December 31, 2018.

Management's Annual Report on Internal Control Over Financial Reporting

See "Management’s Report on Internal Control over Financial Reporting" under Item 8 of this Form 10-K.

Attestation Report of the Registered Public Accounting Firm

See "Report of Independent Registered Public Accounting Firm" under Item 8 of this Form 10-K.

Changes in Internal Control Over Financial Reporting

During the fourth quarter of 2018, there were no changes in our internal control over financial reporting that have 

materially affected, or were reasonably likely to materially affect, our internal control over financial reporting. 

Item 9B. Other Information

None.

115

Item 10. Directors, Executive Officers and Corporate Governance

PART III

Information required by this item is incorporated by reference to "Proposal 1: Election of Directors," "Corporate 
Governance—Committees of the Board" and "Section 16(a) Beneficial Ownership Reporting Compliance" in our Proxy 
Statement for the 2019 Annual Meeting of Stockholders, to be filed with the SEC within 120 days of December 31, 2018 (the 
"2019 Proxy Statement").

See "Executive Officers of the Registrant" under Item 1 of this Form 10-K for information about our executive officers.

  Our Code of Ethics for Senior Financial Officers, which applies to the Company’s principal executive officer, principal 
financial officer, principal accounting officer or controller, or persons performing similar functions, is available on our website 
at www.marathonoil.com under Investors—Corporate Governance.  You may request a printed copy free of charge by sending a 
request to the Corporate Secretary.  We intend to disclose any amendments and any waivers to our Code of Ethics for Senior 
Financial Officers on our website at www.marathonoil.com under Investors —Corporate Governance within four business days.  
The waiver information will remain on the website for at least 12 months after the initial disclosure of such waiver.

Item 11. Executive Compensation

Information required by this item is incorporated by reference to "Corporate Governance—Compensation Committee 
Interlocks and Insider Participation," "Compensation Committee Report," "Director Compensation," "Compensation Discussion 
and Analysis" and "Executive Compensation" in the 2019 Proxy Statement.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder 
Matters

Portions of information required by this item are incorporated by reference to "Security Ownership of Certain Beneficial 

Owners and Management" in the 2019 Proxy Statement.

Securities Authorized for Issuance Under Equity Compensation Plans

The following table provides information as of December 31, 2018 with respect to shares of Marathon Oil common stock 

that may be issued under our existing equity compensation plans:

•  Marathon Oil Corporation 2016 Incentive Compensation Plan (the "2016 Plan") 

•  Marathon Oil Corporation 2012 Incentive Compensation Plan (the "2012 Plan") – No additional awards will be granted 

under this plan.

•  Marathon Oil Corporation 2007 Incentive Compensation Plan (the "2007 Plan") – No additional awards will be granted 

under this plan.

•  Marathon Oil Corporation 2003 Incentive Compensation Plan (the "2003 Plan") – No additional awards will be granted 

under this plan.

•  Deferred Compensation Plan for Non-Employee Directors – No additional awards will be granted under this plan.

Number of 
securities to be 
issued upon
exercise of 
outstanding 
options, 
warrants and 
rights

Weighted-
average
exercise price of
outstanding 
options,
warrants and 
rights(c)

7,650,574 (a)  $
6,979 (b) 
7,657,553   

25.54

N/A

N/A

Number of 
securities
remaining 
available for 
future issuance
under equity 
compensation 
plans
32,802,084 (d) 
—   

32,802,084   

Plan category
Equity compensation plans approved by stockholders

Equity compensation plans not approved by stockholders

Total

(a) 

Includes the following:

• 

• 

1,531,500 stock options outstanding under the 2016 Plan; 2,959,103 stock options outstanding under the 2012 Plan; 1,689,404 stock options 
outstanding under the 2007 Plan;
252,600 common stock units that have been credited to non-employee directors pursuant to the non-employee director deferred compensation program 
and the annual director stock award program established under the 2016 Plan, 2012 Plan, 2007 Plan and 2003 Plan. Common stock units credited under 
the 2016 Plan, 2012 Plan, 2007 Plan and 2003 Plan were 97,297, 59,251, 78,967 and 17,085, respectively;

116

 
 
• 
• 

1,217,967 restricted stock units granted to non-officers under the 2012 Plan and 2016 Plan and outstanding as of December 31, 2018.  
In addition to the awards reported above, 1,191,709 and 6,095,270 shares of restricted stock were issued and outstanding as of December 31, 2018, but 
subject to forfeiture restrictions under the 2012 and 2016 Plans, respectively.

(b)  Reflects awards of common stock units made to non-employee directors under the Deferred Compensation Plan for Non-Employee Directors prior to 
April 30, 2003.  When a non-employee director leaves the Board, he or she will be issued actual shares of Marathon Oil common stock in place of the 
common stock units.

(c) 

The weighted-average exercise prices do not take the restricted stock units or common stock units into account as these awards have no exercise price.

(d)  Reflects the shares available for issuance under the 2016 Plan.  No more than 14,308,395 of these shares may be issued for awards other than stock 

options or stock appreciation rights.  In addition, shares related to grants that are forfeited, terminated, canceled or expire unexercised shall again 
immediately become available for issuance.

The Deferred Compensation Plan for Non-Employee Directors is our only equity compensation plan that has not been 

approved by our stockholders.  Our authority to make equity grants under this plan was terminated effective April 30, 2003.  
Under the Deferred Compensation Plan for Non-Employee Directors, all non-employee directors were required to defer half of 
their annual retainers in the form of common stock units.  On the date the retainer would have otherwise been payable to the 
non-employee director, we credited an unfunded bookkeeping account for each non-employee director with a number of 
common stock units equal to half of his or her annual retainer divided by the fair market value of our common stock on that 
date.  The ongoing value of each common stock unit equals the market price of a share of our common stock.  When the non-
employee director leaves the Board, he or she is issued actual shares of our common stock equal to the number of common 
stock units in his or her account at that time.

Item 13. Certain Relationships and Related Transactions, and Director Independence

Information required by this item is incorporated by reference to "Transactions with Related Persons," and "Proposal 1: 

Election of Directors—Director Independence" in the 2019 Proxy Statement.

Item 14. Principal Accountant Fees and Services

Information required by this item is incorporated by reference to "Proposal 2: Ratification of Independent Auditor for 

2019" in the 2019 Proxy Statement.  

117

Item 15. Exhibits, Financial Statement Schedules

A. Documents Filed as Part of the Report

PART IV

1. Financial Statements – See Part II, Item 8. of this Annual Report on Form 10-K.

2. Financial Statement Schedules – The unaudited financial statements and related footnotes of Alba Plant LLC, our equity 

method investment, are being filed within Exhibit 99.9 in accordance with Rule 3-09 of Regulation S-X.  All other 
financial statement schedules required under SEC rules but not included in this Annual Report on Form 10-K are omitted 
because they are not applicable or the required information is contained in the consolidated financial statements or notes 
thereto.

3. Exhibits – The information required by this Item 15 is incorporated by reference to the Exhibit Index accompanying this 

Annual Report on Form 10-K.

Item 16. Form 10-K Summary

None.

118

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused 

this report to be signed on its behalf by the undersigned, thereunto duly authorized.

February 21, 2019  

MARATHON OIL CORPORATION

By:    /s/ GARY E. WILSON

Gary E. Wilson

Vice President, Controller and Chief Accounting Officer

POWER OF ATTORNEY 

Each person whose signature appears below appoints Lee M. Tillman, Dane E. Whitehead, and Gary E. Wilson, and each 
of them, as his or her true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution, for him or 
her and in his or her name, place and stead, in any and all capacities, to sign any and all amendments to this Annual Report on 
Form 10-K, and to file the same, with all exhibits thereto, and other documents in connection therewith, with the Securities and 
Exchange Commission, with full power and authority to each of said attorneys-in-fact and agents to do and perform each and 
every act whatsoever that is necessary, appropriate or advisable in connection with any or all of the above-described matters 
and to all intents and purposes as he or she might or could do in person, hereby ratifying and confirming all that said attorneys-
in-fact and agents or any of them or their substitutes, may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following 
persons on February 21, 2019 on behalf of the registrant and in the capacities indicated.

Signature

/s/ LEE M. TILLMAN
Lee M. Tillman

/s/ DANE E. WHITEHEAD
Dane E. Whitehead

/s/ GARY E. WILSON
Gary E. Wilson

/s/ GREGORY H. BOYCE
Gregory H. Boyce

/s/ CHADWICK C. DEATON
Chadwick C. Deaton

/s/ MARCELA E. DONADIO
Marcela E. Donadio

/s/ DOUGLAS L. FOSHEE
Douglas L. Foshee

/s/ M.ELISE HYLAND
M. Elise Hyland

Title

Chairman, President and Chief Executive Officer

Executive Vice President and Chief Financial Officer

Vice President, Controller and Chief Accounting Officer

Director

Director

Director

Director

Director

119

 
 
 
 
 
 
 
 
 
 
 
Exhibit
Number
1
1.1

2

2.1

3
3.1

3.2

3.3
4
4.1

10
10.1

10.2

10.3

Exhibit Index

Exhibit Description

Underwriting Agreement
Bond Purchase Agreement, dated as of November 28, 2017, 
between Marathon Oil Corporation, the Parish of St. John the 
Baptist, State of Louisiana, and Morgan Stanley & Co. LLC.
Plan of Acquisition, Reorganization, Arrangement,
Liquidation or Succession
Share Purchase Agreement, dated as of March 8, 2017, by and 
among Marathon Oil Dutch Holdings B.V., as Seller, and 
10084751 Canada Limited, as a Buyer and Canadian Natural 
Resources Limited, as a Buyer, in respect of Marathon Oil 
Canada Corporation.
Articles of Incorporation and By-laws
Restated Certificate of Incorporation of Marathon Oil 
Corporation
Marathon Oil Corporation By-laws (Amended and restated as 
of February 24, 2016)

8-K

10-Q

10-K

10-K

Specimen of Common Stock Certificate
Instruments Defining the Rights of Security Holders, Including Indentures
Indenture, dated as of February 26, 2002, between Marathon 
Oil Corporation and The Bank of New York Trust Company, 
N.A., successor in interest to JPMorgan Chase Bank as 
Trustee, relating to senior debt securities of Marathon Oil 
Corporation.  Pursuant to CFR 229.601(b)(4)(iii), instruments 
with respect to long-term debt issues have been omitted where 
the amount of securities authorized under such instruments 
does not exceed 10% of the total consolidated assets of 
Marathon Oil. Marathon Oil hereby agrees to furnish a copy 
of any such instrument to the Securities and Exchange 
Commission upon its request
Material Contracts
Amended and Restated Credit Agreement, dated as of May 28, 
2014, among Marathon Oil Corporation, as borrower, The 
Royal Bank of Scotland plc, as syndication agent, Citibank, 
N.A., Morgan Stanley Senior Funding, Inc. and The Bank of 
Nova Scotia, as documentation agents, JPMorgan Chase 
Bank, N.A., as administrative agent, and certain other 
financial institutions named therein

8-K

Incorporated by Reference (File No.
001-05153, unless otherwise indicated)
Exhibit

Filing Date

Form

10-K

1.1

2/22/2018

10-Q

10.1

5/5/2017

3.1

3.2

3.3

4.2

6/1/2018

8/4/2016

2/28/2014

2/28/2014

4.1

6/2/2014

First Amendment, dated as of May 5, 2015, to the Amended 
and Restated Credit Agreement dated as of May 28, 2014, by 
and among Marathon Oil Corporation, as borrower, JPMorgan 
Chase Bank, N.A., as administrative agent, and certain other 
financial institutions named therein

Incremental Commitments Supplement, dated as of March 4, 
2016, to the Amended and Restated Credit Agreement dated 
as of May 28, 2014, as amended by the First Amendment 
dated as of May 5, 2015, among Marathon Oil Corporation, as 
borrower, the lenders party thereto, The Royal Bank of 
Scotland Plc, as syndication agent, Citibank, N.A., Morgan 
Stanley Senior Funding, Inc. and The Bank of Nova Scotia, as 
documentation agents, and JPMorgan Chase Bank, N.A., as 
administrative agent.

10-Q

10.1

5/7/2015

8-K

99.1

3/8/2016

1

 
Exhibit
Number
10.4

10.5

10.6

10.7†

10.8†

10.9†

10.10†

10.11†

10.12†

10.12†

10.12†

Incorporated by Reference (File No.
001-05153, unless otherwise indicated)
Exhibit
99.1

Filing Date
6/23/2017

Form
8-K

10-Q

10.2

8/3/2017

8-K

99.1

10/22/2018

Exhibit Description

Second Amendment, dated as of June 22, 2017, to the 
Amended and Restated Credit Agreement dated as of May 28, 
2014, as amended by the First Amendment dated as of May 5, 
2015, and supplemented by the Incremental Commitments 
Supplement dated as of March 4, 2016, among Marathon Oil 
Corporation, as borrower, the lenders party thereto, The Royal 
Bank of Scotland Plc, as syndication agent, Citibank, N.A., 
Morgan Stanley Senior Funding, Inc. and The Bank of Nova 
Scotia, as documentation agents, and JPMorgan Chase Bank, 
N.A., as administrative agent.

Incremental Commitment Supplement, dated as of July 11, 
2017, to the Amended and Restated Credit Agreement dated 
as of May 28, 2014, as amended by the First Amendment 
dated as of May 5, 2015, supplemented by the Incremental 
Commitments Supplement dated as of March 4, 2016, and 
amended by the Second Amendment dated as of June 22, 
2017, among Marathon Oil Corporation, as borrower, the 
lenders party thereto, The Royal Bank of Scotland Plc, as 
syndication agent, Citibank, N.A., Morgan Stanley Senior 
Funding, Inc. and The Bank of Nova Scotia, as documentation 
agents, and JPMorgan Chase Bank, N.A., as administrative 
agent.
Third Amendment, dated as of October 18, 2018, to the 
Amended and Restated Credit Agreement dated as of May 28, 
2014, as amended by the First Amendment dated as of May 5, 
2015 and the Second Amendment dated as of June 22, 2017 
and as supplemented by the Incremental Commitments 
Supplement dated as of March 4, 2016 and Incremental 
Commitments Supplement dated as July 11, 2017, among 
Marathon Oil Corporation, as borrower, the lenders party 
thereto, Mizuho Bank, Ltd, as syndication agent, Citibank, 
N.A., Morgan Stanley Senior Funding, Inc. and The Bank of 
Nova Scotia, as documentation agents, and JPMorgan Chase 
Bank, N.A., as administrative agent

Marathon Oil Corporation 2016 Incentive Compensation Plan 

DEF 14A

8-K/A

App. A

10.1

4/7/2016

10/6/2016

Form of Marathon Oil Corporation 2016 Incentive 
Compensation Plan Restricted Stock Award Agreement for 
Section 16 Officers (3-year cliff vesting)

Form of Marathon Oil Corporation 2016 Incentive 
Compensation Plan Restricted Stock Award Agreement for 
Section 16 Officers (3-year prorata vesting)

Form of Marathon Oil Corporation 2016 Incentive 
Compensation Plan Nonqualified Stock Option Award 
Agreement for Section 16 Officers 

Form of Marathon Oil Corporation 2016 Incentive 
Compensation Plan Restricted Stock Unit Award Agreement 
for Non-Employee Directors (3-year cliff vesting)

Form of Marathon Oil Corporation 2016 Incentive 
Compensation Plan Restricted Stock Unit Award Agreement 
for Non-Employee Canadian Directors (3-year cliff vesting)

Form of Marathon Oil Corporation 2016 Incentive 
Compensation Plan Performance Unit Award Agreement for 
Section 16 Officers

Form of Marathon Oil Corporation 2016 Incentive 
Compensation Plan Performance Unit Award Agreement for 
Officers

10-K

10.6

2/24/2017

10-K

10.7

2/24/2017

10-K

10.8

2/24/2017

10-K

10.9

2/24/2017

10-K

10.12

2/22/2018

10-K

10.13

2/22/2018

10.15†

Marathon Oil Corporation 2012 Incentive Compensation Plan

DEF 14A

App. III

3/8/2012

2

 
Exhibit
Number
10.16†

10.17†

10.18†

10.19†

10.20†

10.21†

10.22†

10.23†

10.24†

10.25†

10.26†

10.27†

10.28†

10.29†

10.30†

10.31†

10.32†

10.33†

10.34†

10.35†

10.36†

Exhibit Description

Form of Marathon Oil Corporation 2012 Incentive 
Compensation Plan Non-Qualified Stock Option Award 
Agreement

Form of Marathon Oil Corporation 2012 Incentive 
Compensation Plan Performance Unit Award Agreement for 
Section 16 Officers

Form of Marathon Oil Corporation 2012 Incentive 
Compensation Plan Performance Unit Award Agreement for 
Section 16 Officers

Form of Marathon Oil Corporation 2012 Incentive 
Compensation Plan Initial CEO Option Grant Agreement 

Form of Marathon Oil Corporation 2012 Incentive 
Compensation Plan Nonqualified Stock Option Award 
Agreement for Section 16 Officers (3-year prorata vesting)

Form of Marathon Oil Corporation 2012 Incentive 
Compensation Plan Nonqualified Stock Option Award 
Agreement for Officers (3-year prorata vesting)

Form of Marathon Oil Corporation 2012 Incentive 
Compensation Plan Restricted Stock Award Agreement for 
Section 16 Officers (3-year cliff vesting)

Form of Marathon Oil Corporation 2012 Incentive 
Compensation Plan Restricted Stock Award Agreement for 
Officers (3-year cliff vesting)

Form of Marathon Oil Corporation 2012 Incentive 
Compensation Plan Restricted Stock Award Agreement for 
Section 16 Officers (3-year prorata vesting)

Form of Marathon Oil Corporation 2012 Incentive 
Compensation Plan Restricted Stock Award Agreement for 
Officers (3-year prorata vesting)

Marathon Oil Corporation 2007 Incentive Compensation Plan

Form of Marathon Oil Corporation 2007 Incentive 
Compensation Plan Nonqualified Stock Option Award 
Agreement for Officers 

Form of Marathon Oil Corporation 2007 Incentive 
Compensation Plan Nonqualified Stock Option Award 
Agreement for Section 16 Officers 

Form of Marathon Oil Corporation 2007 Incentive 
Compensation Plan Nonqualified Stock Option Award 
Agreement  for Section 16 Officers

Marathon Oil Corporation 2003 Incentive Compensation Plan

Marathon Oil Corporation Deferred Compensation Plan for 
Non-Employee Directors (Amended and Restated as of 
December 20, 2016)

Marathon Oil Company Deferred Compensation Plan 
Amended and Restated Effective June 30, 2011

Marathon Oil Company Excess Benefit Plan Amended and 
Restated

Marathon Oil Corporation Officer Change in Control 
Severance Benefits Plan (as amended, effective January 1, 
2018)

Marathon Oil Corporation Policy for Repayment of Annual 
Cash Bonus Amounts

Marathon Oil Corporation Executive Tax, Estate, and 
Financial Planning Program, Amended and Restated, Effective 
January 1, 2009

3

Incorporated by Reference (File No.
001-05153, unless otherwise indicated)
Exhibit
10.1

Filing Date
8/1/2014

Form
8-K

10-Q

10.1

5/7/2014

10-Q

10.2

5/7/2014

10-Q

10-K

10.1

10.5

11/6/2013

2/22/2013

10-K

10.6

2/22/2013

10-K

10.7

2/22/2013

10-K

10.8

2/22/2013

10-K

10.9

2/22/2013

10-K

10.10

2/22/2013

10-K

10-K

10.5

10.6

2/29/2012

2/29/2012

10-K

10.5

2/28/2011

10-K

10.26

2/26/2010

10-K

10-K

10-K

10-K

10-K

10-K

10-K

10.9

10.29

2/26/2010

2/24/2017

10.32

2/29/2012

10.31

2/29/2012

10.33

2/22/2018

10.10

2/28/2011

10.32

2/27/2009

 
Incorporated by Reference (File No.
001-05153, unless otherwise indicated)
Exhibit
10.1

Filing Date
5/26/2011

Form
8-K

10-K

99.3

2/22/2018

10-K

99.4

2/22/2018

10-K

99.3

2/24/2017

10-K

99.2

2/22/2018

10-K

99.7

2/22/2018

Exhibit
Number
10.37

21.1*

23.1*

23.2*

23.3*

23.4*

31.1*

31.2*

32.1*

32.2*

99.1*

99.2*

99.3

99.4

99.5

99.6

99.7

Exhibit Description

Tax Sharing Agreement dated as of May 25, 2011 among 
Marathon Oil Corporation, Marathon Petroleum Corporation 
and MPC Investment LLC

List of Significant Subsidiaries

Consent of Independent Registered Public Accounting Firm

Consent of Independent Registered Public Accounting Firm

Consent of Ryder Scott Company, L.P., independent 
petroleum engineers and geologists

Consent of Netherland, Sewell & Associates, Inc., 
independent petroleum engineers and geologists

Certification of President and Chief Executive Officer 
pursuant to Rule 13(a)-14 and 15(d)-14 under the Securities 
Exchange Act of 1934

Certification of Chief Financial Officer pursuant to Rule 
13(a)-14 and 15(d)-14 under the Securities Exchange Act of 
1934

Certification of President and Chief Executive Officer 
pursuant to 18 U.S.C. Section 1350

Certification of Chief Financial Officer pursuant to 18 U.S.C. 
Section 1350

Summary report of audits performed by Ryder Scott 
Company, L.P., independent petroleum engineers and 
geologists for 2017

Summary report of audits performed by Ryder Scott 
Company, L.P., independent petroleum engineers and 
geologists for 2017

Summary report of audits performed by Ryder Scott 
Company, L.P., independent petroleum engineers and 
geologists for 2016

Summary report of audits performed by Ryder Scott 
Company, L.P., independent petroleum engineers and 
geologists for 2016

Summary report of audits performed by Ryder Scott 
Company, L.P., independent petroleum engineers and 
geologists for 2016

Summary report of audits performed by Ryder Scott 
Company, L.P., independent petroleum engineers and 
geologists for 2016

Summary report performed by Netherland, Sewell & 
Associates, Inc., independent petroleum engineers and 
geologists for 2016

99.9*

101.INS*

Alba Plant, LLC financial statements as of December 31, 
2018
XBRL Instance Document

101.SCH*

XBRL Taxonomy Extension Schema

101.CAL*

XBRL Taxonomy Extension Calculation Linkbase

101.PRE*

XBRL Taxonomy Extension Presentation Linkbase

101.LAB*

XBRL Taxonomy Extension Label Linkbase

101.DEF*

XBRL Taxonomy Extension Definition Linkbase

*

†

Filed herewith.

Management contract or compensatory plan or arrangement.

4

 
 
 
 
Corporate Information

Corporate Headquarters
5555 San Felipe Street
Houston, TX 77056-2723

Marathon Oil Corporation Web Site
www.marathonoil.com

Investor Relations Office
5555 San Felipe Street 
Houston, TX 77056-2723 

Guy Baber, VP Investor Relations
+1 713-296-1892

Notice of Annual Meeting
The 2019 Annual Meeting of Stockholders will be held in 
Houston, Texas, on May 29, 2019.

Independent Accountants
PricewaterhouseCoopers LLP
1000 Louisiana Street, Suite 5800
Houston, TX 77002-5021 

Stock Exchange Listing
New York Stock Exchange 

Common Stock Symbol
MRO

Stock Transfer Agent
Computershare
211 Quality Circle, Suite 210
College Station, TX 77845
888-843-5542 (Toll free - U.S., Canada, Puerto Rico)
+1 781-575-4735 (non-U.S.)
web.queries@computershare.com

Stockholder Return Performance Graph
The line graph below compares the yearly change in cumulative 
total stockholder return for our common stock with the cumulative 
total return of the Standard & Poor’s 500 Stock Index (“S&P 
500”) and the Peer Group Index shown in our 2018 Annual Report 
(the “2018 Peer Group”). We use a Peer Group Index because 
there is no relevant published industry or line-of-business index 
that reflects the companies against which we compete as an 
independent exploration and production company. The 2018 Peer 
Group Index is comprised of Anadarko Petroleum Corporation, 
Apache Corporation, Chesapeake Energy Corporation, Continental 
Resources, Inc., Devon Energy Corporation, Encana Corporation, 
EOG Resources, Inc., Hess Corporation, Murphy Oil Corporation, 
Noble Energy, Inc., and Pioneer Natural Resources Company.

Comparison of Cumulative Total Return on $100 
Invested in Marathon Oil Common Stock on December 31, 2013 
 vs.  
*S&P 500 and Peer Group Index 

*Total return assumes reinvestment of dividends

 
Company Information

Board of Directors

Executive Officers

Gregory H. Boyce
Independent Lead Director
Former Executive Chairman, Peabody Energy Corporation

Chadwick C. Deaton
Former Executive Chairman, Baker Hughes Incorporated

Marcela E. Donadio
Former Partner, Ernst & Young, LLP

Jason B. Few
President and Director, Sustayn, L.L.C.

Douglas L. Foshee
Founder and Owner, Sallyport Investments, LLC
Former Chairman, President and CEO, El Paso Corporation

M. Elise Hyland
Former Senior Vice President, EQT Corporation

J. Kent Wells
Former CEO and President, Fidelity Exploration & Production 
Company 

Lee M. Tillman
Chairman, President and CEO, Marathon Oil Corporation

Lee M. Tillman
Chairman, President and Chief Executive Officer

Dane E. Whitehead
Executive Vice President and Chief Financial Officer

T. Mitchell Little
Executive Vice President, Operations

Patrick J. Wagner
Executive Vice President, Corporate Development and Strategy

Reginald D. Hedgebeth
Senior Vice President, General Counsel and Secretary

Gary E. Wilson
Vice President, Controller and Chief Accounting Officer

Forward-Looking Statements and Other Items

This annual report contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and 
Section 21E of the Securities Exchange Act of 1934. These are statements, other than statements of historical fact, that give current 
expectations or forecasts of future events, including without limitation: the Company’s 2019 capital program and the allocation 
thereof, returns, organic free cash flow, 2019 balance sheet, margins and asset quality.  

While the Company believes that its assumptions concerning future events are reasonable, we can give no assurance that these 
expectations will prove to be correct. A number of factors could cause results to differ materially from those indicated by such 
forward-looking statements including, but not limited to:  conditions in the oil and gas industry, including supply/demand levels 
for crude oil and condensate, NGLs, natural gas and synthetic crude oil and the resulting impact on price; changes in expected 
reserve or production levels; changes in political or economic conditions in the jurisdictions in which we operate, including 
changes in foreign currency exchange rates, interest rates, inflation rates, and global and domestic market conditions; risks 
relating to our hedging activities; capital available for exploration and development; drilling and operating risks; well production 
timing; availability of drilling rigs, materials and labor, including the costs associated therewith; difficulty in obtaining necessary 
approvals and permits; non-performance by third parties of their contractual obligations; unforeseen hazards such as weather 
conditions, acts of war or terrorist acts and the governmental or military response thereto; cyber-attacks; changes in safety, health, 
environmental, tax and other regulations; other geological, operating and economic considerations; and the risk factors, forward-
looking statements and challenges and uncertainties described in the Company’s 2018 Annual Report on Form 10-K, Quarterly 
Reports on Form 10-Q and other public filings and press releases available at www.marathonoil.com. Except as required by law, 
the Company assumes no duty to revise or update any forward-looking statements whether as a result of new information, future 
events or otherwise.

The letter in this annual report includes non-GAAP financial measures, including organic free cash flow. Reconciliations of the 
differences between non-GAAP financial measures used in the letter and their most directly comparable GAAP financial measures 
are available at www.marathonoil.com in the 4Q18 Investor Packet.