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, 20152017
Commission file number 1-5153
Marathon Oil Corporation
(Exact name of registrant as specified in its charter)
Delaware 25-0996816
(State or other jurisdiction of incorporation or organization) (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 Name of each exchange on which registered
Common Stock, par value $1.00 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 RþNo £o
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  £o No  Rþ
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 Rþ No £o
Indicate by check mark whether the registrant has submitted electronically and posted on its corporate web site, if any, every Interactive Data File required to be submitted and posted 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 and post such files).  Yes Rþ No £o
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.  £þ

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company, or an emerging growth company. See definitionthe definitions of "large accelerated filer," "accelerated filer", "smaller reporting company," and "smaller reporting"emerging growth company" in Rule 12b-2 of the Exchange Act.
Large accelerated filerþ
Accelerated filer o
Non-accelerated filer o
(Do not check if a smaller reporting company)
Smaller reporting company o
Emerging growth company o
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. Ro    Accelerated filer  £ Non-accelerated filer  £ Smaller reporting company  £
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).  Yes  £oNo   Rþ
The aggregate market value of Common Stock held by non-affiliates as of June 30, 2015: $17,9162017: $10,050 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 676,886,641849,755,866 shares of Marathon Oil Corporation Common Stock outstanding as of February 15, 2016.14, 2018.
Documents Incorporated By Reference:
Portions of the registrant’s proxy statement relating to its 20162018 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-ownedwholly 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
Table of Contents
 


 
 
    
 
    
 
    
 
    
 
    
 
   
 
    
 
    
 
    
 
    
 
    
 
    
 
    
 
   
 
    
 
    
 
    
 
    
 
   
 
    
  



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 holdheld 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 Development Program – 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.
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.
Downstream business – The refining, marketing and transportation ("RM&T") operations, spun-off on June 30, 2011 and treated as discontinued operations.
Dry well – A well found to be incapable of producing either oil or natural gas in sufficient quantities to justify completion.
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.
EIA – United States Energy Information Agency.
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.
FPSO - Floating production, storage and offloading vessel.
Henry Hub price - a natural gas benchmark price quoted at settlement date average.
IRS – United States Internal Revenue Service.
LNG – Liquefied natural gas.
LPG – Liquefied petroleum gas.
Liquid hydrocarbons or liquids – Collectively, crude oil, synthetic 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 and its consolidated subsidiaries: the company as it exists following the June 30, 2011 spin-off of the downstream business.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.
mmboe – Million barrels of oil equivalent.
mmbtu – Million British thermal units.

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mmcfd – Million stabilized cubic feet per day.
mmta – Million metric tonnes per annum.

MPC - Marathon Petroleum Corporation Thethe separate independent company, which now owns and operates the downstream business.refining, marketing and transportation operations.
mt – metric tonnes
mtd Thousand 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, thatwhich 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 and through installed extraction equipment and infrastructure operational at the time of the reserves estimate if the extraction is by means not involving a 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 or through installed extraction equipment and infrastructure operational atrecompletion. 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 time of the reserves estimate if the extraction is by means not involvingspecific circumstances justify a well.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 producibilityviability at greater distances.
PSC – Production sharing contract.
Quest CCS – Quest Carbon Capture and Storage project at the AOSP in Alberta, Canada.
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.
SAGE – United Kingdom Scottish Area Gas Evacuation system composed of a pipeline and processing terminal.
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).

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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 generally accepted in the U.S.
WCS – Western Canadian Select, an oil index benchmark price with monthly pricing based upon average WTI adjusted for differentials unique to western Canada.
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 interestinterests or other interests.
WTI – West Texas Intermediate crude oil, an oil index benchmark price as quoted by NYMEX.


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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, workforce reductions and expected savings, cost reductions, non-core asset sales, and financial flexibility; our ability to successfully effect those strategies and the expected timing and results thereof; our 2016 Capital Program2018 capital development program 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 ability and strategies to manage through the lower commodity price cycle; 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, we can give no assurance that these expectations willmay 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 pricingsupply and supply/demand levels for crude oil and condensate, NGLs and natural gas and synthetic crude oil;the resulting impact on price;
changes in expected reserve or production levels;
changes in political or economic conditions in key operating markets,the jurisdictions in which we operate, including international markets;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;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 assume no duty to revise or update any forward-looking statements whether 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.




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PART I
Item 1. Business
General
Marathon Oil Corporation (NYSE: MRO) is an independent global exploration and production company based in Houston, Texas, focused on U.S. unconventional resource plays with operations in North America,the United States, Europe and Africa. Our corporate headquarters areis located at 5555 San Felipe Street, Houston, Texas 77056-2723 and our telephone number is (713) 629-6600. Each of our threetwo reportable operating segments isare organized and managed based upon both geographic location and the nature of the products and services it offers.offered. The two segments are:
North AmericaUnited States E&P – explores for, produces and markets crude oil and condensate, NGLs and natural gas in North America;the United States;
International E&P – explores for, produces and markets crude oil and condensate, NGLs and natural gas outside of North Americathe United States and produces and markets products manufactured from natural gas, such as LNG and methanol, in E.G.; and
Oil Sands Mining – mines, extracts and transports bitumen from oil sands deposits in Alberta, Canada, and upgrades the bitumen to produce and market synthetic crude oil and vacuum gas oil.
We were incorporated in 2001. On June 30, 2011, we completed the spin-off of our downstream business, creating two independent energy companies: Marathon Oil and MPC.
Strategy and Results Summary

Marathon Oil’sOur strategy is to safely and sustainably deliver valuecompetitive returns by investing in low cost, liquids-rich projects with a focus on risk-adjusted rates of return. We are focused in the high quality core of three premier unconventional resource plays in the U.S.: the Eagle Ford, Bakken and Oklahoma Resource Basins. Our strategy for our operated conventional producing assets in E.G., the U.K. and the U.S. is to maximize value and cash flow to provide flexibility to invest in the shorter cycle opportunities in the U.S. resource plays. Our conventional exploration program is currently limited to existing commitments in the Gulf of Mexico and Gabon. Our strategy is guided by the following seven strategic imperatives ("SI7"):
1.Living Our Values
2.Investing in Our People
3.Continuous Improvement in Operational and Capital Efficiency
4.Driving Profitable and Sustainable Growth
5.Rigorous Portfolio Management
6.Quality and Material Resource Capture
7.Delivering Long-Term Shareholder Value
Commodity prices are the most significant factor impacting our revenues, profitability, operating cash flows and the amount of capital available to reinvest into our business. The low pricing environment has presented several challenges for us and our industry. We responded to the lower commodity prices in a number of ways:
Reduced our 2015 Capital Program by approximately 50% from the prior year, down to $3 billion
Established our 2016 Capital Program at $1.4 billion
Exercised cost discipline, significantly reducing drilling and completion, production and general and administrative costs
Drove sustainable operational efficiency gains in the U.S. unconventional resource plays
Scaled back our conventional exploration program to focus on our U.S. unconventional resources plays
Increased our target for non-core asset sales, now $750 million to $1 billion, up from our previous goal of $500 million
Closed over $300 million of non-core asset sales (excluding closing adjustments)
Protected our liquidity and capital structure:
Issued $2 billion aggregate principal amount of unsecured senior notes ($1 billion of which was used to repay the 0.90% senior notes that matured in November 2015)
Increased the capacity of the revolving credit facility from $2.5 billion to $3.0 billion while also extending the maturity date an additional year to May 2020
Decreased our quarterly dividend from $0.21 to $0.05 per share, saving approximately $425 million of cash on an annualized basis

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In 2015, we continued to focusfocusing on the U.S. unconventional resource plays. We progressed co-development in the Eagle Ford, further delineated Austin Chalk in the Eagle Ford along with SCOOP/STACK in the Oklahoma Resource Basins and improved overall competitiveness in the Bakken withlowest cost, reductions and enhanced completions. Our U.S. operations added 73 mmboe proved reserves in 2015, excluding acquisitions, dispositions and production, amounting to an increase of 107% over the prior year's ending balance.
Net sales volumes from continuing operations increased by 6% to 438 mboed in 2015 from 415 mboed in 2014. Volumes from our threehighest margin U.S. resource plays totaled 218 mboed, an increase of 20% from 181 mboed in 2014. For the total company, we ended 2015 with proved reserves of approximately 2,163 mmboe as compared to 2,198 mmboe at the end of 2014.
while maintaining a peer-leading balance sheet. See Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations, - Outlook, for a more detailed discussion of our operating results, cash flows and outlook, including the 2016 Capital Program.liquidity.
We are concentrated on our core operations in our U.S. unconventional resource plays and E.G. The map below shows the locations of our worldwide operations.core operations:
* Our additional locations include the Gulf of Mexico, U.K., Libya, Gabon and the Kurdistan Region of Iraq.
Segment and Geographic Information
In the second quarter of 2017, we closed on the sale of our Canadian business which includes our Oil Sands Mining segment and exploration stage in-situ leases. The Canadian business is reflected as discontinued operations in all periods presented. Additionally, we have renamed our North America E&P segment to United States E&P segment, effective June 30, 2017. See Item 8. Financial Statements and Supplementary Data – Note 1 to the consolidated financial statements for further detail. For reportable operating segment and geographic financial information, see Item 8. Financial Statements and Supplementary Data – Note 76 to the consolidated financial statements.
In the following discussion regarding our North AmericaUnited States E&P and International E&P and Oil Sands Mining segments, references to net wells, acres, sales or investment indicate our ownership interest or share, as the context requires.
North America
United States E&P Segment
We are engaged in oil and gas exploration, development and/orand production activities in the U.S. and Canada. Our primary focus in the North AmericaUnited States E&P segment is concentrated within our four high quality unconventional resource plays. The following tables provide additionalSee Item 7.  Management’s Discussion and Analysis of Financial Condition and Results of Operations for further detail regarding net sales volumes, sales mix and operated drilling activity:on current year results.


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Net Sales Volumes2015 Increase
(Decrease)
 2014 Increase
(Decrease)
 2013
Equivalent Barrels (mboed)
         
  Eagle Ford134
 20 % 112
 38 % 81
  Oklahoma Resource Basins25
 39 % 18
 29 % 14
  Bakken59
 16 % 51
 31 % 39
  Other North America (a)
51
 (11)% 57
 (15)% 67
    Total North America E&P (mboed)
269
 13 % 238
 18 % 201
(a)     Includes Gulf of Mexico and other conventional onshore U.S. production
Sales Mix - U.S. Resource Plays - 2015Eagle Ford Oklahoma Resource Basins Bakken
Crude oil and condensate60% 19% 87%
Natural gas liquids19% 28% 7%
Natural gas21% 53% 6%
Drilling Activity - U.S. Resource Plays2015 2014 2013
Gross Operated     
  Eagle Ford:     
    Wells drilled to total depth251
 360
 299
    Wells brought to sales276
 310
 307
  Oklahoma Resource Basins:     
    Wells drilled to total depth20
 19
 10
    Wells brought to sales21
 18
 9
  Bakken:     
    Wells drilled to total depth35
 83
 76
    Wells brought to sales56
 69
 77
United States E&P-- Unconventional Resource Plays
Eagle Ford- As of December 31, 2015, we had approximately 153,000 net acres in the Eagle Ford in south Texas and 1,236 gross (911 net) operated producing wells, where we – We have been operating since 2011.
Of the 276 gross wells brought to sales in 2015, 56 were in the Austin Chalk, 28 were in the UpperSouth Texas Eagle Ford and 192 were in the Lower Eagle Ford. Of the 310 gross wells brought to sales in 2014, 22 were in the Austin Chalk and four were in the Upper Eagle Ford. Our 2015 average spud-to-TD time was 11 days compared to 13 days in 2014. Our high-density pad drilling continues to average approximately four wells per pad in 2015. The continued focus on stimulation design has contributed to incremental improvements in well performance across our areaplay since 2011, where roughly two thirds of activity.
During 2015, we continued evaluation of the Austin Chalk formation and began delineation of Upper Eagle Ford across our acreage positionis located in south Texas, with a total of 22,000 Austin Chalk acresKarnes County and 16,500 Upper Eagle Ford acres now delineated. The mix of crude oil and condensate, NGLs and natural gas from the Austin Chalk wells is similar to Eagle Ford condensate wells. Co-development of the Austin Chalk, Upper and Lower Eagle Ford horizons will leverage the infrastructure investments we have made to support production growth across the Eagle Ford operating area.
Atascosa County. We operate approximately 800 miles of gathering pipeline in the Eagle Ford area. We now have 32 central gathering and treating facilities with aggregate capacity ofacross the field that support more than 475 mboed.1,500 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, Atascosa and Bee Counties of south Texas.Counties.
In late 2015, we connected to a newly constructed third-party liquids pipeline, which allowed us to increase the amountBakken – We have been operating in North Dakota and eastern Montana since 2006. The majority of our Eagle Ford production transported by pipeline to 90% at year-end, upacreage is in core prospects within McKenzie, Mountrail, and Dunn Counties in North Dakota. We continue focusing on the high-return Myrmidon area building on the successes from an average of 70% during 2014. The ability to transport more barrels by pipeline enables us to improve/optimize price realizations, reduce costs, improve reliability and lessen our environmental footprint.
Approximately 42% ofenhanced completion designs, as well as delineating our 2016 Capital Program, $600 million, is allocated to the Eagle Ford. We expect drilling activity to average five rigsposition in 2016. Our drilling plans for 2016 include drilling 91 - 96 net wells (150 - 160 gross, of which we will operate 134 - 141). We anticipate bringing 124 - 132 gross operated wells to sales during 2016.Hector.
Oklahoma Resource Basins– Our primary focus in 2016 will beOklahoma has been delineation and leasehold protection in the Meramec play in the STACK and delineation of the Woodford and Springer plays in the SCOOP, and STACK areas.  In the SCOOP and STACK areasas we move toward infill development. We hold approximately 265,000 net acresacreage with rights to the Woodford, Springer, Meramec, Osage, Oswego, Granite Wash and

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other Pennsylvanian and Mississippian plays.  This includes 8,000 net acres addedplays, with a majority of this in the Oklahoma Resource Basins, primarily in the STACK Meramec play during 2015.
Approximately 90% of our SCOOP acreage is held by production. In the SCOOP Woodford, we delineated over 70% of our acreage. We estimate the SCOOP Springer has a high oil yield that is about 85% liquids. We believe about 80% of our acreage in STACK has the potential for co-development of multiple horizons. About 67,000 STACK Woodford acres are delineated while approximately 42,000 acres of STACK Meramec acreage is delineated.  
Approximately 14% of our 2016 Capital Program, $204 million, is allocated to the Oklahoma Resource Basins, which will support two rigs and lease retention in the STACK and delineation of the SCOOP Springer and Meramec.  Our drilling plans for the Oklahoma Resource Basins in 2016 call for drilling and completing 23 - 28 net wells (65 - 75 gross, of which 24 - 27 are company operated wells).  We anticipate bringing 20 - 22 gross operated wells to sales during 2016.STACK.
BakkenNorthern Delaware – We hold approximately 277,000 net acresclosed on multiple Permian acquisitions during 2017, with a majority of the acreage in Northern Delaware. These acquisitions give us a strong foundational footprint in the Bakken shale oil play in North Dakota and eastern Montana,region where we have been operating since 2006. We continuebegun developing the Wolfcamp and Bone Spring plays. See Item 8. Financial Statements and Supplementary Data – Note 5 to see improvement in efficiency and well performance through optimizing completion techniques. We successfully completed a 55-well enhanced completion trial program that began in late 2014 and continued through 2015. We will continue executing and evaluating enhanced completion designs, including increased stage counts, high proppant volumes and fluid types as opportunities arise in 2016. Our large scale water gathering system is currently handling over 50% of our produced water. With a second phase expected to be fully operational in the second half of 2016, we anticipate this system will manage 80% of produced water by year end.consolidated financial statements for further detail.
Other United States
Our time to drill a well averaged 15 days spud-to-TD in 2015 compared to 17 days in 2014. We recompleted 11 wells during 2015. In efforts to optimize price realizations, we sell our production in local North Dakota markets and to select purchasers who may elect to transport outside the state.
Approximately 13% of our 2016 Capital Program, $193 million, is allocated to the Bakken, which will support one rig in 2016. Our 2016 Bakken program includes plans to drill 10 - 12 net wells (45 - 55 gross, of which we will operate 8 - 10). We anticipate bringing 13 - 15 gross operated wells to sales during 2016.
Other North America
During 2015, we further emphasized our focus on the U.S. unconventional resource plays, continued to maximize cash generation from our conventional assets and continued to dispose of non-core assets. In August 2015, we closed the sale of our East Texas, North Louisiana and Wilburton, Oklahoma natural gas assets. In December 2015, we closed the sale of our operated producingremaining properties in the greater Ewing Bank area and non-operated producing interests in the Petronius fieldUnited States primarily consist of outside operated assets in the Gulf of Mexico. In February 2016, we closed the sale of our non-operated producing interests in the Neptune field in the Gulf of Mexico. These assets collectively produced approximately 14 mboed in 2015.
Other North America consists primarily of onshore production operations in Wyoming and development activities in the Gulf of Mexico. In the Gulf, development work continues inMexico, including the Gunflint field located on Mississippi Canyon Blocks 948, 949, 992 (N/2) and 993 (N/2). The development wells were completed in 2015. First oil is expected in mid-2016 after the completion of work at the third-party Gulfstar 1 host facility. Wewhere we hold an 18% non-operated working interest in the Gunflint field.
A deepwater oil discovery on the Shenandoah prospect, located on Walker Ridge Block 51, was drilled in 2009. We own a 10% non-operated working interest in this prospect. The first appraisal well on the Shenandoah prospect reached total depth in 2013 and was successful. The operator drilled a second appraisal well in 2014, which was unsuccessful. A third appraisal well was spud in 2015, and was successfully sidetracked, logged and cored, finding more than 620 feet of net oil pay. A fourth appraisal well is expected to be spud in the first quarter of 2016.
Wyoming - We have ongoing waterflood and enhanced oil recovery projects in the mature Big Horn and Wind River Basins.  Marathon is the third largest oil producer in the state of Wyoming.  We also have conventional natural gas operations in the Greater Green River Basin.
Our Wyoming net sales averaged 17 mbbld of liquid hydrocarbons and 4 mmcfd of natural gas, or 17 mboed, during 2015 compared to 18 mboed in 2014. In addition, Marathon owns the 420-mile Red Butte Pipeline which connects oil fields in the Big Horn Basin to both the Silvertip Station on the Montana/Wyoming state line and to alternate outlets in Casper, Wyoming.  

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North America E&P--Exploration
In September 2015, we announced our intention to scale back our conventional exploration program. Our 2016 Capital Program includes $15 million for conventional exploration. No conventional exploration wells are planned in 2016. Our Capital Program is limited to existing commitments in the Gulf of Mexico. We continue to evaluate options for utilization of our remaining commitments on the Maersk Valiant drillship.  The rig is currently being operated by our rig share partner, and we anticipate the rig to be available for our use in early 2017.     
The Solomon exploration prospect located on Walker Ridge Block 225 was spud during the second quarter of 2015 and reached total depth in the fourth quarter. The well did encounter the lower tertiary target interval. The well was plugged and abandoned, with well costs charged to dry well expense, and the rig was released with no further activity planned on the block. We hold a 58% operated working interest in this prospect.
We hold interests in both operated and non-operated exploration stage oil sand leases in Alberta, Canada, which could be developed using in-situ methods of extraction. These leases cover approximately 142,000 gross (54,000 net) acres in four project areas: Namur, in which we hold a 70% operated interest; Birchwood, in which we hold a 100% operated interest; Ells River, in which we hold a 20% non-operated interest; and Saleski in which we hold a 33% non-operated interest. During 2015, in connection with our decision to scale back our conventional exploration program, and also after further evaluation of the estimated recoverable resources and our development plans at Birchwood, Ells River and Namur, we impaired the remaining net book values of these in-situ properties.
International E&P Segment
We are engaged in oil and gas exploration, development and/orand production activitiesacross our international locations primarily in E.G., Gabon, the Kurdistan Region of Iraq, LibyaU.K. and the U.K.Libya. We include the results of our naturalLPG processing plant, gas liquefaction operations and methanol production operations in E.G. in our International E&P segment. The following table provides net sales volumes for our significant operational areas within this segment:
Net Sales Volumes2015 Increase
(Decrease)
 2014 Increase
(Decrease)
 2013
Equivalent Barrels (mboed)
         
  Equatorial Guinea97
 (7)% 104
 (3)% 107
  United Kingdom (a)
19
 19 % 16
 (20)% 20
  Libya
 (100)% 7
 (75)% 28
    Total International E&P (mboed)
116
 (9)% 127
 (18)% 155
Net Sales Volumes of Equity Method Investees         
  LNG (mtd)
5,884
 (10)% 6,535
  % 6,548
  Methanol (mtd)
937
 (14)% 1,092
 (13)% 1,249
(a) Includes natural gas acquired for injection and subsequent resale of 8 mmcfd, 6 mmcfd and 7 mmcfd for 2015, 2014, and 2013.
AfricaInternational E&P
Equatorial GuineaProduction – We own a 63% operated working interest under a PSCproduction sharing contract in the Alba field and an 80% operated working interest in Block D, both of which isare offshore E.G. Block D was unitized with the Alba field in second quarter 2017. Operational availability from our company-operated facilities averaged approximately 97%99% in 2015. In the third quarter of 2015, production was increased as the Alba C21 development well came online with higher than expected liquid yields, in combination with a successful well intervention program on five existing Alba wells. In January 2016, we completed the installation of an offshore compression platform which is expected to start up mid-2016 following completion of hookup and commissioning activities. The compression project was designed to maintain the production plateau two additional years and extend field life up to eight years.2017.
Equatorial GuineaGas Processing – We own a 52% interest in Alba Plant LLC, accounted for as an equity method investee, thatinvestment, which operates an onshore LPG processing plant located on Bioko Island. Alba field natural gas, is processed by the LPG plant. Underunder 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 of which are accounted for as equity method investments. EGHoldings operates ana 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 reservesproduction from the Alba field.
EGHoldings' 3.7 mmta The LNG production facility sells LNG under a 3.4 mmta or 460 mmcfd, sales and purchase agreement through 2023. The purchaser underagreement. 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 totaled 3.6approximately 3.95 mmta in 2015.

9


2017. AMPCO had gross sales totaling 760approximately 1,100 mt in 2015. Production from the plant2017. Methanol production is usedsold to supply customers in Europe and the U.S.
United Kingdom – Our operated asset in the U.K. sector of the North Sea is 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 – We hold a 16% non-operated working interest in the Waha concessions, which encompass almost 13 million gross acresincludes acreage located in the Sirte Basin of eastern Libya, whereLibya. While civil and political unrest continues to interrupthas interrupted operations in recent years, our production operations. Operations were interruptedresumed in mid-2013 as a result of the shutdown ofOctober 2016 at our Waha concession. During December 2016, liftings resumed from the Es Sider crude oil terminal,terminal. During 2017 sales volumes and although temporarily re-opened during the second half of 2014, production remains shut-in through early 2016. Considerable uncertainty remains around the timing of future production and sales levels. We and our partnerscontinued, except for a brief interruption in the Waha concessions continueMarch 2017 due to assess the situation and the condition of our assets in Libya.  See Item 8. Financial Statements and Supplementary Data – Note 12 to the consolidated financial statements for additional information about our Libya operations.civil unrest.
Other International
United Kingdom – Our largest asset in the U.K. sector of the North Sea is the Brae area complex where we are the operator and have a 42% working interest in the South, Central, North and West Brae fields and a 39% working interest in the East Brae field. The Brae Alpha platform and facilities host the South, Central and West Brae fields. The North Brae and East Brae fields are natural gas condensate fields which are produced via the Brae Bravo and the East Brae platforms, respectively. The East Brae platform also hosts the nearby Braemar field in which we have a 28% working interest. During the second quarter of 2015, we completed the final three wells of a five-well Brae infill drilling program that began in 2014.
The strategic location of the Brae platforms, along with pipeline and onshore infrastructure, has generated third-party processing and transportation business since 1986. Currently, the operators of 31 third-party fields are contracted to use the Brae system and 72 mboed are being processed or transported through the Brae infrastructure. In addition to generating processing and pipeline tariff revenue, this third-party business optimizes infrastructure usage.
The working interest owners of the Brae area producing assets collectively own a 50% non-operated interest in the SAGE system. The SAGE pipeline transports natural gas from the Brae area, and the third-party Beryl area, and has a total wet natural gas capacity of 1.1 bcf per day. The SAGE terminal at St. Fergus in northeast Scotland processes natural gas from the SAGE pipeline as well as approximately 0.3 bcf per day of third-party natural gas.
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. The export of Foinaven liquid hydrocarbons is via shuttle tanker from an FPSO to market. All natural gas sales are to the non-operated Magnus platform for use as injection gas.
Kurdistan Region of IraqWe have non-operated interests in two blocks located north-northwest of Erbil: Atrush with a 15% working interest and Sarsang with a 20% working interest. In aggregate,2016, we have approximately 109,000 net acres inrelinquished to the Kurdistan Region of Iraq. We have aRegional Government our 45% operated working interest in the Harir block located northeast of Erbil. We also have non-operated interests in two blocks located north-northwest of Erbil: Atrush with 15% working interest and Sarsang with 20% working interest.
On the non-operated Atrush block, following the successful appraisal program and a declaration of commerciality, the Kurdistan Ministry of Natural Resources approved a plan for field development in September 2013.  The development project consists of drilling four production wells and constructing a central processing facility in Phase 1 which provides for a 25-year production period. We expect first production in late 2016 with estimated initial gross production of approximately 30 mbbld of oil. Subject to further drilling and testing results, and partner and government approvals, a potential Phase 2 development could add an additional gross 30 mbbld facility.
On the non-operated Sarsang block, the Swara Tika discovery was declared commercial in May 2014 and a field development plan was filed in June 2014. The plan was approved by the Kurdistan Ministry of Natural Resources in the fourth quarter of 2015. The first producing well came online in 2014 and the second producing well came online in December 2015. In 2016, an additional well is planned to come on-line. As the development plan progresses, we expect to increase production after 2016.
International E&P Exploration
In September 2015, we announced our intention to scale back our conventional exploration program. Our 2016 Capital Program includes $16 million for conventional exploration. No conventional exploration wells are planned in 2016. Our Capital Program is limited to existing commitments in Gabon.
Equatorial GuineaGabonExploration – We hold a 63% operated working interest in the Deep Luba discovery on the Alba Block and an 80% operated working interest in the Corona well on Block D. We plan to develop Block D through a unitization with the Alba field. Negotiations have been substantially completed and approval is expected in 2016. We also have an 80% operated working interest in exploratory Block A-12 offshore Bioko Island, located immediately west of our operated Alba Field.

10


GabonExploration – We hold a 21.25% non-operated working interest in the Diaba License G4-223 and its related permit offshore Gabon, which covers approximately 2.2 million gross (477,000 net) acres. Multiple additional pre-salt prospects have been identified on this License.
In August 2014, we signed an exploration and production sharing contract for Gabon offshore Block G13, which was subsequently re-named Tchicuate. The block, which is located in the pre-salt play offshore Gabon, encompasses 277,000 acres. The seismic program was completed during 2015 and processing will occur through 2016. We hold a 100% participating interest and operatorship in the block. In the event of development, the Republic of Gabon will assume a 20% financed interest in the contract upon commencement of production. The State holds additional rights to participate in theTchicuate block in the future as a co-investor.
Kurdistan Region of Iraq – During 2015, in connection with our decision to scale back our conventionalwhere we have an exploration program, we impaired our investment in the operated Harir block.and production sharing agreement.
International E&P Disposition
In the third quarter of 2015,2017, we entered into an agreementseparate agreements to sell certain non-core properties in our East Africa exploration acreage in EthiopiaInternational E&P segment, and Kenya. The Kenyaa portion of this transaction closed in February 2016 and the Ethiopia transaction is expected to close during the first4th quarter of 2016.2017. See Item 8. Financial Statements and Supplementary Data - Note 5 to the consolidated financial statements for additional information about this disposition.these dispositions.
Oil Sands Mining SegmentReserves
We hold a 20% non-operated interest inProved reserves are required to be disclosed by continent and by country if the AOSP,proved reserves related to any geographic area, on an oil sands miningequivalent 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 upgrading joint venturethe Kurdistan Region of Iraq. Approximately 72% of our proved reserves are located in Alberta, Canada. Other JV partners include Shell Canada LimitedOECD countries, with a 60% ownership interest and Chevron Canada Limited with a 20% ownership interest. Shell Canada Limited operates70% located within the joint venture, which produces bitumen from oil sands deposits in the Athabasca region utilizing mining techniques and upgrades the bitumen into synthetic crude oils and vacuum gas oil.U.S.
The AOSP’s mining and extraction assets are located near Fort McMurray, Alberta, and include the Muskeg River and the Jackpine mines. Gross design capacity of the combined mines is 255,000 (51,000 net) barrels of bitumen per day. The AOSP operations use established processes to mine oil sands deposits from an open-pit mine, extract the bitumen and upgrade it into synthetic crude oils. Ore is mined using traditional truck and shovel mining techniques. The mined ore passes through a series of primary crushers and rotary breakers for particle size reduction. The particles are combined with hot water to create slurry. The slurry is hydro-transported to a primary separation vessel where it separates into sand, clay and bitumen-rich froth. A solvent is added to the bitumen froth to separate out the remaining solids, water and heavy asphaltenes. The solvent washes the sand and produces clean bitumen that is required for the upgrader to run efficiently. The process yields a mixture of solvent and bitumen which is then transported from the mine to the Scotford upgrader via the approximately 300-mile Corridor Pipeline.
The AOSP's Scotford upgrader is located at Fort Saskatchewan, northeast of Edmonton, Alberta.  The bitumen is upgraded at Scotford using both hydrotreating and hydroconversion processes to remove sulfur and break the heavy bitumen molecules into lighter products. Blendstocks acquired from outside sources are utilized in the productionfollowing tables set forth estimated quantities of our saleable products. The upgrader produces synthetictotal proved crude oilsoil and vacuumcondensate, NGLs and natural gas oil. The vacuum gasreserves based upon SEC pricing for period ended December 31, 2017.
   Africa    
December 31, 2017  U.S.  E.G.   Libya Total     Other Int'l Total from Cont Ops
Proved Developed Reserves           
Crude oil and condensate (mmbbl)
263
 39
 165
 204
 17
 484
Natural gas liquids (mmbbl)
118
 25
 
 25
 
 143
Natural gas (bcf)
726
 833
 94
 927
 2
 1,655
Total proved developed reserves  (mmboe)
502
 203
 181
 384
 17
 903
Proved Undeveloped Reserves      

   

Crude oil and condensate (mmbbl)
307
 
 
 
 9
 316
Natural gas liquids (mmbbl)
111
 
 
 
 
 111
Natural gas (bcf)
598
 
 110
 110
 6
 714
Total proved undeveloped reserves  (mmboe)
518
 
 18
 18
 10
 546
Total Proved Reserves      

   

Crude oil and condensate (mmbbl)
570
 39
 165
 204
 26
 800
Natural gas liquids (mmbbl)
229
 25
 
 25
 
 254
Natural gas (bcf)
1,324
 833
 204
 1,037
 8
 2,369
Total proved reserves (mmboe)
1,020
 203
 199
 402
 27
 1,449
Of the total estimated proved reserves, approximately 55% was crude oil is sold to an affiliate of the operator under a long-term contract at market-related prices and the other products are sold in the marketplace.
condensate. As of December 31, 2015, we own2017, our estimated proved developed reserves totaled 903 mmboe or have rights to participate in developed62% and estimated proved undeveloped surface mineable leasesreserves totaling approximately 159,000 gross (32,000 net) acres. The underlying developed leases are held for the duration of the project, with royalties payable to the province of Alberta. Synthetic crude oil sales volumes for 2015 averaged 53 mbbld and net-of-royalty production was 45 mbbld.
The operating cost structure546 mmboe or 38% of our Oil Sands Mining operations is predominantly fixed and therefore many of the costs incurred in times of full operation continue during production downtime. Per-unit costs are sensitive to production rates. As average price realizations are typically at a discount to WTI, the fixed operating cost structure for Oil Sands Mining will not fully track the price realization. Significant cost improvement efforts were employed in 2015 resulting in a material reduction to the production cost structure. See Item 7. Consolidated Results of Operations: 2015 compared to 2014 fortotal proved reserves. For additional detail on production expenses.
The governments of Albertareserves, see Item 8. Financial Statements and Canada agreed to partially fund Quest CCS. Construction began in 2012Supplementary Data - Supplementary Information on Oil and was completed in February 2015. Government funding commenced in 2012 and continued as milestones were achieved during the development, construction and operating phases of the project. Quest CCS was successfully completed and commissioned in the fourth quarter of 2015.gas Producing Activities.



11


Productive and Drilling Wells
For our North AmericaUnited States E&P and International E&P segments, the following table sets forth gross and net productive wells, and service wells as of December 31, 2015, 2014 and 2013 and drilling wells as of December 31 2015.for the years presented.
Productive Wells(a)
        Productive Wells       ��
Oil Natural Gas Service Wells   Drilling WellsOil Natural Gas Service Wells   Drilling Wells
Gross Net Gross Net Gross Net Gross NetGross Net Gross Net Gross Net Gross Net
2017               
U.S.5,132
 1,905
 1,690
 676
 799
 70
 33
 13
E.G.
 
 19
 12
 
 
 
 
Libya1,071
 175
 7
 2
 94
 16
 
 
Total Africa1,071
 175
 26
 14
 94
 16
 
 
Other International61
 22
 19
 7
 23
 8
 
 
Total6,264
 2,102
 1,735
 697
 916
 94
 33
 13
2016
              
U.S.(a)4,533
 1,650
 1,830
 708
 821
 85
    
E.G.
 
 17
 11
 2
 1
    
Libya1,071
 175
 7
 1
 94
 16
    
Total Africa1,071
 175
 24
 12
 96
 17
    
Other International62
 23
 35
 14
 23
 8
    
Total5,666
 1,848
 1,889
 734
 940
 110
    
2015                              
U.S.7,198
 2,878
 1,796
 750
 2,727
 747
 29
 12
7,198
 2,878
 1,796
 750
 2,727
 747
    
E.G.
 
 17
 11
 2
 1
 
 

 
 17
 11
 2
 1
    
Other Africa1,071
 175
 7
 1
 94
 16
 4
 1
Libya1,071
 175
 7
 1
 94
 16
    
Total Africa1,071
 175
 24
 12
 96
 17
 4
 1
1,071
 175
 24
 12
 96
 17
    
Other International59
 21
 39
 16
 24
 8
 1
 
59
 21
 39
 16
 24
 8
    
Total8,328
 3,074
 1,859
 778
 2,847
 772
 34
 13
8,328
 3,074
 1,859
 778
 2,847
 772
    
2014
              
U.S.(a)7,058
 2,919
 2,246
 1,023
 2,638
 760
    
E.G.
 
 16
 11
 2
 1
    
Other Africa1,071
 175
 7
 1
 94
 16
    
Total Africa1,071
 175
 23
 12
 96
 17
    
Other International55
 20
 39
 16
 24
 8
    
Total8,184
 3,114
 2,308
 1,051
 2,758
 785
    
2013               
U.S.6,632
 2,568
 2,763
 1,482
 2,349
 744
    
E.G.
 
 16
 11
 2
 1
    
Other Africa1,064
 174
 7
 1
 94
 16
    
Total Africa1,064
 174
 23
 12
 96
 17
    
Other International56
 21
 40
 16
 25
 9
    
Total7,752
 2,763
 2,826
 1,510
 2,470
 770
    
(a) 
Of theReduction in December 31, 2016 gross and net productive wells and service wells with multiple completions operated by us totaled 12, 31is primarily due to the dispositions of certain conventional West Texas and 31 as of December 31, 2015, 2014Wyoming assets in 2016. See Item 8. Financial Statements and 2013. Information on wells with multiple completions operated by others is unavailableSupplementary Data - Note 5 to us.the consolidated financial statements for information about these dispositions.



12


Drilling Activity
For our North AmericaUnited States E&P and International E&P segments, the following table below sets forth, by geographic area, the number of net productive and dry development and exploratory wells completed in eachas of December 31 for the last three years.years represented.
Development Exploratory  Development Exploratory  
Oil 
Natural
Gas
 Dry Total Oil 
Natural
Gas
 Dry Total TotalOil 
Natural
Gas
 Dry Total Oil 
Natural
Gas
 Dry Total Total
Year Ended December 31, 2015            
20172017            
U.S.135
 36
 11
 182
 49
 48
 1
 98
 280
107
 27
 
 134
 88
 16
 
 104
 238
E.G.
 1
 
 1
 
 
 1
 1
 2

 
 
 
 
 
 
 
 
Other Africa
 
 
 
 
 
 
 
 
Libya
 
 
 
 
 
 
 
 
Total Africa
 1
 
 1
 
 
 1
 1
 2

 
 

 
 
 
 
 
 
Other International1
 
 
 1
 
 
 
 
 1

 
 
 
 
 
 
 
 
Total136
 37
 11
 184
 49
 48
 2
 99
 283
107
 27
 
 134
 88
 16
 
 104
 238
Year Ended December 31, 2014            
20162016            
U.S.253
 43
 1
 297
 49
 19
 4
 72
 369
64
 12
 
 76
 70
 27
 
 97
 173
E.G.
 
 
 
 
 
 1
 1
 1

 
 
 
 
 
 
 
 
Other Africa1
 
 
 1
 
 
 
 
 1
Libya
 
 
 
 
 
 
 
 
Total Africa1
 
 
 1
 
 
 1
 1
 2

 
 
 
 
 
 
 
 
Other International1
 
 
 1
 
 
 
 
 1

 
 
 
 
 
 
 
 
Total255
 43
 1
 299
 49
 19
 5
 73
 372
64
 12
 
 76
 70
 27
 
 97
 173
Year Ended December 31, 2013            
20152015            
U.S.237
 20
 
 257
 73
 13
 3
 89
 346
135
 36
 11
 182
 49
 48
 1
 98
 280
E.G.
 
 
 
 
 
 
 
 

 1
 
 1
 
 
 1
 1
 2
Other Africa4
 
 
 4
 1
 
 2
 3
 7
Libya
 
 
 
 
 
 
 
 
Total Africa4
 
 
 4
 1
 
 2
 3
 7

 1
 
 1
 
 
 1
 1
 2
Other International
 
 
 
 
 
 3
 3
 3
1
 
 
 1
 
 
 
 
 1
Total241
 20
 
 261
 74
 13
 8
 95
 356
136
 37
 11
 184
 49
 48
 2
 99
 283
Acreage
We believe we have satisfactory title to our North AmericaUnited States E&P and International E&P 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 PSCsproduction sharing contracts or exploration licenses.
The following table sets forth, by geographic area, the gross and net developed and undeveloped acreage held in our North AmericaUnited States E&P and International E&P segments as of December 31, 2015.2017.
Developed Undeveloped 
Developed and
Undeveloped
Developed Undeveloped 
Developed and
Undeveloped
(In thousands)Gross     Net Gross     Net Gross     NetGross     Net Gross     Net Gross     Net
U.S.1,323
 1,035
 801
 638
 2,124
 1,673
1,529
 1,008
 388
 322
 1,917
 1,330
Canada
 
 142
 54
 142
 54
Total North America1,323
 1,035
 943
 692
 2,266
 1,727
E.G.45
 29
 183
 164
 228
 193
82
 67
 54
 36
 136
 103
Libya12,909
 2,108
 
 
 12,909
 2,108
Other Africa12,909
 2,108
 26,145
 9,612
 39,054
 11,720

 
 277
 277
 277
 277
Total Africa12,954
 2,137
 26,328
 9,776
 39,282
 11,913
12,991
 2,175
 331
 313
 13,322
 2,488
Other International90
 32
 345
 110
 435
 142
86
 31
 171
 32
 257
 63
Total14,367
 3,204
 27,616
 10,578
 41,983
 13,782
14,606
 3,214
 890
 667
 15,496
 3,881

13


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, additional undeveloped acreage listed in the table below will expire over the next threein future years. We plan to continue the terms of certain of these licenses and concession areas or retain leases through operational or administrative actions; however, the majority of the undeveloped acres associated with Other Africa as listed in the table below pertains to our licenses in Ethiopia and Kenya, for which we executed agreements in 2015 to sell. The Kenya transaction closed in February 2016 and the Ethiopia transaction is expected to close in the first quarter of 2016. See Item 8. Financial Statements and Supplementary Data - Note 5 to the consolidated financial statements for additional information about this disposition.actions.

Net Sales Volumes
 Net Undeveloped Acres Expiring
 Year Ended December 31,
(In thousands)2016 2017 2018
U.S.68
 89
 128
E.G.
 92
 36
Other Africa189
 4,352
 854
Total Africa189
 4,444
 890
Other International
 
 
Total257
 4,533
 1,018

14


Reserves
Estimated Reserve Quantities
Reserves are 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. We closed the sale of our East Texas/North Louisiana/Wilburton assets in the third quarter of 2015 and part of our Gulf of Mexico business in the fourth quarter of 2015. Additionally, we closed the sale of our Angola assets and our Norway business in 2014, and both are represented as discontinued operations ("Disc Ops") for periods presented. Approximately 77% of our proved reserves are located in OECD countries.
Our December 31, 2015 proved reserves were calculated using the unweighted average of closing prices nearest to the first day of each month within the 12-month period ("SEC pricing"). The table below provides the 2015 SEC pricing of benchmark prices as well as the unweighted average for the first two months of 2016:
 SEC Pricing 20152-month Average 2016
WTI Crude oil$50.28
$34.19
Henry Hub natural gas$2.59
$2.28
Brent crude oil$54.25
$34.86
Natural gas liquids$17.32
$12.87
When determining the December 31, 2015 proved reserves for each property, the 2015 SEC prices listed above were adjusted using price differentials that account for property-specific quality and location differences.
Beginning in the second half of 2014, the crude oil and natural gas benchmarks began to decline and these declines continued through 2015 and into 2016. Commodity prices are likely to remain volatile based on global supply and demand and could decline further. Sustained reduced commodity prices could have a material effect on the quantity and future cash flows of our proved reserves.
Estimates of future cash flows associated with proved reserves are based on actual costs of developing and producing the reserves as of the end of the year. The decline in commodity prices prompted a concerted effort to reduce the costs of developing and producing reserves. Therefore, the impact of sustained reduced commodity prices on future cash flows will be partially offset by the resulting lower costs to develop and produce reserves.
A sustained period of lower commodity prices could also result in additional decreases to our near term capital program and deferrals of investment until prices improve. A shifting of capital expenditures into future periods beyond five years from the initial proved reserve booking could potentially lead to a reduction in proved undeveloped reserves. See Item 1A. Risk Factors for a further discussion of how a substantial extended decline in commodity prices could impact us.
As of December 31, 2015, total proved reserves declined 35 mmboe, primarily due to negative revisions in the U.S. totaling 173 mmboe largely a result of reductions to our capital development program which deferred proved undeveloped reserves beyond the 5-year plan, as well as routine production. This decline was partially offset by increased reserves from the drilling programs in our U.S. unconventional shale plays totaling 246 mmboe as well as a positive revision of 67 mmboe in OSM. The OSM revision was a consequence of technical reevaluation and lower royalty percentages due to lower realized prices. Royalties paid in Canada are on a sliding scale; as the sales price of our synthetic crude oil decreases, our royalty rate decreases. See Item 8. Financial Statements and Supplementary Data - Supplementary Information on Oil and Gas Producing Activities for more information.

15


The following tables set forth estimated quantities of our proved crude oil and condensate, NGLs, natural gas and synthetic crude oil reserves based upon an SEC pricing for periods ended December 31, 2015, 2014 and 2013.
 North America Africa        
December 31, 2015  U.S.  Canada Total   E.G.   Other Total     Other Int'l Cont Ops Disc Ops Total
Proved Developed Reserves                   
Crude oil and condensate (mmbbl)
327
 
 327
 25
 173
 198
 16
 541
 
 541
Natural gas liquids (mmbbl)
92
 
 92
 12
 
 12
 
 104
 
 104
Natural gas (bcf)
640
 
 640
 552
 94
 646
 11
 1,297
 
 1,297
Synthetic crude oil (mmbbl)

 698
 698
 
 
 
 
 698
 
 698
Total proved developed reserves  (mmboe)
526
 698
 1,224
 129
 189
 318

18
 1,560
 

1,560
Proved Undeveloped Reserves            
 
   
Crude oil and condensate (mmbbl)
253
 
 253
 27
 28
 55
 6
 314
 
 314
Natural gas liquids (mmbbl)
80
 
 80
 16
 
 16
 
 96
 
 96
Natural gas (bcf)
511
 
 511
 538
 112
 650
 4
 1,165
 
 1,165
Synthetic crude oil (mmbbl)

 
 
 
 
 
 
 
 
 
Total proved undeveloped reserves  (mmboe)
418
 
 418
 132
 46
 178
 7
 603
 
 603
Total Proved Reserves            
 
   
Crude oil and condensate (mmbbl)
580
 
 580
 52
 201
 253
 22
 855
 
 855
Natural gas liquids (mmbbl)
172
 
 172
 28
 
 28
 
 200
 
 200
Natural gas (bcf)
1,151
 
 1,151
 1,090
 206
 1,296
 15
 2,462
 
 2,462
Synthetic crude oil (mmbbl)

 698
 698
 
 
 
 
 698
 
 698
Total proved reserves (mmboe)
944
 698
 1,642
 261
 235
 496
 25
 2,163
 
 2,163
 North America Africa        
December 31, 2014  U.S.  Canada Total   E.G.   Other Total     Other Int'l Cont Ops Disc Ops Total
Proved Developed Reserves                   
Crude oil and condensate (mmbbl)
294
 
 294
 30
 175
 205
 19
 518
 
 518
Natural gas liquids (mmbbl)
68
 
 68
 15
 
 15
 
 83
 
 83
Natural gas (bcf)
575
 
 575
 664
 94
 758
 17
 1,350
 
 1,350
Synthetic crude oil (mmbbl)

 644
 644
 
 
 
 
 644
 
 644
Total proved developed reserves (mmboe)
458
 644
 1,102
 155
 191
 346
 22
 1,470
 
 1,470
Proved Undeveloped Reserves                   
Crude oil and condensate (mmbbl)
340
 
 340
 27
 33
 60
 10
 410
 
 410
Natural gas liquids (mmbbl)
93
 
 93
 15
 
 15
 1
 109
 
 109
Natural gas (bcf)
569
 
 569
 541
 115
 656
 5
 1,230
 
 1,230
Synthetic crude oil (mmbbl)

 4
 4
 
 
 
 
 4
 
 4
Total proved undeveloped reserves (mmboe)
528
 4
 532
 133
 52
 185
 11
 728
 
 728
Total Proved Reserves                   
Crude oil and condensate (mmbbl)
634
 
 634
 57
 208
 265
 29
 928
 
 928
Natural gas liquids (mmbbl)
161
 
 161
 30
 
 30
 1
 192
 
 192
Natural gas (bcf)
1,144
 
 1,144
 1,205
 209
 1,414
 22
 2,580
 
 2,580
Synthetic crude oil (mmbbl)


648
 648


 
 


 648
 

648
Total proved reserves (mmboe)
986
 648
 1,634
 288
 243
 531
 33
 2,198
 
 2,198

16


 North America Africa        
December 31, 2013  U.S.  Canada Total   E.G.   Other Total     Other Int'l Cont Ops Disc Ops Total
Proved Developed Reserves              
Crude oil and condensate (mmbbl)
241
 
 241
 37
 176
 213
 19
 473
 77
 550
Natural gas liquids (mmbbl)
51
 
 51
 18
 
 18
 1
 70
 
 70
Natural gas (bcf)
540
 
 540
 823
 95
 918
 21
 1,479
 20
 1,499
Synthetic crude oil (mmbbl)

 674
 674
 
 
 
 
 674
 
 674
Total proved developed reserves (mmboe)
382
 674
 1,056
 193
 192
 385
 23
 1,464
 80
 1,544
Proved Undeveloped Reserves              
Crude oil and condensate (mmbbl)
256
 
 256
 27
 39
 66
 6
 328
 14
 342
Natural gas liquids (mmbbl)
68
 
 68
 16
 
 16
 
 84
 
 84
Natural gas (bcf)
485
 
 485
 497
 110
 607
 7
 1,099
 73
 1,172
Synthetic crude oil (mmbbl)

 6
 6
 
 
 
 
 6
 
 6
Total proved undeveloped reserves (mmboe)
405
 6
 411
 125
 57
 182
 8
 601
 26
 627
Total Proved Reserves     

       

Crude oil and condensate (mmbbl)
497
 
 497
 64
 215
 279
 25
 801
 91
 892
Natural gas liquids (mmbbl)
119
 
 119
 34
 
 34
 1
 154
 
 154
Natural gas (bcf)
1,025
 
 1,025
 1,320
 205
 1,525
 28
 2,578
 93
 2,671
Synthetic crude oil (mmbbl)

 680
 680
 
 
 
 
 680
 
 680
Total proved reserves (mmboe)
787
 680
 1,467
 318
 249
 567
 31
 2,065
 106
 2,171
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, NGLs, natural gas and synthetic crude oil reserve estimates are reviewed and approved by our Corporate Reserves Group, 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 engineers or geoscientists who 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 Marathon Oil's QRE training course. All QREs must complete a QRE refresher course at least once every three years. Our Corporate Reserves group screens all fields with net proved reserves of 20 mmboe or greater, every year, to determine if a field review is required. Any change to proved reserve estimates in excess of 1 mmboe on a total field basis, within a single month, must be approved by a Reserve Coordinator.
Our Director of Corporate Reserves, who reports to our Vice President, Technology and Innovation, has a Bachelor of Science degree in petroleum engineering and is a registered Professional Engineer in the State of Texas. In his 28 years with Marathon Oil, he has held numerous engineering and management positions, including managing our OSM segment. He is a member of the Society of Petroleum Engineers ("SPE") and a former member of the Petroleum Engineering Advisory Council for the University of Texas at Austin.
Estimates of synthetic crude oil reserves are prepared by GLJ Petroleum Consultants ("GLJ") of Calgary, Alberta, Canada, third-party consultants. Their reports for all years are filed as exhibits to this Annual Report on Form 10-K. The individual responsible for the estimates of our synthetic crude oil reserves has 15 years of experience in petroleum engineering, has conducted surface mineable oil sands evaluations since 2009 and is a registered Practicing Professional Engineer in the Province of Alberta.
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, 2015, with 82% of our total proved reserves independently audited. We have established a tolerance level of +/- 10% such that initial estimates by the third-party consultants for each field are accepted if they are within 10% of our internal estimates. Should the third-party consultants’ initial analysis fail to reach our tolerance level, both parties 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 2015, 2014 or 2013.

17


During 2015, 2014 and 2013, Netherland, Sewell & Associates, Inc. ("NSAI") prepared a certification of the prior year's reserves for the Alba field in E.G. The NSAI summary reports are 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. The senior technical advisor has over 35 years of practical experience in petroleum geosciences, with over 15 years experience in the estimation and evaluation of reserves. The second team member has over 10 years of practical experience in petroleum engineering, with over five years experience in the estimation and evaluation of reserves. Both are registered Professional Engineers in the State of Texas.
Ryder Scott Company ("Ryder Scott") also performed audits of the prior years' reserves of several of our fields in 2015, 2014 and 2013. Their summary reports are filed as exhibits to this Annual Report on Form 10-K. The team lead for Ryder Scott has over 20 years of industry experience, having worked for a major international oil and gas company before joining Ryder Scott. He is a member of SPE, where he served on the Oil and Gas Reserves Committee, and is a registered Professional Engineer in the State of Texas.
Changes in Proved Undeveloped Reserves
As of December 31, 2015, 603 mmboe of proved undeveloped reserves were reported, a decrease of 125 mmboe from December 31, 2014. The following table shows changes in total proved undeveloped reserves for 2015:
(mmboe)
Beginning of year728
Revisions of previous estimates(223)
Improved recovery1
Purchases of reserves in place1
Extensions, discoveries, and other additions175
Dispositions
Transfers to proved developed(79)
End of year603
The revisions to previous estimates were largely due to a result of reductions to our capital development program which deferred proved undeveloped reserves beyond the 5-year plan. A total of 139 mmboe was booked as extensions, discoveries or other additions and revisions due to the application of reliable technology. Technologies included statistical analysis of production performance, decline curve analysis, pressure and rate transient 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.
Transfers from proved undeveloped to proved developed reserves included 47 mmboe in the Eagle Ford, 14 mmboe in the Bakken and 5 mmboe in the Oklahoma Resource Basins due to development drilling and completions.
Costs incurred in 2015, 2014 and 2013 relating to the development of proved undeveloped reserves were $1,415 million, $3,149 million and $2,536 million.
Projects can remain in proved undeveloped reserves for extended periods in certain situations such as large development projects which take more than five years to complete, or the timing of when additional gas compression is needed. Of the 603 mmboe of proved undeveloped reserves at December 31, 2015, 26% of the volume is associated with projects that have been included in proved reserves for more than five years. The majority of this volume is related to a compression project in E.G. that was sanctioned by our Board of Directors in 2004. During 2012, the compression project received the approval of the E.G. government, fabrication of the new platform began in 2013 and installation of the platform at the Alba Field occurred in January 2016. Commissioning is currently underway, with first production expected by mid-2016.
Proved undeveloped reserves for the North Gialo development, located in the Libyan Sahara desert, were booked for the first time in 2010. This development is being executed by the operator and encompasses a multi-year drilling program including the design, fabrication and installation of extensive liquid handling and gas recycling facilities. Anecdotal evidence from similar development projects in the region leads to an expected project execution time frame of more than five years from the time the reserves were initially booked. Interruptions associated with the civil and political unrest have also extended the project duration. Operations were interrupted in mid-2013 as a result of the shutdown of the Es Sider crude oil terminal, and although temporarily re-opened during the second half of 2014, production remains shut-in through early 2016. The operator is committed to the project’s completion and continues to assign resources in order to execute the project.
Our conversion rate for proved undeveloped reserves to proved developed reserves for 2015 was 11%.  However, excluding the aforementioned long-term projects in E.G. and Libya, our 2015 conversion rate would be 15%.  Furthermore, our

18


5-year annual conversion rate (2011-2015) averaged 21% and would be 32%, excluding the long-term projects in E.G. and Libya.
All proved undeveloped reserve drilling locations are scheduled to be drilled prior to the end of 2020. As of December 31, 2015, future development costs estimated to be required for the development of proved undeveloped crude oil and condensate, NGLs, natural gas and synthetic crude oil reserves for the years 2016 through 2020 are projected to be $630 million, $859 million, $1,389 million, $1,764 million and $986 million.
Net Production Sold
North America Africa 
    
Africa 
      
  U.S.  Canada Total   E.G.   Other Total     Other Int'l
 Disc Ops 

Total
  U.S.  E.G.   Libya Other Int'l Cont Ops Disc Ops 
Total
Year Ended December 31,                              
20172017            
Crude and condensate (mbbld)(a)
133
 21
 19
 12
 185
 
 185
Natural gas liquids (mbbld)
43
 11
 
 1
 55
 
 55
Natural gas (mmcfd)(b)
348
 459
 4
 22
 833
 
 833
Synthetic crude oil (mbbld)(c)

 
 
 
 
 18
 18
Total sales volumes (mboed)
234
 109
 20
 16
 379
 18
 397
20162016       
   
Crude and condensate (mbbld)(a)
131
 20
 3
 12
 166
 
 166
Natural gas liquids (mbbld)
40
 11
 
 
 51
 
 51
Natural gas (mmcfd)(b)
314
 425
 
 28
 767
 
 767
Synthetic crude oil (mbbld)(c)

 
 
 
 
 48
 48
Total sales volumes (mboed)
223
 102
 3
 17
 345
 48
 393
20152015                2015       
   
Crude and condensate (mbbld)(a)
171
 
 171
 19
 
 19
 14
 
 204
171
 19
 
 14
 204
 
 204
Natural gas liquids (mbbld)
39
 
 39
 10
 
 10
 
 
 49
39
 10
 
 
 49
 
 49
Natural gas (mmcfd)(b)
351
 
 351
 410
 
 410
 21
 
 782
351
 410
 
 21
 782
 
 782
Synthetic crude oil (mbbld)(c)

 45
 45
 
 
 
 
 
 45

 
 
 
 
 45
 45
Total production sold (mboed)
269
 45
 314
 97
 
 97
 18
 
 429
2014   
     
     
Crude and condensate (mbbld)(a)
157
 
 157
 21
 7
 28
 11
 48
 244
Natural gas liquids (mbbld)
29
 
 29
 10
 
 10
 
 
 39
Natural gas (mmcfd)(b)
310
 
 310
 439
 1
 440
 21
 37
 808
Synthetic crude oil (mbbld)(c)

 41
 41
 
 
 
 
 
 41
Total production sold (mboed)
238
 41
 279
 104
 7
 111
 15
 54
 459
2013   
     
     
Crude and condensate (mbbld)(a)
126
 
 126
 23
 24
 47
 14
 81
 268
Natural gas liquids (mbbld)
23
 
 23
 11
 
 11
 1
 
 35
Natural gas (mmcfd)(b)
312
 
 312
 442
 22
 464
 25
 51
 852
Synthetic crude oil (mbbld)(c)

 42
 42
 
 
 
 
 
 42
Total production sold (mboed)
201
 42
 243
 107
 27
 134
 20
 89
 486
Total sales volumes (mboed)
269
 97
 
 18
 384
 45
 429
(a) 
The amounts correspond with the basis for fiscal settlements with governments, representing equity tanker liftings and direct deliveries of liquid hydrocarbons.
(b) 
Excludes volumesIncludes natural gas acquired from third parties for injection and subsequent resale.
(c) 
Upgraded bitumen excluding blendstocks.
Average Sales Price per Unit

 North America Africa 
    
(Dollars per unit)  U.S.  Canada Total   E.G.   Other Total     Other Int'l
 Disc Ops 

Total
2015                
Crude and condensate (bbl)
$43.50
 $
 $43.50
 $42.83
 $
 $42.83
 $53.91
 $
 $44.14
Natural gas liquids (bbl)
13.37
 
 13.37
 1.00
(a) 

 1.00
 32.53
 
 11.16
Natural gas (mcf)
2.66
 
 2.66
 0.24
(a) 

 0.24
 6.85
 
 1.50
Synthetic crude oil (bbl)

 40.13
 40.13
 
 
 
 
 
 40.13
2014                
Crude and condensate (bbl)
$85.25
 $
 $85.25
 $81.01
 $94.70
 $84.48
 $94.31
 $109.80
 $90.37
Natural gas liquids (bbl)
33.42
 
 33.42
 1.00
(a) 

 1.00
 67.73
 
 25.25
Natural gas (mcf)
4.57
 
 4.57
 0.24
(a) 
3.11
 0.25
 8.27
 9.94
 2.55
Synthetic crude oil (bbl)

 83.35
 83.35
 
 
 
 
 
 83.35
2013                
Crude and condensate (bbl)
$94.19
 $
 $94.19
 $90.62
 $122.92
 $107.31
 $110.76
 $112.36
 $102.81
Natural gas liquids (bbl)
35.12
 
 35.12
 1.00
(a) 

 1.00
 72.14
 
 24.78
Natural gas (mcf)
3.84
 
 3.84
 0.24
(a) 
5.44
 0.49
 10.64
 13.01
 2.75
Synthetic crude oil (bbl)

 87.51
 87.51
 
 
 
 
 
 87.51
(a)
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 E&P Segment.

19


Average Production Cost per Unit(a) 
North America Africa        Africa        
(Dollars per boe)  U.S.  Canada Total   E.G.   Other Total     Other Int'l Disc Ops 

Total
  U.S.  E.G.   Libya Other Int'l Cont Ops Disc Ops 

Total
2017$9.49
 $2.12
 $6.08
 $26.61
 $7.90
 $29.72
 $9.23
20169.84
 2.17
 N.M.
 23.13
 8.41
 29.36
 11.02
2015$10.65
 $38.42
 $14.69
 $2.37
 N.M.
 $3.23
 $27.23
 $
 $12.62
10.65
 2.37
 N.M.
 27.23
 9.54
 38.42
 12.62
201413.34
 46.63
 18.73
 4.03
 N.M.
 5.72
 47.06
 8.92
 15.37
201313.60
 55.42
 20.79
 2.88
 7.40
 3.80
 38.87
 8.24
 14.51
(a) 
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.
N.M. Not meaningful information due to limited sales.

Average Sales Price per Unit(a)
 
 Africa 
    
(Dollars per unit)  U.S.  E.G.   Libya Total     Other Int'l Disc Ops 
Total
2017            
Crude and condensate (bbl)
$49.35
 $46.02
 $60.72
 $53.11
 $52.66
 $
 $50.38
Natural gas liquids (bbl)
20.55
 1.00
(b) 

 1.00
 39.65
 
 16.65
Natural gas (mcf)
2.84
 0.24
(b) 
5.03
 0.28
 6.28
 
 1.51
Synthetic crude oil (bbl)

 
 
 
 
 47.39
 47.39
2016            
Crude and condensate (bbl)
$38.57
 $38.85
 $57.69
 $40.95
 $43.21
 $
 $39.23
Natural gas liquids (bbl)
13.15
 1.00
(b) 

 1.00
 26.41
 
 10.68
Natural gas (mcf)
2.38
 0.24
(b) 

 0.24
 4.80
 
 1.26
Synthetic crude oil (bbl)

 
 
 
 
 37.57
 37.57
2015            
Crude and condensate (bbl)
$43.50
 $42.83
 $
 $42.83
 $53.91
 $
 $44.14
Natural gas liquids (bbl)
13.37
 1.00
(b) 

 1.00
 32.53
 
 11.16
Natural gas (mcf)
2.66
 0.24
(b) 

 0.24
 6.85
 
 1.50
Synthetic crude oil (bbl)

 
 
 
 
 40.13
 40.13
N.M.
(a)
Not meaningful information due to limited sales.Excludes gains or losses on commodity derivative instruments.
(b)
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 E&P Segment.

Marketing and Midstream
Our reportable operating segments include activities related to the marketing and transportation of substantially all of our liquid hydrocarbon, synthetic crude oil and condensate, NGLs and natural gas production.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.
As discussed previously, we currently own and operate gathering systems and other midstream assets in some of our production areas. We continue to evaluate midstream infrastructure investments in connection with our development plans.
Gross Delivery Commitments
We have committed to deliver gross quantities of crude oil and synthetic crude oil, natural gas liquidscondensate, NGLs and natural gas to customers under a variety of contracts. As of December 31, 2015, those2017, the contracts for fixed and determinable quantities were at variable, market-based pricing and related primarily to liquid hydrocarbon production in the Eagle Ford and Bakken, and OSM synthetic crude oil production. Eagle Ford liquid hydrocarbon production sales commitments range from a minimum of 128 mbbld in 2016, decreasing to 51 mbbld through 2020. Bakken liquid hydrocarbon production sales commitments range from 10 mbbld to 30 mbbld from 2016 through 2026. Synthetic crude oil production sales commitments are 14 mbbld in 2016 and 10 mbbld in 2017. Eagle Ford natural gas production sales commitments range from a minimum of 210 mmbtu in 2016, decreasing to 46 mmbtu through 2022.following commitments:
Our current production rates, forecasts and proved reserves are sufficient to meet these commitments.
  2018 2019 2020 Thereafter Commitment Period Through
Eagle Ford          
Crude and condensate (mbbld)
 95
 65
 51
  2020
Natural gas liquids (mbbld)
 1
 1
 
  2020
Natural gas (mmcfd)
 168
 168
 168
 46 - 70 2022
Bakken          
Crude and condensate (mbbld)
 10
 10
 10
 5 - 10 2027
Natural gas (mmcfd)
 2
 2
 2
 2 - 25 2027
Oklahoma
 
          
Natural gas (mmcfd)

 
 90
 118
 110 - 148 2030
All of these contracts provide the options of delivering third-party volumes or paying a monetary shortfall penalty if production is inadequate. Certain volumetric requirements can also be met through purchases of third-party volumes.
In addition to the sales 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.

Competition and Market Conditions
Competition exists in all sectors of the oil and gas industry and in particular, in the exploration for and development of new reserves. Wewe compete with major integrated and independent oil and gas companies, as well as national oil companies,companies. We compete, in particular, in the exploration for theand 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.
We also compete with other producers of synthetic crude oil for the sale of our synthetic crude oil to refineries primarily in North America. Because not all refineries are able to process or refine synthetic crude oil in significant volumes, sufficient market demand may not exist at all times to absorb our share of the synthetic crude oil production from the AOSP at economically viable prices.
Our operating results are affected by price changes for liquid hydrocarbons and natural gas, as well as changes in competitive conditions in the markets we serve. Generally, results from oil and gas production and OSM operations benefit from higher liquid hydrocarbons and natural gas prices. Market conditions in the oil and gas industry are cyclical and subject to global economic and political events and new and changing governmental regulations. See Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations, Overview – Market Conditions for additional discussion of the impact of prices on our operations.

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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. Major U.S. federal statutes include, but are not limited to, the Occupational Safety and Health Act ("OSHA") with respect to the protection of the health and safety of employees, the Clean Air Act ("CAA") with respect to air emissions, the Federal Water Pollution Control Act (also known as the Clean Water Act ("CWA")) with respect to water discharges, the Comprehensive Environmental Response, Compensation, and Liability Act ("CERCLA") with respect to releases and remediation of hazardous substances, the Oil Pollution Act of 1990 ("OPA-90") with respect to oil pollution and response, the National Environmental Policy Act with respect to evaluation of environmental impacts, the Endangered Species Act with respect to the protection of endangered or threatened species, the Resource Conservation and Recovery Act ("RCRA") with respect to solid and hazardous waste treatment, storage and disposal and the U.S. Emergency Planning and Community Right-to-Know Act with respect to the dissemination of information relating to certain chemical inventories. Other countries in which we operate have their own laws dealing with similar matters.
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. 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.
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 have filed lawsuits in California and New York 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 six of these lawsuits in California, 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. This more stringent ozone NAAQS could result in additional areas being designated 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. The EPA anticipates promulgating final area designations under the new standard in the first half of 2018. Although there may be 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 September 2015, the EPA published a suite of proposed rules specifically targeting methane emissions from the oil and gas industry, aggregation of air emissions sources and minor source permitting for operations on tribal lands. These rules are expected to be finalized in 2016. If we are unable to comply with the final terms of these regulations, we could be required to forego construction, modification or certain operations. These regulations may also increase compliance costs for some facilities we own or operate, and result in administrative, civil and/or criminal penalties for non-compliance.

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In 2010, the EPA promulgated rules that require us to monitor and submit an annual report on our greenhouse gas emissions. Further, state, national and international requirements to reduce greenhouse emissions are being proposed and in some cases promulgated (see discussion above regarding proposed regulation of methane emissions from the oil and gas industry by the EPA). Potential legislation and regulations pertaining to climate change could also affect our operations. The cost to comply with these laws and regulations cannot be estimated at this time.
In JanuaryNovember 2016, the Bureau of Land Management (“BLM”) proposedissued 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 and has indicated that the requirements could be rescinded or significantly revised in the future. If thenot withdrawn or significantly revised, this rule is finalized as proposed, it couldexpected to result in additional costs of compliance as well as increased monitoring, recordkeeping and recording for some of our facilities.  If we are unable to comply with the final terms of these regulations, we could be required to forego certain operations. These regulations may also result in administrative, civil and/or criminal penalties for non-compliance.
For additional information, see Item 1A. Risk Factors. 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.
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. Federal, state and local-level laws or regulations targeting various aspects of the hydraulic fracturing process are being considered, or have been proposed or implemented. For example, the U.S. Congress has considered legislation that would require additional regulation affecting the hydraulic fracturing process, and may be expected to do so in future legislative sessions. Further, variousVarious 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. In addition to such legislative and regulatory proposals, there are also a number of studies and initiatives underway that may lead to additional proposals in the future, such as the EPA research study on the potential effects that hydraulic fracturing may have on water quality and public health. In 2015 the BLM issued a rule governing certain hydraulic fracturing practices on lands within their jurisdiction. While this rule has been stayed nationwide by court ruling, further findings by the court could result in additional changes to this new rule.
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.
State and federal regulatory agencies recently have focused on a possible connection between the operation of injection wells used for oil and gas waste disposal and seismic activity. Similar concerns have been raised that hydraulic fracturing may also contribute to seismic activity.  When caused by human activity, such events are called induced seismicity. In a few instances, operators of injection wells in the vicinity of seismic events have been ordered to reduce injection volumes or suspend operations. A 2012 report published by the National Academy of Sciences concluded that only a very small fraction of the tens of thousands of injection wells have been suspected to be, or have been, the likely cause of induced seismicity; and a 2015 report by researchers at the University of Texas has suggested that the link between seismic activity and wastewater disposal may vary by region.  Some state regulatory agencies have modified their regulations to account for induced seismicity. Regulatory agencies at all levels are continuing to study the possible linkage between oil and gas activity and induced seismicity.  In addition, a number of lawsuits have been filed including recent negligence suits and a RCRA citizen suit in Oklahoma alleging that disposal well operations have caused damage to neighboring properties or otherwise violated state and federal rules regulating waste disposal.  These developments could result in additional regulation and restrictions on the use of injection wells and hydraulic fracturing.  Increased regulation and attention given to induced seismicity could lead to greater opposition, including litigation, to oil and gas activities utilizing hydraulic fracturing or injection wells for waste disposal. 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 induced seismicity

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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.
Transportation
A number of state and federal rules apply to the transportation of liquid hydrocarbons. In 2014, the U.S. Department of Transportation (“DOT”) finalized a rule relating to testing and classification of liquid hydrocarbons and imposing additional restrictions on the types of rail cars that may be used in certain types of liquid hydrocarbon service. Although our businesses do not own rail cars and purchasers of our liquid hydrocarbons make arrangements for its transportation, such regulations could increase transportation costs which are passed on to Marathon Oil by liquid hydrocarbon purchasers. In addition, the Pipeline and Hazardous Materials Safety Administration, a sub-agency of DOT, has proposed or announced the intention to propose various rules related to pipeline transportation of natural gas and/or liquid hydrocarbons. Such regulations could increase the regulatory burden on our businesses where we own or operate pipelines or could otherwise increase costs to third parties that are passed on to Marathon Oil.
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 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. If this 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 2015,2017, sales to Irving Oil and Shell OilVitol and each of their respective affiliates accounted for approximately 13% and 11%10% of our total revenues. In 2014,2016, 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. In 2015, sales to Shell Oil and its affiliates accounted for approximately 10% of our total revenues. In 2013, Statoil, the purchaser of the majority of our Libyan crude oil, accounted for approximately 10% of our total revenues.

Trademarks, Patents and Licenses
We currently hold a number of U.S. and foreign patents and have various pending patent applications.patents. Although in the aggregate our trademarks, patents and licenses are important to us, we do not regard any single trademark, patent, license or group of related trademarks, patents or licenses as critical or essential to our business as a whole.
Employees
We had 2,611approximately 2,300 active, full-time employees as of December 31, 2015. We consider labor relations with our employees to be satisfactory. We have not had any work stoppages or strikes pertaining to our employees.2017.

Executive Officers of the Registrant
The executive officers of Marathon Oil and their ages as of February 1, 2016,2018, are as follows:
Lee M. Tillman 5456 President and Chief Executive Officer
John R. SultDane E. Whitehead 56 Executive Vice President and Chief Financial Officer
Sylvia J. KerriganT. Mitch Little54Executive Vice President—Operations
Reginald D. Hedgebeth 50 ExecutiveSenior Vice President, General Counsel and Secretary
Patrick J. Wagner53Executive Vice President-Corporate Development and Strategy
Catherine L. Krajicek 54Vice President—Technology and Innovation
T. Mitch Little5256 Vice President—Conventional
Lance W. Robertson43Vice President—Resource Plays
Patrick J. Wagner51Vice President, Corporate Development
Gary E. Wilson 5456 Vice President, Controller and Chief Accounting Officer
Mr. Tillman was appointed president and chief executive officer in August 2013.  Mr. Tillman is also a member of our Board of Directors.  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.

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Mr. SultWhitehead was appointed executive vice president and chief financial officer in September 2013.March 2017. Prior to joining Marathon Oil,this appointment, Mr. SultWhitehead 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 (a natural gas provider) from 2010 through 2012,Corporation's executive committee. He joined El Paso Exploration & Production Company as senior vice president and chief financial officer from 2009 to 2010,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 chief accounting officer and controller from 2005 to 2009.CFO of Burlington Resources Canada.
Ms. KerriganMr. 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 October 2012, havingApril 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 company), and vice president of legal for The Home Depot, Inc. (home improvement supplies retailing 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 November 2009.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 these appointments, Ms. Kerriganthis appointment, he served as assistant general counsel since January 2003.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, exploitation. 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.
Ms. Krajicek was appointed vice president—conventional assets in August 2016 after having served as vice president of technology and innovation insince December 2015, having2015. Prior to that, Ms. Krajicek served as vice president, health, environment, safety and security sincefrom January 2015 through December 2015. Prior to that,In January 2018 Ms. Krajicek announced her plans to retire effective April 1, 2018. Ms. Krajicek joined Marathon Oil in 2007 and has since held a number of positions of increasing responsibility with Marathon Oil.responsibility. Prior to joining the Company, in 2007, Ms. Krajicek spent 22 years with Conoco and then ConocoPhillips (a multinational energy corporation), where she held a variety of reservoir engineering and asset management and development management positions for upstream and mid-stream businesses under development, both in the U.S. and internationally.
Mr. Little was appointed vice president—conventional in December 2015, having served as 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 for 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. Robertson was appointed vice president—resource plays in December 2015, having served as vice president, North America production operations since September 2013 and as vice president, Eagle Ford production operations since October 2012.  Mr. Robertson joined Marathon Oil in October 2011 as regional vice president, South Texas/Eagle Ford.  Between 2004 and 2011, Mr. Robertson held a number of senior engineering and operations management roles of increasing responsibility with Pioneer Natural Resources Company (an independent oil and gas company) in the U.S. and Canada.
Mr. Wagner was appointed vice president—corporate development in April 2014. Prior to joining Marathon Oil, 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 (a private equity firm), which he joined in early 2012 as vice president, exploitation. Prior to that, 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, 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.
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.
The public may read and copy any materials we file with the SEC at its Public Reference Room at 100 F Street, NE, Washington, DC 20549. Information on the operation of the Public Reference Room may be obtained by calling the SEC at 1-800-SEC-0330. The SEC also 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.

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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.
The recentA substantial decline in liquid hydrocarboncrude oil and condensate, NGLs and natural gas prices has reducedwould reduce our operating results and cash flows and if continued, could adversely impact our future rate of growth and the carrying value of our assets.
PricesThe markets for crude oil and condensate, NGLs and natural gas have been volatile and synthetic crude oilare 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 natural gas and synthetic crude oil. Historically, the markets for crude oil and condensate, NGLs, natural gas and synthetic crude oil have been volatile and may continue to be volatile in the future. Beginning in the second half of 2014 and continuing into 2016, prices for WTI and Brent crude oil, Henry Hub natural gas and natural gas liquids have substantially declined. Furthermore, crude oil and natural gas futures prices indicate that these lower prices may persist for the foreseeable future.gas. Many of the factors influencing prices of crude oil and condensate, NGLs and natural gas and synthetic crude oil are beyond our control. These factors include:
worldwide and domestic supplies of and demand for crude oil and condensate, NGLs and natural gas and synthetic crude oil;gas;
the cost of exploring for, developing and producing crude oil and condensate, NGLs and natural gas and synthetic crude oil;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 and synthetic crude oil are uncertain. The recent substantialHistorical declines in commodity prices already have adversely affected our business by:
reducing the amount of crude oil and condensate, NGLs and natural gas and synthetic crude oil 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;
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 synthetic crude oil;gas; and
increasing the costs of obtaining capital, such as equity and short- and long-term debt.
A further prolonged extensionEstimates of prices at these levels could extend or exacerbate these adverse effects.

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A substantial, extended decline in liquid hydrocarbon orcrude 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. Prior to 2016, the synthetic

crude oil reserves estimates, included in discontinued operations, were prepared by GLJ, a third-party consulting firm experienced in working with oil sands. Reserves were valued based on SEC pricing for the periods ended December 31, 2017, 2016 and 2015, as well as other conditions in existence at those dates. The table below provides the 2017 SEC pricing for certain benchmark prices:
 SEC Pricing 2017
WTI Crude oil (per bbl)$51.34
Henry Hub natural gas (per mmbtu)$2.98
Brent crude oil (per bbl)$54.39
Mont Belvieu NGLs (per bbl)$22.03
If commodity prices were to decrease by approximately 10% below average prices used to estimate 2017 proved reserves (see table above), 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.
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 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 sands mining or liquid hydrocarbon orand condensate, NGLs and natural gas, transportation, with partners 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 remain at or fall below current levels,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 to fund their portion of the costs under our joint venture agreements, or the nonperformance by purchasers, contractors or other counterparties of their obligations to us, could negatively impact our operating results and cash flows.
Our offshore operations involve special risks that could negatively impact us.
Offshore exploration and development operations present technological challenges and operating risks because of the marine environment.  Activities in deepwater areas may pose incrementally greater risks because of water depths that limit intervention capability and 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.
Estimates of crude oil and condensate, NGLs, natural gas and synthetic crude oil 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 liquid hydrocarbon and natural gas reserves were prepared by our in-house teams of reservoir engineers and geoscience professionals and were reviewed and approved by our Corporate Reserves Group. The synthetic crude oil reserves estimates were prepared by GLJ, a third-party consulting firm experienced in working with oil sands. Reserves were valued based on SEC pricing for the periods ended December 31, 2015, 2014 and 2013, as well as other conditions in existence at those dates. The table below provides the 2015 SEC pricing for certain benchmark prices as well as the unweighted average for the first two months of 2016:
 SEC Pricing 20152-month Average 2016
WTI Crude oil$50.28
$34.19
Henry Hub natural gas$2.59
$2.28
Brent crude oil$54.25
$34.86
Natural gas liquids$17.32
$12.87
Any significant future price change could have a material effect on the quantity and present value of our proved reserves. To the extent that commodity prices remain at current or lower levels throughout 2016, a portion of our proved reserves could be deemed uneconomic and no longer classified as proved. This could impact both proved developed producing reserves as well as proved undeveloped reserves. If prices remain at the 2-month average depicted above throughout 2016, a material volume of our proved reserves could become uneconomic and would have to be reclassified to non-proved reserve or resource category. Assuming lower SEC pricing in 2016, our OSM proved reserves represent the largest risk to be reclassified to non-proved reserve or resource category. However, any impact of lower SEC pricing will likely be partially offset by continued cost reduction efforts. Also, any volumes reclassified to non-proved reserves could return to proved reserves as commodity prices improve. Future reserve revisions could also result from changes in capital funding, drilling plans and governmental regulation, among other things.

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Reserve estimation is a subjective process that involves estimating volumes to be recovered from underground accumulations of crude oil and condensate, NGLs, natural gas and bitumen that cannot be directly measured. (Bitumen is mined and then upgraded into synthetic crude oil.) 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 comparable producing areas;
volumes of bitumen in-place and various factors affecting the recoverability of bitumen and its conversion into synthetic crude oil such as historical upgrader performance;
the assumed effects of regulation by governmental agencies;
assumptions concerning future operating costs, severance and excise 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, 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 amounts or other factors estimated:
the amount and timing of production;
the revenues and costs associated with that production; and
the amount and timing of future development expenditures.
The discounted future cash flows from our proved crude oil and condensate, NGLs, natural gas and synthetic crude oil reserves reflected in this Annual Report on Form 10-K should not be considered as the market value of the reserves attributable to our properties. As required by SEC Rule 4-10 of Regulation S-X, the estimated discounted future cash flows from our proved crude oil and condensate, NGLs, natural gas and synthetic crude oil reserves are based on an unweighted average of closing prices for the first day of each month in the 12-month periods ended December 31, 2015, 2014 and 2013, and costs applicable at the date of the estimate, while actual future prices and costs may be materially higher or lower.
In addition, the 10% discount factor required by the applicable rules of the SEC to be used to calculate discounted future cash flows for reporting purposes 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.
If we are unsuccessful in acquiring or finding additional reserves, our future liquid hydrocarbon 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 liquid hydrocarbon 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, natural gas and synthetic crude oil are produced. Accordingly, to the extent we are not successful in replacing the crude oil and condensate, NGLs, natural gas and synthetic crude oil 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, natural gas and synthetic crude oil in promising areas;
drilling success;
the ability to complete long lead-time, capital-intensive projects timely and cost effectively;
the ability to find or acquire additional proved reserves at acceptable costs; and
the ability to fund such activity.

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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 liquid hydrocarbon and natural gas 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;
fires, explosions, blowouts or surface cratering;
lack of access to pipelines or other transportation methods; and
shortages or delays in the availability of services or delivery of equipment.
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;
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 deepwater areas may pose incrementally greater risks because of water depths that limit intervention capability and 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/orand 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 venting or 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.

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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., Canada, 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 proposedfinalized regulations targeting new sources of methane emissions from the oil and gas industry, which are expected to be finalized in 2016.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 synthetic crude oil, 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 including the operation of injection wells, 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. Federal, state and local-level laws or regulations targeting various aspects of the hydraulic fracturing process are being considered, or have been proposed or implemented. For example, the U.S. Congress has considered legislation that would require additional regulation affecting the hydraulic fracturing process, and may be expected to do so in future legislative sessions. Further, variousVarious 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. In addition to such legislative and regulatory proposals, there are also a number of studies and initiatives underway that may lead to additional proposals in the future, such as the EPA research study on the potential effects that hydraulic fracturing may have on water quality and public health. In 2015 the Bureau of Land ManagementBLM issued a rule governing certain hydraulic fracturing practices on lands within their jurisdiction. Whilejurisdiction; however, this rule has been stayed nationwide by court ruling, further findings by the court could resultwas rescinded in additional changes to this new rule.December 2017.
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 recently have focused on a possible connection between the operation of injection wells used for oil and gas waste disposal and seismic activity.  Similar concerns have been raised that hydraulic fracturing may also contribute to seismic activity.  When caused by human activity, such events are called induced seismicity. In a few instances, operators ofSeparate and apart from the referenced potential connection between injection wells in the vicinity of seismic eventsand seismicity, concerns have been orderedraised that hydraulic fracturing activities may be correlated to reduce injection volumes or suspendanomalous seismic events. Marathon uses hydraulic fracturing techniques throughout its U.S. operations. A 2012 report published by

While the National Academy of Sciences concluded that only a very small fraction of the tens of thousands of injection wells have been suspected to be, or have been, the likely cause of induced seismicity;scientific community and a 2015 report by researchers at the University of Texas has suggested that the link between seismic activity and wastewater disposal may vary by region.  Some state regulatory agencies have modified their regulations to account for induced seismicity. 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 recently 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 including recent negligence suits and a RCRA citizen suit in Oklahoma alleging thatdamage from seismicity relating to disposal well operations have caused damage to neighboring propertiesoperations. Marathon has not been named in any of those lawsuits.

Increased seismicity in Oklahoma or otherwise violated state and federal rules regulating waste disposal.  These developmentsother areas could result in additional regulation and restrictions on the use of injection wellsour operations and hydraulic fracturing.  Increasedcould 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 utilizing hydraulic fracturing or injection wells for waste disposal. 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

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fracturing. The adoption of any federal, state or local laws or the implementation of regulations regarding induced seismicity 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.activities.
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 39%38% of our liquid hydrocarboncrude oil and condensate, NGLs and natural gas sales volumes related to continuing operations in 20152017 was derived from production outside the U.S. and 56%30% of our proved reserves of crude oil and condensate, NGLs and natural gas reserves as of December 31, 20152017 were located outside the U.S. All of our synthetic crude oil production and proved reserves are located in Canada. We are, therefore, subject to the political, geographic and economic risks and possible terrorist 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., Ethiopia, Gabon, the Kurdistan Region of Iraq and Libya, and in global markets including:
changes in governmental policies relating to liquid hydrocarboncrude 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.
For the past several years, there have been varying degrees of political instability and public protests, including demonstrations which have been marked by violence and numerous incidences of terrorist acts, within some countries in the Middle East including Bahrain, Egypt, Iraq, Libya, Syria, Tunisia and Yemen.Africa. Some political regimes in these countries are threatened or have changed as a result of such unrest.
If such unrest continues to spread, conflicts could result in civil wars, regional conflicts, and regime changes resulting in governments that are hostile to the U.S. These may have the following results, among others:
volatility in global crude oil prices which could negatively impact the global economy, resulting in slower economic growth rates and reduced demand for our products;
negative impact on the world crude oil supply if transportation avenues are disrupted;
security concerns leading to the prolonged evacuation of our personnel;
damage to, or the inability to access, production facilities or other operating assets; and
inability of our service and equipment providers to deliver items necessary for us to conduct our operations.
Continued hostilities in the Middle East and Africa and 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 and synthetic crude oil.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.

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 level of indebtedness may limit our liquidity and financial flexibility.
OurAs of December 31, 2017, our total debt was $7.3$5.5 billion, as of December 31, 2015.with no debt due within the next 24 months. 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;

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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 and synthetic crude oil 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 1715 to the consolidated financial statements for a discussion of debt obligations.
A downgrade in our credit rating particularly below investment grade, 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 decline in crude oil and U.S. natural gas prices in recent years, credit rating agencies reviewed companies in the energy industry, including us. At December 31, 2017, our corporate credit ratings were: Standard & Poor's Global Ratings Services BBB- (stable); Fitch Ratings BBB (stable); and Moody's Investor Services, Inc. Ba1 (stable). The credit rating process is contingent upon a number of factors, many of which are beyond our control. A downgrade of our credit ratings particularly below investment grade, 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 restrictmay limit or reduce credit lines with our access to the commercial paper market.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 program, 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.
To the extent that we engage in price risk management activitiesGlobal commodity prices are volatile. In order to protect ourselves againstmitigate commodity price declines,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.
Our business could be negatively impacted by cyber-attackscyberattacks targeting our computer and telecommunications systems and infrastructure.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.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 liquid hydrocarbon and natural gas production and distribution systems in the U.S. and abroad, including those systems used to transport production to market.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 cyber-attackscyberattacks 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 systems and related infrastructure security vulnerabilities. We may also be subject to regulatory investigations or litigation relating from cybersecurity issues.
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, and synthetic crude oil, 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.

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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 liquid hydrocarboncrude oil and natural gas properties.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 liquid hydrocarboncrude oil and natural gas reserves (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 liquid hydrocarboncrude oil and condensate, NGLs and natural 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 with partners, 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 or oil sands mining, with partners 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 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 North AmericaUnited States E&P and International E&P 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. Our OSM operations are subject to business interruptions due to breakdown or failure of equipment or processes and unplanned events such as fires, earthquakes, explosions or other interruptions. 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 andincluding 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 certain of our insurance policies have increasedwill change over time and could escalate further.escalate. In some instances, certain insurance could become unavailable

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or available only for reduced amounts of coverage. For example, due to historical hurricane activity, in recent years, the availability of insurance coverage for windstorms has been reduced or,changed and, in manysome instances, it is prohibitively expensive.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, antitrust 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 have filed lawsuits in California and New York 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 six of these lawsuits in California, 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.
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.

33


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 liquid hydrocarboncrude oil and condensate, NGLs and natural gas properties, oil sands mining properties and facilities, and other important physical properties have been described by segment under Item 1. Business.
Estimated net proved crude oil and condensate, NGLs and natural gas and synthetic crude oil reserves are set forth in Item 8. Financial Statements and Supplementary Data – Supplementary Information on Oil and Gas Producing Activities – Estimated Quantities of Proved Oil and Gas Reserves. The basis for estimating these reserves is discussed in Item 1. Business – Reserves.
Item 3. Legal Proceedings
We are a defendant in a number of lawsuitslegal 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 that 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 24 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, 20152017, under federal and state environmental laws. Except
Government entities have filed lawsuits in California and New York 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 described herein, it is not possible to predict accuratelya 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 six of these lawsuits in California, 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 these matters; however, management’s belief set forth in the first paragraph under Legal Proceedings above takes such matters into account.operations or cash flow.
As of December 31, 2015,2017, 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 which is in many cases preliminary and incomplete, we have approximately $4 millionthe accrued amount to address the clean-up and remediation costs connected with these sites.sites is not material.
The projected liability for clean-up and remediation provided in the preceding paragraph is a forward-looking statement. To the extent thatIf our assumptions relating to these costs prove to be inaccurate, future expenditures may differ materially from those stated in the forward-looking statement.exceed our accrued amounts. 
Item 4. Mine Safety Disclosures
Not applicable.

34


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"). As of January 31, 2016,2018, there were 37,60831,472 registered holders of Marathon Oil common stock.
The following table reflects high and low sales prices for Marathon Oil common stock and the related dividend per share by quarter for the past two years:
2015 20142017 2016
(Dollars per share)High Price   Low Price Dividends   High Price   Low Price Dividends  High Price   Low Price Dividends   High Price   Low Price Dividends  
First Quarter$29.63 $25.47 $0.21 $35.52 $31.81 $0.19$18.18 $14.61 $0.05 $12.82 $6.73 $0.05
Second Quarter$31.19 $25.92 $0.21 $40.16 $34.90 $0.19$16.60 $11.35 $0.05 $15.27 $10.53 $0.05
Third Quarter$25.79 $14.04 $0.21 $41.69 $37.59 $0.21$13.73 $10.77 $0.05 $16.80 $12.90 $0.05
Fourth Quarter$20.18 $12.38 $0.05 $37.13 $24.80 $0.21$17.26 $13.48 $0.05 $18.80 $12.78 $0.05
Full Year$31.19 $12.38 $0.68 $41.69 $24.80 $0.80$18.18 $10.77 $0.20 $18.80 $6.73 $0.20
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, 2015,2017, of equity securities that are registered by Marathon Oil pursuant to Section 12 of the Securities Exchange Act of 1934:
 Column (a)  Column (b) Column (c) Column (d)
Period
Total Number of
Shares
Purchased(a)
  
Average
Price Paid
per Share
 
Total Number of
Shares Purchased
as Part of Publicly
Announced Plans
or Programs(c)
 
Approximate
Dollar Value of
Shares that May
Yet Be Purchased
Under the Plans
or Programs(c)
10/01/15 – 10/31/1546,156
  $18.44 
 $1,500,285,529
11/01/15 – 11/30/154,179
  $18.19 
 $1,500,285,529
12/01/15 – 12/31/151,049
(b) 
 $19.18 
 $1,500,285,529
Total51,384
  $18.44 
  
Period
Total Number of
Shares
Purchased(a)
 
Average
Price Paid
per Share
 
Total Number of
Shares Purchased
as Part of Publicly
Announced Plans
or Programs(b)
 
Approximate
Dollar Value of
Shares that May
Yet Be Purchased
Under the Plans
or Programs(b)
10/01/17 – 10/31/1749,046
 $13.38 
 $1,500,285,529
11/01/17 – 11/30/172,813
 $14.62 
 $1,500,285,529
12/01/17 – 12/31/17
 
 
 $1,500,285,529
Total51,859
 $13.45 
  
(a) 
51,38451,859 shares of restricted stock were delivered by employees to Marathon Oil, upon vesting, to satisfy tax withholding requirements.
(b) 
Does not include shares repurchased in open-market transactions to satisfy the requirements for dividend reinvestment under the Marathon Oil Corporation Dividend Reinvestment and Direct Stock Purchase Plan (the “Dividend Reinvestment Plan”) by the administrator of the Dividend Reinvestment Plan. On March 9, 2015, the Dividend Reinvestment Plan was terminated. Participants in the Dividend Reinvestment Plan were transferred to Computershare CIP, a Direct Stock Purchase and Dividend Reinvestment Plan, which is sponsored and administered by Computershare Trust Company, N.A.
(c)
In January 2006, we announced a $2.0 billion share repurchase program. Our Board of Directorsdirectors 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. The remaining share repurchase authorization as of December 31, 20152017 is $1.5 billion. No repurchases were made under the program in 2015.2017.

35


Item 6.   Selected Financial Data
Year Ended December 31,Year Ended December 31,
(In millions, except per share data)2015 2014 2013 2012 20112017 2016 2015 2014 2013
Statement of Income Data(b)(c)
  
        
      
Revenues$5,522
 $10,846
 $11,325
 $11,966
 $11,088
$4,373
 $3,170
 $4,635
 $9,238
 $9,731
Income (loss) from continuing operations(2,204) 969
 931
 856
 467
(830) (2,087) (1,701) 710
 710
Discontinued operations(4,893) (53) (503) 2,336
 1,043
Net income (loss)(2,204) 3,046
 1,753
 1,582
 2,946
(5,723) (2,140) (2,204) 3,046
 1,753
Per Share Data(a)(b)
         
Per Share Data(a)(b)(c)
         
Basic:                  
Income (loss) from continuing operations$(3.26) $1.42
 $1.32
 $1.21
 $0.66
$(0.97) $(2.55) $(2.51) $1.04
 $1.01
Discontinued operations$(5.76) $(0.06) $(0.75) $3.44
 $1.48
Net income (loss)$(3.26) $4.48
 $2.49
 $2.24
 $4.15
$(6.73) $(2.61) $(3.26) $4.48
 $2.49
Diluted:                  
Income (loss) from continuing operations$(3.26) $1.42
 $1.31
 $1.21
 $0.65
$(0.97) $(2.55) $(2.51) $1.04
 $1.00
Discontinued operations$(5.76) $(0.06) $(0.75) $3.42
 $1.47
Net income (loss)$(3.26) $4.46
 $2.47
 $2.23
 $4.13
$(6.73) $(2.61) $(3.26) $4.46
 $2.47
Statement of Cash Flows Data(b)
                  
Additions to property, plant and equipment related to continuing operations$3,476
 $5,160
 $4,443
 $4,361
 $2,767
$(1,974) $(1,204) $(3,485) $(4,937) $(4,170)
Dividends paid460
 543
 508
 480
 567
170
 162
 460
 543
 508
Dividends per share$0.68 $0.80 $0.72 $0.68 $0.80$0.20
 $0.20
 $0.68
 $0.80 $0.72
Balance Sheet Data at December 31(c)
         
Balance Sheet Data at December 31         
Total assets$32,311
 $35,983
 $35,588
 $35,269
 $31,344
$22,012
 $31,094
 $32,311
 $35,983
 $35,588
Total long-term debt, including capitalized leases7,276
 5,295
 6,362
 6,475
 4,647
5,494
 6,581
 7,268
 5,285
 6,352
(a) 
Includes impairments to producing properties of $412$229 million, $67 million, $381 million, $132 million and $96 million $371 million and $310 million in 2017, 2016, 2015, 2014 2013, 2012 and 20112013 and impairments to unproved properties of $964$246 million, $195 million, $655 million, $306 million and $572 million and $227 million in 2017, 2016, 2015, 2014 2013 and 20122013 (see Item 8. Financial Statements and Supplementary Data – Note 1310 to the consolidated financial statements)). Includes a goodwill impairment of $340 million in 2015 related to the N.A.U.S. E&P reporting unit.unit (see Item 8. Financial Statements and Supplementary Data – Note 1412 to the consolidated financial statements).
(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 our Norway business in 2014 (see Item 8. Financial Statements and Supplementary Data – Note 5 to the consolidated financial statements); and our downstream business was spun-off in 2011.. The applicable periods have been recast to reflect these businesses as discontinued operations.
(c) 
Prior year periods were adjustedDecember 31, 2016 includes the increase of a valuation allowance on certain of our deferred tax assets for $1,346 million (see Item 8. Financial Statements and Supplementary Data – Note 9 to reflect debt issuance costs as a direct reduction from the associated debt liability in our consolidated balance sheets with the adoption of the debt issuance costs standard in the fourth quarter of 2015. See Note 2 for information.financial statements).



36




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 segments is organized and managed based upon both geographic location and the nature of the products and services it offers:offers.
North AmericaUnited States E&P – explores for, produces and markets crude oil and condensate, NGLs and natural gas in North America;the United States
International E&P – explores for, produces and markets crude oil and condensate, NGLs and natural gas outside of North Americathe United States and produces and markets products manufactured from natural gas, such as LNG and methanol, in E.G.; and
Oil Sands Mining – mines, extracts and transports bitumen from oil sands deposits in Alberta, Canada, and upgrades the bitumen to produce and market synthetic crude oil and vacuum gas oil.
Executive Summary
We were ableDuring 2017, we continued to increase net sales volumesstrengthen our balance sheet, transform our portfolio and manage our capital and operating costs. Through multiple financing transactions in 2017, we have reduced total debt by 20%approximately $1.75 billion which will result in a reduction to our future annual interest expense of approximately $115 million. Additionally, we closed on the sale of our Canadian business for approximately $2.5 billion and acquired acreage in the three core U.S. resource plays despite a significant reductionPermian basin, including over 70,000 net acres in capital expenditures caused byNorthern Delaware for approximately $1.9 billion.
As discussed in Item 8. Financial Statements and Supplementary Data – Note 5 to the deteriorationconsolidated financial statements, we closed on the sale of our Canadian business, which has been reflected as discontinued operations and is excluded from operations in commodity prices during 2015. Our focus on cost disciplineall periods presented.
Key highlights include the following:
Liquidity and efficiencies yielded sustainable savings in both operating expenses and capital costs. We prioritized capital allocation to our domestic unconventional resource plays and scaled back our conventional exploration program. We continued to progress our program of non-core asset sales and realized aggregate net proceeds of $225 million. We ended 2015corporate financing
Ended 2017 with liquidity of $4.2$4.0 billion, comprised of $1.2 billion of cash and $3.0 billion available through a committed multi-year credit facility. Despite current commodity prices, we believe that we can satisfy operational objectives and capital commitments with the$563 million in cash and cash equivalents and an undrawn $3.4 billion revolving credit facility, which was increased from $3.3 billion in July 2017. Remaining proceeds of $750 million from the sale of our Canadian business are scheduled to be received in the first quarter of 2018.
In third quarter 2017, we issued $1 billion of 4.4% senior unsecured notes due in 2027 and redeemed approximately $1.75 billion of debt due in 2017, 2018 and 2019. This offering and redemption reduced our future annual interest expense by approximately $64 million.
In December 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. This redemption reduced our future annual interest expense by approximately $51 million.
Simplifying our portfolio
We closed on hand, internally generated cash flow from operations, available borrowing capacity, the flexibilitysale of our Canadian business for approximately $2.5 billion with over $1.8 billion in proceeds received to adjust our Capital Programdate and our non-core asset disposition program. Our target for non-core asset dispositions is now $750 million to $1be received in first quarter 2018.
We closed on multiple Permian basin acquisitions for approximately $1.9 billion an increase from our previous goal of $500 million.cash on hand.
Significant 2015 operatingFinancial and financial activities include the following:Operational results
Increased company-wideTotal 2017 net sales volumes from continuing operations are 379 mboed, including Libya, which is 10% higher compared to 2016. This includes a 12% increase in sales volumes from the U.S resource plays to 217 mboed within our United States E&P segment.
Due to improved cost structure and higher sales volumes, our production expense rate in our United States E&P segment decreased 7% to $5.57 per boe in 2017 compared to last year. In our International E&P segment, our production expense rate decreased 14% to $4.33 per boe in 2017 primarily due to an increase in sales volumes in E.G. and Libya.
Added proved reserves of 193 mmboe for a reserve replacement ratio from continuing operations of 140%.
Net cash provided by 6%operating activities in 2017 was $2.0 billion, compared to 438 mboed$901 million in 2016 primarily as a result of improved price realizations, increased sales volumes and lower unit production expenses.



Our net loss per share from 415 mboedcontinuing operations was $0.97 in 2017 as compared to a net loss per share of $2.55 last year. Included in the 2017 net loss are:
NetAn increase in sales volumes from our three U.S. resource playsand other operating revenues of over 40% to $4.2 billion primarily due to improved price realizations and increased 20% to 218 mboed from 181 mboed
Maintained focus on cost discipline and efficiencies
Reduced our 2015 Capital Program by approximately 50% from the prior year, down to $3 billion, reflecting continued capital discipline and benefits from operating efficienciessales volumes.
Reduced company-wideOur sales volumes from continuing operations increased 10% while production expenses per boe in 2015
North America E&P - 28% reduction to $7.38 per boe
International E&P - 28% reduction to $5.99 per boeexpense remained flat during 2017 as a result of improved cost structure.
Rationalized the workforce during 2015,Depreciation, depletion and expectamortization expense increased 10% to generate a future annualized net savings of $160 million$2.4 billion due to our increase in sales volumes from a 20% reduction in workforce
Active management of liquidity and capital structure
At December 31, 2015:
Liquidity of $4.2 billion
Cash-adjusted debt-to-capital ratio was 25%
continuing operations.
Issued $2 billion aggregate principal amountExploration and impairment expenses increased by $248 million to $638 million, year over year, primarily due to non-cash impairment charges on proved and unproved properties primarily as a result of unsecured senior notes, $1 billionthe anticipated sales of which was usedcertain non-core international assets and due to repay the 0.90% senior notes that matured in November 2015lower forecasted long-term commodity prices.
IncreasedOur provision for income taxes was $376 million in 2017 primarily as a result of our full valuation allowance on our net federal deferred tax assets throughout 2017 and the capacityeffects of our foreign operations. See Item 8. Financial Statements and Supplementary Data - Note 7 to the consolidated financial statements for a discussion of the revolving credit facility to $3.0 billion while also extending the maturity date to May 2020
Repatriated Canadian earnings in a tax efficient manner, providing $250 millioneffects of cash available for use in U.S. operations
Reduced the quarterly dividend beginning in the third quarter, from $0.21 per share to $0.05 per shareTax Reform Legislation.
Portfolio management activities
We continue to make progress in our non-core asset divestitures, with a goal of $750 million to $1 billion
Closed on the sale of our East Texas, North Louisiana and Wilburton, Oklahoma natural gas assets in August 2015 for net proceeds of approximately $100 million
Closed on the sale of certain Gulf of Mexico properties in December 2015 for net cash proceeds of $111 million

37


Signed an agreement for the sale of our East Africa exploration acreage in Kenya and Ethiopia; the Kenya transaction closed in February 2016 and Ethiopia is expected to close during the first quarter of 2016.
Financial results
Loss from continuing operations per diluted share of $3.26 in 2015 as compared to income from continuing operations of $1.42 per diluted share in 2014, reflecting the impact of lower commodity prices
Included in the loss for 2015 are $1.4 billion ($1.7 billion pre-tax) of charges comprised largely of losses and asset impairments resulting from lower forecasted commodity prices, goodwill impairment and changes in our conventional exploration strategy (refer to North America E&P - Exploration and International E&P - Exploration in Item 1. Business)
Recorded non-cash deferred tax expense of $135 million in 2015 related to the increase in Alberta's provincial corporate income tax rate
Operating cash flow provided by continuing operations for 2015 was $1.6 billion, compared to $4.7 billion in 2014, reflecting the lower commodity price environment

38


Outlook
Commodity prices are the most significant factor impacting our revenues, profitability, operating cash flows and the amount of capital available to reinvest into our business. Commodity prices began declining in the second half of 2014 and continued through 2015 and into 2016. We believe we can manage in this lower commodity price cycle through operational execution, efficiency improvements, cost reductions, capital discipline and portfolio optimization, while continuing to focus on balance sheet protection.
Capital Development Program
Our Board of Directors approved a$2.3 billion 2018 Capital Development Program of $1.4 billion for 2016. We intend towill be flexible with respectover 90% allocated to our capital allocation decisions in lightU.S. resource plays. Almost 60% of this challenged commodity pricing environment.  With that in mind, we have engaged in an active programdevelopment budget will be allocated to divest of non-corethe high-return Eagle Ford and Bakken assets, which together withhave demonstrated step-change performance improvements while operating at scale. Approximately one-third of the development budget will be allocated to our anticipated cash flows from operations, plusNorthern Delaware and Oklahoma assets, where the savings embedded from the cost reductions we have put in place, should allow usmajority of drilling activity will be transitioning to meet our current Capital Program, operating costs, debt servicemulti-well pads, while continuing strategic delineation and dividends. The discipline undertaken as part of a real-time evaluation of our revenues, expenditures, and asset dispositions should allow us to live within our means.appraisal.
Our 2018 Capital Development Program is broken down by reportable operating segment in the table below:
(In millions)2016 Capital ProgramPercent of Total
North America E&P$1,166
81%
International E&P185
13%
Oil Sands Mining41
3%
Segment total1,392
97%
Corporate and other40
3%
Total Capital Program$1,432
100%
(In millions)Capital Development Program
United States E&P 
   Eagle Ford$710
   Bakken590
   Oklahoma410
   Northern Delaware380
Total United States E&P$2,090
International E&P and corporate other (a)
210
Total Capital Development Program$2,300
North America E&P(a) – Approximately $1.2 billion of our Capital Program is allocated to our three core U.S. resource plays.
Eagle Ford - Approximately $600 million is planned, we expect to average five rigs and bring 124-132 gross-operated wells to sales. Included in Eagle Ford spending is approximately $520 million for drilling and completions. The 2016 drilling program will continue to focus on the co-development of the Lower and Upper Eagle Ford horizons as well as Austin Chalk in the core of the play.
Oklahoma Resource Basins - Spending of approximately $200 million is targeted, we expect to average two rigs which will focus primarily on lease retention in the STACK and delineation of the Meramec, and bring 20-22 gross-operated wells to sales. Spending includes approximately $195 million for drilling and completions, including $55 million for outside-operated activity. We expect to be approximately 70% held by production in the STACK by year end, with SCOOP already 90% held by production.
Bakken - We plan to spend just under $200 million in North Dakota. Drilling activity will average one rig for half of 2016 and bring online 13-15 gross-operated wells. Bakken spending includes approximately $150 million for drilling and completions, including $75 million for outside-operated activity. Facilities and infrastructure spending will be significantly lower than 2015 with the next phase of the water-gathering system scheduled to be complete in the second half of 2016.
International E&P – Approximately $170 million of our Capital Program is dedicated to our international assets, primarily in E.G. and the Kurdistan Region of Iraq. The Alba field compression project in E.G. remains on schedule to start up by mid-year, and will extend plateau production by two years as well as the asset’s life by up to eight years.
Approximately $30 million of our Capital Program will be spent on a targeted exploration program impacting both the North America E&P and thecorporate other includes our International E&P segments. Activity in 2016 is limited to fulfilling existing commitments in the Gulf of Mexicosegment and Gabon, with no operated exploration wells planned.
Oil Sands Mining – We expect to spend $40 million of the Capital Program for sustaining capital projects.other corporate items
The remainder of our Capital Program consists of Corporate and Other and is expected to total approximately $40 million.
For information about expected exploration and development activities more specific to individual assets, see Item 1. Business.
Production Volumes
We forecast 2016 production available for sale from the combined North America E&P and International E&P segments, excluding Libya, to average 335 to 355 net mboed and the OSM segment to average 40 to 50 net mbbld of synthetic crude oil.

39


Acquisitions and Dispositions
Excluded from our Capital Program are the impacts of acquisitions and dispositions not previously announced. We continually evaluate ways to optimize our portfolio through acquisitions and divestitures. In connection with our ongoing portfolio management, future decisions to dispose of assets could result in non-cash impairments in the period such decisions are made.
Operations
Our net sales volumes from continuing operations, including Libya, averaged 438379 mboed, 415345 mboed and 404385 mboed for 2017, 2016 and 2015, 2014 and 2013. As liftings from Libya were sporadic during this 3-year period, a more representative comparison is netrespectively. This 10% increase in 2017 was primarily due to new wells to sales volumes from continuing operations excluding Libya, which was 438 mboed, 408 mboed and 376 mboed for 2015, 2014 and 2013. The continued ramp up of production fromin our U.S. resource plays, has beenour acquisitions in Northern Delaware and the most significant contributorresumption of sales in Libya.
The following table presents a summary of our sales volumes for each of our segments. Refer to the increases when comparing results excluding Libya, partially offset by decreases from domestic asset sales and normal production declines.Results of Operations section for a price-volume analysis for each of the segments.
Net Sales Volumes2015 Increase
(Decrease)
 2014 Increase
(Decrease)
 2013
North America E&P (mboed)
269 13 % 238 18 % 201
International E&P (mboed)
116 (9)% 127 (18)% 155
Oil Sands Mining (mbbld) (a)
53 6 % 50 4 % 48
Total Continuing Operations (mboed)
438 6 % 415 3 % 404
Net Sales Volumes2017 Increase
(Decrease)
 2016 Increase
(Decrease)
 2015
United States E&P (mboed)
234 5% 223 (17)% 269
International E&P (a) (mboed)
145 19% 122 5 % 116
Total Continuing Operations (mboed)
379 10% 345 (10)% 385
(a)     Includes blendstocks.Years ended December 31, 2017, 2016 and 2015 include net sales volumes relating to Libya of 20 mboed, 3 mboed and none, respectively.

North America


United States E&P
The following tables provide additional detail regarding net sales volumes, sales mix and operational drilling activity:activity for our significant operations within this segment:
Net Sales Volumes2015 Increase
(Decrease)
 2014 Increase
(Decrease)
 20132017 Increase
(Decrease)
 2016 Increase
(Decrease)
 2015
Equivalent Barrels (mboed)
 
Oklahoma54 54% 35 40% 25
Eagle Ford134
 20% 112
 38% 81
101 (4)% 105 (22)% 134
Oklahoma Resource Basins25
 39% 18
 29% 14
Bakken59
 16% 51
 31% 39
56 4% 54 (8)% 59
Other North America(a)
51
 (11)% 57
 (15)% 67
Total North America E&P (mboed)
269
 13% 238
 18% 201
Northern Delaware6 100%  —% 
Other United States(a)
17 (41)% 29 (43)% 51
Total United States E&P (mboed)234 5% 223 (17)% 269
(a)Includes 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. Year ended December 31, 2016 decreases relating to assets sold were 23 mboed, primarily consisting of Wyoming, West Texas, East Texas, North Louisiana and certain Gulf of Mexico assets. See Item 8. Financial Statements and other conventional onshore U.S. production, plus Alaska in 2013.Supplementary Data - Note 5 to the consolidated financial statements for information about these dispositions.
Sales Mix - U.S. Resource Plays - 2015Eagle Ford Oklahoma Resource Basins Bakken
Sales Mix - U.S. Resource Plays - 2017 Oklahoma Eagle Ford Bakken Northern Delaware Total
Crude oil and condensate60% 19% 87% 28% 58% 83% 66% 57%
Natural gas liquids19% 28% 7% 26% 21% 10% 8% 19%
Natural gas21% 53% 6% 46% 21% 7% 26% 24%
Drilling Activity - U.S. Resource Plays2015 2014 20132017 2016 2015
Gross Operated      
Eagle Ford:     
Oklahoma: 
Wells drilled to total depth251
 360
 299
86 33 20
Wells brought to sales276
 310
 307
73 28 21
Oklahoma Resource Basins:     
Eagle Ford: 
Wells drilled to total depth21
 19
 10
182 168 251
Wells brought to sales20
 18
 9
157 168 276
Bakken:      
Wells drilled to total depth35
 83
 76
90 3 35
Wells brought to sales56
 69
 77
39 13 56
Northern Delaware 
Wells drilled to total depth27  
Wells brought to sales18  

40Eagle Ford – Our net sales volumes were 101 mboed in 2017, 4% lower compared to 2016. We brought fewer wells to sales in 2017, while we increased well productivity through completion optimization and efficiency gains.


North America E&P segment average
Bakken – Our net sales volumes were 56 mboed in 2017 compared to 54 mboed in 2016. In 2017, we improved well performance with continued application of high intensity completions. During the year, we set a new record in the Williston Basin for the highest 30-day initial production oil rate.
Oklahoma – Our net sales volumes in 20152017 increased 13% whenby 54% to 54 mboed compared to 2014.  Net liquid hydrocarbon sales volumes increased 24 mbbldyear ended 2016. Our activity during 2017 was concentrated in the STACK and net natural gas sales volumes increased 41 mmcfd in 2015 primarily reflecting continued growth from our three core U.S. resource plays.was focused on leasehold capture, delineation drilling and infill spacing pilots.
North America E&P segment average
Northern Delaware – Our net sales volumes were 6 mboed in 2014 increased 18% when compared to 2013, primarily due to higher liquid hydrocarbon net sales volumes resulting from ongoing development programs2017 which reflected a partial year of production following the second quarter 2017 closing of the BC Operating and Black Mountain assets. During 2017 we focused our activity on delineation and leasehold capture across our position in our three key U.S. resource plays. This was partially offset by lower natural gas sales volumes, primarily due to the shut-inEddy and exit from Powder River Basin operations.Lea Counties, New Mexico.
Refer to the Item 1. Business section for additional detail related to net sales volumes by asset.
International E&P
The following table provides net sales volumes from continuing operations:operations within this segment:
Net Sales Volumes2015 Increase
(Decrease)
 2014 Increase
(Decrease)
 20132017 Increase
(Decrease)
 2016 Increase
(Decrease)
 2015
Equivalent Barrels (mboed)
              
Equatorial Guinea97
 (7)% 104
 (3)% 107
109 7% 102 5% 97
United Kingdom(a)
19
 19 % 16
 (20)% 20
14 (18)% 17 (11)% 19
Libya
 (100)% 7
 (75)% 28
20 567% 3 100% 
Other International2 100%  —% 
Total International E&P (mboed)
116
 (9)% 127
 (18)% 155
145 19% 122 5% 116
Net Sales Volumes of Equity Method Investees  

   

  
Equity Method Investees 
  
 
LNG (mtd)
5,884
 (10)% 6,535
  % 6,548
6,423 9% 5,874 —% 5,884
Methanol (mtd)
937
 (14)% 1,092
 (13)% 1,249
1,374 1% 1,358 45% 937
Condensate & LPG (boed)
14,501 8% 13,430 10% 12,208
(a)     Includes natural gas acquired for injection and subsequent resale of 8 mmcfd, 6 mmcfd and 7 mmcfd for 2015, 2014, and 2013.resale.
International E&P segment average net
Equatorial Guinea – Net sales volumes in 2015 decreased 9% when compared to 2014. We did not record any sales from Libya in 20152017 were higher than 2016 as a result of the shutdowncompletion and start-up of our Alba field compression project in mid-2016 and lower volumes in first quarter 2016 due to a planned turnaround. Additionally, in April 2017 we received host government approval to develop Block D offshore E.G. through unitization with the Alba field.
United Kingdom – Net sales volumes in 2017 decreased compared to 2016 primarily as a result of planned turn-around activity at the Brae and Foinaven complexes and the temporary shut-down of the outside-operated Forties Pipeline System during fourth quarter 2017.
Libya – While civil and political unrest has interrupted operations in recent years, our production resumed in October 2016. During December 2016, liftings resumed from the Es Sider crude oil terminalterminal. During 2017, sales volumes and ongoing civil unrest. Sales volumesproduction continued, except for a brief interruption in Equatorial Guinea were lowerMarch 2017 due to a series of turnarounds and other maintenance activities performed at the Alba field, EG LNG and AMPCO facilities during the year. In the U.K., sales volumes increased as we completed the five-well Brae infill drilling program that began in 2014. The Brae Alpha installation experienced a process pipe failure in December 2015. Repairs are underway and full production is expected to resume in the second quarter of 2016.civil unrest.
International E&P segment average net sales volumes in 2014 decreased 18% when compared to 2013. We had lower sales from Libya in 2014 as a result of the shutdown of the Es Sider crude oil terminal which was temporarily re-opened during the second half of 2014. Excluding Libya, net sales volumes decreased 6%, primarily due to reliability issues and production decline in the U.K. and lower reliability at the non-operated methanol facility in E.G.
Refer to the Item 1. Business section for additional detail related to net sales volumes by asset.
Oil Sands Mining
 Our OSM operations consist of a 20% non-operated working interest in the AOSP.  Our net synthetic crude oil sales volumes were 53 mbbld in 2015 compared to 50 mbbld in 2014 and 48 mbbld in 2013.

41


Market Conditions
OilCrude oil, natural gas and gasNGL benchmarks increased in 2017 as compared to the same period in 2016. As a result, we experienced increased price declines during 2015 and into 2016 are reflective of robust supply growth from both OPEC and non-OPEC production around the world. The effect of this supply growth on prices was exacerbated by weakening demand growth in emerging markets and OPEC's formal abandonment of production targets in December 2015. Cruderealizations associated with those benchmarks. We continue to expect crude oil, natural gas and NGLs benchmark prices are likely to remain volatile based on global supply and demand, and declined further subsequent to December 31, 2015 as compared to the average realized priceswhich will result in the tables below.increases or decreases in our price realizations. See Item 1A. Risk Factors and Item 7. Management’s Discussion and Analysis of Financial Condition Cash Flows and Liquidity – Critical Accounting Estimates for further discussion of how a further declinedeclines in commodity prices could impact us. Additional detail on market conditions, including our average price realizations and benchmarks for crude oil, NGLs and natural gas relative to our operating segments, follows.
North America
United States E&P
 The following table presents our average price realizations and the related benchmarks for crude oil, NGLs and natural gas for 2015, 20142017, 2016 and 2013:2015:
 2015 Decrease 2014Decrease 2013 2017 Increase (Decrease) 2016 Increase (Decrease) 2015
Average Price Realizations (a)
                   
Crude Oil and Condensate (per bbl) (b)
 
$43.50
 (49)% 
$85.25
(9)% 94.19
 
$49.35
 28% 
$38.57
 (11)% 43.50
Natural Gas Liquids (per bbl)
 13.37
 (60)% 33.42
(5)% 35.12
 20.55
 56% 13.15
 (2)% 13.37
Total Liquid Hydrocarbons (per bbl)
 37.85
 (51)% 77.02
(10)% 85.20
 42.31
 29% 32.71
 (14)% 37.85
Natural Gas (per mcf)(c)
 2.66
 (42)% 4.57
19 % 3.84
 2.84
 19% 2.38
 (11)% 2.66
Benchmarks   

  

     

   

  
WTI crude oil average of daily prices (per bbl)
 
$48.76
 (48)% 
$92.91
(5)% 98.05
 
$50.85
 17% 
$43.47
 (11)% 48.76
LLS crude oil average of daily prices (per bbl)
 52.33
 (46)% 96.64
(10)% 107.36
 54.04
 20% 45.02
 (14)% 52.33
Mont Belvieu NGLs (per bbl) (c)(d)
 16.94
 (48)% 32.52
(4)% 33.78
 23.76
 37% 17.40
 3 % 16.94
Henry Hub natural gas settlement date average (per mmbtu)
 2.66
 (40)% 4.42
21 % 3.65
 3.11
 26% 2.46
 (8)% 2.66
(a) 
Excludes gains or losses on commodity derivative instruments.
(b) 
Inclusion of realized gains (losses) on crude oil derivative instruments would have increased (decreased) average liquid hydrocarbon price realizations per barrel by $0.75, $0.92, and $1.24 for 2017, 2016, and $(0.27) for 2015 and 2013. There were no crude oil derivative instruments for 2014.2015.
(c)
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 – Our crude oil and condensate price realizations may differ from the benchmark due to the quality and location of the product.
Natural gas liquids – The majority of our NGLs volumes are sold at reference to Mont Belvieu prices.
Natural gas A significant portion of our natural gas production in the U.S. is sold at bid-week prices, or first-of-month indices relative to our specific producing areas.  
International E&P
The following table presents our average price realizations and the related benchmark for crude oil for 2015, 20142017, 2016 and 2013:2015:
 2015 Decrease 2014 Decrease 2013 2017 Increase (Decrease) 2016 (Decrease) 2015
Average Price Realizations                    
Crude Oil and Condensate (per bbl)
 
$47.50
 (46)% 
$87.23
 (19)% 
$108.18
 
$53.05
 27% 
$41.70
 (12)% 
$47.50
Natural Gas Liquids (per bbl)
 2.81
 14 % 2.46
 (53)% 5.24
 3.15
 49% 2.11
 (25)% 2.81
Total Liquid Hydrocarbons (per bbl)
 36.67
 (47)% 68.98
 (24)% 91.04
 43.36
 35% 32.10
 (12)% 36.67
Natural Gas (per mcf)
 0.68
 (6)% 0.72
 (37)% 1.15
 0.55
 6% 0.52
 (24)% 0.68
Benchmark   

   

     

   

  
Brent (Europe) crude oil (per bbl)(a)
 
$52.35
 (47)% 
$99.02
 (9)% 
$108.64
 
$54.25
 25% 
$43.55
 (17)% 
$52.35
(a) 
Average of monthly prices obtained from EIAthe United States Energy Information Agency website.

Our U.K. liquid hydrocarbon production is generally sold in relation to the Brent crude benchmark. Our production from the Alba field in E.G. is condensate and gas. Condensate is sold at market prices.prices and the gas is shipped to the onshore Alba Plant. The Alba Plant extracts NGLs and secondary condensate, from gas,which have been supplied under a long-term contract at a fixed price, leaving dry natural gas. The processedextracted NGLs and secondary condensate are sold by Alba Plant at market prices, with our share of its income/loss reflected in Incomeincome from equity method investments. Theinvestments, and the dry natural gas from Alba Plant is supplied to AMPCO and EGHoldings under long-term contracts at fixed prices; therefore,prices. Therefore, our reported average realized prices for condensate, NGLs and natural gas will not fully track market price movements. Because of the location and limited local demand for natural gas in E.G., we consider the prices under the contracts with Alba Plant LLC, EGHoldings and AMPCO to be comparable to the price that could be realized from transactions with unrelated parties in this market under the same or similar circumstances. EGHoldings and AMPCO process the gas into LNG and methanol, which are sold at market prices, with our share of their income/loss reflected

42


in the Incomeincome from equity method investments line item on the Consolidated Statements of Income. Although uncommon, any dry gas not sold is returned offshore and re-injected into the Alba field for later production.
Oil Sands Mining
 The Oil Sands Mining segment produces and sells various qualities of synthetic crude oil. Output mix can be impacted by operational reliability or planned unit outages at the mines or upgrader. Sales prices for synthetic crude oil historically tracked movements in the WTI crude oil and the WCS Canadian heavy crude oil benchmarks. The influence of each benchmark can change from period to period based on market dynamics.
The following table presents our average price realizations and the related benchmarks that impacted both our revenues and variable costs for 2015, 2014 and 2013:
  2015 Increase
(Decrease)
 2014 Increase
(Decrease)
 2013
Average Price Realizations          
Synthetic Crude Oil (per bbl)
 
$40.13
 (52%) 
$83.35
 (5%) 
$87.51
Benchmark   

   

  
WTI crude oil (per bbl)
 
$48.76
 (48%) 
$92.91
 (5%) 
$98.05
WCS crude oil (per bbl)(a)
 35.28
 (52%) 73.60
 1% 72.77
(a)
Average of monthly prices based upon average WTI adjusted for differentials unique to western Canada.


Consolidated Results of Operations: 20152017 compared to 20142016
Sales and other operating revenues, including related partyare summarized by segment in the following table:
 Year Ended December 31,
(In millions)20172016
Sales and other operating revenues, including related party  
United States E&P$3,138
$2,375
International E&P1,154
665
Segment sales and other operating revenues, including related party4,292
3,040
Unrealized gain (loss) on commodity derivative instruments(81)(110)
Sales and other operating revenues, including related party$4,211
$2,930

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, Increase (Decrease) Related to Year Ended December 31,
(In millions) 2016 Price Realizations Net Sales Volumes 2017
United States E&P Price-Volume Analysis (a)
Liquid hydrocarbons $2,041
 $619
 $66
 $2,726
Natural gas 274
 58
 29
 361
Realized gain on commodity        
    derivative instruments 44
 

   45
Other sales 16
     6
Total $2,375
     $3,138
International E&P Price-Volume Analysis
Liquid hydrocarbons $546
 $264
 $205
 $1,015
Natural gas 87
 4
 6
 97
Other sales 32
     42
Total $665
     $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.
Marketing revenues decreased $78 million in 2017 from 2016, primarily as a result of lower marketed volumes in the United States E&P 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 assetsdecreased $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 11 to the consolidated financial statements for detail about our asset retirement obligation.
Production expensesremained nearly flat during 2017 while our sales volumes from continuing operations increased. During 2017, our production expense rate (expense per boe) for United States E&P was lower primarily due to the disposition of higher cost non-core assets in Wyoming. The International E&P 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)20172016
Production Expense Rate  
United States E&P
$5.57

$5.96
International E&P
$4.33

$5.05
Marketing expenses decreased $77 million in 2017 from the prior year, consistent with the decrease in marketing revenues discussed above.
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 during 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 E&P segment. In 2017, we recorded non-cash charges of $159 million comprised of $95 million in unproved property impairments in our International E&P segment and $64 million in 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:
 Year Ended December 31,
(In millions)20172016
Exploration Expenses  
Unproved property impairments$246
$195
Dry well costs77
25
Geological and geophysical25
5
Other61
98
Total exploration expenses$409
$323
Exploration expenses are also discussed in Item 8. Financial Statements and Supplementary Data - Note 10 to the consolidated financial statements.
Depreciation, depletion and amortizationincreased $216 million in 2017 from the prior year primarily as a result of an increase of $176 million in the United States E&P 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 $52 million in our International E&P segment resulting from increased sales volumes due to the completion and start-up of our E.G. Alba field compression project in mid-2016, and the resumption of sales volumes and production in Libya. Our segments apply the units-of-production method to the majority of their assets, including capitalized asset retirement costs; therefore, volumes have an impact on DD&A expense.
The DD&A rate (expense per boe), which is impacted by field-level changes in sales volumes, reserves and capitalized costs, can also cause changes to our DD&A. The DD&A rate for United States E&P increased primarily due to the sales volume mix between our U.S. resource plays, and the outside-operated Gunflint field achieving first production in mid-2016. Also contributing to the increase was a reduction to the Eagle Ford proved developed reserve base in the fourth quarter of 2016. The DD&A rate for International E&P remained relatively consistent with the 2016 rate. The following table provides DD&A rates for each segment.
($ per boe)20172016
DD&A rate  
United States E&P
$23.51

$22.49
International E&P
$6.19

$6.21
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 E&P 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 10 to the consolidated financial statement for additional detail.
Taxes other than incomeincludes 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:
 Year Ended December 31,
(In millions)20172016
Taxes other than income  
Production and severance$121
$91
Ad valorem13
23
Other49
37
Total$183
$151
General and administrative expenses decreased$81 million in 2017 primarily due to reduced pension settlement charges of $32 million in 2017 compared to $103 million in 2016.
Net interest and otherdecreased $62 million during 2017 primarily as a result of the termination of our forward starting interest rate swaps, which resulted in a gain of $47 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 15 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 approximately $1.75 billion in senior unsecured notes. See Item 8. Financial Statements and Supplementary Data - Note 15 to the consolidated financial statements for further detail.
Provision (benefit) for income taxesreflects 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 7 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: 2017 compared to 2016
Segment income(loss)
Segment income (loss) represents income (loss) from operations excluding certain items not allocated to segments, net of income taxes, attributable to the operating segments. A portion of our corporate and operations support general and administrative 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 that affect comparability also are not allocated to operating segments.
The following table reconciles segment income (loss) to net income (loss):
 Year Ended December 31,
(In millions)2017 2016
United States E&P$(148) $(415)
International E&P374
 228
Segment income (loss)226
 (187)
Items not allocated to segments, net of income taxes (a)
(1,056) (1,900)
    Income (loss) from continuing operations(830) (2,087)
    Income (loss) from discontinued operations (b)
(4,893) (53)
         Net income (loss)$(5,723) $(2,140)
(a) See Item 8. Financial Statements and Supplementary Data - Note 6 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 E&P 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 E&P segment incomeincreased $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.

Consolidated Results of Operations: 2016 compared to 2015
Sales and other operating revenues, including related party are summarized by segment in the following table:
 Year Ended December 31,
(In millions)20162015
Sales and other operating revenues, including related party  
United States E&P$2,375
$3,358
International E&P665
728
Segment sales and other operating revenues, including related party3,040
4,086
Unrealized gain on crude oil derivative instruments(110)50
Sales and other operating revenues, including related party$2,930
$4,136
 Year Ended December 31,
(In millions)20152014
Sales and other operating revenues, including related party  
North America E&P$3,358
$5,770
International E&P728
1,410
Oil Sands Mining815
1,556
Segment sales and other operating revenues, including related party4,901
8,736
Unrealized gain on crude oil derivative instruments50

Sales and other operating revenues, including related party$4,951
$8,736

43


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, Increase (Decrease) Related to Year Ended December 31, Year Ended December 31, Increase (Decrease) Related to Year Ended December 31,
(In millions) 2014 Price Realizations Net Sales Volumes 2015 2015 Price Realizations Net Sales Volumes 2016
North America E&P Price-Volume Analysis
United States E&P Price-Volume AnalysisUnited States E&P Price-Volume Analysis
Liquid hydrocarbons $5,240
 $(3,006) $671
 $2,905
 $2,905
 $(321) $(543) $2,041
Natural gas 516
 (243) 68
 341
 341
 (32) (35) 274
Realized gain on crude oil                
derivative instruments 
 78
   78
 78
 

   44
Other sales 14
     34
 34
     16
Total $5,770
     $3,358
 $3,358
     $2,375
International E&P Price-Volume Analysis
Liquid hydrocarbons $1,240
 $(509) $(153) $578
 $578
 $(78) $46
 $546
Natural gas 124
 (8) (8) 108
 108
 (25) 4
 87
Other sales 46
     42
 42
     32
Total $1,410
     $728
 $728
     $665
Oil Sands Mining Price-Volume Analysis
Synthetic crude oil $1,525
 $(842) $98
 $781
Other sales 31
     34
Total $1,556
     $815
Marketing revenues decreased $1,539$259 million in 20152016 from 2014.2015. 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. The decreases are primarily related to the lower commodity price environment as well as lower marketed volumes in North America.the United States, which were further compounded by a lower commodity price environment.
Income from equity method investmentsdecreased $279 increased $30 million primarily due to lower price realizations for LPG at our Alba Plant, LNG at our LNG facility and lower methanol prices at our AMPCO methanol facility, allhigher net sales volumes in the second half of which are located2016 in E.G. Also contributing toas a result of the decrease were lower sales volumes due to planned turnaround and maintenance activities at the AMPCO methanol plant,completion of the Alba field andcompression project. Additionally, a partial impairment of our investment in an equity method investee in 2015 of $12 million contributed to the LNG facility.increase in the current year.
Net gain on disposal of assets increased $269 million in 2015 was related to the sale of our operated producing properties in the greater Ewing Bank area and non-operated producing interests in the Petronius field in the Gulf of Mexico. The gain associated with those assets was partially offset by the loss on sale of East Africa exploration acreage in Ethiopia and Kenya. The net loss on disposal of assets in 2014 was primarily related to the sale of non-core acreage located in the far northwest portion of the Williston Basin.2016 from 2015. See Item 8. Financial Statements and Supplementary Data - Note 5 to the consolidated financial statements for information about these dispositions.
Production expenses decreased $552$267 million in 20152016 from 2014. Our focus on cost discipline and efficiencies yielded sustainable savings in production costs. North America2015. United States E&P declined $167$238 million primarily due to lower operational, maintenance and labor costs.costs, coupled with lower net sales volumes resulting from the impact of our non-core asset dispositions and lower activity levels. International E&P declined $131$29 million largely due to lower project work, repair,operational and maintenance and turnaround costs as well as lower production volumes. OSM declined $254 million primarily due to cost management, especially staffing and contract labor, lower fuel and utility costs, and lower feedstock purchases given the increased mine and upgrader reliability, combined with a more favorable exchange rate on expenses denominated in the Canadian dollar.expenses.
The 2016 production expense rate (expense rate per boe) decreased for each of our segments as total production costsUnited States E&P declined primarily due to reasons describedcost reductions that occurred at a rate faster than our production decline. The International E&P expense rate decreased in 2016 primarily due to reduced maintenance and project costs in the preceding paragraph. The North America E&PU.K. and OSM segments also experienced volume increases, which further contributed tobenefited from the expense rate decline.favorable exchange rate. The following table provides production expense rates for each segment:

44


($ per boe)2015201420162015
North America E&P
$7.38

$10.25
Production Expense Rate 
United States E&P
$5.96

$7.38
International E&P
$5.99

$8.31

$5.05

$5.99
Oil Sands Mining (a)

$36.48

$44.53
(a)
Production expense per synthetic crude oil barrel (before royalties) includes production costs, shipping and handling, taxes other than income and insurance costs and excludes pre-development costs.
Marketing expenses decreased $1,536$255 million in 20152016 from the prior year, consistent with the decrease in marketing revenues discussed above.
Other operating expenses increased $74 million primarily as a result of the termination payment of our Gulf of Mexico deepwater drilling commitment.
 Exploration expenses increaseddecreased $525648 million in 2016 compared to 2015, primarily duereflecting our strategic decision to highertransition out of conventional exploration. In 2016, unproved property impairments in North America. During 2015, we made a strategicprimarily consisted of non-cash charges related to our decision to reducenot drill our remaining Gulf of Mexico leases and also included certain other unproved properties in the overall level ofUnited States. In 2015, unproved property impairments are due to changes in our conventional exploration program; as a result, we impaired our Canadian in-situ assets, certain of our leases in the Gulfstrategy (Gulf of Mexico and the Harir block in the Kurdistan Region of Iraq. We also impairedIraq), and the sale of certain properties in the Gulf of Mexico, as well as our unproved property in Colorado in 2015, which we deemed uneconomic given our forecasted natural gas prices.Colorado.
Unproved property impairments in 2014 primarily were a result of Eagle Ford and Bakken leases that either expired or we decided not to drill or extend.
Dry well costs forin 2015 includeincluded the operated Solomon exploration well in the Gulf of Mexico and our operated Sodalita West #1 exploratory well in E.G., and suspended well costs related to our Canadian in-situ assets at Birchwood. Dry well costs in 2014 also included our operated Sodalita West #1 exploratory well in E.G. which was drilling over year-end 2014, the operated Key Largo well, outside-operated Perseus well and the outside operated second Shenandoah appraisal well, all of which are located in the Gulf of Mexico. In addition, 2014 also includes our exploration programs in the Kurdistan Region of Iraq, Ethiopia and Kenya.
The following table summarizes the components of exploration expenses:
Year Ended December 31,Year Ended December 31,
(In millions)2015201420162015
Exploration Expenses 
Unproved property impairments$964
$306
$195
$655
Dry well costs250
317
25
212
Geological and geophysical31
85
5
31
Other73
85
98
73
Total exploration expenses$1,318
$793
$323
$971
Exploration expense are also discussed in Item 8. Financial Statements and Supplementary Data - Note 1310 to the consolidated financial statements.
Depreciation, depletion and amortizationincreased $96 decreased $565 million in 20152016 from the prior year primarily as a result of higher North Americanet sales volume decreases in the United States E&P net sales volumes from our three U.S. resource plays.segment, including the impact of non-core asset dispositions, and volume declines due to base declines and lower completion activity. Our segments apply the units-of-production method to the majority of their assets, including capitalized asset retirement costs; therefore, proved reserve and production volumes have an impact on DD&A expense.
The DD&A rate (expense rate per boe), which is impacted by field-level changes in provedsales volumes, reserves and capitalized costs, and sales volume mix by field, can also cause changes to our DD&A. The following table provides DD&A rates for each segment. The DD&A rate for North AmericaUnited States E&P decreased primarily as a result ofdue to a higher proved reserve base in the Eagle Ford.base. The DD&A rate for International E&P rate increaseddeclined primarily due to higher sales volumes fromvolume mix changes in E.G. and the Brae infill drilling program.
U.K. for 2016.
($ per boe)2015201420162015
North America E&P
$24.24

$26.95
DD&A rate 
United States E&P
$22.49

$24.24
International E&P
$6.95

$5.79

$6.21

$6.95
Oil Sands Mining
$12.48

$12.07
 Impairments fordecreased $654 million in 2016 versus 2015. Impairments in 2016 were primarily the result of lower forecasted commodity prices in conventional properties in Oklahoma and the Gulf of Mexico, and were also the result of revisions to estimated abandonment costs. Impairments in 2015 included $340 million for the goodwill impairment of the North AmericaUnited States E&P reporting unit, and $335 million related to proved properties (primarily in Colorado and the Gulf of Mexico) as a result of lower forecasted commodity prices, and $44 million associated with our disposition of natural gas assets in East Texas, North Louisiana and Wilburton, Oklahoma. Impairments for 2014 consisted primarily of proved properties in the Gulf of Mexico, Texas and North Dakota as a result of revisions to estimated abandonment costs and lower forecasted commodity prices.
See Item 8. Financial Statements and Supplementary Data - Note 1310 and Note 1412 to the consolidated financial statement for additional detail. 

Taxes other than income includeincludes production, severance and ad valorem taxes, primarily in the U.S., which tend to increase or decrease in relation to revenue and sales volumes. With the decreaseThe decline in North America E&P revenues due to lower price

45


realizations, taxes other than income decreased $172 million in 2015. This decrease was partially offset by an increase inrevenue and sales volumes during 2016 resulted in North America E&P.a decline of $65 million compared to 2015. The following table summarizes the components of taxes other than income:
Year Ended December 31,Year Ended December 31,
(In millions)2015201420162015
Taxes other than income 
Production and severance$131
$240
$91
$131
Ad valorem39
74
23
39
Other64
92
37
46
Total$234
$406
Total taxes other than income$151
$216
General and administrative expensesdecreased $64107 million primarily due to cost savings realized from the 2015 workforce reductions that occurred during 2015. This decrease was partially offset byincluding corresponding severance expenses of $55 million associated with the workforce reductions and an increase in pension settlement expense. Pension settlement expenses in 2015 totaled $119 million as compared to $99 million in 2014.expenses.
Net interest and otherincreased $29$46 million primarily due to increased interest expense associated with an increase in interest expense as a result of the increase in long-term debt.debt in the second quarter of 2015. The components of net interest and other are detailed in Item 8. Financial Statements and Supplementary Data - Note 820 to the consolidated financial statements.
Provision (benefit) for income taxes reflects an effective tax rate of (25%)79% and 29%a benefit of 30% for each2016 and 2015. The increase in the 2016 effective tax rate was primarily due to the valuation allowance increase of 2015$1,346 million related to our U.S. benefits on foreign taxes and 2014. other federal deferred taxes.
See Item 8. Financial Statements and Supplementary Data - Note 97 to the consolidated financial statements for a discussion of the effective income tax rate.
Discontinued operationsis are presented net of tax. We closed the sale of our Angola assets and Norway business in 2014, and both are reflected as discontinued operations for 2014. Included in the discontinued operations for 2014 are after-tax gains of $532 million and $976 million related to the dispositions of Angola and Norway respectively. See Item 8. Financial Statements and Supplementary Data - Note 5 to the consolidated financial statements.
Segment Results: 2015 compared to 2014
Segment income(loss) for 2015 and 2014 is summarized and reconciled to net income (loss) in the following table.
 Year Ended December 31,
(In millions)2015 2014
North America E&P$(486) $693
International E&P112
 568
Oil Sands Mining(113) 235
Segment income (loss)(487) 1,496
Items not allocated to segments, net of income taxes(1,717) (527)
Income (loss) from continuing operations(2,204) 969
Discontinued operations
 2,077
Net income (loss)$(2,204) $3,046
 North America E&P segment income (loss)decreased $1,179 million in 2015 compared to 2014. The decrease was primarily due to lower price realizations, which was partially offset by the impacts from the increased net sales volumes from the three U.S resource plays and lower production costs (even though net sales volumes increased).
International E&P segment incomedecreased $456 million in 2015 compared to 2014. The decrease was largely due to lower liquid hydrocarbon price realizations as well as reduced income from equity investments. These declines were partially offset by lower production, operating and exploration expenses.
 Oil Sands Mining segment income (loss)decreased $348 million in 2015 compared to 2014 primarily as result of lower price realizations, partially offset by higher sales volumes and reduced production expenses.

46


Consolidated Results of Operations: 2014 compared to 2013
Sales and other operating revenues, including related partyare summarized by segment in the following table:
 Year Ended December 31,
(In millions)20142013
Sales and other operating revenues, including related party  
North America E&P$5,770
$5,068
International E&P1,410
2,654
Oil Sands Mining1,556
1,576
Segment sales and other operating revenues, including related party8,736
9,298
Unrealized gain (loss) on crude oil derivative instruments
(52)
Sales and other operating revenues, including related party$8,736
$9,246
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 and average price realizations.
  Year Ended December 31, Increase (Decrease) Related to Year Ended December 31,
(In millions) 2013 Price Realizations Net Sales Volumes 2014
North America E&P Price-Volume Analysis
Liquid hydrocarbons $4,638
 $(557) $1,159
 $5,240
Natural gas 437
 82
 (3) 516
Realized gain on crude oil        
    derivative instruments (15) 15
   
Other sales 8
     14
Total $5,068
     $5,770
International E&P Price-Volume Analysis
Liquid hydrocarbons $2,398
 $(397) $(761) $1,240
Natural gas 209
 (74) (11) 124
Other sales 47
     46
Total $2,654
     $1,410
Oil Sands Mining Price-Volume Analysis
Synthetic crude oil $1,542
 $(76) $59
 $1,525
Other sales 34
     31
Total $1,576
     $1,556
Marketing revenues increased $31 million in 2014 from 2013. 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. The increase in 2014 is primarily due to higher marketing activity levels in both the North America E&P and OSM segments.
Net loss on disposal of assetsin 2014 primarily includes the pretax loss on the sale of non-core acreage located in the far northwest portion of the Williston Basin. The net loss on disposal of assets in 2013 primarily included pretax losses on the sale of our DJ Basin interests and the conveyance of our Marcellus interests to the operator, partially offset by pretax gains on the sales of the Neptune gas plant and our remaining assets in Alaska. See Item 8. Financial Statements and Supplementary Data - Note 5 to the consolidated financial statements for further details about these dispositions.financial information concerning our discontinued operations.
Segment Results: 2016 compared to 2015
Production expensesSegment income (loss)increased $90 million in 2014
Segment income (loss) represents income (loss) from 2013 primarily relatedoperations excluding certain items not allocated to increased North America E&Psegments, net sales volumes in the Eagle Ford and Bakken. The production expense rate (expense per boe) decreased in North America E&P in 2014 compared to 2013 primarily due to improved operating efficiencies in the Eagle Ford. The expense per boe increased in the International E&P segment due to a subsea power project at our non-operated Foinaven field as well as a turnaround in Brae in the U.K. and a non-recurring riser repair in E.G.

47


The following table provides production expense rates for each segment:
($ per boe)20142013
North America E&P
$10.25

$10.86
International E&P
$8.31

$6.36
Oil Sands Mining (a)

$44.53

$46.30
(a)Production expense per synthetic crude oil barrel (before royalties) includes production costs, shipping and handling, taxes other than income and insurance costs and excludes pre-development costs.
Other operating expenses increased $73 million in 2014 from the prior year, primarily due to increased shipping and handling costs in North America in line with increased sales volumes, as well as the impact of a settlement relatedincome taxes, attributable to the calculationoperating segments. A portion of the net profits interest payments associated with our Alba Plant equity interests in E.G.
Marketing expenses increased $29 million in 2014 from the prior year, consistent with the decreases in marketing revenues discussed above.
Exploration expenses were $98 million lower in 2014 than in 2013, primarily related to our North America E&P segment as a result of larger non-cash unproved property impairments during 2013 related to Eagle Ford leases that either expired or that we didcorporate and operations support general and administrative costs are not expect to drill. These decreases were partially offset by increases in 2014 expenses relatedallocated to the operated Key Largo, the outside-operated Perseus, the outside-operated second Shenandoah appraisal well in the Gulf of Mexico and our operated Sodalita West #1 exploratory well in E.G.operating segments. Gains or losses on dispositions, certain impairments, unrealized gains or losses on commodity derivative instruments, pension settlement losses, or other items that affect comparability also are not allocated to operating segments
The following table summarizes the components of exploration expenses:reconciles segment income (loss) to net income (loss):
 Year Ended December 31,
(In millions)2016 2015
United States E&P$(415) $(452)
International E&P228
 112
Segment income (loss)(187) (340)
Items not allocated to segments, net of income taxes (a) 
(1,900) (1,361)
    Income (loss) from continuing operations(2,087) (1,701)
    Income (loss) from discontinued operations (b)
(53) (503)
         Net income (loss)$(2,140) $(2,204)
 Year Ended December 31,
(In millions)20142013
Unproved property impairments$306
$572
Dry well costs317
148
Geological and geophysical85
80
Other85
91
Total exploration expenses$793
$891
Exploration expense are also discussed in Item 8. Financial Statements and Supplementary Data - Note 13 to the consolidated financial statements.
Depreciation, depletion and amortization(a) increased $361 million in 2014 from the prior year. Our segments apply the units-of-production method to the majority of their assets, including capitalized asset retirement costs; therefore, proved reserve and production volumes have an impact on DD&A expense. Increased DD&A expense in 2014 is primarily due to higher North America E&P sales volumes as a result of ongoing development programs over our three U.S. resource plays.
The DD&A rate, which is impacted by changes in reserves, capitalized costs and sales volume mix by field, can also cause changes to our DD&A. The following table provides DD&A rates for each segment:
($ per boe)20142013
North America E&P
$26.95

$26.23
International E&P
$5.79

$5.86
Oil Sands Mining
$12.07

$12.39
Impairments for 2014 consisted primarily of proved properties in the Gulf of Mexico, Texas and North Dakota as a result of revisions to estimated abandonment costs and lower forecasted commodity prices. Impairments in 2013 primarily related to a second LNG production train in E.G., the Ozona development in the Gulf of Mexico and our Powder River asset in Wyoming. See Item 8. Financial Statements and Supplementary Data - Note 136 to the consolidated financial statements for informationfurther detail about these impairments.items not allocated to segments.

48


Taxes other than income(b)include production, severance and ad valorem taxes, primarily We sold our Canadian business in the U.S., which tend to increase or decrease in relation to revenues and sales volumes. Taxes other than income increased $61 million in 2014 from 2013, consistent with similar increases in the North America E&P Segment.
 Year Ended December 31,
(In millions)20142013
Production and severance$240
$202
Ad valorem74
61
Other92
82
Total$406
$345
Net interest and other decreased $40 million in 2014 from 2013 primarily due to an increase in capitalized interest, higher net foreign currency gains and a dividend received in 2014 from a mutual insurance companysecond quarter of which we are an owner. See Item 8. Financial Statements and Supplementary Data - Note 8 to the consolidated financial statements for more detailed information.
Provision for income taxesreflects an effective tax rate of 29% and 61% for each of 2014 and 2013. See Item 8. Financial Statements and Supplementary Data - Note 9 to the consolidated financial statements for a discussion of the effective income tax rate.
Discontinued operations2017. The Canadian business is presented net of tax. We closed the sale of our Angola assets and our Norway business in 2014, and both are reflected as discontinued operations and excluded from the Internationalin all periods presented.
 United States E&P segment loss decreased $37 million in 2014 and 2013. Included in discontinued operations for 2014 are after-tax gains of $532 million and $976 million related to the dispositions of Angola and Norway, respectively. See Item 8. Financial Statements and Supplementary Data – Note 5 to the consolidated financial statements.
Segment Results: 20142016 compared to 2013
Segment2015 as a result of lower DD&A expense, production costs, taxes other than income, for 2014 and 2013 is summarizedexploration expense, with these expense reductions more than offsetting the lower revenues as a result of decreases in both price realizations and reconciled to net income in the following table.
 Year Ended December 31,
(In millions)2014 2013
North America E&P$693
 $529
International E&P568
 758
Oil Sands Mining235
 206
Segment income1,496
 1,493
Items not allocated to segments, net of income taxes(527) (562)
Income from continuing operations969
 931
    Discontinued operations2,077
 822
Net income$3,046
 $1,753
 North America E&P segment incomeincreased $164 million in 2014 compared to 2013. The increase was largely due to increased liquid hydrocarbon net sales volumes primarily in the Eagle Ford, Bakken and Oklahoma Resource Basins and lower exploration expenses, partially offset by lower average price realizations.volumes.
 International E&P segment incomedecreased $190 million increased $116 million in 20142016 compared to 2013.2015. The decreaseincrease was primarilylargely due to lower liquid hydrocarbon netexploration expenses in 2016, as our 2015 expense included costs relating to our transition out of our conventional exploration program. The remainder of the increase was due to lower production costs and DD&A as a result of lower asset retirement costs and sales volumesmix, and lower average price realizationsan increase in income from equity method investments, partially offset by a decrease in the taxes related to Libya, a high tax jurisdiction. Also, other operating expenses were higher in 2014 primarily due to the impact of a settlement related to the calculation of the net profits interest payments associated with our Alba Plant equity interests in E.G.lower price realizations.
 Oil Sands Mining segment incomeincreased $29 million in 2014 compared to 2013. This increase was primarily a result of higher operating expenses in 2013 related to a turnaround.

49


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. The substantial declineIn 2017, we experienced an increase in commodity prices that beganoperating cash flows primarily due to improvements in the second half of 2014 and continued into 2016 adversely affected our cash flows. In response to the lower commodity price environment actions undertakenwhich resulted in an increase to protectconsolidated average liquid hydrocarbons price realizations by over 30% to $42.59. Additionally, we closed on the sale of our liquidityCanadian business and capital structure include:other non-core assets resulting in net proceeds of $1.79 billion, which allowed us to be opportunistic with our high quality acquisitions in the Permian basin. Beyond the proceeds the non-core asset sales generated, the portfolio changes enhanced our profitability by disposing of higher unit cost operations and allowing for a more efficient allocation of our Capital Development Program to the higher return opportunities in the U.S. resource plays.
DecreasedSteps taken in 2017 to continue our quarterly dividend from $0.21 to $0.05 per share, saving $425 million ofoperating cash on an annualized basis
Scaled back our conventional exploration program to focus on our U.S. unconventional resources plays
Reduced cash capital expenditures to $3.476 billion, a 33% decrease compared to 2014
Announced a 2016 Capital Program of $1.4 billionflow growth include the following actions:
Improved cost structure by reducing North America and production expense per boe in 2017.
United States E&P - 7% reduction to $5.57 per boe
International E&P production expenses 24% versus 2014- 14% reduction to $4.33 per boe
Total 2017 net sales volumes from continuing operations increased 10% compared to 2016.
Other 2017 cash flow highlights include:
Divested certain non-core assets resulting in net proceeds of $1.79 billion.
We closed on multiple Permian basin acquisitions for $1.89 billion with cash on hand.
Through multiple financing transactions we have reduced total debt by approximately $1.75 billion which will result in a reduction to our future annual interest expense of approximately $115 million.
Expect future G&A costs to be lowerreceive $750 million in remaining proceeds from the sale of our Canadian business by $160 million on an annualized basis as a result of 2015 workforce reductionsMarch 1, 2018.
Issued $2 billion aggregate principal amount of unsecured senior notes, $1 billion of which was used to repay the 0.90% senior notes that matured in November 2015
IncreasedExpanded the capacity of the revolving credit facility from $2.5$3.3 billion to $3.0 billion while also extending the maturity date an additional year to May 2020
Repatriated Canadian earnings in a tax efficient manner, providing $250 million of cash available for use in U.S. operations
Divested of certain non-core assets resulting in net proceeds of $225 million$3.4 billion.
At December 31, 2015,2017, we had approximately $4.2$4.0 billion of liquidity consisting of $1.2 billion$563 million in cash and cash equivalents and $3.0$3.4 billion availabilityavailable under our revolving credit facility. As previously discussed in our Outlook section, we are targeting a $1.4$2.3 billion Capital Development Program for 2016. Given2018. We believe our objective of spending within our cash flow in 2016, we are evaluatingcurrent liquidity level and we will continue to evaluate our options, which includebalance sheet, along with our non-core asset disposition program and ability to access the capital markets provides us with the flexibility to adjustfund our Capital Program or to seek to raise additional capital throughbusiness throughout the issuance of debt or equity securities.different commodity price cycles. We will also continue to driveevaluate the fundamentals of expense management, including organizational capacitycommodity price environment and operational reliability.our spending throughout 2018.

50


Cash Flows
The following table presents sources and uses of cash and cash equivalents from continuing operations for 2015, 20142017, 2016 and 2013:2015:
Year Ended December 31,Year Ended December 31,
(In millions)2015 2014 20132017 2016 2015
Sources of cash and cash equivalents 
  
   
  
  
Continuing operations$1,565
 $4,736
 $4,388
Discontinued operations
 751
 882
Disposals of assets225
 3,760
 450
Maturities of short-term investment925
 
 
Borrowings, net1,996
 
 
Operating activities - continuing operations$1,988
 $901
 $1,537
Disposals of assets, net of cash transferred to the buyer1,787
 1,219
 225
Common stock issuance
 1,236
 
Borrowings988
 
 1,996
Other91
 214
 189
68
 56
 101
Total sources of cash and cash equivalents$4,802
 $9,461
 $5,909
$4,831
 $3,412
 $3,859
Uses of cash and cash equivalents          
Cash additions to property, plant and equipment$(3,476) $(5,160) $(4,443)$(1,974) $(1,204) $(3,485)
Purchases of short-term investments(925) 
 
Investing activities of discontinued operations
 (376) (550)
Acquisitions
 (21) (74)
Acquisitions, net of cash acquired(1,891) (902) 
Purchases of common stock
 (1,000) (500)(11) (6) (11)
Commercial paper, net
 (135) (65)
Debt repayments(1,069) (68) (182)(2,764) (1) (1,069)
Debt issuance costs(19) 
 
Debt extinguishment costs(46) 
 
Dividends paid(460) (543) (508)(170) (162) (460)
Other(30) (24) (7)(30) (4) (8)
Total uses of cash and cash equivalents$(5,979) $(7,327) $(6,329)$(6,886) $(2,279) $(5,033)
Cash flows generated from continuing operationsoperating activities in 20152017 were lower than 2014higher as commodity prices and price realizations improved compared to 2016. This increase in price realization coupled with our increased sales volumes and continued focus on cost reductions resulted in an increase to cash flows generated from operating activities.
Proceeds from the disposals of assets for 2017 are primarily as a result of commodity prices declines, which were partially offset by increased net sales volumesthe disposal of our Canadian business, and proceeds from disposals of assets in 2016 are primarily from the North America E&P segment. Cash flows from continuing operations in 2014 were higher than in 2013 due to increased net sales volumes in the North America E&P segmentsale of our Wyoming upstream and lower cash tax payments (primarily Libya, a higher tax jurisdiction), partially offset by lower average price realizations in all segments,midstream assets, as well as lower net sales volumesthe sale of certain other non-operated CO2 and waterflood assets in the International E&P segment.
Cash flows from discontinued operations primarily related to our Norway business, which we disposed of in the fourth quarter of 2014.
West Texas and New Mexico. Disposals of assets in 2015 pertain to the sale of certain of our operated and non-operated producing properties in the Gulf of Mexico as well as natural gas assets in East Texas, North Louisiana and Wilburton, Oklahoma. Disposals in 2014 primarily reflect the proceeds from the sales of our Angola assets and our Norway business. In 2013, net proceeds were primarily related to the sales of our interests in Alaska, the Neptune gas plant and the DJ Basin. Disposition transactions are discussed in further detail in Item 8. Financial Statements and Supplementary Data – Note 5 to the consolidated financial statements.

51Issuance of common stock reflects net proceeds received in March 2016 from our public sale of common stock. See Item 8. Financial Statements and Supplementary Data - Note 22 to the consolidated financial statements for additional information.


Borrowings in 2017 are a result of the issuance of $1 billion of 4.4% senior unsecured notes due in 2027. Our 2015 borrowings reflect net proceeds received from the issuance of senior notes in June 2015. See LiquidityFinancing transactions are discussed in further detail in Item 8. Financial Statements and Capital Resources below for additional information. In November 2015, we repaid our $1 billion 0.90% senior notes upon maturity.
In October 2015, we announced an adjustmentSupplementary Data – Note 15 to our quarterly dividend. See Capital Requirements belowthe consolidated financial statements for additional information.
Additions to property, plant and equipment are our mostreflect 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 for 2015, 20142017, 2016 and 2013:2015:
 Year Ended December 31,
(In millions)2015 2014 2013
North America E&P$2,553
 $4,698
 $3,649
International E&P368
 534
 456
Oil Sands Mining (a)
(10) 212
 286
Corporate25
 51
 58
Total capital expenditures2,936
 5,495
 4,449
Change in capital expenditure accrual540
 (335) (6)
Additions to property, plant and equipment$3,476
 $5,160
 $4,443
(a)     Reflects reimbursements earned from the governments of Canada and Alberta related to funds previously expended for Quest CCS capital equipment. Quest CCS was successfully completed and commissioned in the fourth quarter of 2015.
 Year Ended December 31,
(In millions)2017 2016 2015
United States E&P$2,081
 $936
 $2,553
International E&P42
 82
 368
Corporate27
 18
 25
Total capital expenditures2,150
 1,036
 2,946
Change in capital expenditure accrual(176) 168
 539
Additions to property, plant and equipment$1,974
 $1,204
 $3,485
During 2014,2017, we acquired 29closed 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 $902 million, shares at a costnet of $1 billion and in 2013 acquired 14 million shares at a cost of $500 million. There were no share repurchases in 2015.cash
See
acquired; see Item 8. Financial Statements and Supplementary Data – Note 234 to the consolidated financial statements for discussionfurther information concerning acquisitions.
In December 2017, we redeemed $1 billion of purchases5.125% municipal revenue bonds due in 2037 in a refunding transaction. Additionally, during the third quarter of common stock.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. In November 2015, we repaid our $1 billion 0.90% senior notes upon maturity. Financing transactions are discussed in further detail in Item 8. Financial Statements and Supplementary Data – Note 15 to the consolidated financial statements for additional information.
During 2017, the Board of Directors approved a $0.05 per share quarterly dividend. See Capital Requirements below for additional information about the fourth quarter dividend. During 2015 we announced an adjustment to our quarterly dividend starting in third quarter 2015, with the full-year impact resulting in a decrease of dividends paid in 2017 and 2016.
Liquidity and Capital Resources
OnIn June 10, 2015,2017, we issued $2 billion aggregate principal amountextended the maturity date of unsecured senior notes which consist of the following series:
$600 million of 2.70% senior notes due June 1, 2020
$900 million of 3.85% senior notes due June 1, 2025
$500 million of 5.20% senior notes due June 1, 2045
Interest on each series of senior notes is payable semi-annually beginning December 1, 2015. We used the aggregate net proceeds to repay our $1 billion 0.90% senior notes on November 2, 2015, and the remainder for general corporate purposes.
In May 2015, we amended our $2.5 billion Credit Facility from May 28, 2020, to increase the facility sizeMay 28, 2021. In July 2017, we increased our $3.3 billion unsecured Credit Facility by $500$93 million to a total of $3.0 billion and extend$3.4 billion. Fees on the maturity date by an additional year such thatunused commitment of each lender, as well as the borrowing options under the Credit Facility, now matures in May 2020.  The amendment additionally provides usremain unaffected by the increase and term extension. We have the ability to request two additional one-year extensions to the maturity date and an option to increase the commitment amount by up to an additional $500$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.  Fees on the unused commitment of each lender, as well as the borrowing options under the Credit Facility, remain unchanged.
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 committed revolving credit facilityfacility. At December 31, 2017, we had approximately $4.0 billion of liquidity consisting of $563 million in cash and salescash equivalents and $3.4 billion available under our revolving credit facility. During the first quarter of non-core assets.2018, we expect to receive $750 million in remaining proceeds from the sale of our Canadian business. Our working capital requirements are supported by these sources and we may issue either commercial paper backed by our $3.0 billion revolving credit facility or draw on our $3.0 billion 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.management program. Because of the alternatives available to us as discussed above, we believe that our short-term and long-term liquidity isare adequate to fund not only our current operations, but also our near-term and long-term funding requirements including our capital spending programs, 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, 2017 are: Standard & Poor's Ratings Services BBB- (stable); Fitch Ratings BBB (stable); and Moody's Investor Services, Inc. Ba1 (stable). A downgrade in our credit ratings could negatively impactincrease our future cost of capital andfinancing or limit our ability to access the capital, markets, increase the interest rate and fees we pay on our unsecured revolving credit facility, restrict our access to the commercial paper market, or require us to post letters of credit or other forms ofresult in additional collateral for certain

52


obligations.requirements. See Item 1A. Risk Factors for a further discussion of how a downgrade in our credit ratings particularly below investment grade, could affect us.
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, 2015,2017, we had no borrowings against our revolving credit facility and no amounts outstanding under our U.S. commercial paper program that is backed by the revolving credit facility.
At December 31, 2015,2017, we had $7.3$5.5 billion in long-term debt outstanding. 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.
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 from time to time.securities.

Asset Disposals
We are targeting to generate $750 million to $1closed on $1.8 billion from selectof non-core asset sales.sales during 2017, with the largest transaction being the disposal of our Canadian business. During 2015,the third quarter of 2017, we closed or announced asset sales in excess of $300 million (before closing adjustments) from this program by divesting ofentered into separate agreements to sell certain operated and non-operated producingnon-core properties in our International E&P segment for combined proceeds of $53 million, before closing adjustments. We have closed on one of these agreements in 2017, and we expect the Gulfremainder of Mexicothe agreements to close during 2018.
See Item 8. Financial Statements and natural gas assets in East Texas, North Louisiana and Wilburton, Oklahoma. SeeSupplementary Data – Note 5 to the consolidated financial statements for additional discussion of these dispositions.    
Cash-Adjusted 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 cash-adjusted debt-to-capital ratio (total debt-minus-cash to total debt-plus-equity-minus-cash) was 25%32% at December 31, 20152017 and 16%29% at December 31, 2014.2016.
(Dollars in millions)2015 20142017 2016
Long-term debt due within one year$1
 $1,068
$
 $686
Long-term debt7,276
 5,295
5,494
 6,581
Total debt$7,277
 $6,363
$5,494
 $7,267
Cash and cash equivalents$1,221
 $2,398
Equity$18,553
 $21,020
$11,708
 $17,541
Calculation ��    
Total debt$7,277
 $6,363
$5,494
 $7,267
Minus cash and cash equivalents1,221
 2,398
Total debt minus cash and cash equivalents6,056

3,965
Total debt$7,277
 $6,363
Plus equity18,553
 21,020
Minus cash and cash equivalents1,221
 2,398
Total debt plus equity minus cash, cash equivalents$24,609

$24,985
Cash-adjusted debt-to-capital ratio25% 16%
Total debt plus equity (total capitalization)$17,202

$24,808
Debt-to-capital ratio32% 29%
Capital Requirements
Capital Spending
Our approved Capital Development Program for 20162018 is $1.4$2.3 billion. Additional details were previously discussed in Outlook.
Share Repurchase Program
The remaining share repurchase authorization as of December 31, 20152017 is $1.5 billion.
Other Expected Cash Outflows
On January 27, 2016,30, 2018, our Board of Directors approved a dividend of $0.05 per share for the fourth quarter of 2015.2017. The dividend is payable on March 10, 201612, 2018 to shareholders on record on February 17, 2016. The fourth quarter dividend is consistent with the third quarter of 2015, which was a reduction as compared to the quarterly dividends of $0.21 per share for each of the first and second quarters. We reduced the dividend as as we continue to address the uncertainty of a lower for

53


longer commodity price environment, align with our priority of maintaining a strong balance sheet through the cycle and provide additional capital flexibility to support growth from the U.S. resource plays when commodity prices improve.21, 2018.
We plan to make contributions of up to $62$65 million to our funded pension plans during 2016.2018. Cash contributions to be paid from our general assets for the unfunded pension and postretirement plans are expected to be approximately $8$6 million and $21 million in 2016.2018.

Contractual Cash Obligations
The table below provides aggregated information on our consolidated obligations to make future payments under existing contracts as of December 31, 2015.2017.
(In millions)Total 2016 
2017-
2018
 
2019-
2020
 
Later
Years
Total 2018 
2019-
2020
 
2021-
2022
 
Later
Years
Short and long-term debt (includes interest)(a)
$11,870
 $365
 $2,196
 $1,354
 $7,955
$8,776
 $256
 $1,103
 $1,512
 $5,905
Lease obligations178
 30
 52
 50
 46
119
 29
 55
 31
 4
Purchase obligations:                  
Oil and gas activities(b)
382
 263
 70
 37
 12
108
 94
 8
 4
 2
Service and materials contracts(c)
761
 90
 128
 37
 506
115
 65
 48
 2
 
Transportation and related contracts1,768
 256
 495
 393
 624
1,581
 313
 483
 241
 544
Drilling rigs and fracturing crews(d)
270
 119
 151
 
 
21
 21
 
 
 
Other (g)
141
 26
 29
 30
 56
42
 13
 24
 5
 
Total purchase obligations3,322
 754
 873
 497
 1,198
1,867
 506
 563
 252
 546
Other long-term liabilities reported in the consolidated balance sheet(e)
618
 94
 158
 113
 253
486
 141
 77
 63
 205
Total contractual cash obligations(f)
$15,988
 $1,243
 $3,279
 $2,014
 $9,452
$11,248
 $932
 $1,798
 $1,858
 $6,660
(a) 
Includes anticipated cash payments for interest of $365$256 million for 2016, $660 million for 2017-2018, $5262018, $503 million for 2019-2020, $477 million for 2021-2022 and $3,018$2,003 million for the remaining years for a total of $4,569$3,239 million.
(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 contractually obligated exploratory work programs that are expensed immediately.
(c) 
Service and materials contracts include contracts to purchase services such as utilities, supplies and various other maintenance and operating services.
(d) 
Some contracts may be canceled at an amount less than the contract amount. Were we to elect that option where possible at December 31, 20152017 our minimum commitment would be $163$14 million.
(e) 
Primarily includes obligations for pension and other postretirement benefits including medical and life insurance. We have estimated projected funding requirements through 2025.2027. Although unrecognized tax benefits are not a contractual obligation, they are presented in this table because they represent potential demands on our liquidity.
(f) 
This table does not include the estimated discounted liability for dismantlement, abandonment and restoration costs of oil and gas properties of $1,635$1,483 million. See Item 8. Financial Statements and Supplementary Data – Note 1811 to the consolidated financial statements.
(g)

We expect to make severance payments of approximately $8 million in 2016 related to the workforce reduction in 2015.
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 alonestand-alone letters of credit when required by a business partner. Such letters of credit outstanding at December 31, 2017, 2016 and 2015 2014 and 2013 aggregated $53$89 million, $101$166 million and $119$53 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 insure our payments for outstanding company debtsupport firm transportation agreements and future abandonment liabilities.

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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.
Legislation and regulations pertaining to climate change and greenhouse gas emissions have the potential to materially adversely impact our business, financial condition, results of operations and cash flows, including costs of compliance and permitting delays. The extent and magnitude of these adverse impacts cannot be reliably or accurately estimated at this time because specific regulatory and legislative requirements have not been finalized and uncertainty exists with respect to the measures being considered, the costs and the time frames for compliance, and our ability to pass compliance costs on to our customers. For additional information see Item 1A. Risk Factors.
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
The estimation of quantities of net reserves is a highly technical process performed by our engineers for crude oil and condensate, NGLs and natural gas and by outside consultants for synthetic crude oil, which is based upon several underlying assumptions that are subject to change. Estimates of reserves may change, either positively or negatively, 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. The data for a given reservoir may also change substantially 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. Consequently, material revisions (upward or downward) to existing reserve estimates may occur from time to time. Reserve estimates are based upon an unweighted average of commodity prices in the prior 12-month period, using the closing prices on the first day of each month. Further reductions in commodity prices could have a material effect on the quantity and present value of our proved reserves and could also cause further reductions to our near term capital programs which would defer investment until prices improved. A shifting of capital expenditures into future periods outside of five years from the initial proved reserve booking could potentially lead to a reduction in proved undeveloped reserves.
Our December 31, 2015 proved reserves were calculated using the SEC pricing. The table below provides the 2015 SEC pricing for certain of the benchmark prices as well as the unweighted average for the first two months of 2016:

55


 Unweighted 12-month 2015 AverageUnweighted 2-month 2016 Average
WTI Crude oil$50.28
$34.19
Henry Hub natural gas$2.59
$2.28
Brent crude oil$54.25
$34.86
Natural gas liquids$17.32
$12.87
When determining the December 31, 2015 proved reserves for each property, the benchmark prices listed above were adjusted using price differentials that account for property-specific quality and location differences.
Beginning in the second half of 2014, the crude oil and Henry Hub benchmarks began to decline and these declines continued through 2015 and into 2016. Commodity prices are likely to remain volatile based on global supply and demand and could decline further. Sustained reduced commodity prices could have a material effect on the quantity and future cash flows of our proved reserves. For further discussion of risks associated with our estimation of proved reserves, see Part I. Item 1A Risk Factors.
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 and synthetic crude oil reserves.
The existence and the estimated amount of reservesestimated 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. Additionally, bothIn addition, the expected future cash flows to be generated by oil and gas producing properties are used infor testing such properties for impairment and the expected future taxable income available to realize deferred tax assets, also rely, in part, rely on estimates of quantities of net reserves. Accordingly, a decline in estimatesRefer 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 could cause usestimation 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, performadditional development activity, production history and continual reassessment of the viability of production under varying economic conditions.


Reserve estimates are based on an impairment analysis to determine ifunweighted arithmetic average of commodity prices during the carrying value exceeds12-month period, using the fair value and could result in an impairment charge. In addition, a decline in estimatesclosing prices on the first day of quantities of neteach month, as defined by the SEC. The table below provides the 2017 SEC pricing for certain benchmark prices:
 SEC Pricing 2017
WTI Crude oil (per bbl)$51.34
Henry Hub natural gas (per mmbtu)$2.98
Brent crude oil (per bbl)$54.39
Mont Belvieu NGLs (per bbl)$22.03
When determining the December 31, 2017 proved reserves could promptfor each property, the benchmark prices listed above were adjusted using price differentials that account for property-specific quality and location differences.
Estimates of future cash flows associated with proved reserves are based on actual costs of developing and producing proved reserves at the end of the year. If commodity prices were to decrease by approximately 10%, below average prices used to estimate 2017 proved reserves (see table above), we would not expect price related reserve revisions to have a goodwill impairment analysismaterial impact on proved reserve volumes. For further discussion of risks associated with our International E&P segment before or after our annual test at April 1.estimation of proved reserves, see Part I. Item 1A Risk Factors.
Depreciation and depletion of crude oil and condensate, NGLs and natural gas and synthetic crude oil producing properties is determined by the units-of-production method and could change with revisions to estimated proved reserves. While revisions of previous reserve estimates have not historically been significant to the depreciation and depletion rate to anyrates of our segments, over the past three years, any reduction in proved reserves, especially as a result of lower commodity prices, could result in an acceleration of future DD&A expense. The following table illustrates, on average, the sensitivity of each segment's units-of-production DD&A per boe and pretax income to a hypothetical 10% change in 20152017 proved reserves based on 20152017 production.
Impact of a Ten% Increase in Proved Reserves Impact of a Ten% Decrease in Proved ReservesImpact of a 10% Increase in Proved Reserves Impact of a 10% Decrease in Proved Reserves
(In millions, except per boe)DD&A per boe Pretax Income DD&A per boe Pretax IncomeDD&A per boe Pretax Income DD&A per boe Pretax Income
North America E&P$(2.20) $216
 $2.69
 $(264)
United States E&P$(2.14) $183
 $2.61
 $(224)
International E&P$(0.63) $27
 $0.77
 $(33)$(0.56) $30
 $0.69
 $(36)
Oil Sands Mining$(1.04) $17
 $1.46
 $(24)
Asset Retirement Obligations
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, including bitumen mining 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. 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

56


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 future impairment charges.charges or in the recognition of income. See Item 8. Financial Statements and Supplementary Data – Note 1811 to the consolidated financial statements for disclosures regarding our asset retirement obligation estimates.
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 1514 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, or synthetic crude oil, sustained declines in our common stock, reductions to our Capital Development Program, 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 for our North America E&P and International E&Por, in certain instances, by logical grouping of assets and at the project level for OSM 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 2015, we determined that the substantial decline in2017 lower forecasted long-term commodity prices and the resulting changeanticipated sales of certain non-core proved properties in future commodity price assumptions was a triggering event which required us to

57


reassessour International E&P segment 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 an income and market approach and recognized impairments during 2015. Commodity prices are oneimpairments. As of theDecember 31, 2017 our estimated undiscounted cash flows relating to our remaining long-lived assets significantly exceeded their carrying values. Long-lived assets most significant inputs into our models. A further decline in our commodity price assumptions could result in additionalat risk for future impairment charges.had estimated undiscounted cash flows that exceeded their $66 million carrying value by $22 million. See Item 8. Financial Statements and Supplementary Data Note 1310 and Note 1514 to the consolidated financial statements for discussion of impairments recorded in 2015, 20142017, 2016 and 20132015 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 and synthetic crude oil 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 and synthetic crude oil 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 and synthetic crude oil.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 engineerengineering studies which estimate reserves, as well as expected capital development 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 reasonable. However, actual results may differ from these projections. A further sustained decline in commodity prices may cause usreasonably likely to reassess our long-lived assets for impairment, and could result in future non-cash impairment charges as a result of such impairment assessments.
occur. An estimate of the sensitivity to net income resulting from impairmentchanges 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. That is, unfavorableUnfavorable adjustments to some of the above listed assumptions maywould 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 must beis tested for impairment at least annually,on an annual basis, or between annual tests if an event occurswhen events or changes in circumstances change that would more likely than not reduceindicate the fair value of a reporting unit with goodwill may have been reduced below its carrying amount.value. Goodwill is tested for impairment at the reporting unit level. After weOur reporting units are the same as our reporting segments, of which only International E&P includes goodwill. We performed our annual impairment test in April 2015, there was a continued decline in commodity prices as discussed above. Downward revisions to forecasted commodity price assumptions and sustained price declines in our common stock were triggering events which required us to reassess our goodwillthe second quarter of 2017 for impairment as of September 30 and December 31, 2015. Based on the results of these assessments, we fully impaired the goodwill associated with our N.A.International E&P reporting unit. Whileunit and no impairment was required. As of the date of our last goodwill impairment assessment, our International E&P reporting unit fair value exceeded its book value by over 40%.
We estimate the fair valuevalues of our International E&P reporting unit exceeded book value at December 31, 2015, subsequent commodity price and/or common stock price declines may cause us to reassess our goodwill for impairment and could result in a non-cash impairment charge in the future.
We estimated the fair values of the North America E&P and International E&P reporting units using a combination of market and income approaches. Determining the fair value of a reporting unit requires judgment and the use of significant estimates and assumptions. The market approach referenced observable inputs specific to us and our industry.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 calculated the present value of expected futureutilizes discounted cash flows, which wereare 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.long lived assets and are consistent with those that management uses to make business decisions. 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

58


determinations of whether or not an impairment is indicated. See Item 8. Financial Statements and Supplementary Data Note 1412 to the consolidated financial statements for additional discussion of the goodwill impairment recorded in 2015.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 1513 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.
On December 22, 2017, the United States enacted the Tax Cuts and Jobs Act ("Tax Reform Legislation"), which made significant changes to U.S. federal income tax law. We expect that certain aspects of the Tax Reform Legislation will positively impact our future after-tax earnings in the U.S., primarily due to the lower federal statutory tax rate. The Tax Reform Legislation is a comprehensive bill containing several other provisions, such as limitations on the deductibility of interest expense and certain executive compensation, that are not expected to have a material effect on our results. The ultimate impact of the Tax Reform Legislation may differ from our estimates due to changes in interpretations and assumptions made by us, as well as additional regulatory guidance that may be issued. Item 8. Financial Statements and Supplementary Data – Note 7 to the consolidated financial statements for further disclosure regarding Tax Reform Legislation.
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. WeIn 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 the preponderanceall available positive and negative evidence. Positive evidence includes reversals of evidence concerning the realizationtemporary differences, forecasts of the deferred tax asset. We must consider any prudentfuture taxable income, assessment of future business assumptions and feasibleapplicable tax planning strategies that might minimizeare prudent and feasible. Negative evidence includes losses in recent years as well as the amountforecasts of deferred tax liabilities recognized or the amount of any valuation allowance recognized against deferred tax assets, if we can implement the strategies and if we expect to implement themfuture income (loss) in the event the forecasted conditions actually occur. Assumptions related to the permanent reinvestment of the earnings ofrealizable period. In making our foreign subsidiaries are reconsidered quarterly to give effect to changes in our portfolio of producing properties and in our tax profile. In the second quarter of 2015, we reviewed our operations and concluded that we do not have the same level of capital needs outside the U.S. as previously expected. Therefore, we no longer intend for previously unremitted foreign earnings of approximately $1 billion associated with our Canadian operations to be permanently reinvested outside the U.S. As such, none our foreign earnings remain permanently reinvested abroad.
Our net deferred tax assets, afterassessment regarding valuation allowances, are expected to be realized throughwe weight the evidence based on objectivity.
We base our future taxable income and the reversal of temporary differences.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 (particularly liquid hydrocarbon, natural gas and synthetic crude oil prices) and the assessment of the effects of foreign taxes on our U.S. federal income taxes. The estimatesFuture operating conditions can be affected by numerous factors, including (i) future crude oil and assumptions used in determining future taxable income are consistent with those used in our planningcondensate, NGLs and capital investment reviews. We consider a combination of reserve categories related to our existing producing properties, as well asnatural gas prices, (ii) estimated quantities of crude oil and condensate, NGLs and natural gas, (iii) expected timing of production, and synthetic crude oil related to undeveloped discoveries if,(iv) future capital requirements. These assumptions are described in our judgment, it is likely that development plans will be approved in the foreseeable future. Assumptionsfurther detail above regarding our abilityimpairment assessment of long-lived assets. An estimate of the sensitivity to realizechanges in assumptions resulting in future taxable income calculations is not practicable, given the U.S. federal benefitnumerous assumptions that can materially affect our estimates. Unfavorable adjustments to some of foreign tax credits are based on certain estimates concerning future operating conditions (particularly crude oil and condensate, NGLs, natural gas and synthetic crude oil prices), future financial conditions, income generated from foreign sources and our tax profilethe above listed assumptions would likely be offset by favorable adjustments in other assumptions. For example, the year that such credits may be claimed. Aimpact of sustained decline inreduced commodity prices could cause us to recordon future taxable income would likely be partially offset by lower capital expenditures.
Based on the assumptions and judgments described above, as of December 31, 2017, we reflect a valuation allowance in our Consolidated Balance Sheet of $926 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 $898 million, which will expire in 2035, 2036 and U.S.2037. Since December 31, 2016, we have maintained a full valuation allowance on our net federal benefitdeferred tax assets. If objective negative evidence in the form of foreigncumulative losses is 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 credits.assets considered realizable and reduce the provision for income taxes in the period of adjustment.
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
health care cost projections.
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 $250 million par value outstanding. The constructed yield curve is based on those bonds representing the 50% highest yielding issuances within each defined maturity group.

59


Of the assumptions used to measure obligations and estimated annual net periodic benefit cost as of December 31, 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 4.04%3.55% for our U.S. pension plans and 4.36%3.54% for our other U.S. postretirement benefit plans is summarized in the table below:
Impact of a 0.25% Increase in Discount Rate Impact of a 0.25% Decrease in Discount RateImpact of a 0.25% Increase in Discount Rate Impact of a 0.25% Decrease in Discount Rate
(In millions)Obligation Expense Obligation ExpenseObligation Expense Obligation Expense
U.S. pension plans$(14) $(1) $14
 $1
$(4) $
 $4
 $
Other U.S. postretirement benefit plans$(6) $
 $7
 $
$(5) $
 $5
 $
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 6.75%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 2017 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.
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.


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 and synthetic crude oil 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 and foreign currency exchange rates. We employ various strategies, including the use of financial derivative instruments, to manage the risks related to these 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 or rate 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 – Notes 1513 and 1614 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.

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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 20152017 and 20132016 were impacted by crude oil and natural gas derivatives related to a portion of our North Americaforecasted United States E&P crude oil sales. There were no crude oil derivatives in 2014. The table below provides a summary of open positions as of December 31, 2015:
2017 and the weighted average price for those contracts:
Financial InstrumentWeighted Average PriceBarrels per dayRemaining Term
Three-Way Collars 
Crude OilCrude Oil
2018 2019
First Quarter Second Quarter Third Quarter Fourth Quarter First Quarter Second Quarter
Three-Way Collars (a)
    
Volume (Bbls/day)85,000 85,000 85,000 85,000 10,000 10,000
Weighted average price per Bbl:   
Ceiling$60.0310,000
January - March 2016 (a)
$56.38 $56.38 $56.96 $56.96 $60.00 $60.00
Floor$50.20 $51.65 $51.65 $51.53 $51.53 $55.00 $55.00
Sold put$41.60 $45.00 $45.00 $44.65 $44.65 $47.00 $47.00
 
Ceiling$71.8412,000January- December 2016
Floor$60.48 
Sold put$50.00 
 
Ceiling$73.132,000
January- June 2016 (b)
Floor$65.00 
Sold put$50.00 
Sold Call Options
$72.3910,000
January- December 2016 (c)
Swaps   
Volume (Bbls/day)20,000 20,000    
Weighted average price per Bbl$55.12 $55.12 $— $— $— $—
Basis Swaps (b)
   
Volume (Bbls/day)5,000 5,000 10,000 10,000  
Weighted average price per Bbl$(0.60) $(0.60) $(0.67) $(0.67) $— $—
(a) 
Counterparties have the option, exercisable on March 31, 2016, to extend theseBetween January 1, 2018 and February 12, 2018, we entered into 10,000 Bbls/day of three-way collars through September of 2016 at the same volume and weightedfor July - December 2018 with an average price as the underlying three-way collars.ceiling
price of $63.51, a floor price of $57.00, and a sold put price of $50.00 and 20,000 Bbls/day of three-way collars for January - June 2019 with an average ceiling price of $67.92, a floor price of $53.50, and a sold put price of $46.50.
(b) 
Counterparty has the option, exercisable on June 30, 2016, to extend these collars through the remainder of 2016 at the same volumeThe basis differential price is between WTI Midland and weighted average price as the underlying three-way collars.
(c)
Call options settle monthly.WTI Cushing.

Natural Gas
 2018
 First QuarterSecond QuarterThird QuarterFourth Quarter
Three-Way Collars    
Volume (MMBtu/day)200,000160,000160,000160,000
Weighted average price per MMBtu    
Ceiling$3.79$3.61$3.61$3.61
Floor$3.08$3.00$3.00$3.00
Sold put$2.55$2.50$2.50$2.50
The following table below provides a sensitivity analysis of the projected incremental effect on income (loss) from operations of a hypothetical 10% change in NYMEX WTI and Henry Hub prices on our open commodity derivativesderivative instruments as of December 31, 2015:
2017:
(In millions)Hypothetical Price Increase of 10%Hypothetical Price Decrease of 10%Hypothetical Price Increase of 10%Hypothetical Price Decrease of 10%
Crude oil commodity derivatives(8)5
Crude oil derivatives$(180)$149
Natural gas derivatives(8)7
Total$(188)$156
Interest Rate Risk
At December 31, 2015,2017, our portfolio of long-term debt was substantially comprised of fixed rate instruments. We currently manage our exposure to interest rate movements by utilizing interest rate swap agreements that effectively convert a portion of our fixed rate debt to floating interest rate debt. As of December 31, 2015, we had multiple interest rate swap agreements with a total notional of $900 million designated as fair value hedges.
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. Sensitivity analysis of the incremental effect of a hypothetical 10% change in interest rates on our financial assets and liabilities as of December 31, 2015,2017, is provided in the following table.

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  Incremental
  Change in
(In millions) Fair Value Fair ValueFair Value Hypothetical Price Increase of 10%Hypothetical Price Decrease of 10%
Financial assets (liabilities): (a)
       
Interest rate swap agreements$8
(b) 
$2
Long-term debt, including amounts due within one year$(6,723)
(b)(c) 
$(307)$(5,976)
(b)(c) 
$190
$(202)
(a) 
Fair values of cash and cash equivalents, receivables, commercial paper, accounts payable and accrued interest approximate carrying value and are relatively insensitive to changes in interest rates due to the short-term maturity of the instruments. Accordingly, these instruments are excluded from the table.
(b) 
Fair value was based on market prices where available, or current borrowing rates for financings with similar terms and maturities.
(c) 
Excludes capital leases.
Counterparty Risk
We are also exposed to financial risk in the event of nonperformance by counterparties. If commodity prices remain at or 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.


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Item 8. Financial Statements and Supplementary Data
Index
 Page
  
  
  
  
 
  
  
  
  
  
  
  
  
  
  


63


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  /s/ John R. SultDane E. Whitehead   
President and Chief Executive Officer  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, 2015.2017.
The effectiveness of Marathon Oil’s internal control over financial reporting as of December 31, 20152017 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  /s/ John R. SultDane E. Whitehead  
President and Chief Executive Officer  Executive Vice President and Chief Financial Officer  

64


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 as of December 31, 2017 and 2016, 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, 2017, 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, 2017, 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 listed in the accompanying indexreferred to above present fairly, in all material respects, the financial position of Marathon Oil Corporation and its subsidiaries (the “Company”)atthe Company as of December 31, 20152017 and 2014,2016, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2015,2017 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, 2015,2017, based on criteria established in Internal Control - Integrated Framework - 2013(2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). 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 thesethe Company’s consolidated financial statements and on the Company's internal control over financial reporting based on our integrated 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 Public Company Accounting Oversight Board (United States).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 supportingregarding the amounts and disclosures in the consolidated financial statements, assessingstatements. Our audits also included evaluating the accounting principles used and significant estimates made by management, andas well as evaluating the overall presentation of the consolidated financial statement presentation.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.

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 25, 201622, 2018


65We have served as the Company’s auditor since 1982.




MARATHON OIL CORPORATION
Consolidated Statements of Income
Year Ended December 31,Year Ended December 31,
(In millions, except per share data)2015 2014 20132017 2016 2015
Revenues and other income:          
Sales and other operating revenues, including related party$4,951
 $8,736
 $9,246
$4,211
 $2,930
 $4,136
Marketing revenues571
 2,110
 2,079
162
 240
 499
Income from equity method investments145
 424
 423
256
 175
 145
Net gain (loss) on disposal of assets120
 (90) (29)58
 389
 120
Other income74
 78
 64
78
 53
 53
Total revenues and other income5,861
 11,258
 11,783
4,765
 3,787
 4,953
Costs and expenses:          
Production1,694
 2,246
 2,156
706
 712
 979
Marketing, including purchases from related parties569
 2,105
 2,076
168
 245
 500
Other operating438
 462
 389
431
 484
 410
Exploration1,318
 793
 891
409
 323
 971
Depreciation, depletion and amortization2,957
 2,861
 2,500
2,372
 2,156
 2,721
Impairments752
 132
 96
229
 67
 721
Taxes other than income234
 406
 345
183
 151
 216
General and administrative590
 654
 659
400
 481
 588
Total costs and expenses8,552
 9,659
 9,112
4,898
 4,619
 7,106
Income (loss) from operations(2,691) 1,599
 2,671
(133) (832) (2,153)
Net interest and other(267) (238) (278)(270) (332) (286)
Loss on early extinguishment of debt(51) 
 
Income (loss) from continuing operations before income taxes(2,958) 1,361
 2,393
(454) (1,164) (2,439)
Provision (benefit) for income taxes(754) 392
 1,462
376
 923
 (738)
Income (loss) from continuing operations(2,204) 969
 931
(830) (2,087) (1,701)
Discontinued operations
 2,077
 822
Income (loss) from discontinued operations(4,893) (53) (503)
Net income (loss)$(2,204) $3,046
 $1,753
$(5,723) $(2,140) $(2,204)
Per Share Data          
Basic:          
Income (loss) from continuing operations$(3.26) $1.42
 $1.32
$(0.97) $(2.55) $(2.51)
Discontinued operations$
 $3.06
 $1.17
Income (loss) from discontinued operations$(5.76) $(0.06) $(0.75)
Net income (loss)$(3.26) $4.48
 $2.49
$(6.73) $(2.61) $(3.26)
Diluted:          
Income (loss) from continuing operations$(3.26) $1.42
 $1.31
$(0.97) $(2.55) $(2.51)
Discontinued operations$
 $3.04
 $1.16
Income (loss) from discontinued operations$(5.76) $(0.06) $(0.75)
Net income (loss)$(3.26) $4.46
 $2.47
$(6.73) $(2.61) $(3.26)
Dividends$0.68
 $0.80
 $0.72
$0.20
 $0.20
 $0.68
Weighted average shares:          
Basic677
 680
 705
850
 819
 677
Diluted677
 683
 709
850
 819
 677
The accompanying notes are an integral part of these consolidated financial statements.

66


MARATHON OIL CORPORATION
Consolidated Statements of Comprehensive Income
Year Ended December 31,Year Ended December 31,
(In millions)2015 2014 20132017 2016 2015
Net income (loss)$(2,204) $3,046
 $1,753
$(5,723) $(2,140) $(2,204)
Other comprehensive income (loss)          
Postretirement and postemployment plans          
Change in actuarial loss and other228
 (52) 300
21
 16
 228
Income tax benefit (provision)(86) 25
 (112)
Income tax provision (benefit)7
 (4) (86)
Postretirement and postemployment plans, net of tax142
 (27) 188
28
 12
 142
Derivative hedges          
Net unrecognized gain
 1
 1
Income tax provision
 
 
Net unrecognized gain (loss)(13) 61
 
Reclassification of gains on terminated derivative hedges(47) 
 
Income tax provision (benefit)21
 (22) 
Derivative hedges, net of tax
 1
 1
(39) 39
 
Foreign currency translation and other     
Unrealized loss
 
 (3)
Income tax benefit (provision)
 (1) 1
Foreign currency translation and other, net of tax
 (1) (2)
Foreign currency hedges     
Net recognized loss reclassified to discontinued operations34
 
 
Income tax provision (benefit)(4) 
 
Foreign currency hedges, net of tax30
 
 
Other, net of tax2
 1
 
Other comprehensive income (loss)142
 (27) 187
21
 52
 142
Comprehensive income (loss)$(2,062) $3,019
 $1,940
$(5,702) $(2,088) $(2,062)
The accompanying notes are an integral part of these consolidated financial statements.


67


MARATHON OIL CORPORATION
Consolidated Balance Sheets
December 31,December 31,
(In millions, except par values and share amounts)2015 20142017 2016
Assets      
Current assets:      
Cash and cash equivalents$1,221
 $2,398
$563
 $2,488
Receivables, less reserve of $4 and $3912
 1,729
Receivables, less reserve of $12 and $61,082
 748
Notes receivable748
 
Inventories313
 357
126
 136
Other current assets144
 109
36
 66
Current assets held for sale11
 227
Total current assets2,590
 4,593
2,566
 3,665
Equity method investments1,003
 1,113
847
 931
Property, plant and equipment, less accumulated depreciation, 
  
 
  
depletion and amortization of $23,260 and $21,88427,061
 29,040
depletion and amortization of $21,564 and $20,25517,665
 16,727
Goodwill115
 459
115
 115
Other noncurrent assets1,542
 778
764
 558
Noncurrent assets held for sale55
 9,098
Total assets$32,311
 $35,983
$22,012
 $31,094
Liabilities      
Current liabilities:      
Accounts payable1,313
 2,545
$1,395
 $967
Payroll and benefits payable133
 191
108
 129
Accrued taxes132
 285
177
 94
Other current liabilities150
 290
288
 243
Long-term debt due within one year1
 1,068

 686
Current liabilities held for sale
 121
Total current liabilities1,729
 4,379
1,968
 2,240
Long-term debt7,276
 5,295
5,494
 6,581
Deferred tax liabilities2,441
 2,486
833
 769
Defined benefit postretirement plan obligations403
 598
362
 345
Asset retirement obligations1,601
 1,917
1,428
 1,602
Deferred credits and other liabilities308
 288
217
 225
Noncurrent liabilities held for sale2
 1,791
Total liabilities13,758
 14,963
10,304
 13,553
Commitments and contingencies
 


 

Stockholders’ Equity      
Preferred stock - no shares issued or outstanding (no par value,      
26 million shares authorized)
 

 
Common stock:      
Issued – 770 million shares (par value $1 per share, 1.1 billion shares authorized)770
 770
Securities exchangeable into common stock – no shares issued 
  
or outstanding (no par value, 29 million shares authorized)
 
Held in treasury, at cost – 93 million and 95 million shares(3,554) (3,642)
Issued – 937 million and 937 million shares, respectively (par value $1 per share, 1.1 billion shares authorized)937
 937
Held in treasury, at cost – 87 million and 90 million shares(3,325) (3,431)
Additional paid-in capital6,498
 6,531
7,379
 7,446
Retained earnings14,974
 17,638
6,779
 12,672
Accumulated other comprehensive loss(135) (277)(62) (83)
Total stockholders' equity18,553
 21,020
11,708
 17,541
Total liabilities and stockholders' equity$32,311
 $35,983
$22,012
 $31,094
The accompanying notes are an integral part of these consolidated financial statements.

68


MARATHON OIL CORPORATION
Consolidated Statements of Cash Flows
Year Ended December 31,Year Ended December 31,
(In millions)2015 2014 20132017 2016 2015
Increase (decrease) in cash and cash equivalents          
Operating activities: 
     
    
Net income (loss)$(2,204) $3,046
 $1,753
$(5,723) $(2,140) $(2,204)
Adjustments to reconcile net income (loss) to net cash provided by operating activities: 
     
    
Discontinued operations
 (2,077) (822)4,893
 53
 503
Deferred income taxes(806) 88
 (34)
Depreciation, depletion and amortization2,957
 2,861
 2,500
2,372
 2,156
 2,721
Impairments752
 132
 96
229
 67
 721
Pension and other postretirement benefits, net1
 (34) 45
Exploratory dry well costs and unproved property impairments1,214
 623
 720
323
 220
 867
Net (gain) loss on disposal of assets(120) 90
 29
(58) (389) (120)
Deferred income taxes(61) 828
 (804)
Net (gain) loss on derivative instruments(11) 63
 (126)
Net cash received (paid) in settlement of derivative instruments98
 61
 55
Stock based compensation50
 48
 45
Equity method investments, net33
 27
 12
20
 17
 33
Changes in:          
Current receivables817
 119
 217
(334) 67
 790
Inventories36
 (11) (19)10
 64
 25
Current accounts payable and accrued liabilities(965) (33) (208)297
 (137) (906)
All other operating, net(150) (95) 99
(117) (77) (63)
Net cash provided by continuing operations1,565
 4,736
 4,388
Net cash provided by discontinued operations
 751
 882
Net cash provided by operating activities1,565
 5,487
 5,270
Net cash provided by operating activities from continuing operations1,988
 901
 1,537
Investing activities:          
Additions to property, plant and equipment(1,974) (1,204) (3,485)
Acquisitions, net of cash acquired
 (21) (74)(1,891) (902) 
Additions to property, plant and equipment(3,476) (5,160) (4,443)
Disposal of assets225
 3,760
 450
Investments - return of capital77
 61
 61
Investing activities of discontinued operations
 (376) (550)
Disposal of assets, net of cash transferred to the buyer1,787
 1,219
 225
Equity method investments - return of capital64
 55
 77
Purchases of short term investments(925) 
 

 
 (925)
Maturities of short term investments925
 
 

 
 925
All other investing, net(28) (10) 35
(30) (1) 24
Net cash used in investing activities(3,202) (1,746) (4,521)
Net cash used in investing activities from continuing operations(2,044) (833) (3,159)
Financing activities:          
Commercial paper, net
 (135) (65)
Borrowings1,996
 
 
988
 
 1,996
Debt issuance costs(19) 
 
Debt repayments(1,069) (68) (182)(2,764) (1) (1,069)
Debt extinguishment costs(46) 
 
Common stock issuance
 1,236
 
Purchases of common stock
 (1,000) (500)(11) (6) (11)
Dividends paid(460) (543) (508)(170) (162) (460)
All other financing, net14
 153
 93

 1
 (5)
Net cash provided by (used in) financing activities462
 (1,593) (1,162)(2,003) 1,068
 451
Effect of exchange rate changes on cash:     
Continuing operations(2) (2) (3)
Discontinued operations
 (12) (4)
Cash Flow from Discontinued Operations:     
Operating activities141
 177
 39
Investing activities(13) (41) (43)
Changes in cash included in current assets held for sale2
 100
 90
Net increase in cash and cash equivalents of discontinued operations130
 236
 86
Effect of exchange rate changes on cash and cash equivalents:4
 (3) (3)
Net increase (decrease) in cash and cash equivalents(1,177) 2,134
 (420)(1,925) 1,369
 (1,088)
Cash and cash equivalents at beginning of period2,398
 264
 684
2,488
 1,119
 2,207
Cash and cash equivalents at end of period$1,221
 $2,398
 $264
$563
 $2,488
 $1,119
The accompanying notes are an integral part of these consolidated financial statements.

69


MARATHON OIL CORPORATION
Consolidated Statements of Stockholders’ Equity
Total Equity of Marathon Oil Stockholders  Total Equity of Marathon Oil Stockholders  
(In millions)
Preferred
Stock
 
Common
Stock
 
Securities
Exchangeable
into Common
Stock
 
Treasury
Stock
 
Additional
Paid-in
Capital
 
Retained
Earnings
 
Accumulated
Other
Comprehensive
Loss
 
Total
Equity
Preferred
Stock
 
Common
Stock
 
Treasury
Stock
 
Additional
Paid-in
Capital
 
Retained
Earnings
 
Accumulated
Other
Comprehensive
Loss
 
Total
Equity
December 31, 2012 Balance$
 $770
 $
 $(2,560) $6,616
 $13,890
 $(433) $18,283
December 31, 2014 Balance$
 $770
 $(3,642) $6,531
 $17,638
 $(277) $21,020
Shares issued - stock-based                            
compensation
 
 
 170
 (44) 
 
 126

 
 96
 (32) 
 
 64
Shares repurchased
 
 
 (513) 
 
 
 (513)
 
 (8) 
 
 
 (8)
Stock-based compensation
 
 
 
 20
 
 
 20

 
 
 (1) 
 
 (1)
Net income
 
 
 
 
 1,753
 
 1,753
Other comprehensive income
 
 
 
 
 
 183
 183
Dividends paid
 
 
 
 
 (508) 
 (508)
December 31, 2013 Balance$
 $770
 $
 $(2,903) $6,592
 $15,135
 $(250) $19,344
Shares issued - stock-based               
compensation
 
 
 276
 (57) 
 
 219
Shares repurchased
 
 
 (1,015) 
 
 
 (1,015)
Stock-based compensation
 
 
 
 (4) 
 
 (4)
Net income
 
 
 
 
 3,046
 
 3,046
Net loss
 
 
 
 (2,204) 
 (2,204)
Other comprehensive loss
 
 
 
 
 
 (27) (27)
 
 
 
 
 142
 142
Dividends paid
 
 
 
 
 (543) 
 (543)
 
 
 
 (460) 
 (460)
December 31, 2014 Balance$
 $770
 $
 $(3,642) $6,531
 $17,638
 $(277) $21,020
December 31, 2015 Balance$
 $770
 $(3,554) $6,498
 $14,974
 $(135) $18,553
Shares issued - stock-based                            
compensation
 
 
 96
 (32) 
 
 64

 
 128
 (86) 
 
 42
Shares repurchased
 
 
 (8) 
 
 
 (8)
 
 (5) 
 
 
 (5)
Stock-based compensation
 
 
 
 (1) 
 
 (1)
 
 
 (35) 
 
 (35)
Net loss
 
 
 
 
 (2,204) 
 (2,204)
 
 
 
 (2,140) 
 (2,140)
Other comprehensive income
 
 
 
 
 
 142
 142

 
 
 
 
 52
 52
Dividends paid
 
 
 
 
 (460) 
 (460)
 
 
 
 (162) 
 (162)
December 31, 2015 Balance$
 $770
 $
 $(3,554) $6,498
 $14,974
 $(135) $18,553
               
(Shares in millions)
Preferred
Stock
 
Common
Stock
 
Securities
Exchangeable
into Common
Stock
 
Treasury
Stock
        
December 31, 2012 Balance
 770
 
 63
        
Common stock issuance
 167
 
 1,069
 
 
 1,236
December 31, 2016 Balance$
 $937
 $(3,431) $7,446
 $12,672
 $(83) $17,541
Shares issued - stock-based                            
compensation
 
 
 (4)        
 
 117
 (50) 
 
 67
Shares repurchased
 
 
 14
        
 
 (11) 
 
 
 (11)
December 31, 2013 Balance
 770
 
 73
        
Shares issued - stock-based               
compensation
 
 
 (7)        
Shares repurchased
 
 
 29
        
Stock-based compensation
 
 
 (17) 
 
 (17)
Net loss
 
 
 
 (5,723) 
 (5,723)
Other comprehensive income
 
 
 
 
 21
 21
Dividends paid
 
 
 
 (170) 
 (170)
Common stock issuance
 
 
 
 
 
 
December 31, 2017 Balance$
 $937
 $(3,325) $7,379
 $6,779
 $(62) $11,708
             
(Shares in millions)
Preferred
Stock
 
Common
Stock
 
Treasury
Stock
        
December 31, 2014 Balance
 770
 
 95
        
 770
 95
        
Shares issued - stock-based                            
compensation
 
 
 (2)        
 
 (2)        
Shares repurchased
 
 
 
        
 
 
        
December 31, 2015 Balance
 770
 
 93
        
 770
 93
        
Shares issued - stock-based             
compensation
 
 (3)        
Shares repurchased
 
 
        
Common stock issuance
 167
 
        
December 31, 2016 Balance
 937
 90
        
Shares issued - stock-based             
compensation
 
 (3)        
Shares repurchased
 
 
        
Common stock issuance
 
 
        
December 31, 2017 Balance
 937
 87
 
      
The accompanying notes are an integral part of these consolidated financial statements.

70

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements




1. Summary of Principal Accounting Policies
We are a global energy 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 oil sands mining, bitumen transportation and upgrading, and marketing of synthetic crude oil and vacuum gas oil in Canada.
Principlesprinciples applied in consolidation – These consolidated financial statements include the accounts of our majority-owned, controlled subsidiaries. Investments in unincorporated joint ventures and undivided interests in certain operating assets are consolidated on a pro rata basis.
Equity method investmentinvestmentss – 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.
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. These
Equity method investments are assessed for impairment whenever changes in the facts and circumstances indicate a loss in value has occurred, if themay have occurred. When a loss is deemed to be other than temporary. When the losshave occurred and is deemed to be 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 net income. Differences in the basis of the investments and the separate net asset value of the investees, if any, are amortized into net income over the remaining useful lives of the underlying assets, except for the excess related to goodwill.
Reclassifications – 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 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.
As a result ofdiscussed above we closed on the sale of our Angola assetsCanadian business, which includes our Oil Sands Mining segment and our Norway business in 2014 (see Note 5), these businesses are reflected as discontinued operationsexploration stage in-situ leases in the periods priorsecond quarter 2017. The characteristics and composition of our North America E&P reporting segment remained unchanged and there was no effect on previously reported segment information. As all our remaining properties within the segment are located within the United States, we concluded that our North America E&P segment would be renamed United States E&P segment, effective June 30, 2017. During the year, no changes occurred to and including 2014.our International E&P segment. See Note 6 for further information on our reportable segments.
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.
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 – Revenues are recognized when products are shipped or services are provided to customers, title is transferred, the sales price is fixed or determinable and collectability is reasonably assured. We follow the sales method of
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


accounting for crude oil and natural gas production imbalances and would recognize a liability if our existing proved reserves were not adequate to cover an imbalance.imbalance. Imbalances have not been significant in the periods presented.
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. In Canada, mined bitumen is first processed through an upgrader and then sold as synthetic crude oil.
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.
Short-term Investments - Our short-term investments are comprised of bank time deposits with original maturities of greater than three months but less than twelve months. They are classified as held-to-maturity investments, which are recorded at amortized cost.
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. Uncollectible accountsWe routinely assess the collectability of receivable are reserved against the allowance for uncollectible accounts when it is determined the receivable will not be collected andbalances to determine if the amount of anythe reserve may be reasonably estimated.in allowance for doubtful accounts is sufficient.

71

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statementsreceivable - We hold two notes receivable from the sale of our Canadian business, which closed in the second quarter of 2017. Both notes receivable were initially recorded at fair value and are reported at amortized cost. The notes receivable are evaluated for collectability on an individual basis each reporting period, based on the financial condition of the debtor. No allowances for credit losses were established for the notes receivable as of December 31, 2017. See Note 5 for additional discussion.


Inventories – Crude oil and natural gas inventories are recorded at weighted average cost and carried at the lower of cost or marketnet realizable value. MaterialsSupplies and supplies inventoryother 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.indicate.
During the fourth quarter of 2015, we elected to change our accounting method related to our U.S. crude oil and natural gas inventories from last in, first out ("LIFO") method to weighted average cost. At December 31, 2015, this inventory represented $5 million of our total inventory value, see Note 10 to the consolidated financial statements for additional detail related to inventories. We believe this change is preferable as it provides consistent application of the cost basis for all categories of inventories across our worldwide portfolio, more accurately reflects the current value of inventory which provides for a better matching of expenses to revenues, and enhances comparability to our peers.
The effect of changing the method from LIFO to weighted average cost was immaterial for all current and prior periods. We recorded the cumulative effect of this change within our Consolidated Balance Sheets and Consolidated Statements of Income during the fourth quarter of 2015 and did not adjust previously reported periods. This resulted in an increase in our Inventories account of $2 million and a decrease in Production costs by $2 million. The change in method had an immaterial impact to income from continuing operations, with no change to basic or diluted earnings per share.
We may enter into a contract to sell a particular quantity and quality of crude oil at a specified location and datedate 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, interest ratecommodity locational risk, foreign currency risk and foreign currency exchangeinterest 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 and foreign currency forwards to manage our exposure to changes in the value of foreign currency denominated tax liabilities. 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 hedgesDerivatives that are not designated as hedges may include commodity derivatives used primarily to manage price riskand locational risks on the forecasted sale of crude oil and natural gas and synthetic crude oil that we produce. Changes in the fair value of derivatives not designated as hedges are recognized immediately in net income.
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


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 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 1514 to the consolidated financial statements.
Property, plant and equipment – We use the successful efforts method of accounting for oil and gas producing activities, which include bitumen mining and upgrading.activities.
Property acquisition costs – Costs to acquire mineral interests in oil and natural gas properties, or in oil sands mines, to drill and equip exploratory wells in progress and those that find proved reserves, and to drill and equip development wells and to construct or expand oil sands mines and upgrading facilities 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.

72

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


Depreciation, depletion and amortization – Capitalized costs to acquire oil and natural gas properties which include bitumen mining and upgrading facilities, 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 depreciateddepreciated on a straight-line basis over the estimated useful lives of the assets as summarized below.
Type of Asset Range of Useful Lives
Office furniture, equipment and computer hardware 34 to 15 years
Pipelines 10 to 40 years
Plants, facilities mine equipment and infrastructure 13 to 40 years

Impairments – We evaluateevaluate our oil and gas producing properties, including capitalized costs of exploratory wells and development costs, and our bitumen mining and upgrading facilities, 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.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, the expensethis amount is reported in exploration expenses.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 reportedreflected 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.
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


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.
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, which include our bitumen mining facilities. Asset retirement obligations for such facilities include costs to dismantle and relocate or dispose of production platforms, mine assets, 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 structure,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. Asset retirement obligations have not been recognized for certain of our international oil and gas producing facilities as we currently do not have a legal obligation associated with the retirement of those facilities. Asset retirement obligations have not been recognized for the removal of materials and equipment from or the closure of certain bitumen

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MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


upgrading assets because the fair value cannot be reasonably estimated since the settlement dates of the obligations are indeterminate.
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, which include our bitumen mining facilities, while accretion escalatesof 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 including future foreign source income,taxes, under which current and deferred tax credits, operating loss carryforwardsliabilities and management’s intent regarding the permanent reinvestment of the income from foreign subsidiaries.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
In July 2015, the FASB issued an update that requires an entity to measure inventory at the lower of cost and net realizable value. This excludes inventory measured using LIFO or the retail inventory method. This standard is effective for us inDuring the first quarter of 2017, and will be applied prospectively. Earlywe adopted the accounting standards update issued by the FASB in March 2016 pertaining to share-based payment transactions. As a result of this adoption, is permitted.all cash payments for withheld shares made to taxing authorities on the employees' behalf are presented within the financing activities section instead of the operating activities section of the statement of cash flows. We do not expectelected the retrospective method for adoption of this standard to have a significant impact on our consolidated resultsupdate and the change in the statement of operations, financial positioncash flows is not material for the years ended December 31, 2016 or cash flows.
In May 2015, the FASB issued2015. Excess tax benefits were classified as an update that removes the requirement to categorizeoperating activity within the fair value hierarchy all investments for which fair value is measured using the net asset value per share practical expedient. The amendment also removes certain disclosure requirements regarding all investments that are eligible to be measured using the net asset value per share practical expedient and only requires certain disclosures on those investments for which an entity elects to use the net asset value per share expedient. This standard is effective for us in the first quarterstatement of 2016 and will be appliedcash flows on a retrospective basis. Early adoption is permitted. This standard only modifies disclosure requirements;prospective basis beginning in 2017; as such, there will be no impact on our consolidated results of operations, financial position or cash flows.
In February 2015, the FASB issued an amendment to the guidanceprior periods were not adjusted. See Note 2 for determining whether an entity is a variable interest entity ("VIE"). The standard does not add or remove any of the five characteristics that determine if an entity is a VIE. However, it does change the manner in which a reporting entity assesses one of the characteristics. In particular, when decision-making over the entity’s most significant activities has been outsourced, the standard changes how a reporting entity assesses if the equity holders at risk lack decision making rights. This standard is effective for us for annual periods beginning after December 15, 2015 and early adoption is permitted, including in interim periods. 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.additional discussion.
In August 2014, the FASB issued an update that requires management to assess an entity’s ability to continue as a going concern by incorporating and expanding upon certain principles that are currently in U.S. auditing standards.  This standard is effective for us in the first quarter of 2017 and early adoption is permitted. 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.

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MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


2. Accounting Standards
Not Yet Adopted
In May 2014 and August 2015, the FASB issued an update that supersedes the existing revenue recognition requirements. This standard includes a five-step revenue recognition model to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the company expects to be entitled in exchange for those goods or services. Among other things, the standard requires enhanced disclosures about revenue, provides guidance for transactions that were not previously addressed comprehensively and improves guidance for multiple-element arrangements. This standard is effective for us in the first quarter of 2018 and shouldshall be applied retrospectively to each prior reporting period presented (“full retrospective method”) or with the cumulative effect of initially applying the update recognized at the date of initial application.application (“modified retrospective method”). We will adopt this new standard in the first quarter of 2018 using the modified retrospective method. The adoption of this ASU will not have a material impact on our consolidated results of operations, financial position or cash flows. However, as a result of this standard we will change our presentation of marketing revenues and marketing expenses from the current gross presentation to a net presentation for a portion of our international contracts. For the years ended December 31, 2017 and 2016, we expect the impact of this change to be a reduction of approximately $130 million and $100 million, respectively, in marketing revenue and expenses in our consolidated results of operations. We will provide the disclosures required by this standard, such as key sources of revenues from transactions with customers, disaggregated revenue information, and significant accounting estimates and judgments, beginning in the first quarter of 2018.
In March 2017, the FASB issued a new accounting standards update that will change how employers that sponsor defined pension and/or other postretirement benefit plans present the net periodic benefit cost in the income statement. Employers will 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. Only the service cost component will be eligible for capitalization in assets. We will adopt this standard in the first quarter of 2018 on a retrospective basis, and will reclassify certain amounts from general and administrative expense to the exploration, production and our new other net periodic benefit costs expense categories on our consolidated statements of income.
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. We will adopt this standard during the first quarter of 2018 on a retrospective basis with no significant impact on our consolidated results of operations, financial position or 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, entities will 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. We will adopt this standard in the first quarter of 2018 on a retrospective basis and do not expect the adoption of this standard to have a significant impact on our consolidated results of operations, financial position or cash flows.
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. We will adopt this standard in the first quarter of 2018 using the modified retrospective approach with no material impact on our consolidated results of operations, financial position or cash flows.
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 an entity 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. We will adopt this standard in the first quarter of 2018 on a prospective basis. Since we adopted the standard on a prospective basis, adoption of this standard will not have a significant impact on our consolidated results of operations, financial position or cash flows for prior periods.
In January 2016, the FASB issued an accounting standards update that addresses certain aspects of recognition, measurement, presentation, and disclosure of financial instruments. We plan to adopt this standard in the first quarter of 2018
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


and do not expect the adoption of this standard to have a significant impact on our consolidated results of operations, financial position or cash flows.
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. While we will have to recognize a right of use asset and lease liability on the adoption date, we continue to evaluate the provisions of this accounting standards update and assessing the effects it will have on our consolidated results of operations, financial position or cash flows.
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. Early adoption is permitted in any interim or annual period. The amendment mandates modified retrospective adoption when accounting for hedge relationships in effect as of the adoption date. We are evaluating the provisions of this accounting standards update, including transition requirements, and are assessing the impact it may have on our results of operations, financial position, or cash flows.
In January 2017, the FASB issued a new accounting standards update that eliminates the requirement to calculate the implied fair value of the goodwill (i.e., Step 2 of goodwill impairment test under the current guidance) to measure a goodwill impairment charge. The standard will require entities to record an impairment charge based on the excess of a reporting unit’s carrying amount over its fair value (i.e., 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. Since we will adopt the standard on a prospective basis, we do not expect an impact on our consolidated results of operations, financial position or cash flows for prior periods.
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
In NovemberMarch 2016, the FASB issued a new accounting standards update that changes several aspects of accounting for share-based payment transactions, including a requirement to recognize all excess tax benefits and tax deficiencies as income tax expense or benefit in the income statement, classification of awards as either equity or liabilities, and classification on the statement of cash flows. This standard was effective for us in the first quarter of 2017. The new standard requires a company to make a policy election on how it accounts for forfeitures; we elected to continue estimating forfeitures using the same methodology practiced prior to adoption of this standard. See Note 1 for the impact this standard has on the presentation of our financial statements.
In July 2015, the FASB issued an update that requires an entity to classify deferred income tax liabilities and assets as noncurrent in a classified statementmeasure inventory at the lower of financial position. The amendments arecost or net realizable value. This excludes inventory measured using LIFO or the retail inventory method. This standard was effective for us in the first quarter of 2017, and early adoption is permitted. We elected to early adopt these amendments in the fourth quarter of 2015 on a prospective basis.was applied prospectively. Adoption of this standard did not have a significant impact on our consolidated results of operations, financial position or cash flows.
In April 2015, the FASB issued an update that requires debt issuance costs to be presented in the balance sheet as a direct reduction from the associated debt liability. This standard is effective for us in the first quarter of 2016 and early adoption is permitted. We elected to early adopt these amendments in the fourth quarter of 2015 on a retrospective basis. Adoption of this standard did not have a significant impact on our consolidated results of operations, financial position or cash flows.
In April 2014, the FASB issued an amendment to accounting standards that changes the criteria for reporting discontinued operations while enhancing related disclosures. Under the amendment, only disposals representing a strategic shift in operations should be presented as discontinued operations. Those strategic shifts should have a major effect on the organization’s operations and financial results. Expanded disclosures about the assets, liabilities, income and expenses of discontinued operations are required.  In addition, disclosure of the pretax income attributable to a disposal of a significant part of an organization that does not qualify for discontinued operations reporting will be made in order to provide users with information about the ongoing trends in an organization’s results from continuing operations.  The amendments were effective for us in the first quarter of 2015. Adoption of this standard did not have a significant impact on our consolidated results of operations, financial position or cash flows.
3.Variable Interest Entities
The owners of the AOSP, in which we hold a 20% undivided interest, contracted with a wholly owned subsidiary of a publicly traded Canadian limited partnership ("Corridor Pipeline") to provide materials transportation capabilities among the Muskeg River and Jackpine mines, the Scotford upgrader and markets in Edmonton. The contract, originally signed in 1999 by a company we acquired, allows each holder of an undivided interest in the AOSP to ship materials in accordance with its undivided interest. Costs under this contract are accrued and recorded on a monthly basis, with a $2 million current liability recorded at December 31, 2015 and $3 million at December 31, 2014. Under this agreement, the AOSP absorbs all of the operating and capital costs of the pipeline. Currently, no third-party shippers use the pipeline. Should shipments be suspended, by choice or due to force majeure, we remain responsible for the portion of the payments related to our undivided interest for all remaining periods. The contract expires in 2029; however, the shippers can extend its term perpetually. This contract qualifies as a variable interest contractual arrangement and the Corridor Pipeline qualifies as a VIE. We hold a variable interest but are not the primary beneficiary because our shipments are only 20% of the total; therefore the Corridor Pipeline is not consolidated by us. Our maximum exposure to loss as a result of our involvement with this VIE is the amount we expect to pay over the contract term, which was $447 million as of December 31, 2015. The liability on our books related to this contract at any given time will reflect amounts due for the immediately previous month’s activity, which is substantially less than the maximum exposure over the contract term. We have not provided financial assistance to Corridor Pipeline and we do not have any guarantees of such assistance in the future.
4. Acquisitions
2014 - North America E&P
In the fourth quarter of 2014, we acquired additional acres in the SCOOP, at a cost of $58 million after final settlement adjustments.

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MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


3.    Income (Loss) 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 years, provided the effect is not antidilutive. The per share calculations below exclude 11 million, 13 million and 13 million stock options in 2017, 2016 and 2015 that were antidilutive.
 Year Ended December 31,
(In millions, except per share data)2017 2016 2015
Income (loss) from continuing operations$(830) $(2,087) $(1,701)
Income (loss) from discontinued operations(4,893) (53) (503)
Net income (loss)$(5,723) $(2,140) $(2,204)
      
Weighted average common shares outstanding850
 819
 677
Per basic share: 
  
  
Income (loss) from continuing operations$(0.97) $(2.55) $(2.51)
Income (loss) from discontinued operations$(5.76) $(0.06) $(0.75)
Net income (loss)$(6.73) $(2.61) $(3.26)
Per diluted share:     
Income (loss) from continuing operations$(0.97) $(2.55) $(2.51)
Income (loss) from discontinued operations$(5.76) $(0.06) $(0.75)
Net income (loss)$(6.73) $(2.61) $(3.26)

4. Acquisitions
2017 - United States E&P
In the thirdfourth quarter of 2014,2017, we acquired acreage in the Oklahoma Resource Basins at a costclosed on our acquisition of $68 million after final settlement adjustments.
2013 - North America E&P
In July 2013, we acquired additional acreage in the Eagle FordNorthern Delaware basin of New Mexico from a private seller for $63 million in a transaction valued at $97 million, including a carried interest of $23 million which was fully satisfied in 2014. The transaction wascash, subject to post-closing adjustments. We accounted for this transaction as a business combination,an asset acquisition, allocating the purchase price to unproved property within property, plant and equipment.
In the second quarter of 2017, we closed on our acquisitions of approximately 91,000 net acres in the Permian basin, including over 70,000 net acres in the Northern Delaware basin of New Mexico. On May 1, 2017, we closed on our acquisition with BC Operating, Inc. and other entities for $1.1 billion in cash, subject to post-closing adjustments, to acquire approximately 70,000 net surface acres and current production of approximately 5,000 net barrels of oil equivalent per day. On June 1, 2017, we closed on our acquisition with Black Mountain Oil & Gas and other private sellers for approximately $700 million in cash, subject to post-closing adjustments, to acquire approximately 21,000 net surface acres. The purchase price for these acquisitions was paid with cash on hand. We accounted for these transactions as asset acquisitions, with substantially all of the entire up-front cash consideration of $74 millionpurchase price allocated to unproved property within property, plant and equipment.
2016 - United States E&P
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.

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


5. Dispositions
Oil Sands Mining Segment
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 (“CNRL”) for $2.5 billion, excluding closing adjustments. Under the terms of the agreement, $1.8 billion was paid to us upon closing and the remaining proceeds will be paid in the first quarter of 2018. At closing we received two notes receivable for the remaining proceeds, each with a face value of $375 million. We recorded these notes receivable at fair value, see Note 14 for fair value measurements. Our notes receivable are with 10084751 Canada Limited (“Canada Limited”), an affiliate of Shell Canada Limited, and CNRL. The Canada Limited note receivable is guaranteed by Shell Canada Limited and the CNRL note receivable is guaranteed by Toronto Dominion Bank. In the first quarter of 2017, we recorded an after-tax non-cash impairment charge of $4.96 billion primarily related to the property, plant and equipment atof our Canadian business. As the acquisition date.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 second quarter results of operations from our Canadian business that were recorded in our financial statements but transferred to the buyer upon closing.
The fair values of assets acquired and liabilities assumedOur Canadian business is reflected as discontinued operations in the business combination were measured primarily using anconsolidated statements of income approach, specifically utilizing a discountedand the consolidated statements of cash flow analysis.flows for all periods presented. The estimated fair values were based on significant inputs not observablefollowing table contains select amounts reported in the market, and therefore represent Level 3 measurements. Significant inputs included estimated reserve volumes, the expected future production profile, estimated commodity prices and assumptions regarding future operating and development costs and a discount rate of approximately 10%. The pro forma impact of these transactions, individually and in the aggregate, is not material to our consolidated statements of income as discontinued operations:
  Year Ended December 31,
(In millions) 2017 2016 2015
Total sales and other revenues and other income $431
 $863
 $908
Net gain (loss) on disposal of assets (43) 
 
Total revenues and other income 388
 863
 908
Costs and expenses:      
Production expenses 254
 601
 715
Exploration expenses 
 7
 347
Depreciation, depletion and amortization 40
 239
 236
Impairments 6,636
 
 31
Other 25
 87
 98
Total costs and expenses 6,955
 934
 1,427
Pretax income (loss) from discontinued operations (6,567) (71) (519)
Provision (benefit) for income taxes (1,674) (18) (16)
Income (loss) from discontinued operations $(4,893) $(53) $(503)
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


The following table presents the carrying value of the major categories of assets and liabilities of our Canadian business reported as discontinued operations and other non-core international assets and liabilities from continuing operations, that are reflected as held for any periods presented.
5. Dispositionssale on our consolidated balance sheets at December 31, 2017 and December 31, 2016:
2015 -
  December 31, December 31,
(In millions) 2017 2016
Assets held for sale    
Current assets:    
Cash and cash equivalents $
 $2
Accounts receivables 
 129
Inventories 
 91
Other 
 4
Total current assets held for sale—discontinued operations 
 226
Total current assets held for sale—continuing operations 11
 1
Total current assets held for sale $11
 $227
     
Noncurrent assets:    
Property, plant and equipment, net $
 $8,991
Other 
 106
Total noncurrent assets held for sale—discontinued operations 
 9,097
Total noncurrent assets held for sale—continuing operations 55
 1
Total noncurrent assets held for sale $55
 $9,098
     
Liabilities associated with assets held for sale    
Current liabilities:    
Accounts payable $
 $111
Other 
 10
Total current liabilities held for sale—discontinued operations 
 121
Total current liabilities held for sale—continuing operations 
 
Total current liabilities held for sale $
 $121
     
Noncurrent liabilities:    
Asset retirement obligations $
 $95
Deferred tax liabilities 
 1,669
Other 
 20
Total noncurrent liabilities held for sale—discontinued operations 
 1,784
Total noncurrent liabilities held for sale—continuing operations 2
 7
Total noncurrent liabilities held for sale $2
 $1,791
United States E&P Segment
As disclosed above, we closed on the sale of our Canadian business in May of 2017. This sale included interests in our exploration stage in-situ leases which were included within our historically named North America E&P SegmentSegment. See Note 6 for further detail on our segments. These interests have been reflected as discontinued operations and are included within the disclosure above.
In July 2017, we entered into an agreement to sell certain conventional assets in Oklahoma. We closed on the sale in September 2017 for proceeds of $25 million, and recognized a pre-tax gain of $21 million.
In September 2016, we entered into an agreement to sell certain non-operated CO2 and waterflood assets in West Texas and New Mexico. The sale closed in late October for proceeds of $235 million, and we recognized a total pre-tax gain of $63
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


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.
In April 2016, we announced the sale of our Wyoming upstream and midstream assets. During the second quarter, we received proceeds of approximately $690 million and recorded a pre-tax gain of $266 million with the remaining asset sales closing in November 2016 for proceeds of $155 million, excluding closing adjustments. A pre-tax gain of $38 million was recognized in the fourth quarter 2016.
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.
In November 2015, we entered into an agreement to sell 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. The transaction closed in December 2015, excluding the Neptune field, for proceeds of $111 million. A $228 million pretax gain was recorded in the fourth quarter of 2015. Assets held for sale in the December 31, 2015 consolidated balance sheet were related to the Neptune field that was pending at that date and included $31 million in total assets and $54 million of total liabilities. The Neptune field transaction closed during the first quarter of 2016 for cash proceeds of $4 million.     
In August 2015, we closed the sale of our East Texas, North Louisiana and Wilburton, Oklahoma natural gas assets for proceeds of $100 million and recorded a pretax loss of $1 million. During the second quarter of 2015, we recorded a non-cash impairment charge of $44 million related to these assets (see Note 15)14).
2015 - International E&P Segment
In Septemberthe third quarter of 2017, we entered into separate agreements to sell certain non-core properties in our International E&P segment for combined proceeds of $53 million, before closing adjustments. We closed on one of the asset sales in the second half of 2017 and recognized no net pre-tax gain or loss on sale. The remaining asset sale is expected to close during 2018 and is classified as held for sale in the consolidated balance sheet as of December 31, 2017, with total assets of $66 million and total liabilities of $2 million. See Note 10 for further detail on impairment expenses recognized concurrently with these agreements.
In the third quarter of 2015, we entered into agreements to sell our East Africa exploration acreage in Ethiopia and Kenya. A pretax loss of $109 million was recorded in the third quarter of 2015. The KenyaThis transaction closed in February 2016 and the Ethiopia transaction is expected to close induring the first quarter of 2016. Cash proceeds for both transactions are expected to be $10 million, before closing adjustments.
2014 - North America E&P Segment
In June 2014, we closed the sale of non-core acreage located in the far northwest portion of the Williston Basin for proceeds of $90 million. A pretax loss of $91 million was recorded in the second quarter of 2014.
2014 - International E&P Segment
In June 2014, we entered into an agreement to sell our Norway business, including the operated Alvheim FPSO, 10 operated licenses and a number of non-operated licenses on the Norwegian Continental Shelf in the North Sea.  The transaction closed in the fourth quarter of 2014 for proceeds of $2.1 billion, before netting $589 million cash transferred to the buyer. A $976 million after-tax gain on the sale of Norway business was recorded in the fourth quarter of 2014. Included in this after-tax gain is a deferred tax benefit reflecting our ability to utilize foreign tax credits that otherwise would have needed a valuation allowance.
Our Norway business is reflected as discontinued operations in the consolidated statements of income and the consolidated statements of cash flows for the periods prior to and including 2014. Select amounts reported in discontinued operations were as follows:
 Year Ended December 31,
(In millions)2014 2013
Revenues applicable to discontinued operations$1,981
 $3,176
Pretax income from discontinued operations$1,693
 $2,537
Pretax gain on disposition of discontinued operations$1,406
 $

76

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


In the first quarter of 2014, we closed the sales of our 10% non-operated working interests in the Production Sharing Contracts and Joint Operating Agreements for Angola Blocks 31 and 32 for aggregate proceeds of approximately $2 billion. A $532 million after-tax gain on the sale of our Angola assets was recorded in 2014. Included in this after-tax gain is a deferred tax benefit reflecting our ability to utilize foreign tax credits that otherwise would have needed a valuation allowance.
Our Angola operations are reflected as discontinued operations in the consolidated statements of income and the consolidated statements of cash flows for the periods prior to and including 2014. Select amounts reported in discontinued operations were as follows:
 Year Ended December 31,
(In millions) 2014 2013
Revenues applicable to discontinued operations $58
 $361
Pretax income from discontinued operations $51
 $247
Pretax gain on disposition of discontinued operations $426
 $
2013 - North America E&P Segment
In June 2013, we closed the sale of our interests in the DJ Basin for proceeds of $19 million. A pretax loss of $114 million was recorded in the second quarter of 2013.
In February 2013, we conveyed our interests in the Marcellus natural gas shale play to the operator. A $43 million pretax loss was recorded in the first quarter of 2013.
In February 2013, we closed the sale of our interest in the Neptune gas plant, located onshore Louisiana, for proceeds of $166 million. A $98 million pretax gain was recorded in the first quarter of 2013.
In January 2013, we closed the sale of our assets in Alaska, for proceeds of $195 million, subject to a six-month escrow of $50 million which was collected in July 2013. After closing adjustments were made in the second quarter of 2013, the pretax gain on this sale was $55 million.
2013 - International E&P Segment
In the fourth quarter of 2013, we transferred our 45% working interest and operatorship in the Safen block in the Kurdistan Region of Iraq at a pretax loss of $17 million.

6.    Income (Loss) 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 years and stock appreciation rights in 2013, provided the effect is not antidilutive. The per share calculations below exclude 13 million, 4 million and 5 million stock options in 2015, 2014 and 2013 that were antidilutive.
 Year Ended December 31,
(In millions, except per share data)2015 2014 2013
Income (loss) from continuing operations$(2,204) $969
 $931
Discontinued operations
 2,077
 822
Net income (loss)$(2,204) $3,046
 $1,753
      
Weighted average common shares outstanding677
 680
 705
Effect of dilutive securities
 3
 4
Weighted average common shares, diluted677
 683
 709
Per basic share: 
  
  
Income (loss) from continuing operations$(3.26) $1.42
 $1.32
Discontinued operations$
 $3.06
 $1.17
Net income (loss)$(3.26) $4.48
 $2.49
Per diluted share:     
Income (loss) from continuing operations$(3.26) $1.42
 $1.31
Discontinued operations$
 $3.04
 $1.16
Net income (loss)$(3.26) $4.46
 $2.47

77

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


7.6. Segment Information
We have threetwo reportable operating segments.  Each of these segments is organized and managed based upon both geographic location and the nature of the products and services it offers:offers.
North AmericaUnited States E&P ("N.A.U.S. E&P") – explores for, produces and markets crude oil and condensate, NGLs and natural gas in North America;the United States
International E&P ("Int'l E&P") – explores for, produces and markets crude oil and condensate, NGLs and natural gas outside of North Americathe United States and produces and markets products manufactured from natural gas, such as LNG and methanol, in E.G.; and
Oil Sands Mining (“OSM”) – mines, extracts and transports bitumen from oil sands deposits in Alberta, Canada, and upgrades the bitumen to produce and market synthetic crude oil and vacuum gas oil.
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 from continuing operations excluding(loss) which excludes certain items not allocated to segments, net of income taxes, attributable to the operating segments. A portion of our corporate and operations support general and administrative 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. GainsAdditionally, items which affect comparability such as gains or losses on dispositions, certain impairments, change in tax expense associated with a tax rate change, changes in our valuation allowance, unrealized gains or losses on crude oil derivative instruments, pension settlement losses or other items that affect comparability (as determined by the CODM) also are not allocated to operating segments.
As discussed in Note 5, we closed on the sale of our Angola assetsCanadian business, which includes our Oil Sands Mining segment and exploration stage in-situ leases, in the firstsecond quarter of 2014 and our Norway2017. The Canadian business in the fourth quarter of 2014, and both areis reflected as discontinued operations and is excluded from the Internationalsegment information in all periods presented. Additionally, we renamed our North America E&P segment to United States E&P segment effective June 30, 2017 in all periods presented. See Note 1 for 2014 and 2013.further information.
Year Ended December 31, 2015  Not Allocated  
Year Ended December 31, 2017 Not Allocated  
(In millions)N.A. E&P Int'l E&P OSM to Segments TotalU.S. E&P Int'l E&P to Segments Total
Sales and other operating revenues$3,358
 $728
 $815
 $50
(c) 
$4,951
$3,138
 $1,154
 $(81)
(b) 
$4,211
Marketing revenues396
 103
 72
 
 571
29
 133
 
 162
Total revenues3,754
 831
 887
 50
 5,522
3,167
 1,287
 (81) 4,373
Income (loss) from equity method investments
 157
 
 (12)
(d) 
145
Income from equity method investments
 256
 
 256
Net gain on disposal of assets and other income24
 27
 21
 122
(e) 
194
13
 6
 117
(c) 
136
Less:                
Production expenses724
 255
 715
 
 1,694
476
 229
 1
 706
Marketing costs401
 99
 69
 
 569
36
 132
 
 168
Exploration expenses362
 101
 
 855
(f) 
1,318
Other operating354
 77
 
 431
Exploration154
 5
 250
(d) 
409
Depreciation, depletion and amortization2,377
 295
 236
 49
 2,957
2,011
 328
 33
 2,372
Impairments2
 
 5
 745
(g) 
752
4
 
 225
(e) 
229
Other expenses (a)
462
 92
 34
 440
(h) 
1,028
Taxes other than income215
 
 18
 1
 234
173
 
 10
 183
General and administrative119
 32
 249
(f) 
400
Net interest and other
 
 
 267
 267

 
 270
(g) 
270
Loss on early extinguishment of debt
 
 51
(h) 
51
Income tax provision (benefit)(279) 61
 (56) (480)
(i) 
(754)1
 372
 3
 376
Segment income (loss)/Income (loss) from continuing operations$(486) $112
 $(113) $(1,717) $(2,204)
Capital expenditures (b)
$2,553
 $368
 $(10) $25
 $2,936
Segment income (loss) / Income (loss) from continuing operations$(148) $374
 $(1,056) $(830)
Capital expenditures (a)
$2,081
 $42
 $27
 $2,150
(a)
Includes other operating expenses and general and administrative expenses.
(b) 
Includes accruals.
(c)(b) 
Unrealized gainloss on crude oilcommodity derivative instruments.
(c)
Primarily related to sale of certain conventional assets in Oklahoma and Colorado. (See Note 5).
(d)Primarily related to unproved property impairments associated with certain non-core properties within our International E&P segment. (See Note 10).
(e)
Primarily related to proved property impairments associated with certain non-core properties within our International E&P segment. (See Note 10).
(f)
Includes pension settlement loss of $32 million (see Note 17).
(g) Includes a gain of $47 million resulting from the termination of our forward starting interest rate swaps. (See Note 13.)
(h) Primarily related to the make-whole call provisions paid upon redemption of our senior unsecured notes. (See Note 15.)



MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


Year Ended December 31, 2016 Not Allocated  
(In millions)U.S. E&P Int'l E&P to Segments Total
Sales and other operating revenues$2,375
 $665
 $(110)
(b) 
$2,930
Marketing revenues135
 105
 
 240
Total revenues2,510
 770
 (110) 3,170
Income (loss) from equity method investments
 175
 
 175
Net gain on disposal of assets and other income28
 32
 382
(c) 
442
Less:       
Production expenses486
 226
 
 712
Marketing costs142
 103
 
 245
Other operating328
 43
 113
(d) 
484
Exploration127
 17
 179
(e) 
323
Depreciation, depletion and amortization1,835
 276
 45
 2,156
Impairments20
 
 47
(f) 
67
Taxes other than income149
 
 2
 151
General and administrative94
 35
 352
(g) 
481
Net interest and other
 
 332
 332
Income tax provision (benefit)(228) 49
 1,102
(h) 
923
Segment income (loss) / Income (loss) from continuing operations$(415) $228
 $(1,900) $(2,087)
Capital expenditures (a)
$936
 $82
 $18
 $1,036
(a)
Includes accruals.
(b)
Unrealized loss on commodity derivative instruments.
(c)
Primarily related to net gain on disposal of assets(see Note 5).
(d)
Includes termination payment on our Gulf of Mexico deepwater drilling rig commitment of $113 million.
(e) Primarily related to impairments associated with decision to not drill remaining Gulf of Mexico undeveloped leases (See Note 10).
(f)
Proved property impairments (see Note 10).
(g)
Includes pension settlement loss of $103 million and severance related expenses associated with workforce reductions of $8 million (see Note 17).
(h)
Increased valuation allowance on certain of our deferred tax assets $1,346 million (see Note 7).

Year Ended December 31, 2015 Not Allocated  
(In millions)U.S. E&P Int'l E&P to Segments Total
Sales and other operating revenues$3,358
 $728
 $50
(b) 
$4,136
Marketing revenues396
 103
 
 499
Total revenues3,754
 831
 50
 4,635
Income from equity method investments
 157
 (12)
(c) 
145
Net gain on disposal of assets and other income24
 27
 122
(d) 
173
Less:       
Production expenses724
 255
 
 979
Marketing costs401
 99
 
 500
Other operating335
 48
 27
 410
Exploration314
 101
 556
(e) 
971
Depreciation, depletion and amortization2,377
 295
 49
 2,721
Impairments2
 
 719
(f) 
721
Taxes other than income215
 
 1
 216
General and administrative127
 44
 417
(g) 
588
Net interest and other
 
 286
 286
Income tax provision (benefit)(265) 61
 (534) (738)
Segment income (loss) / Income (loss) from continuing operations$(452) $112
 $(1,361) $(1,701)
Capital expenditures (a)
$2,553
 $368
 $25
 $2,946
(a)
Includes accruals.
(b)
Unrealized gain on commodity derivative instruments.
(c) 
Partial impairment of investment in equity method investee (See Note 15)14).
(e)(d) 
Primarily related to gain on sale of our properties and interests in the Gulf of Mexico, partially offset by the loss on sale of East Africa exploration acreage (see Note 5).
(f)(e) Unproved property impairments associated with lower forecasted commodity prices and change in conventional exploration strategy (See Note 13)10).
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


(g)(f) 
GoodwillIncludes goodwill impairment (see Note 14)12) and proved property impairments (see Note 15)10).
(h)(g)  
Includes pension settlement loss of $119 million (see Note 20)17) and severance related expenses associated with workforce reductions of $55 million.
(i)
Includes $135 million of deferred tax expense related to Alberta provincial corporate tax rate increase (see Note 9).


78

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


Year Ended December 31, 2014  Not Allocated  
(In millions)N.A. E&P Int'l E&P OSM to Segments Total
Sales and other operating revenues$5,770
 $1,410
 $1,556
 $
 $8,736
Marketing revenues1,839
 219
 52
 
 2,110
Total revenues7,609
 1,629
 1,608
 
 10,846
Income from equity method investments
 424
 
 
 424
Net gain (loss) on disposal of assets and other income23
 57
 4
 (96)
(c) 
(12)
Less:         
Production expenses891
 386
 969
 
 2,246
Marketing costs1,836
 217
 52
 
 2,105
Exploration expenses608
 185
 
 
 793
Depreciation, depletion and amortization2,342
 269
 206
 44
 2,861
Impairments23
 
 
 109
(d) 
132
Other expenses (a)
473
 197
 54
 392
(e) 
1,116
Taxes other than income385
 
 20
 1
 406
Net interest and other
 
 
 238
 238
Income tax provision (benefit)381
 288
 76
 (353) 392
Segment income/Income from continuing operations$693
 $568
 $235
 $(527) $969
Capital expenditures (b)
$4,698
 $534
 $212
 $51
 $5,495
(a)     Includes other operating expenses and general and administrative expenses.
(b)    Includes accruals.
(c)    Primarily related to the sale of non-core acreage in our North America E&P segment ( See Note 5).
(d)    Proved Property impairments (See Note 15)
(e)    Includes pension settlement loss of $99 million (See Note 20).

Year Ended December 31, 2013  Not Allocated  
(In millions)N.A. E&P Int'l E&P OSM to Segments Total
Sales and other operating revenues$5,068
 $2,654
 $1,576
 $(52)
(c) 
$9,246
Marketing revenues1,797
 264
 18
 
 2,079
Total revenues6,865
 2,918
 1,594
 (52) 11,325
Income from equity method investments
 427
 
 (4)
(d) 
423
Net gain (loss) on disposal of assets and other income12
 50
 5
 (32)
(e) 
35
Less:         
Production expenses797
 359
 1,000
 
 2,156
Marketing costs1,796
 262
 18
 
 2,076
Exploration expenses725
 166
 
 
 891
Depreciation, depletion and amortization1,927
 331
 218
 24
 2,500
Impairments41
 
 
 55
(f) 
96
Other expenses (a)
420
 161
 66
 401
(g) 
1,048
Taxes other than income318
 
 22
 5
 345
Net interest and other
 
 
 278
 278
Income tax provision (benefit)324
 1,358
 69
 (289) 1,462
Segment income/Income from continuing operations$529
 $758
 $206
 $(562) $931
Capital expenditures (b)
$3,649
 $456
 $286
 $58
 $4,449
(a)     Includes other operating expenses and general and administrative expenses.
(b)    Includes accruals.
(c)    Unrealized loss on crude oil derivative instruments (see Note 16).
(d)    EGHoldings impairment (See Note 15).
(e)    Related to the disposal of assets from our North America E&P Segment (see Note 5).
(f)    Proved property impairments (see Note 15).
(g)    Includes pension settlement loss of $45 million (see Note 20).
Revenues from external customers are attributed to geographic areas based upon selling location. The following summarizes revenues from external customers by geographic area.

79

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


Year Ended December 31,Year Ended December 31,
(In millions)2015 2014 20132017 2016 2015
United States$3,804
 $7,609
 $6,813
$3,086
 $2,400
 $3,804
Canada887
 1,608
 1,594
Libya(a)

 244
 1,106
Equatorial Guinea530
 444
 444
Libya431
 54
 
U.K.289
 263
 380
Other international831
 1,385
 1,812
37
 9
 7
Total revenues$5,522
 $10,846
 $11,325
$4,373
 $3,170
 $4,635
(a)
See Note 12 for discussion of Libya operations.
In 2015,2017, sales to Irving Oil and Shell OilVitol and each of their respective affiliates accounted for approximately 13% and 11%10% of our total revenues. In 2014,2016, 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. In 2015, sales to Shell Oil and its affiliates accounted for approximately 10% of our total revenues. In 2013, Statoil, the purchaser of the majority of our Libyan crude oil, accounted for approximately 10% of our total
The following summarizes revenues
Revenues by product line were:line.
Year Ended December 31,Year Ended December 31,
(In millions)2015 2014 20132017 2016 2015
Crude oil and condensate$3,963
 $8,170
 $8,688
$3,477
 $2,605
 $3,963
Natural gas liquids203
 371
 313
338
 198
 203
Natural gas464
 693
 693
510
 356
 464
Synthetic crude oil781
 1,525
 1,542
Other111
 87
 89
48
 11
 5
Total revenues$5,522
 $10,846
 $11,325
$4,373
 $3,170
 $4,635

The following summarizes property, plant and equipment and equity method investments.
December 31,December 31,
(In millions)2015 20142017 2016
United States$15,353
 $16,518
$15,971
 $14,272
Canada9,197
 9,802
Equatorial Guinea1,917
 1,949
1,582
 1,794
Other international1,597
 1,884
959
 1,592
Total long-lived assets$28,064
 $30,153
$18,512
 $17,658


7. Income Taxes
Income (loss) before tax expense for continuing operations was:
80

 Year Ended December 31,
(In millions) 2017 2016 2015
United States $(783) $(1,449) $(2,384)
Foreign 329
 285
 (55)
Total $(454) $(1,164) $(2,439)

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


8. Other Items
Net interest and other
 Year Ended December 31,
(In millions)2015 2014 2013
Interest:     
Interest income$9
 $7
 $5
Interest expense(358) (309) (319)
Income on interest rate swaps11
 12
 9
Interest capitalized26
 20
 12
Total interest(312) (270) (293)
Other:     
Net foreign currency gains23
 21
 14
Other22
 11
 1
Total other45
 32
 15
Net interest and other$(267) $(238) $(278)
Foreign currency – Aggregate foreign currency gains were included in the consolidated statements of income as follows:
 Year Ended December 31,
(In millions)2015 2014 2013
Net interest and other$23
 $21
 $14
Provision for income taxes(11) (12) (2)
Aggregate foreign currency gains$12
 $9
 $12


9. Income Taxes
Income tax provisions (benefits) for continuing operations were:
Year Ended December 31,Year Ended December 31,
2015 2014 20132017 2016 2015
(In millions)Current Deferred Total Current Deferred Total Current Deferred TotalCurrent Deferred Total Current Deferred Total Current Deferred Total
Federal$(43) $(687) $(730) $15
 $62
 $77
 $83
 $(47) $36
$(32) $41
 $9
 $2
 $836
 $838
 $(41) $(684) $(725)
State and local(8) (18) (26) 8
 (58) (50) 39
 (6) 33
(14) 2
 (12) 2
 8
 10
 (8) (18) (26)
Foreign103
 (101) 2
 281
 84
 365
 1,374
 19
 1,393
483
 (104) 379
 91
 (16) 75
 115
 (102) 13
Total$52
 $(806) $(754) $304
 $88
 $392
 $1,496
 $(34) $1,462
$437
 $(61) $376
 $95
 $828
 $923
 $66
 $(804) $(738)
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:
 Year Ended December 31,
 2015 2014 2013
Statutory rate applied to income (loss) from continuing operations before income taxes(35)% 35 % 35 %
Effects of foreign operations, including foreign tax credits(2) (6) 26
Change in permanent reinvestment assertion
 (19) 
Adjustments to valuation allowances3
 21
 (1)
Change in tax law5
 
 
Goodwill impairment4
 
 
Other
 (2) 1
Effective income tax expense (benefit) rate on continuing operations(25)% 29 % 61 %

81

MARATHON OIL CORPORATION
  Year Ended December 31,
(In millions) 2017 2016 2015
Total pre-tax income (loss) from continuing operations $(454) $(1,164) $(2,439)
Total income tax expense (benefit) $376
 $923
 $(738)
Effective income tax expense (benefit) rate on continuing operations 83% 79% (30)%
       
Income taxes at the statutory tax rate of 35% (a)
 $(159) $(407) $(854)
Effects of foreign operations 140
 47
 (55)
Adjustments to valuation allowances 446
 1,270
 95
State income taxes (19) 9
 (15)
Tax law change (35) 6
 (3)
Goodwill impairment 
 
 94
Other federal tax effects 3
 (2) 
Income tax expense (benefit) on continuing operations $376
 $923
 $(738)
Notes(a) Includes income tax benefits primarily related to Consolidated Financial Statementsour U.S. federal income taxes where we have maintained a full valuation allowance since December 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 appears in the "Not Allocated to Segments" column of the tables in Note 7.6.
Effects of foreign operations – The effects of foreign operations onincreased our effective tax rate decreasedexpense in 20152017, 2016, and 2014 as compared to 2013,2015 due to a shift inthe mix of pretax income mix between high and low tax jurisdictions. This isincrease primarily relatedrelates to decreasedincreased sales volumes in Libya in 2015 and 2014during 2017 where the tax rate is in excess of 90%93.5%. Excluding Libya, the effective tax rates on continuing operations would be an expense of 5% in 2017, an expense of 79% in 2016, and a benefit of 25%29% in 2015 and expense of 27% and 38% in 2014 and 2013.
Change in permanent reinvestment assertion – In the second quarter of 2015, we reviewed our operations and concluded that we do not have the same level of capital needs outside the U.S. as previously expected. Therefore, we no longer intend for previously unremitted foreign earnings of approximately $1 billion associated with our Canadian operations to be permanently reinvested outside the U.S. We anticipate foreign tax credits associated with these Canadian earnings would be sufficient to offset any incremental U.S. tax liabilities, and therefore, no additional net deferred taxes were recorded in the second quarter of 2015. As such, none of Marathon Oil’s foreign earnings remain permanently reinvested abroad.
In the second quarter of 2014, we reviewed our foreign operations, including the disposition of our Norway business, and concluded that our foreign operations did not have the same level of immediate capital needs as previously expected.  Therefore, we removed our assertion for previously unremitted foreign earnings associated with our U.K. operations to be permanently reinvested outside the U.S.  The U.K. statutory tax rate was in excess of the U.S. statutory tax rate and therefore foreign tax credits associated with these earnings exceeded any incremental U.S. tax liabilities. 
Adjustments to valuation allowances – In 2015,- Since December 31, 2016, we increased the valuation allowance against foreign tax credits because it is more likely than not that we will be unable to realize all U.S. benefits on foreign taxes accrued in 2015. Additionally, we increased thehave maintained a full valuation allowance on our net federal deferred tax assets associated with our foreign operationsassets. In 2017, we recorded a $446 million valuation allowance primarily related to current year activity in the U.S. Included within the $446 million is a $41 million out-of-period adjustment as a result of pretax lossesidentifying certain deferred tax assets for which the impact should have been recorded to other comprehensive income, but had been recorded to income from continuing operations in certain jurisdictions. In 2014, we increased the valuation allowance against foreign tax credits as a result of removing the permanent reinvestment assertion on our U.K. operations since the U.K. statutory tax rate is in excess of the U.S. statutory tax rate per discussion above.2016.
Change in tax law – On June 29, 2015,December 22, 2017, the Alberta governmentU.S. enacted legislationthe Tax Cuts and Jobs Act (the “Tax Reform Legislation”). Tax Reform Legislation, which is also commonly referred to increaseas “U.S. tax reform”, significantly changes U.S. corporate income tax laws by, among other things, reducing the provincialU.S. corporate income tax rate from 10% to 12%. As21% starting in 2018, and repeal of the corporate alternative minimum tax (“AMT”), and a resultone-time deemed repatriation of this legislation,accumulated foreign earnings. In the fourth quarter of 2017, we recorded additional non-cashremeasured our deferred taxes at 21%, in accordance with U.S. GAAP standards. 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. We recorded a net benefit of $35 million, classified as a receivable within other noncurrent assets on the consolidated balance sheet, during the fourth quarter of 2017 related to the repeal of the corporate AMT. Although the $35 million net benefit represents what we believe is a reasonable estimate of the impact of the income tax effects of the Act on our consolidated financial statements as of December 31, 2017, it should be considered provisional. We do
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


not expect to pay U.S. federal cash taxes on the deemed repatriation due to an accumulated deficit in foreign earnings for tax purposes.
Once we finalize certain tax positions when we file our 2017 federal tax return, we will be able to conclude whether any further adjustments are required to our net tax position as of December 31, 2017. Any adjustments to these provisional amounts will be reported as a component of income tax expense of $135 million(benefit) in the secondreporting period in which any such adjustments are determined, which will be no later than the fourth quarter of 2015.2018.
Deferred tax assets and liabilities resulted from the following:
Year Ended December 31,Year Ended December 31,
(In millions)2015 20142017 2016
Deferred tax assets:      
Employee benefits$260
 $364
$111
 $228
Operating loss carryforwards563
 245
1,030
 1,065
Capital loss carryforwards17
 89
3
 4
Foreign tax credits4,335
 4,062
611
 4,430
Other credit carryforwards35
 

 35
Investments in subsidiaries and affiliates17
 
174
 91
Other73
 116
69
 86
Valuation allowances:   
Federal(2,820) (2,775)
State, net of federal benefit(56) (58)
Foreign(162) (108)
Subtotal1,998
 5,939
Valuation Allowance(926) (4,301)
Total deferred tax assets2,262
 1,935
1,072
 1,638
Deferred tax liabilities:      
Property, plant and equipment3,376
 3,737
1,332
 3,672
Investments in subsidiaries and affiliates
 66
Accrued revenue81
 75
Other105
 67
3
 (7)
Total deferred tax liabilities3,481
 3,870
1,416
 3,740
Net deferred tax liabilities$1,219
 $1,935
$344
 $2,102

Foreign Tax Credits - As a result of U.S. tax reform, we have reduced our foreign tax credits at December 31, 2017, which are offset by a corresponding reduction in valuation allowance, by $3,819 million due to the remote likelihood these credits will be utilized before expiration. We have not elected any of our foreign earnings to be permanently reinvested abroad. Additionally due to U.S. tax reform, we do not expect future foreign earnings from operations to be subject to tax in the U.S. The remaining foreign tax credits, which are offset by a valuation allowance, expire in 2022 through 2027.
Operating loss carryforwards - At December 31, 20152017, our operating loss carryforwards before valuation allowance includes $365$898 million from the U.S. that expire in 2035.2035-2037. Foreign operating loss carryforwards include $863$13 million from Canada that begin to expire in 2029 through 2035, $208

82

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


million from the Kurdistan Region of Iraq that expire in 2016 through 2020, $84 million from Libya that expires in 2025 and $81 million from E.G. that expire in 2017 through 2020.2018. State operating loss carryforwards of $1,415$119 million expire in 20162018 through 2035. Foreign tax credit carryforwards of $3,798 million expire in 2022 through 2025.2037.
Valuation allowancesWe consider whether it is more likely than not that some portion or allAt December 31, 2017, we reflect a valuation allowance in our consolidated balance sheet of $926 million against our net deferred tax assets will not be realized. In the event it is more likely than not that some portion or all of our deferred taxes will not be realized, such assets are reduced by a valuation allowance.in various jurisdictions in which we operate. The estimated realizability of the benefit of our deferred tax asset is based on certain estimates concerning future operating conditions (particularly asreduction primarily related to prevailing commodity prices), future financial conditions, income generated fromthe reduction of foreign sources and our tax profilecredits in the years that such operating loss carryforwardsU.S. In 2016 and tax credits may be claimed. Future increases to2015, we increased our valuation allowance are possible if our estimatesby $1,268 million and assumptions (particularly as they relate to downward revisions of our long-term commodity price forecasts) are revised such that they reduce estimates of future taxable income during the carryforward period.
Federal valuation allowances increased $45$99 million in 2015 related to U.S. benefits on foreign taxes accrued in 2015. Federal valuation allowances decreased $222 million in 2014 primarily due to the sale of our Norway and Angola businesses. Federal valuation allowances increased $930 million in 2013 related to U.S. benefits on foreign taxes accrued in that year.
Foreign valuation allowances increased $54 million in 2015 primarily due to deferred tax assets generated in the Kurdistan Region of Iraq, E.G. and Gabon. Foreign valuation allowances decreased $41 million in 2014 primarily due the disposal of our Angolan assets. Foreign valuation allowances decreased $61 million in 2013 primarily due to the disposal of our Indonesian assets.respectively.
Net deferred tax liabilities were classified in the consolidated balance sheets as follows:
 December 31,
(In millions)2015
2014
Assets:


Other current assets$

$29
Other noncurrent assets1,222

525
Liabilities:


Other current liabilities

3
Noncurrent deferred tax liabilities2,441

2,486
Net deferred tax liabilities$1,219

$1,935
We elected to prospectively adopt Accounting Standards Update 2015-17, Balance Sheet Classification of Deferred Taxes, as of December 31, 2015, as disclosed in Note 2. Under this new guidance, we classify all deferred tax assets and liabilities and related valuation allowances as noncurrent. In accordance with a prospective adoption, we did not restate the balance sheet classification of deferred taxes for prior periods.
 December 31,
(In millions)2017 2016
Assets:
 
Other noncurrent assets$489
 $336
Liabilities:
 
Noncurrent deferred tax liabilities833
 769
Noncurrent liabilities held for sale
 1,669
Net deferred tax liabilities$344
 $2,102
We are continuously undergoing examination of our U.S. federal income tax returns by the IRS. Such audits have been completed through the 20092014 tax year. In November 2015,year, with the exception of 2010-11. During the third quarter of 2017, we received Notices of Proposed Adjustmenta
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


partnership adjustment notification related to our 2010-2011the 2010 and 2011 tax years. We anticipate receivingyears, for which we have filed a Tax Court Petition in the final agent's report in 2016.fourth quarter of 2017. We believe adequate provision has been made for federal income taxes and interest which may become payable for years not yet settled. See Note 24 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.

As of December 31, 20152017, our income tax returns remain subject to examination in the following major tax jurisdictions for the tax years indicated:
United States(a)
2004-2014
Canada2010-20142008-2016
Equatorial Guinea2007-20142007-2016
Libya2012-20142012-2016
United Kingdom2008-20142008-2016
(a) 
Includes federal and state jurisdictions.

83

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


The following table summarizes the activity in unrecognized tax benefits:
(In millions)2015 2014 20132017 2016 2015
Beginning balance$80
 $146
 $98
$66
 $65
 $80
Additions for tax positions related to the current year
 
 14
Additions for tax positions of prior years1
 11
 66
83
 6
 1
Reductions for tax positions of prior years
 (68) (25)(3) (5) 
Settlements(7) (9) (5)(20) 
 (7)
Statute of limitations(9) 
 (2)
 
 (9)
Ending balance$65
 $80
 $146
$126
 $66
 $65
If the unrecognized tax benefits as of December 31, 20152017 were recognized, $25$10 million would affect our effective income tax rate. As of December 31, 2015,2017, there are no material$83 million uncertain tax positions for which it is reasonably possible that the amount wouldcould significantly increase or decreasechange during the next twelve months. If this were to significantly change, we estimate that any revisions to current and deferred tax liabilities would have no cumulative adverse earnings impact on our consolidated results of operations.
The U.K. tax authorities have challenged the timing of deductibility for certain Brae area decommissioning costs. In the fourth quarter of 2017, we received an adverse ruling from the U.K. first-tier tax tribunal. As a result of the adverse ruling, in the fourth quarter of 2017 we established an uncertain tax position. We have appealed the ruling, but were required to pay the disputed tax amount and associated interest in order to pursue the appeal. The payment of the disputed tax and interest, approximately $108 million, is not considered a settlement of the tax dispute with the U.K. tax authorities. If we prevail in appeals, we will be refunded the tax and interest paid, however, if we do not prevail no further material cash payments are expected due to the initial payment required to appeal the adverse ruling. See Note 24 for further detail.
Interest and penalties are recorded as part of the tax provision and were $2 million, $1 million $6 million and $13$1 million related to unrecognized tax benefits in 2015, 20142017, 2016 and 2013.2015. As of December 31, 20152017 and 2014, $142016, $25 million and $16$15 million of interest and penalties were accrued related to income taxes.
Pretax income (loss) from continuing operations included amounts attributable to foreign sources of $(654) million, $1,180 million and $2,336 million in 2015, 2014 and 2013.
10.8. Inventories
Liquid hydrocarbons,Crude oil and natural gas and bitumen are recorded at weighted average cost and carried at the lower of cost or marketnet 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.
December 31,December 31,
(In millions)2015 20142017 2016
Liquid hydrocarbons, natural gas and bitumen$35
 $58
Crude oil and natural gas$9
 $6
Supplies and other items278
 299
117
 130
Inventories at cost$313
 $357
Inventories$126
 $136

11. Equity Method Investments and Related Party Transactions
During 2015, 2014 and 2013 only our equity method investees were considered related parties and they 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:
 Ownership as of December 31,
(In millions)December 31, 2015 2015 2014
EGHoldings60% $603
 $693
Alba Plant LLC52% 230
 225
AMPCO45% 169
 194
Other investments  1
 1
Total  $1,003
 $1,113
Dividends and partnership distributions received from equity method investees (excluding distributions that represented a return of capital previously contributed) were $178 million in 2015, $451 million in 2014 and $435 million in 2013.

84

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


Summarized financial information for equity method investees is as follows:
(In millions)2015 2014 2013
Income data – year:     
Revenues and other income$769
 $1,349
 $1,444
Income from operations313
 826
 849
Net income280
 728
 727
Balance sheet data – December 31:     
Current assets$467
 $639
  
Noncurrent assets1,317
 1,451
  
Current liabilities211
 371
  
Noncurrent liabilities41
 39
  
Revenues from related parties were $51 million, $56 million and $55 million in 2015, 2014 and 2013, with the majority related to EGHoldings in all years. Purchases from related parties were $207 million, $207 million and $242 million in 2015, 2014 and 2013 with the majority related to Alba Plant LLC in all years.
Current receivables from related parties at December 31, 2015 and 2014, were $29 million, and $31 million. Payables to related parties were $5 million and $11 million at December 31, 2015 and 2014, with the majority related to Alba Plant LLC.
12.9. Property, Plant and Equipment
December 31,December 31,
(In millions)2015 20142017 2016
North America E&P$15,226
 $16,717
United States E&P$15,867
 $14,158
International E&P2,533
 2,741
1,710
 2,470
Oil Sands Mining9,197
 9,455
Corporate105
 127
88
 99
Net property, plant and equipment$27,061
 $29,040
$17,665
 $16,727
Our Libya operations continue to be impacted by civil unrest. Operations were interrupted in mid-2013 as a result of the shutdown of the Es Sider crude oil terminal, and although temporarily re-opened during the second half of 2014, production remains shut-in through early 2016. Considerable uncertainty remains around the timing of future production and sales levels.
As ofAt December 31, 2017, 2016 and 2015 our net property, plant and equipment investment in Libya is approximately $777 million, andwe had total proved reserves (unaudited) in Libya are 235 mmboe. We and our partners in the Waha concessions continue to assess the situation and the condition of our assets in Libya. Our periodic assessment of the carrying value of our net property, plant and equipment in Libya specifically considers the net investment in the assets, the duration of our concessions and the reserves anticipated to be recoverable in future periods.  The undiscounted cash flows related to our Libya assets continue to exceed the carrying value of $777 million by a significant amount.

85

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


Deferreddeferred exploratory well costs were as follows:
December 31,December 31,
(In millions)2015 2014 20132017 2016 2015
Amounts capitalized less than one year after completion of drilling$352
 $484
 $512
$263
 $131
 $352
Amounts capitalized greater than one year after completion of drilling85
 126
 281
32
 118
 85
Total deferred exploratory well costs$437
 $610
 $793
$295
 $249
 $437
Number of projects with costs capitalized greater than one year after          
completion of drilling2
 3
 7
1
 3
 2
  
     
(In millions)2015 2014 20132017 2016 2015
Beginning balance$610
 $793
 $617
$249
 $437
 $573
Additions610
 647
 624
212
 299
 610
Charges to expense(148) (45) (25)
Charges to expense (a)
(64) (23) (111)
Transfers to development(635) (579) (414)(102) (388) (635)
Dispositions(a)

 (206) (9)
Dispositions(b)

 (76) 
Ending balance$437
 $610
 $793
$295
 $249
 $437
(a) 
Includes $64 million in exploratory well costs being expensed as a result of our agreement to sell Diaba License G4-223 in the Republic of Gabon in August of 2017. See Note 10 for further detail.
(b)
Includes sale of AngolaGOM assets and Norway business in 2014.2016.

Exploratory well costs capitalized greater than one year after completion of drilling are associated with one project in E.G. with costs of $32 million as of December 31, 2015 are summarized by geographical area below:
(In millions)
  
Gabon$63
E.G.22
Total$85
Well costs that have been suspended for longer than one year are associated with two projects.2017. Management believes these projectsthis project with suspended exploratory drilling costs exhibit sufficient quantities of hydrocarbons to justify potential development based on current plans.
Gabon - The Diaba-1B For this project in E.G., drilling was completed on the Rodo well reached total depthin Alba Block Sub Area B, offshore E. G. in the thirdfirst quarter of 2013. Additional 3D seismic data was acquired in 2014 in the western part of the block and depth processing continued through 2015.  We continue to utilize this data to facilitate evaluation of additional resource potential on the offshore Diaba License to support decisions regarding the exploration program, with drilling currently planned for 2017.
E.G. – The Corona well on Block D offshore E.G. was drilled in 2004,2015, and we acquired an additional interest in the well in 2012. We planhave since completed a seismic feasibility study. In 2017, we received approval for and proceeded to develop Block D throughperform a unitization with the Alba field. Negotiations have been substantially completed and approval is expected in 2016.seismic reprocessing program. After completion of this program we will evaluate drilling opportunities within Sub Area B.
13.10. Impairments and Exploration Expenses
During 2015, the continued decline of commodity prices resulted in downward revisionsImpairments
As a result of our long-term commodity price assumptions and resultedannounced disposition of our Canadian business in impairmentsthe first quarter of long-lived assets2017, we recorded a pre-tax non-cash impairment charge of $6.6 billion primarily related to oilproperty, plant and gas producing properties. Further changesequipment. This impairment in management's forecast assumptions (including our Capital Program), or continued deterioration in commodity prices may cause us to reassess our long-lived assets and goodwill for impairment, and could result in impairment chargesCanadian business is reflected as discontinued operations in the future.
Impairmentsconsolidated statements of income and the consolidated statements of cash flows for all periods presented
The following table summarizes impairment charges of proved properties:
Year Ended December 31,Year Ended December 31,
(in millions)2015 2014 20132017 2016 2015
Total impairments$752
 $132
 $96
$229
 $67
 $721
2017 - Impairments were primarily a result of lower forecasted long-term commodity prices and the anticipated sales of certain non-core proved properties in our International E&P segment of $136 million. Additionally, included in proved property impairments was $89 million relating to the Gulf of Mexico and certain conventional Oklahoma assets primarily as a result of lower forecasted long-term commodity prices.
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


2016 - Impairments of $67 million consisted primarily of proved properties in Oklahoma and the Gulf of Mexico as a result of lower forecasted commodity prices and revisions to estimated abandonment costs.
2015 - Impairments included $340 million million for the goodwill impairment of the North AmericaUnited States E&P reporting unit, and $335 million related to proved properties (primarily in Colorado and the Gulf of Mexico) as a result of lower forecasted

86

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


commodity prices, and $44 million associated with our disposition of natural gas assets in East Texas, North Louisiana and Wilburton, Oklahoma.
2014 - Impairments of $132 million consisted primarily of proved properties in the Gulf of Mexico, Texas and North Dakota as a result of revisions to estimated abandonment costs and lower forecasted commodity prices.
2013 - Impairments of $96 million included an impairment to the second LNG production train in E.G. as a result of a change in E.G.'s natural gas policy related to the country's resources for $40 million, a $15 million impairment of our Powder River Basin assets as a result of our decision to wind down operations and other impairments of long-lived assets as a result of reduced drilling expectations, reductions of estimated reserves or decreased commodity prices.
See Note 76 for relevant detail regarding segment presentation, Note 1412 for further detail regarding the goodwill impairment and Note 1514 for fair value measurements related to impairments of proved properties and long-lived assets.
Exploration expense
The following table summarizes the components of exploration expenses:
Year Ended December 31,Year Ended December 31,
(In millions)2015 2014 20132017 2016 2015
Exploration Expenses          
Unproved property impairments$964
 $306
 $572
$246
 $195
 $655
Dry well costs250
 317
 148
77
 25
 212
Geological and geophysical31
 85
 80
25
 5
 31
Other73
 85
 91
61
 98
 73
Total exploration expenses$1,318
 $793
 $891
$409
 $323
 $971
Unproved property impairments and dry well costs
2017 - As a result of lower forecasted long-term commodity prices and the anticipated sales of certain non-core properties in our International E&P segment, we recorded a non-cash charge of $159 million comprised of $95 million in unproved property impairments; and $64 million in dry well costs related to our Diaba License G4-223 in the Republic of Gabon. Also, because of our decision not to develop the Tchicuate offshore Block in the Republic of Gabon, we recorded a non-cash impairment charge of $43 million to unproved property.
2016 - Unproved property impairments recorded of $195 million were primarily a result of our decision to not drill any of our remaining Gulf of Mexico undeveloped leases and also includes certain other unproved properties in the United States. Lower dry well expense was a result of the strategic decision to transition out of our conventional exploration program during 2015.
2015- Primarily due to changes in our conventional exploration strategy (Gulf of Mexico, Canadian in-situ assets and Harir block in the Kurdistan Region of Iraq), relinquishment of certain properties in the Gulf of Mexico, the operated Solomon exploration well in the Gulf of Mexico and our unproved property in Colorado as a result of the proved property impairment mentioned above. Dry well costs include the operated Solomon exploration well in the Gulf of Mexico, and our operated Sodalita West #1 exploratory well in E.G.
2014 - Primarily consists of Eagle Ford and Bakken leases that either expired or we decided not to drill or extend.
2013 - Primarily consists of Eagle Ford leases that either expired or we decided not to drill or extend.
See Note 76 for relevant detail regarding segment presentation of unproved property impairments.
Dry
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


11. 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 were as follows:
 For Year Ended December 31,
(In millions)2017 2016
Beginning balance$1,652
 $1,544
Incurred liabilities, including acquisitions25
 14
Settled liabilities, including dispositions(50) (74)
Accretion expense (included in depreciation, depletion and amortization)85
 79
Revisions of estimates(227) 96
Held for sale(2) (7)
Ending balance$1,483
 $1,652
2017
Settled liabilities include dispositions, primarily related to the sale of certain conventional assets in Oklahoma as well costs    as retirements in the U.K. and the Gulf of Mexico.
2015Revisions of estimates - Includeswere primarily due to changes in U.K. estimated costs as well as timing of abandonment activities in the operated Solomon explorationU.K.
Ending balance includes $55 million classified as short-term at December 31, 2017.
2016
Settled liabilities include dispositions, primarily related to the Gulf of Mexico and Wyoming as well as retirements in the Gulf of Mexico, our operated Sodalita West #1 exploratoryMexico.
Revisions of estimates were primarily due to changes in timing of abandonment activities as well as changes in E.G. and suspended well costs related our Canadian in-situ assets at Birchwood.
2014 - Includes the operated Key Largo well, outside-operated Perseus well and the outside operated second Shenandoah appraisal well, all of which are locatedcost estimated in the Gulf of Mexico. In addition, 2014 alsoU.K.
Ending balance includes our exploration programs in Kurdistan Region of Iraq, Ethiopia and Kenya.$50 million classified as short-term at December 31, 2016.
2013 - Primarily includes our exploration programs in Norway, Kurdistan Region of Iraq, Ethiopia, Kenya, Poland and Gulf of Mexico.

14.12. Goodwill
Goodwill is tested for impairment on an annual basis, as of April 1 each year, or between annual tests when events or changes in circumstances indicate the fair value of a reporting unit with goodwill 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 North America E&P and International E&P includeincludes goodwill. We estimatedestimate the fair valuesvalue of the North America E&P andour International E&P reporting unitsunit using a combination of market and income approaches. Determining the fair value of a reporting unit requires judgment and the use of significant estimates and assumptions. The market approach referenced 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 utilized discounted cash flows, which were based on forecasted

87

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


assumptions. Key assumptions to the income approach include:include future liquid hydrocarbon and natural gas prices,pricing, estimated quantities of liquid hydrocarbonhydrocarbons and natural gas proved and probable reserves, expectedestimated timing of production, discount rates, future capital requirements, and operating expenses and tax rates. The assumptions used in the income approach are consistent with those that management uses to make business decisions. These valuation methodologies represent Level 3 fair value measurements. We performed our annual impairment test in the second quarter of 2017 and concluded no impairment was required. As of the date of our last impairment assessment, the fair value of our International E&P reporting unit exceeded its book value by over 40%. 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.
We performed our annual impairment tests as of April 1 in 2015, 2014 and 2013 and no impairment was required. The fair value of each of our reporting units with goodwill exceeded the book value. Subsequent
MARATHON OIL CORPORATION
Notes to our goodwill impairment test in April 2015, triggering events (downward revisions to forecasted commodity price assumptions and sustained price declines in our common stock) required us to reassess our goodwill for impairment as of September 30, 2015 and December 31, 2015. We recorded an impairment of goodwill for the N.A. E&P reporting unit during the fourth quarter of 2015. While the fair value of our International E&P reporting unit exceeded book value, subsequent commodity price and/or common stock price declines may cause us to reassess our goodwill for impairment and could result in a non-cash impairment charge in the future.Consolidated Financial Statements


The table below displays the allocated beginning goodwill balances by segment along with changes in the carrying amount of goodwill for 20152017 and 2014:2016:
(In millions)N.A. E&P Int'l E&P OSM TotalU.S. E&P Int'l E&P Total
2014       
Beginning balance, gross$347
 $152
 $1,412
 $1,911
Less: accumulated impairments
 
 (1,412) (1,412)
Beginning balance, net347
 152
 
 499
Dispositions(3) (37) 
 (40)
Ending balance, net$344
 $115
 $
 $459
2015       
2016     
Beginning balance, gross$344
 $115
 $1,412
 $1,871
$
 $115
 $115
Less: accumulated impairments
 
 (1,412) (1,412)
 
 
Beginning balance, net344
 115
 
 459

 115
 115
Dispositions(4) 
 
 (4)
 
 
Impairment(340) 
 
 (340)
 
 
Ending balance, net$
 $115
 $
 $115
$
 $115
 $115
2017     
Beginning balance, gross$
 $115
 $115
Less: accumulated impairments
 
 
Beginning balance, net
 115
 115
Dispositions
 
 
Impairment
 
 
Ending balance, net$
 $115
 $115


13. Derivatives
For further information regarding the fair value measurement of derivative instruments see Note 14. See Note 1 for discussion of the types of derivatives we use and the reasons for them. All of our commodity derivatives and historical interest rate derivatives are subject to enforceable master netting arrangements or similar agreements under which we may 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.
88

 December 31, 2017  
(In millions)Asset Liability Net Asset Balance Sheet Location
Not Designated as Hedges       
     Commodity$
 $138
 $(138) Other current liabilities
     Commodity
 2
 (2) Deferred credits and other liabilities
Total Not Designated as Hedges$
 $140
 $(140)  
     Total$
 $140
 $(140)  
 December 31, 2016  
(In millions)Asset Liability Net Asset Balance Sheet Location
Fair Value Hedges       
     Interest rate$3
 $
 $3
 Other current assets
     Interest rate1
 
 1
 Other noncurrent assets
Cash Flow Hedges       
     Interest rate$64
 $
 $64
 Other noncurrent assets
Total Designated Hedges$68
 $
 $68
  
        
Not Designated as Hedges       
     Commodity$
 $60
 $(60) Other current liabilities
Total Not Designated as Hedges$
 $60
 $(60)  
     Total$68
 $60
 $8
  

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


15.Derivatives Designated as Fair Value Hedges
During the third quarter of 2017, we terminated all of our interest rate swaps designated as fair value hedges. The pretax effects of derivative instruments designated as hedges of fair value in our consolidated statements of income has a gross impact that is not material to net interest and other in all periods presented. Additionally, there is no ineffectiveness related to fair value hedges in all periods presented.
The following table presents, by maturity date, information about our interest rate swap agreements, including the weighted average, London Interbank Offer Rate (“LIBOR”) based, floating rate.
 December 31, 2017 December 31, 2016
 Aggregate Notional AmountWeighted Average, LIBOR-Based, Aggregate Notional AmountWeighted Average, LIBOR-Based,
Maturity Dates(in millions)Floating Rate (in millions)Floating Rate
October 1, 2017$
% $600
5.10%
March 15, 2018$
% $300
5.04%
The pretax effect of derivative instruments designated as hedges of fair value in our consolidated statements of income is summarized in the table below. There is no ineffectiveness related to the historical fair value hedges.
  Gain (Loss)
  Year Ended December 31,
(In millions)Income Statement Location2017 2016 2015
Derivative      
Interest rateNet interest and other$
 $(4) $
Hedged Item  
  
  
DebtNet interest and other$
 $4
 $

Derivatives Not Designated as Hedges
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. We designated these derivative instruments as cash flow hedges. 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. See Note 15 for further detail. As a result, we terminated our forward starting interest rate swaps receiving proceeds of $54 million. We recognized a gain of $47 million, related to deferred gains reclassified from accumulated other comprehensive income, in net interest and other during 2017.
The following table presents, by maturity date, information about our terminated forward starting interest rate swap agreements, including the rate.
 December 31, 2017 December 31, 2016
 Aggregate Notional AmountWeighted Average, LIBOR Aggregate Notional AmountWeighted Average, LIBOR
Maturity Dates(in millions)Fixed Rate (in millions)Fixed Rate
March 15, 2018$
% $750
1.57%
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


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,
(In millions) 2017 2016 2015
Interest Rate Swaps      
  Beginning balance $60
 $
 $
Change in fair value recognized in other comprehensive income (13) 64
 
Reclassification from other comprehensive income (47) (4) 
  Ending balance $
 $60
 $
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 E&P sales through 2019. These commodity derivatives consist of three-way collars, swaps, and 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, 2017 and the weighted average prices for those contracts:
Crude Oil
 2018 2019
 First Quarter Second Quarter Third Quarter Fourth Quarter First Quarter Second Quarter
Three-Way Collars (a)
           
Volume (Bbls/day)85,000 85,000 85,000 85,000 10,000 10,000
Weighted average price per Bbl:           
Ceiling$56.38 $56.38 $56.96 $56.96 $60.00 $60.00
Floor$51.65 $51.65 $51.53 $51.53 $55.00 $55.00
Sold put$45.00 $45.00 $44.65 $44.65 $47.00 $47.00
Swaps           
Volume (Bbls/day)20,000 20,000    
Weighted average price per Bbl$55.12 $55.12 $— $— $— $—
Basis Swaps (b)
           
Volume (Bbls/day)5,000 5,000 10,000 10,000  
Weighted average price per Bbl$(0.60) $(0.60) $(0.67) $(0.67) $— $—
(a)
Between January 1, 2018 and February 12, 2018, we entered into 10,000 Bbls/day of three-way collars for July - December 2018 with an average ceiling price of $63.51, a floor price of $57.00, and a sold put price of $50.00 and 20,000 Bbls/day of three-way collars for January - June 2019 with an average ceiling price of $67.92, a floor price of $53.50, and a sold put price of $46.50.
(b)
The basis differential price is between WTI Midland and WTI Cushing.
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


Natural Gas
 2018
 First QuarterSecond QuarterThird QuarterFourth Quarter
Three-Way Collars    
Volume (MMBtu/day)200,000160,000160,000160,000
Weighted average price per MMBtu    
Ceiling$3.79$3.61$3.61$3.61
Floor$3.08$3.00$3.00$3.00
Sold put$2.55$2.50$2.50$2.50

The mark-to-market impact and settlement of these commodity derivative instruments appears in sales and other operating revenues in our consolidated statements of income for the years ended December 31, 2017, 2016, and 2015. The December 31, 2017, 2016, and 2015 impact was a net loss of $36 million, a net loss of $66 million, and a net gain of $128 million, respectively. Net settlements of commodity derivative instruments for the years ended December 31, 2017, 2016, and 2015 were gains of $45 million, $44 million, and $78 million, respectively.
14. Fair Value Measurements
Fair values – Recurring
The following tablestables' present assets and liabilities accounted for at fair value on a recurring basis by hierarchy level.
December 31, 2015December 31, 2017
(In millions)Level 1 Level 2 Level 3 TotalLevel 1 Level 2 Level 3 Total
Derivative instruments, assets              
Commodity$
 $51
 $
 $51
Interest rate
 8
 
 8

 
 
 
Derivative instruments, assets$
 $59
 $
 $59
$
 $
 $
 $
Derivative instruments, liabilities              
Commodity$
 $1
 $
 $1
Commodity (a)
$(20) $(120) $
 $(140)
Derivative instruments, liabilities$
 $1
 $
 $1
$(20) $(120) $
 $(140)
              
December 31, 2014December 31, 2016
(In millions)Level 1 Level 2 Level 3 TotalLevel 1 Level 2 Level 3 Total
Derivative instruments, assets              
Interest rate$
 $8
 $
 $8
$
 $68
 $
 $68
Derivative instruments, assets$
 $8
 $
 $8
$
 $68
 $
 $68
Derivative instruments, liabilities       
Commodity (a)
$
 $60
 $
 $60
Derivative instruments, liabilities$
 $60
 $
 $60
(a) Derivative instruments are recorded on a net basis in our balance sheet (see Note 13).
Commodity derivatives include three-way collars, extendable three-way collarsswaps, and call options.basis swaps. These instruments are measured at fair value using either thea Black-Scholes Model or the Blacka modified Black-Scholes Model. InputsFor swaps and basis swaps, inputs to boththe models include 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, interest rates, and implied volatility. The inputs to these modelsvolatility and are categorized as Level 2 because predominantly all assumptions and inputs are observable in active markets throughout the term of the instruments.
InterestHistorically, both our interest rate swaps and forward starting interest rate swaps are measured at fair value with a market approach using actionable broker quotes, which are Level 2 inputs. See Note 1613 for additional discussion of the types of derivative instruments we use.  
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


Fair values – Nonrecurring
The following table shows the values of assets, by major category, measured at fair value on a nonrecurring basis in periods subsequent to their initial recognition.
2015 2014 20132017 2016 2015
(In millions)Fair Value Impairment Fair Value Impairment Fair Value ImpairmentFair Value Impairment Fair Value Impairment Fair Value Impairment
Long-lived assets held for use$56
 $412
 $43
 $132
 $5
 $96
$179
 $229
 $15
 $67
 $56
 $386
Long-lived assets held for use that were impaired are discussed below. The fair values, of eachunless otherwise noted, were measured using an income approach based upon internal estimates of future production levels, prices and discount rate, all of which are Level 3 inputs, unless otherwise noted.inputs.  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.
North AmericaUnited States E&P
In the third quarter of 2017, impairments of $65 million were recorded consisting of certain proved properties in the Gulf of Mexico as a result of lower forecasted long-term commodity prices, to an aggregate fair value of $66 million.
In the third quarter of 2016, impairments of $47 million were recorded consisting primarily of conventional non-core proved properties in Oklahoma as a result of lower forecasted long-term commodity prices, to an aggregate fair value of $15 million. During the fourth quarter of 2016, we recorded an impairment of $17 million as a result of abandonment cost revisions related to the Ozona development in the Gulf of Mexico which ceased productions in 2013.
In the third quarter of 2015, impairments of $333 million were recorded primarily related to certain producing assets in Colorado and the Gulf of Mexico as a result of lower forecasted commodity prices, to an aggregate fair value of $41 million.
During the second quarter of 2015, we recorded an impairment charge of $44 million related to East Texas, North Louisiana and Wilburton, Oklahoma natural gas assets as a result of the anticipated sale (See Note 5).sale. The fair values were measured using a probability weighted income approach based on both the anticipated sale price and held-for-use model.
International E&P
In the third quarter of 2014,2017, we recorded proved property impairments of $53 million were recorded to Gulf of Mexico properties as a result of estimated abandonment cost and other revisions, to an aggregate fair value of $19 million. In addition, two fields were impaired a total of $47$136 million, to an aggregate fair value of $24$103 million, primarily due to lower forecasted commodity prices.
The Ozona developmenton certain non-core properties in the Gulf of Mexico ceased production in 2013 and a $21 million impairment was recorded to write down the assets' remaining value. During 2014, we recorded additional impairments of $30 millionour International E&P segment primarily as a result of abandonment cost revisions.

89

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


Other impairments of long-lived assets held for use in 2015, 2014lower forecasted long-term commodity prices and 2013 wereas a result of reduced drilling expectations, reductionsthe anticipated sales of estimated reservescertain non-core international assets. The fair values were measured using the market approach, based upon either anticipated sales proceeds less costs to sell or decreased commodity prices.
a market comparable sales price per boe. This resulted in a Level 2 classification. See Note5 for further information about the divestment of certain non-core properties in our International E&P segment.
In the third quarter of 2015, a partial impairment of $12 million was recorded to an investment in an equity method investee as a result of lower forecasted commodity prices, to a fair value of $604 million. The impairment was reflected in income from equity method investments in our consolidated statement of income.
In the fourth quarter of 2013, asCanadian discontinued operations
As a result of E.G.’s natural gas policyour announced disposition of our Canadian business in the first quarter of 2017, we recorded a pre-tax non-cash impairment charge of $6.6 billion primarily related to property, plant and equipment. 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 country’s resources, we electedanticipated sales proceeds less costs to cease our efforts to developsell, which resulted in a second LNG production train on Bioko Island and recorded a $40 million impairment of all capitalized costs associated with engineering and feasibility studies. In addition, our share of income from EGHoldings included a $4 million impairment related to the same project, reflected in income from equity method investments in the 2013 consolidated statement of income.
Oil Sands Mining
In the fourth quarter of 2015, impairments of $26 million were recorded related to long-lived assets used in outside operated debottlenecking projects. Based on an evaluation by the operator, it was determined that the projects would not continue due to a need to reduce capital intensity and improve efficiency.Level 2 classification. See Note 5 for relevant detail regarding dispositions
Fair values – Financial instruments
Our current assets and liabilities include financial instruments, the most significant of which are receivables, commercial paperlong-term debt and payables. We believe the carrying values of our receivables commercial paper 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 investment-grade credit rating and (3) our historical incurrence of and expected future insignificance of bad debt expense, which includes an evaluation of counterparty credit risk.
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


The following table summarizes financial instruments, excluding receivables, commercial paper, payables and derivative financial instruments, and their reported fair value by individual balance sheet line item at December 31, 20152017 and 2014.2016.
December 31,December 31,
2015 20142017 2016
(In millions)
Fair
Value
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
Fair
Value
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
Financial assets              
Other current assets (a)
$762
 $761
 $7
 $7
Other noncurrent assets$104
 $118
 $132
 $129
159
 161
 105
 108
Total financial assets$104
 $118
 $132
 $129
$921
 $922
 $112
 $115
Financial liabilities              
Other current liabilities$34
 $33
 $13
 $13
$32
 $43
 $68
 $75
Long-term debt, including current portion(a)
6,723
 7,291
 6,887
 6,360
Long-term debt, including current portion (b)
5,976
 5,526
 7,449
 7,292
Deferred credits and other liabilities97
 95
 69
 68
110
 103
 114
 107
Total financial liabilities$6,854
 $7,419
 $6,969
 $6,441
$6,118
 $5,672
 $7,631
 $7,474
(a) 
Includes our two notes receivable relating to the sale of our Canadian business as of December 31, 2017, see note 5 for further information.
(b)
Excludes capital leases.leases, debt issuance costs and historical interest rate swap adjustments.
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.
Most 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 such debt. The fair value of our debt that is not publicly-traded is measured using an income approach. The future debt service payments are discounted using the rate at which we currently expect to borrow. All inputs to this calculation are Level 3.

90

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


16. Derivatives
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 use and the reasons for them. All of our interest rate and commodity derivatives are subject to enforceable master netting arrangements or similar agreements under which we may 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.
 December 31, 2015  
(In millions)Asset Liability Net Asset Balance Sheet Location
Fair Value Hedges    

  
     Interest rate$8
 $
 $8
 Other noncurrent assets
Total Designated Hedges$8
 $
 $8
  
        
Not Designated as Hedges       
     Commodity$51
 $1
 $50
 Other current assets
Total Not Designated as Hedges$51
 $1
 $50
  
Total$59

$1

$58
  
 December 31, 2014  
(In millions)Asset Liability Net Asset Balance Sheet Location
Fair Value Hedges       
     Interest rate$8
 $
 $8
 Other noncurrent assets
Total Designated Hedges$8
 $
 $8
  

Derivatives Designated as Fair Value Hedges
The following table presents by maturity date, information about our interest rate swap agreements, including the weighted average, London Interbank Offer Rate (“LIBOR”)-based, floating rate.
 December 31, 2015 December 31, 2014
 Aggregate Notional AmountWeighted Average, LIBOR-Based, Aggregate Notional AmountWeighted Average, LIBOR-Based,
Maturity Dates(in millions)Floating Rate (in millions)Floating Rate
October 1, 2017$600
4.73% $600
4.64%
March 15, 2018$300
4.66% $300
4.49%
The pretax effect of derivative instruments designated as hedges of fair value in our consolidated statements of income is summarized in the table below. There is no ineffectiveness related to the fair value hedges.
  Gain (Loss)
  Year Ended December 31,
(In millions)Income Statement Location2015 2014 2013
Derivative      
Interest rateNet interest and other$
 $
 $(13)
Foreign currencyDiscontinued operations
 (36) (44)
Hedged Item  
  
  
Long-term debtNet interest and other$
 $
 $13
Accrued taxesDiscontinued operations
 36
 44
The table above reflects foreign currency forwards that hedged the current Norwegian tax liability of our Norway business, which was reported as discontinued operations. The open positions were transferred to the purchaser of our Norway business upon closing of the sale in the fourth quarter of 2014.

91

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


Derivatives Not Designated as Hedges
During 2015, we entered into multiple crude oil derivatives indexed to NYMEX WTI related to a portion of our forecasted North America E&P sales through December 2016. These commodity derivatives consist of three-way collars, extendable three-way collars and call options. 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 crude oil 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 price plus the difference between the floor and the sold put price. These commodity derivatives are shown in the table below:
Financial InstrumentWeighted Average PriceBarrels per dayRemaining Term
Three-Way Collars   
Ceiling$60.0310,000
January - March 2016 (a)
Floor$50.20  
Sold put$41.60  
    
Ceiling$71.8412,000January- December 2016
Floor$60.48  
Sold put$50.00  
    
Ceiling$73.132,000
January- June 2016 (b)
Floor$65.00  
Sold put$50.00  
Sold Call Options 
$72.3910,000
January- December 2016 (c)
(a)
Counterparties have the option, exercisable on March 31, 2016, to extend these collars through September of 2016 at the same volume and weighted average price as the underlying three-way collars.
(b)
Counterparty has the option, exercisable on June 30, 2016, to extend these collars through the remainder of 2016 at the same volume and weighted average price as the underlying three-way collars.
(c)
Call options settle monthly.
The impact of these crude oil derivative instruments appears in sales and other operating revenues in our consolidated statements of income and was a net gain of $128 million year to date December 31, 2015. There were no crude oil derivative instruments during 2014.
On June 1, 2015, we entered into Treasury rate locks, which expired on the same day, to hedge against timing differences as it related to our Notes offering (see Note 17). Following the execution of the Treasury locks, corresponding interest rates increased during the day of June 1. As a result, the settlement of the Treasury rate locks resulted in a gain of $6 million, which was recognized in net interest and other in our consolidated statements of income.

17. Debt
Short-term debt
As of December 31, 2015,2017, we had no borrowings against our $3.4 billion unsecured revolving credit facility (as amended, the "Credit Facility"), as described below, or under our U.S. commercial paper program that is backed by the Credit Facility.below.
Revolving Credit Facility
In May 2015,June 2017, we amendedextended the maturity date of our $2.5 billion Credit Facility from May 28, 2020 to increaseMay 28, 2021. In July 2017, we increased our $3.3 billion unsecured Credit Facility by $500$93 million to a total of $3 billion and extended$3.4 billion. Fees on the maturity date by an additional year such thatunused commitment of each lender, as well as the borrowing options under the Credit Facility, now matures in May 2020.  The amendment additionally provides usremain unaffected by the increase and term extension. We have the ability to request two additional one-year extensions to the maturity date and an option to increase the commitment amount by up to an additional $500$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. Fees on the unused commitment of each lender, as well as the borrowing options under the Credit Facility, remain unchanged.

92

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


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, 2015,2017, we were in compliance with this covenant with a debt-to-capitalization ratio of 28%32%.
Long-term debt
The following table details our long-term debt:
December 31,December 31,
(In millions)2015 20142017 2016
Senior unsecured notes:      
0.900% notes due 2015$
 $1,000
6.000% notes due 2017(a)
682
 682
5.900% notes due 2018(a)
854
 854
7.500% notes due 2019(a)
228
 228
6.000% notes due 2017
 682
5.900% notes due 2018
 854
7.500% notes due 2019
 228
2.700% notes due 2020(a)
600
 
600
 600
2.800% notes due 2022(a)
1,000
 1,000
1,000
 1,000
9.375% notes due 2022 (b)
32
 32
32
 32
Series A notes due 2022 (b)
3
 3
3
 3
8.500% notes due 2023 (b)
70
 70
70
 70
8.125% notes due 2023 (b)
131
 131
131
 131
3.850% notes due 2025(a)
900
 
900
 900
4.400% notes due 2027(a)
1,000
 
6.800% notes due 2032(a)
550
 550
550
 550
6.600% notes due 2037(a)
750
 750
750
 750
5.200% notes due 2045(a)
500
 
500
 500
Capital leases:      
Capital lease obligation of consolidated subsidiary due 2016 – 20499
 9
Capital lease obligation expiring in 2018
 1
Other obligations:      
4.550% promissory note, semi-annual payments due 2015
 68
5.125% obligation relating to revenue bonds due 20371,000
 1,000

 1,000
Total(b)
7,309
 6,377
5,536
 7,301
Unamortized discount(10) (8)(10) (9)
Fair value adjustments(c)
17
 22

 7
Unamortized debt issuance cost (d)
(39) (28)
Unamortized debt issuance cost(32) (35)
Amounts due within one year(1) (1,068)
 (683)
Total long-term debt$7,276
 $5,295
$5,494
 $6,581
(a) 
These notes contain a make-whole provision allowing us to repay the debt at a premium to market price.
(b) 
In the event of a change in control, as defined in the related agreements, debt obligations totaling $236 million at December 31, 20152017 may be declared immediately due and payable.
(c) 
See Notes 1513 and 1614 for information on historical interest rate swaps.
(d)
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


After the adoption of the debt issuance costs standard, these costs are now reflected as a direct reduction from the associated debt liability in our consolidated balance sheets. See Note 2 for information.
Debt Issuance
On June 10, 2015,July 24, 2017, we issued $2$1 billion aggregate principal amount of 4.4% senior unsecured senior notes which consist of the following series:
$600 million of 2.70% senior notes due June 1, 2020
$900 million of 3.85% senior notes due June 1, 2025
$500 million of 5.20% senior notes due June 1, 2045
that will mature on July 15, 2027. Interest on each series ofthe senior unsecured notes is payable semi-annually beginning December 1, 2015.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. The aggregateDuring the third quarter of 2017, we used the net proceeds were usedof $990 million plus existing cash on hand to repayredeem 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

During the year ended 2017, 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 $47 million into earnings in 2017. See Note 13 for further detail on our historical forward starting interest rate swaps.
Debt Redemption
In December 2017, we entered into a transaction to purchase $1 billion 0.90% senior notesof 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 $1 billion of 3.75% municipal revenue bonds due in 2037 on their date of issuance to hold for our own account and potential remarketing to the public at a future date.
The following table shows future debt payments:
(In millions) 
2018$
2019
2020600
2021
20221,035
Thereafter3,901
Total long-term debt, including current portion$5,536

16. 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 maturedare 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 November 2015,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, 2017, 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 remainderamount of the payment is based on (1) the vesting percentage, which can be from zero to 200% based on performance achieved and (2) the value of our common stock on the date vesting is determined by the Compensation Committee of the Board of Directors. The performance goals are tied to our total shareholder return (“TSR”) as compared to TSR for general corporate purposes. Asa group of December 31, 2015, we werepeer companies determined by the Compensation Committee of our Board of Directors. Dividend equivalents may accrue during the performance period and would be paid in compliance withcash at the covenants underend of the indenture governingperformance period based on the senior notes.number of shares that would represent the value of the units.

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


93

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


The following table shows future long-term debt payments:
(In millions) 
2016$1
2017682
2018854
2019228
2020600
Thereafter4,944
Total long-term debt, including current portion$7,309

18. Asset Retirement Obligationsservice, 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 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.
Asset retirement obligations primarily consistTotal stock-based compensation expense – Total employee stock-based compensation expense was $50 million, $51 million and $57 million in 2017, 2016 and 2015, while the total related income tax benefits were $19 million and $20 million in 2016 and 2015. Due to the full valuation allowance on our net federal deferred tax assets, we realized no tax benefit during 2017. During 2016 and 2015, cash received upon exercise of estimated costsstock option awards was $1 million and $9 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 2017, 2016 and 2015.
Stock option awards – During 2017, 2016 and 2015 we granted stock option awards to remove, dismantle and restore land or seabed atofficer employees. The weighted average grant date fair value of these awards was based on the end of oil and gas production operations, including bitumen mining operations. Changes in asset retirement obligations were as follows:following weighted average Black-Scholes assumptions:
 For Year Ended December 31,
(In millions)2015 2014
Beginning balance$1,958
 $2,096
Incurred liabilities, including acquisitions47
 89
Settled liabilities, including dispositions(289) (426)
Accretion expense (included in depreciation, depletion and amortization)105
 104
Revisions of estimates(132) 95
Held for sale(54) 
Ending balance$1,635
 $1,958

2017 2016 2015
Exercise price per share$15.80 $7.22 $29.06
Expected annual dividend yield1.3% 2.8% 2.9%
Expected life in years6.4
 6.3
 6.2
Expected volatility42% 36% 32%
Risk-free interest rate2.1% 1.4% 1.7%
Weighted average grant date fair value of stock option awards granted$6.07 $1.97 $6.84

The following is a summary of stock option award activity in 2017.
2015
Settled liabilities include dispositions, primarily in the Gulf
 Number Weighted Average 
Weighted Average
Remaining
 Aggregate Intrinsic Value
 of Shares Exercise Price Contractual Term (in millions)
Outstanding at beginning of year11,915,533 $27.71    
Granted799,591 $15.80    
Exercised(8,666) $7.22    
Canceled(2,375,682) $33.31    
Outstanding at end of year10,330,776 $25.52 4 years $13
Exercisable at end of year8,661,893
 $27.91 3 years $5
Expected to vest1,650,737
 $13.08 9 years $8
The intrinsic value of Mexicostock option awards exercised during 2017 and the East Texas, North Louisiana and Wilburton, Oklahoma as well as retirements in the Gulf2016 were not material. The intrinsic value of Mexico and the U.K.stock awards exercised during 2015 was $6 million.
RevisionsAs of estimates were primarily due to changes in timing of activities in the U.K. and lower estimated costs across the assets.
Held for sale isDecember 31, 2017, unrecognized compensation cost related to the Neptune field in the Gulfstock option awards was $4 million, which is expected to be recognized over a weighted average period of Mexico.one year.
Ending balance includes $34 million classified as short-term at December 31, 2015.
2014
Settled liabilities included the Norway and Angola dispositions.
Ending balance includes $41 million classified as short-term at December 31, 2014.


94

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


19. Supplemental Cash Flow InformationRestricted stock awards and restricted stock units – The following is a summary of restricted stock and restricted stock unit award activity in 2017.
 Year Ended December 31,
(In millions)2015 2014 2013
Net cash used in operating activities:     
Interest paid (net of amounts capitalized)$(325) $(279) $(289)
Income taxes paid to taxing authorities (a)
(171) (1,679) (3,904)
Net cash provided by (used in) financing activities:     
Commercial paper, net:     
Issuances$
 $2,345
 $10,870
Repayments
 (2,480) (10,935)
Commercial paper, net$
 $(135) $(65)
Noncash investing activities, related to continuing operations:     
Asset retirement cost increase (decrease)$(85) $151
 $290
Increase in capital expenditure accrual
 335
 6
Asset retirement obligations assumed by buyer251
 359
 92
 Awards 
Weighted Average
Grant Date
Fair Value
Unvested at beginning of year6,933,533
  $14.44
Granted4,198,624
 $16.13
Vested & Exercised(2,472,367) $17.67
Canceled(1,086,945) $15.03
Unvested at end of year7,572,845
  $14.24
The vesting date fair value of restricted stock awards which vested during 2017, 2016 and 2015 was $30 million, $16 million and $26 million. The weighted average grant date fair value of restricted stock awards was $14.24, $14.44 and $30.76 for awards unvested at December 31, 2017, 2016 and 2015.
As of December 31, 2017 there was $67 million of unrecognized compensation cost related to restricted stock awards which is expected to be recognized over a weighted average period of one year.
Stock-based performance unit awards – During 2017, 2016 and 2015 we granted 563,631, 1,205,517 and 382,335 stock-based performance unit awards to officers. At December 31, 2017, there were 1,510,823 units outstanding. Total stock-based performance unit awards expense was $8 million in 2017 and $6 million in 2016. We had no stock-based performance unit awards expense in 2015.
The key assumptions used in the Monte Carlo simulation to determine the fair value of stock-based performance units granted in 2017, 2016 and 2015 were:
 2017 2016 
2015 (a)
Valuation date stock price$16.93 $16.93 $16.93
Expected annual dividend yield1.2% 1.2% 1.2%
Expected volatility54% 34% 33%
Risk-free interest rate1.9% 1.7% 1.4%
Fair value of stock-based performance units outstanding$21.63 $19.86 $0.00
(a) As of December 31, 2017, there were no 2015 performance unit awards outstanding.
(a)
Income taxes paid to taxing authorities includes $1,312 million and $2,270 million in 2014, and 2013 related to discontinued operations.
20.17. Defined Benefit Postretirement Plans and Defined Contribution Plan
We have noncontributory defined benefit pension plans covering substantially all domestic employees, as well as internationalU.K. employees who were hired before April 2010. Certain employees located in the U.K and 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, a final decision was reached with 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.

95

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.    
Pension Benefits Other BenefitsPension Benefits Other Benefits
2015 2014 2015 20142017 2016 2017 2016
(In millions)U.S. Int’l U.S. Int’l U.S. U.S.U.S. Int’l U.S. Int’l U.S. U.S.
Accumulated benefit obligation518
 579
 793
 610
 260 279378
 599
 386
 583
 221 227
Change in benefit obligations:                      
Beginning balance$894
 $651
 $933
 $649
 $279
 $279
$397
 $583
 $525
 $579
 $227
 $260
Service cost29
 14
 31
 16
 3
 3
22
 
 25
 
 2
 2
Interest cost25
 25
 35
 27
 11
 13
13
 17
 16
 23
 8
 11
Plan amendment(a)
(88) 1
 
 
 
 (42)
 
 
 1
 
 (38)
Actuarial loss (gain)(b)
26
 (29) 174
 46
 (20) 42
42
 (7) 78
 139
 5
 11
Foreign currency exchange rate changes
 (35) 
 (39) 
 

 52
 
 (108) 
 
Divestiture(c)

 
 
 (29) 
 
Liability (gain)/loss due to curtailment(d)
(18) (23) 
 
 2
 
Divestiture
 
 
 
 
 
Settlements paid(335) 
 (271) 
 
 
(84) (31) (240) (36) 
 
Benefits paid(8) (25) (8) (19) (15) (16)(6) (15) (7) (15) (21) (19)
Ending balance$525
 $579
 $894
 $651
 $260
 $279
$384
 $599
 $397
 $583
 $221
 $227
Change in fair value of plan assets:                      
Beginning balance$574
 $622
 $625
 $597
 $
 $
$227
 $595
 $354
 $608
 $
 $
Actual return on plan assets8
 8
 59
 59
 
 
27
 47
 25
 129
 
 
Employer contributions115
 36
 169
 37
 15
 16
52
 17
 95
 18
 21
 20
Foreign currency exchange rate changes
 (33) 
 (39) 
 

 57
 
 (109) 
 
Divestiture(c)

 
 
 (13) 
 
Divestiture
 
 
 
 
 
Settlements paid(335) 
 (271) 
 
 
(84) (31) (240) (36) 
 
Benefits paid(8) (25) (8) (19) (15) (16)(6) (15) (7) (15) (21) (20)
Ending balance$354
 $608
 $574
 $622
 $
 $
$216
 $670
 $227
 $595
 $
 $
Funded status of plans at December 31$(171) $29
 $(320) $(29) $(260) $(279)$(168) $71
 $(170) $12
 $(221) $(227)
Amounts recognized in the consolidated balance sheets:Amounts recognized in the consolidated balance sheets:           
Noncurrent assets
 29
 
 
 
 

 71
 
 12
 
 
Current liabilities(8) 
 (11) 
 (20) (19)(6) 
 (4) 
 (21) (21)
Noncurrent liabilities(163) 
 (309) (29) (240) (260)(162) 
 (166) 
 (200) (206)
Accrued benefit cost$(171) $29
 $(320) $(29) $(260) $(279)$(168) $71
 $(170) $12
 $(221) $(227)
Pretax amounts in accumulated other comprehensive loss:Pretax amounts in accumulated other comprehensive loss:           
Net loss (gain)$171
 $61
 $283
 $91
 $14
 $34
$122
 $58
 $130
 $81
 $30
 $25
Prior service cost (credit)(65) 4
 10
 8
 (28) (41)(45) 3
 (55) 4
 (56) (63)
(a)
The plan amendment in 2015 was a freeze of the final average pay used in the legacy formula of the defined benefit pension plan. Activity in 2014 represents a change in plan design related to the health care benefits provided under the postretirement plan.
(b)
Activity in 2014 includes the increase in the U.S. pension and postretirement benefit obligations of $13 million and $15 million respectively, due to the adoption of the 2014 mortality table.
(c)
Related to the sale of our Norway business in the fourth quarter of 2014.
(d)
Related to workforce reductions, which reduced the future expected years of service for employees participating in the plans and the impact of discontinuing accruals for future benefits under the U.K. pension plan effective December 31, 2015.



96

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.
Pension Benefits Other BenefitsPension Benefits Other Benefits
Year Ended December 31, Year Ended December 31,Year Ended December 31, Year Ended December 31,
2015 2014 2013 2015 2014 20132017 2016 2015 2017 2016 2015
(In millions)U.S. Int’l U.S. Int’l U.S. Int’l U.S. U.S. U.S.U.S. Int’l U.S. Int’l U.S. Int’l U.S. U.S. U.S.
Components of net periodic benefit cost:                                  
Service cost$29
 $14
 $31
 $16
 $33
 $17
 $3
 $3
 $4
$22
 $
 $25
 $
 $29
 $14
 $2
 $2
 $3
Interest cost25
 25
 35
 27
 40
 23
 11
 13
 12
13
 17
 16
 23
 25
 25
 8
 11
 11
Expected return on plan assets(30) (37) (34) (32) (43) (24) 
 
 
(13) (30) (18) (35) (30) (37) 
 
 
Amortization:                                  
- prior service cost (credit)(7) 1
 5
 1
 6
 1
 (4) (6) (6)(10) 
 (10) 1
 (7) 1
 (7) (3) (4)
- actuarial loss22
 2
 29
 1
 43
 4
 1
 
 
8
 1
 14
 
 22
 2
 
 
 1
Net curtailment loss (gain)(a)
(5) 4
 
 
 
 
 (7) 
 

 
 
 
 (5) 4
 
 
 (7)
Net settlement loss(b)
119
 
 99
 
 45
 
 
 
 
28
 4
 97
 6
 119
 
 
 
 
Net periodic benefit cost(c)
$153
 $9
 $165
 $13
 $124
 $21
 $4
 $10
 $10
$48
 $(8) $124
 $(5) $153
 $9
 $3
 $10
 $4
Other changes in plan assets and benefit obligations recognized in other comprehensive (income) loss (pretax):                                  
Actuarial loss (gain)(d)
$30
 $(25) $149
 $33
 $(161) $(15) $(21) $42
 $(31)$28
 $(26) $70
 $41
 $30
 $(25) $5
 $11
 $(21)
Amortization of actuarial gain (loss)(134) (2) (128) (1) (88) (4) (1) 
 
(36) (4) (111) (6) (134) (2) 
 
 (1)
Prior service cost (credit)(89) 1
 
 
 
 
 
 (42) 

 
 
 1
 (89) 1
 
 (38) 
Amortization of prior service credit (cost)7
 (5) (5) (1) (6) (1) 13
 6
 6
10
 
 10
 (1) 7
 (5) 7
 3
 13
Total recognized in other comprehensive (income) loss$(186) $(31) $16
 $31
 $(255) $(20) $(9) $6
 $(25)$2
 $(30) $(31) $35
 $(186) $(31) $12
 $(24) $(9)
Total recognized in net periodic benefit cost and other comprehensive (income) loss$(33) $(22) $181
 $44
 $(131) $1
 $(5) $16
 $(15)$50
 $(38) $93
 $30
 $(33) $(22) $15
 $(14) $(5)
(a) 
Related to workforce reductions, which reduced the future expected years of service for employees participating in the plans and the impact of discontinuing accruals for future benefits under the U.K. pension plan effective December 31, 2015.
(b) 
Settlement losses are recorded when lump sum payments from a plan in a period exceed the plan’s total service and interest costs for the period. Such settlements occurred in one or more of our U.S. pension plans in all periods presented.
(c) 
Net periodic benefit cost reflects a calculated market-related value of plan assets which recognizes changes in fair value over three years.
(d)
Activity in 2014 includes the impact of the sale of our Norway business in the fourth quarter of 2014.
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 20162018 are $12$13 million and $11$10 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 2016 is $32018 are $1 million and $7 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 2015, 20142017, 2016 and 2013.2015.
Pension Benefits Other BenefitsPension Benefits Other Benefits
2015 2014 2013 2015 2014 20132017 2016 2015 2017 2016 2015
(In millions)U.S. Int’l U.S. Int’l U.S. Int’l U.S. U.S. U.S.U.S. Int’l U.S. Int’l U.S. Int’l U.S. U.S. U.S.
Weighted average assumptions used to determine benefit obligation:                                  
Discount rate4.04% 3.90% 3.71% 3.70% 4.28% 4.60% 4.36% 4.01% 4.85%3.55% 2.50% 4.02% 2.70% 4.04% 3.90% 3.54% 3.98% 4.36%
Rate of compensation increase (a)
4.00% 
 4.00% 3.60% 5.00% 4.90% 4.00% 4.00% 5.00%4.00% 
 4.00% 
 4.00% 
 4.00% 4.00% 4.00%
Weighted average assumptions used to determine net periodic benefit cost:                                  
Discount rate3.79% 3.70% 3.98% 4.60% 3.79% 4.40% 3.93% 4.69% 4.06%3.86% 2.70% 3.66% 3.90% 3.79% 3.70% 3.98% 4.36% 3.93%
Expected long-term return on plan assets6.75% 5.70% 6.75% 5.70% 7.25% 4.90% 
 
 
6.50% 4.50% 6.75% 5.50% 6.75% 5.70% 
 
 
Rate of compensation increase(a)4.00% 3.60% 5.00% 4.90% 5.00% 4.50% 4.00% 5.00% 5.00%4.00% 
 4.00% % 4.00% 3.60% 4.00% 4.00% 4.00%
(a) 
No future benefits will be incurred for the UKU.K. plan after December 31, 2015. Therefore, rate of compensation increase is no longer applicable to this plan.

97

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
2015 2014 20132017 2016 2015
Initial health care trend rate8.00% 6.88% 6.89%8.00% 8.25% 8.00%
Ultimate trend rate4.50% 5.00% 5.00%4.70% 4.50% 4.50%
Year ultimate trend rate is reached2024
 2024
 2020
2025
 2025
 2024
Employer provided subsidysubsidies for post-65 retiree health care coverage will only increase by the consumer price index (not to exceed 4%) each year.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. 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.
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 61%55% equity securities and 39%45% fixed income securities. The plan assets are invested in eightten 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, 20152017 and 2014.2016.
Cash and cash equivalents – Cash and cash equivalents are valued using a market approach and are considered Level 1. This investment also includes a cash reserve account (a collective short-term investment fund) that is valued using an income approach and is considered Level 2.
Equity securities -Investments in common stock and preferred stock and real estate investment trusts ("REIT") 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. These private equity investments are considered Level 3. Investments in mutual funds are valued using a market approach. The shares or units held are traded on the public exchanges and are therefore considered Level 1. Investments in pooled funds are valued using a market approach at the net asset value ("NAV") of units held. The various funds consist of either an equity or fixed income investment portfolio with underlying investments held in U.S. and non-U.S. securities. Nearly all of the underlying investments are publicly-traded. The majority of the pooled funds are benchmarked against a relative public index. These are considered Level 2.
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, non-U.S. government bonds, private placements, taxable municipals, GNMA/FNMA pools, and otherYankee bonds 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 bondsfixed income investments include futures contracts, real estate investment trusts, credit default, zero coupon, and interest rate swaps. The investment in the commingled

98

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


primarily consist of securities issued by governmental agencies and municipalities. The investment in the commingled fundfunds is valued using the NAV of units held and is considered Level 2.as a practical expedient. The commingled fund consistsfunds consist of an equity and fixed income portfolioportfolios with underlying investments held in U.S. and non-U.S. securities. Pooled funds primarily have investments held in U.S. and non-U.S. publicly traded investment grade government and corporate bonds.bonds and are considered Level 2.
Other – Other investments are comprised ofan international insurance carrier contract and the majority of the underlying investments consist of a mix of non-U.S. publicly traded equity securities valued at the closing price reported in an active market and fixed income securities valued using calculated yield curves.  This asset is considered Level 2. The other investments, an unallocated annuity contract, two limited liability companies, and real estate and U.S. treasury futures. All are considered Level 3, as significant inputs to determine fair value are unobservable.
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, 20152017 and 2014.2016.
December 31, 2015December 31, 2017
(In millions)Level 1 Level 2 Level 3 TotalLevel 1 Level 2 Level 3 Total
U.S. Int’l U.S. Int’l U.S. Int’l U.S. Int’lU.S. Int’l U.S. Int’l U.S. Int’l U.S. Int’l
Cash and cash equivalents$47
 $6
 $1
 $
 $
 $
 $48
 $6
$6
 $1
 $
 $
 $
 $
 $6
 $1
Equity securities:                              
Common and preferred stock115
 
 
 
 
 
 115
 
REIT and private equity1
 
 
 
 23
 
 24
 
Common stock81
 
 
 
 
 
 81
 
Private equity
 
 
 
 16
 
 16
 
Mutual and pooled funds
 218
 
 152
 
 
 
 370

 151
 
 115
 
 
 
 266
Fixed income securities:                              
U.S. treasury notes and ETFs12
 
 
 
 
 
 12
 
Corporate and other bonds
 
 105
 
 
 
 105
 
Commingled and pooled funds
 
 23
 232
 
 
 23
 232
REIT and swaps
 
 2
 
 
 
 2
 
Corporate
 
 6
 
 
 
 6
 
Exchange traded funds5
 
 
 
 
 
 5
 
Government19
 
 2
 
 3
 
 24
 
Pooled funds
 
 
 403
 
 
 
 403
Other
 
 
 
 25
 
 25
 

 
 
 
 19
 
 19
 
Total investments, at fair value$175
 $224
 $131
 $384
 $48
 $
 $354
 $608
111
 152
 8
 518
 38
 
 157
 670
Commingled funds (a)

 
 
 
 
 
 59
 
Total investments$111
 $152
 $8
 $518
 $38
 $
 $216
 $670
December 31, 2014December 31, 2016
(In millions)Level 1 Level 2 Level 3 TotalLevel 1 Level 2 Level 3 Total
U.S. Int’l U.S. Int’l U.S. Int’l U.S. Int’lU.S. Int’l U.S. Int’l U.S. Int’l U.S. Int’l
Cash and cash equivalents$26
 $1
 $
 $
 $
 $
 $26
 $1
$8
 $5
 $
 $
 $
 $
 $8
 $5
Equity securities:                              
Common and preferred stock230
 
 
 
 
 
 230
 
REIT and private equity
 
 
 
 25
 
 25
 
Common stock82
 
 
 
 
 
 82
 
Private equity
 
 
 
 20
 
 20
 
Mutual and pooled funds
 221
 
 164
 
 
 
 385

 201
 
 159
 
 
 
 360
Fixed income securities:                              
U.S. treasury notes and ETFs33
 
 
 
 
 
 33
 
Corporate and other bonds
 
 190
 
 
 
 190
 
Commingled and pooled funds
 
 40
 236
 
 
 40
 236
Corporate
 
 52
 
 
 
 52
 
Exchange traded funds5
 
 
 
 
 
 5
 
Government6
 
 19
 
 
 
 25
 
Pooled funds
 
 
 230
 
 
 
 230
Other
 
 
 
 30
 
 30
 

 
 
 
 21
 
 21
 
Total investments, at fair value$289
 $222
 $230
 $400
 $55
 $
 $574
 $622
101
 206
 71
 389
 41
 
 213
 595
Commingled funds (a)

 
 
 
 
 
 14
 
Total investments$101
 $206
 $71
 $389
 $41
 $
 $227
 $595

(a)
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, 20152017 and 2014,2016, for the assets using Level 3 fair value measurements was immaterial.


99

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


Cash flows
Estimated future benefit payments – The following gross benefit payments, which were estimated based on actuarial assumptions applied at December 31, 20152017 and reflect expected future services, as appropriate, are to be paid in the years indicated.
Pension Benefits Other BenefitsPension Benefits Other Benefits
(In millions)U.S. Int’l U.S.U.S. Int’l U.S.
2016$61
 $16
 $21
201761
 17
 21
201859
 20
 20
$43
 $17
 $21
201955
 21
 20
40
 18
 20
202053
 22
 20
37
 17
 20
2021 through 2025224
 125
 89
202133
 19
 19
202230
 21
 18
2023 through 2027123
 118
 74
Contributions to defined benefit plans – We expect to make contributions to the funded pension plans of up to $62$65 million in 2016.2018. Cash contributions to be paid from our general assets for the unfunded pension and postretirement plans are expected to be approximately $8$6 million and $21 million in 2016.2018.
Contributions to defined contribution plans – We contribute to several defined contribution plans for eligible employees. Contributions to these plans totaled $20 million, $25$20 million and $27$20 million in 2015, 20142017, 2016 and 2013.
Additional Severance Obligation – We expect to make severance payments of approximately $8 million in 2016 related to the workforce reduction in 2015.
21. Incentive Based Compensation
Description of stock-based compensation plans – The Marathon Oil Corporation 2012 Incentive Compensation Plan (the "2012 Plan") was approved by our stockholders in April 2012 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 2012 Plan also allows us to provide equity compensation to our non-employee directors. No more than 50 million shares of our common stock may be issued under the 2012 Plan. For stock options and SARs, the number of shares available for issuance under the 2012 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 2012 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 2012 Plan that are forfeited, are terminated or expire unexercised become available for future grants. In addition, the number of shares of our common stock reserved for issuance under the 2012 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 2012 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 2012 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 2012 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, 2015, there are no SARs outstanding.
Restricted stock – We grant restricted stock under the 2012 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 – Beginning in 2013, we grant stock-based performance units to officers under the 2012 Plan. At the grant date, each unit represents the value of one share of our common stock. These units are settled in cash, and

100

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


the amount of the payment is based on (1) the vesting percentage, which can be from zero to 200% based on performance achieved and (2) the value of our common stock on the date vesting is determined by the Compensation Committee of the Board of Directors. 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.
Restricted stock units – We maintain an equity compensation program for our non-employee directors under the 2012 Plan.  All non-employee directors receive annual grants of common stock units. Common shares will be issued for units granted on or after January 1, 2012 upon completion of board service or three years from the date of grant, whichever is earlier. 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. 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 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 $57 million, $70 million and $70 million in 2015, 2014 and 2013, while the total related income tax benefits were $20 million, $25 million and $25 million in the same years. In 2015, 2014 and 2013, cash received upon exercise of stock option awards was $9 million, $136 million and $58 million. Tax benefits realized for deductions for stock awards settled during 2014 and 2013 totaled $51 million and $36 million. There were no tax benefits realized for deductions for stock awards settled during 2015.
Stock option awards – During 2015, we granted stock option awards to officer employees. During 2014 and 2013, we granted stock option awards to both officer and non-officer employees. The weighted average grant date fair value of these awards was based on the following weighted average Black-Scholes assumptions:

2015 2014 2013
Exercise price per share$29.06 $34.49 $33.54
Expected annual dividend yield2.9% 2.3% 2.1%
Expected life in years6.2
 5.9
 6.1
Expected volatility32% 38% 38%
Risk-free interest rate1.7% 1.8% 1.6%
Weighted average grant date fair value of stock option awards granted$6.84 $10.50 $10.25
The following is a summary of stock option award activity in 2015.
 Number Weighted Average 
Weighted Average
Remaining
 Average Intrinsic Value
 of Shares Exercise Price Contractual Term (in millions)
Outstanding at beginning of year13,427,836 $29.68    
Granted724,082 $29.06    
Exercised(553,401) $16.85    
Canceled(933,098) $32.99    
Outstanding at end of year12,665,419 $29.97 4 years $
Exercisable at end of year10,654,799
 $29.50 3 years $
Expected to vest1,996,175
 $32.45 8 years $
The intrinsic value of stock option awards exercised during 2015, 2014 and 2013 was $6 million, $83 million and $35 million.
As of December 31, 2015, unrecognized compensation cost related to stock option awards was $9 million, which is expected to be recognized over a weighted average period of one year.

101

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


Restricted stock awards and restricted stock units – The following is a summary of restricted stock and restricted stock unit award activity in 2015.
 Awards 
Weighted Average
Grant Date
Fair Value
Unvested at beginning of year3,448,353
  $34.04
Granted2,994,558
 $28.90
Vested & Exercised(1,350,344) $33.40
Canceled(1,075,223) $32.70
Unvested at end of year4,017,344
  $30.76
The vesting date fair value of restricted stock awards which vested during 2015, 2014 and 2013 was $26 million, $70 million and $59 million. The weighted average grant date fair value of restricted stock awards was $30.76, $34.04 and $31.80 for awards unvested at December 31, 2015, 2014 and 2013.
As of December 31, 2015 there was $86 million of unrecognized compensation cost related to restricted stock awards which is expected to be recognized over a weighted average period of one year.
Stock-based performance unit awards – During 2015, 2014 and 2013 we granted 382,335, 221,491 and 353,600 stock-based performance unit awards to officers. At December 31, 2015, there were 584,566 units outstanding.
The key assumptions used in the Monte Carlo simulation to determine the fair value of stock-based performance units granted in 2015, 2014 and 2013 were:
 2015 2014 2013
Valuation date stock price$12.59 $12.59 $12.98
Expected annual dividend yield1.5% 1.5% 1.5%
Expected volatility37% 46% 62%
Risk-free interest rate1.1% 0.7% 0.1%
Fair value of stock-based performance units outstanding$7.08 $6.04 $0.18
Cash-based performance unit awards – Prior to 2013, cash-based performance unit awards were granted to officers that provide a cash payment upon the achievement of certain performance goals at the end of a defined measurement period. The performance goals are tied to our TSR as compared to TSR for a group of peer companies determined by the Compensation Committee of the Board of Directors. The target value of each performance unit is $1, with a maximum payout of $2 per unit, but the actual payout could be anywhere between zero and the maximum. Because performance units are to be settled in cash at the end of the performance period, they are accounted for as liability awards.
During 2012, we granted 12.7 million performance units, all having a 36-month performance period. During the third quarter of 2011, we granted 15 million performance units, a portion of which had a 30-month performance period and a portion of which had an 18-month performance period to reflect the remaining periods of the original 2011 and 2010 performance unit grants outstanding prior to the spin-off. Compensation expense associated with cash-based performance units was $5 million and $9 million in 2014 and 2013. At December 31, 2014 all performance periods ended and no additional units have been granted.

102

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


22.18.  Reclassifications Out of Accumulated Other Comprehensive Loss
The following table presents a summary of amounts reclassified from accumulated other comprehensive loss to income (loss) from continuing operations in their entirety:loss:
Year Ended December 31, Year Ended December 31, 
(In millions)20152014 Income Statement Line2017 2016 Income Statement Line
Postretirement and postemployment plansPostretirement and postemployment plans      
Amortization of actuarial loss$(24)$(30) General and administrative$(9) $(14) General and administrative
Net settlement loss(119)(99) General and administrative(32) (103) General and administrative
Net curtailment gain8

 General and administrative
Derivative hedges    
Recognized gain on terminated derivative hedge46
 
 Net interest and other
Ineffective portion of derivative hedge1
 4
 Net interest and other
(135)(129) Income (loss) from operations6
 (113) Income (loss) from operations
51
62
 Provision for income taxes(40) 41
 (Provision) benefit for income taxes
Other insignificant items, net of tax
(1) 
Total reclassifications$(84)$(68) Income (loss) from continuing operations
Total reclassifications to expense, net of tax$(34) $(72) Income (loss) from continuing operations
Foreign currency hedges    
Net recognized loss in discontinued operations, net of tax(30) 
 Income (loss) from discontinued operations
Total reclassifications to expense$(64) $(72) 
19. Supplemental Cash Flow Information
 Year Ended December 31,
(In millions)2017 2016 2015
Net cash used in operating activities:     
Interest paid (net of amounts capitalized)$(379) $(375) $(325)
Income taxes paid to taxing authorities  (a)
(391) (84) (171)
Noncash investing activities, related to continuing operations:     
Changes in asset retirement costs$(202) $110
 $(95)
Asset retirement obligations assumed by buyer14
 40
 251
Increase in capital expenditure accrual176
 
 
Notes receivable for disposition of assets748
 
 
(a) Includes a payment of $108 million made to U.K. taxing authorities to preserve our appeal rights, see Note 7 - Income Taxes for additional discussion.
20. Other Items
Net interest and other
 Year Ended December 31,
(In millions)2017 2016 2015
Interest:     
Interest income$34
 $14
 $9
Interest expense(380) (398) (350)
Income on interest rate swaps53
 13
 11
Interest capitalized3
 18
 19
Total interest(290) (353) (311)
Other:     
Net foreign currency gain (loss)8
 6
 4
Other12
 15
 21
Total other20
 21
 25
Net interest and other$(270) $(332) $(286)

Foreign currency – Aggregate foreign currency gains (losses) were included in the consolidated statements of income as follows:
 Year Ended December 31,
(In millions)2017 2016 2015
Net interest and other$8
 $6
 $4
Provision for income taxes57
 (32) (11)
Aggregate foreign currency gains (losses)$65
 $(26) $(7)

23.
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


21. Equity Method Investments and Related Party Transactions
During 2017, 2016 and 2015 only our equity method investees were considered related parties and they 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:
 Ownership as of December 31,
(In millions)December 31, 2017 2017 2016
EGHoldings60% $456
 $550
Alba Plant LLC52% 214
 215
AMPCO45% 177
 165
Other investments  
 1
Total  $847
 $931
Dividends and partnership distributions received from equity method investees (excluding distributions that represented a return of capital previously contributed) were $276 million in 2017, $192 million in 2016 and $178 million in 2015.
Summarized financial information for equity method investees is as follows:
(In millions)2017 2016 2015
Income data – year (a):
     
Revenues and other income$1,294
 $770
 $769
Income from operations631
 346
 313
Net income508
 313
 280
Balance sheet data – December 31:     
Current assets$586
 $525
  
Noncurrent assets1,044
 1,173
  
Current liabilities221
 218
  
Noncurrent liabilities94
 47
  
(a)
See Item 15 Exhibits, Financial Statement Schedules which contains the Alba Plant LLC audited financial statements, which have been included pursuant to Rule 3-09 of Regulation S-X.
Revenues from related parties were $60 million, $54 million and $51 million in 2017, 2016 and 2015, with the majority related to EGHoldings in all years. Purchases from related parties were $132 million, $103 million and $207 million in 2017, 2016 and 2015 with the majority related to Alba Plant LLC in all years.
Current receivables from related parties at December 31, 2017 and 2016, were $24 million, and $23 million. Payables to related parties were $14 million and $11 million at December 31, 2017 and 2016, with the majority related to Alba Plant LLC.
22. Stockholders’ Equity
In 2014March 2016, we acquired 29 millionissued 166,750,000 shares of our common sharesstock, par value $1 per share, at a costprice of $1 billion$7.65 per share, excluding underwriting discounts and commissions, for net proceeds of $1,236 million. The proceeds were used to strengthen our balance sheet and for general corporate purposes, including funding a portion of our Capital Development Program.
There were no share repurchases during 2017 or 2016 under our share repurchase program, initially authorized in 2006, bringing our total repurchases to 121 million common shares at a cost of $4.7 billion.publicly announced plans or programs. As of December 31, 20152017 the total remaining share repurchase authorization was $1.5 billion. Purchases under the program 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.
24.
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


23. 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 capital lease obligations and for operating lease obligations having noncancellable lease terms in excess of one year are as follows:
(In millions)
Capital
Lease
Obligations
 
Operating
Lease
Obligations
Operating Lease Obligations
2016$1
 $30
20171
 26
20181
 24
$29
20191
 24
28
20201
 24
27
202126
20225
Later years16
 30
4
Sublease rentals
 (1)
Total minimum lease payments$21
 $157
$119
Less imputed interest costs(12)  
Present value of net minimum lease payments$9
  
* Future minimum commitments for capital lease obligations are nil as of December 31, 2017.
Operating lease rental expense related to continuing operations was $104$87 million, $120$87 million and $105$99 million in 2015, 20142017, 2016 and 2013.2015. 

103

MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


25.24. 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 third quarter of 2017, a hearing took place at the U.K.’s First-tier Tribunal with respect to this tax deduction.  In the fourth quarter of 2017, we received notification from the U.K.’s First-tier Tribunal that the judge sided with the U.K. tax authorities with respect to the timing of the decommissioning cost deductions.  We intend to appeal this decision and estimate that any revisions to current and deferred tax liabilities, if we do not prevail in the appeals process, would have no cumulative adverse earnings impact on our consolidated results of operations.  In accordance with U.K. regulations, we have paid the amount of tax and interest in question, approximately $108 million, prior to our appeal.  As a result of the negative ruling we no longer consider this position to be more-likely-than-not to be sustained and have created an uncertain tax position related to the Brae area decommissioning costs.  The payment of the tax and interest to the U.K. tax authorities is not to settle the position, but a regulatory requirement to appeal in the U.K.  If we ultimately prevail in appeals, the U.K. tax authorities will refund the tax and interest, however, if we ultimately lose in appeals no material future payments related to this issue will be required.  See Note 7 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.
We are a defendant in a number of lawsuitslegal 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 that 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 are subjecthave incurred and will continue to incur capital, operating and maintenance, and remediation expenditures as a result of federal, state, local and foreign laws and regulations relating to the environment. 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. 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, 20152017 and 2014,2016, accrued liabilities for remediation were not significant.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.
MARATHON OIL CORPORATION
Notes to Consolidated Financial Statements


Guarantees We have entered into a performance guarantee related to asset retirement obligations with aggregate maximum potential undiscounted payments totaling $31$35 millionas of December 31, 2015.2017. Under the terms of this guarantee arrangement, we would be required to perform should the guaranteed party fail to fulfill its obligations under the specified arrangements.
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 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, 20152017 and 2014,2016, contractual commitments to acquire property, plant and equipment totaled $371$102 million and $747$144 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.

104



Select Quarterly Financial Data (Unaudited)




2015 20142017 2016
(In millions, except per share data)1st Qtr. 2nd Qtr. 3rd Qtr. 4th Qtr. 1st Qtr. 2nd Qtr. 3rd Qtr. 4th Qtr.1st Qtr. 2nd Qtr. 3rd Qtr. 4th Qtr. 1st Qtr. 2nd Qtr. 3rd Qtr. 4th Qtr.
Revenues$1,484
 $1,490
 $1,384
 $1,164
 $2,690
 $2,888
 $2,870
 $2,398
$988
 $993
 $1,162
 $1,230
 $612
 $761
 $861
 $936
Income (loss) from continuing operations before income taxes(a)(420) (392) (1,145) (1,001) 598
 511
 453
 (201)(16) (112) (458) 132
 (613) (192) (313) (46)
Income (loss) from continuing operations(276) (386) (749) (793) 398
 360
 304
 (93)(50) (153) (599) (28) (360) (138) (206) (1,383)
Discontinued operations (a)(b)

 
 
 
 751
 180
 127
 1,019
(4,907) 14
 
 
 (47) (32) 14
 12
Net income (loss)(c)$(276) $(386) $(749) $(793) $1,149
 $540
 $431
 $926
$(4,957) $(139) $(599) $(28) $(407) $(170) $(192) $(1,371)
               
Income (loss) per share:                              
Basic:               
Continuing operations$(0.41) $(0.57) $(1.11) $(1.17) $0.58 $0.53 $0.45 $(0.14)$(0.06) $(0.18) $(0.70) $(0.03) $(0.49) $(0.16) $(0.24) $(1.63)
Discontinued operations (a)

 
 
 
 $1.08 $0.27 $0.19 $1.51
Net income (loss)($0.41) ($0.57) ($1.11) ($1.17) $1.66 $0.80 $0.64 $1.37
Diluted:               
Continuing operations($0.41) ($0.57) ($1.11) ($1.17) $0.57 $0.53 $0.45 ($0.14)
Discontinued operations (a)

 
 
 
 $1.08 $0.27 $0.19 $1.51
Net income (loss)($0.41) ($0.57) ($1.11) ($1.17) $1.65 $0.80 $0.64 $1.37
Discontinued operations (b)
$(5.78) $0.02
 $
 $
 $(0.07) $(0.04) $0.01
 $0.01
Basic net income (loss)$(5.84) $(0.16) $(0.70) $(0.03) $(0.56) $(0.20) $(0.23) $(1.62)
Dividends paid per share$0.21 $0.21 $0.21 $0.05 $0.19 $0.19 $0.21 $0.21$0.05
 $0.05
 $0.05
 $0.05
 $0.05
 $0.05
 $0.05
 $0.05
(a) We closed the sale of our Angola assets in the first quarter of 2014 and our Norway business in the fourth quarter of 2014. The Angola assets and Norway business are reflected as discontinued operations in 2014.

105

(a)
Includes impairments to proved properties of $24 million and $201 million in the fourth and third quarter of 2017 and $47 million in the third quarter of 2016. Also includes unproved property impairments and exploratory dry well costs of $215 million in the third quarter of 2017 and $118 million in the second quarter of 2016. (See Item 8. Financial Statements and Supplementary Data – Note 13 to the consolidated financial statements).
(b)
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.
(c)
Includes the increase of a valuation allowance on certain of our deferred tax assets for $1,346 million in the fourth quarter of 2016 (see Item 8. Financial Statements and Supplementary Data – Note 9 to the consolidated financial statements).


Supplementary Information on Oil and Gas Producing Activities (Unaudited)


The supplementary information is disclosed by the following geographic areas: the U.S.; Canada; E.G.; Libya; Other Africa, which primarily includes activities in Gabon, Kenya, Ethiopia and Libya;Gabon; and Other International ("Other Int’l"), which includes the U.K. and the Kurdistan Region of Iraq. We closed the sale of our Angola assets and our NorwayCanada business in 2014,2017 and both are shownhave reflected this business as discontinued operations ("Disc Ops") in all periods presented. See Note 5 for further details on our Canadian disposition.
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 31 years with Marathon Oil, he has held numerous engineering and management positions, including more recently 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.
Historical estimates of synthetic crude oil reserves were prepared by GLJ Petroleum Consultants of Calgary, Alberta, Canada, third-party consultants for 2015. Their report was filed as an exhibit to the prior periods.year Annual Report on Form 10-K. The individual responsible for the estimates of our synthetic crude oil reserves had 15 years of experience in petroleum engineering, has conducted surface mineable oil sands evaluations since 2009 and is a registered Practicing Professional Engineer in the Province of Alberta.
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, 2017, with 84% 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 2017, 2016 or 2015.
During 2017, 2016 and 2015, Netherland, Sewell & Associates, Inc. prepared a reserves certification for the Alba field in E.G. The NSAI summary reports are 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 13 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 11 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 2017, 2016 and 2015. Their summary reports are filed as exhibits to this Annual Report on Form 10-K. The team lead for Ryder Scott has over 35 years of industry experience, having worked for a major financial advisory services group before joining Ryder Scott. He is a 26 year member of SPE and is a registered Professional Engineer in the State of Texas.


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, Cash Flows and Liquidity – Critical Accounting Estimates – Estimated Quantities of Net Reserves. For a discussionReserves for the table providing our 2017 SEC pricing of our reserve estimation process, includingbenchmark prices and the use of third-party audits, see Item 1. Business – Reserves.underlying assumptions used.
Our December 31, 2015 proved reserves were calculated using the SEC pricing. The table below provides the 20152017 SEC pricing of thefor certain benchmark prices as well as the unweighted average for the first two months of 2016:
prices:
 SEC Pricing 20152-month Average 2016
WTI Crude oil$50.28
$34.19
Henry Hub natural gas$2.59
$2.28
Brent crude oil$54.25
$34.86
Natural gas liquids$17.32
$12.87
 SEC Pricing 2017
WTI Crude oil (per bbl)$51.34
Henry Hub natural gas (per mmbtu)$2.98
Brent crude oil (per bbl)$54.39
Mont Belvieu NGLs (per bbl)$22.03
When determining the December 31, 2015 proved reserves for each property, the SEC prices listed above were adjusted using price differentials that account for property-specific quality and location differences.
Beginning in the second half of 2014, the crude oil and natural gas benchmarks began to decline and these declines continued through 2015 and into 2016. Commodity prices are likely to remain volatile based on global supply and demand and could decline further. Sustained reduced commodity prices could have a material effect on the quantity and future cash flows of our proved reserves.
Estimates of future cash flows associated with proved reserves are based on actual costs of developing and producing the reserves as of the end of the year. The decline in commodity prices prompted a concerted effort to reduce the costs of developing and producing reserves. Therefore, the impact of sustained reduced commodity prices on future cash flows will be partially offset by the resulting lower costs to develop and produce reserves.
A sustained period of lower commodity prices could also cause us to decrease our near term capital programs and defer investments until prices improve. A shifting of capital expenditures into future periods beyond five years from the initial proved reserve booking could potentially lead to a reduction in proved undeveloped reserves. See Item 1A. Risk Factors for a further discussion of how a substantial extended decline in commodity prices could impact us.


106





































Supplementary Information on Oil and Gas Producing Activities (Unaudited)


Estimated Quantities of Proved Oil and Gas Reserves (continued)
(mmbbl)U.S. Canada 
E.G.(a)
 
Other
Africa
 Other Int'l Cont Ops Disc Ops TotalU.S. 
E.G.(a)
 Libya Other Int'l Cont Ops Disc Ops Total
Crude oil and condensate                            
Proved developed and undeveloped reserves:
Beginning of year - 2013387
 
 72
 209
 24
 692
 82
 774
Beginning of year - 2015634
 57
 208
 29
 928
 
 928
Revisions of previous estimates33
 
 (1) 12
 6
 50
 19
 69
(57) 2
 (7) (2) (64) 
 (64)
Improved recovery
 
 
 
 
 
 11
 11
1
 
 
 
 1
 
 1
Purchases of reserves in place12
 
 
 
 
 12
 
 12

 
 
 
 
 
 
Extensions, discoveries and        

 

                 
other additions112
 
 1
 3
 
 116
 8
 124
70
 
 
 
 70
 
 70
Production(46) 
 (8) (9) (5) (68) (29) (97)(62) (7) 
 (5) (74) 
 (74)
Sales of reserves in place(1) 
 
 
 
 (1) 
 (1)(6) 
 
 
 (6) 
 (6)
End of year - 2013497
 
 64
 215
 25
 801
 91
 892
End of year - 2015580
 52
 201
 22
 855
 
 855
Revisions of previous estimates36
 
 (1) (4) 1
 32
 10
 42
55
 1
 (28) 3
 31
 
 31
Improved recovery2
 
 
 
 
 2
 
 2
4
 
 
 
 4
 
 4
Purchases of reserves in place6
 
 
 
 
 6
 
 6
12
 
 
 
 12
 
 12
Extensions, discoveries and        

 

   

             
other additions153
 
 1
 
 7
 161
 3
 164
37
 
 
 1
 38
 
 38
Production(57) 
 (7) (3) (4) (71) (17) (88)(48) (8) (1) (4) (61) 
 (61)
Sales of reserves in place(3) 
 
 
 
 (3) (87) (90)(77) 
 
 
 (77) 
 (77)
End of year - 2014634
 
 57
 208
 29
 928
 
 928
End of year - 2016563
 45
 172
 22
 802
 
 802
Revisions of previous estimates(109) 
 2
 (7) (2) (116) 
 (116)9
 (2) 
 8
 15
 
 15
Improved recovery1
 
 
 
 
 1
 
 1

 
 
 
 
 
 
Purchases of reserves in place18
 
 
 
 18
 
 18
Extensions, discoveries and        

 

   

             
other additions122
 
 
 
 
 122
 
 122
30
 4
 
 
 34
 
 34
Production(62) 
 (7) 
 (5) (74) 
 (74)(49) (8) (7) (4) (68) 
 (68)
Sales of reserves in place(6) 
 
 
 
 (6) 
 (6)(1) 
 
 
 (1) 
 (1)
End of year - 2017570
 39
 165
 26
 800
 
 800
Proved developed reserves:             
Beginning of year - 2015294
 30
 175
 19
 518
 
 518
End of year - 2015580
 
 52
 201
 22
 855
 
 855
327
 25
 173
 16
 541
 
 541
Proved developed reserves:               
Beginning of year - 2013169
 
 45
 168
 20
 402
 63
 465
End of year - 2013241
 
 37
 176
 19
 473
 77
 550
End of year - 2014294
 
 30
 175
 19
 518
 
 518
End of year - 2016238
 45
 172
 13
 468
 
 468
End of year - 2017263
 39
 165
 17
 484
 
 484
Proved undeveloped reserves:             
Beginning of year - 2015340
 27
 33
 10
 410
 
 410
End of year - 2015327
 
 25
 173
 16
 541
 
 541
253
 27
 28
 6
 314
 
 314
Proved undeveloped reserves:               
Beginning of year - 2013218
 
 27
 41
 4
 290
 19
 309
End of year - 2013256
 
 27
 39
 6
 328
 14
 342
End of year - 2014340
 
 27
 33
 10
 410
 
 410
End of year - 2015253
 
 27
 28
 6
 314
 
 314
End of year - 2016325
 
 
 9
 334
 
 334
End of year - 2017307
 
 
 9
 316
 
 316
 





107








Supplementary Information on Oil and Gas Producing Activities (Unaudited)


Estimated Quantities of Proved Oil and Gas Reserves (continued)
(mmbbl)U.S. Canada 
E.G.(a)
 
Other
Africa
 Other Int'l Cont Ops Disc Ops TotalU.S. 
E.G.(a)
 Libya Other Int'l Cont Ops Disc Ops Total
Natural gas liquids                            
Proved developed and undeveloped reserves:
Beginning of year - 201388
 
 38
 
 1
 127
 
 127
Revisions of previous estimates13
 
 
 
 
 13
 
 13
Purchases of reserves in place2
 
 
 
 
 2
 
 2
Extensions, discoveries and        

 

   

other additions25
 
 
 
 
 25
 
 25
Production(9) 
 (4) 
 
 (13) 
 (13)
End of year - 2013119
 
 34
 
 1
 154
 
 154
Beginning of year - 2015161
 30
 
 1
 192
 
 192
Revisions of previous estimates4
 
 
 
 
 4
 
 4
(7) 2
 
 (1) (6) 
 (6)
Improved recovery1
 
 
 
   1
 
 1

 
 
 
 
 
 
Extensions, discoveries and        

 

   

other additions48
 
 
 
 
 48
 
 48
Production(11) 
 (4) 
 
 (15) 
 (15)
End of year - 2014161
 
 30
 
 1
 192
 
 192
Revisions of previous estimates(31) 
 2
 
 (1) (30) 
 (30)
Purchases of reserves in place
 
 
 
 
 
 
Extensions, discoveries and        

 

   

             
other additions57
 
 
 
 
 57
 
 57
33
 
 
 
 33
 
 33
Production(14) 
 (4) 
 
 (18) 
 (18)(14) (4) 
 
 (18) 
 (18)
Sales of reserves in place(1) 
 
 
 
 (1) 
 (1)(1) 
 
 
 (1) 
 (1)
End of year - 2015172
 
 28
 
 
 200
 
 200
172
 28
 
 
 200
 
 200
Revisions of previous estimates(8) 
 
 
 (8) 
 (8)
Improved recovery
 
 
 
 
 
 
Purchases of reserves in place12
 
 
 
 12
 
 12
Extensions, discoveries and             
other additions11
 
 
 
 11
 
 11
Production(14) (4) 
 
 (18) 
 (18)
Sales of reserves in place(3) 
 
 
 (3) 
 (3)
End of year - 2016170
 24
 
 
 194
 
 194
Revisions of previous estimates37
 3
 
 
 40
 
 40
Improved recovery
 
 
 
 
 
 
Purchases of reserves in place5
 
 
 
 5
 
 5
Extensions, discoveries and             
other additions34
 2
 
 
 36
 
 36
Production(16) (4) 
 
 (20) 
 (20)
Sales of reserves in place(1) 
 
 
 (1) 
 (1)
End of year - 2017229
 25
 
 
 254
 
 254
Proved developed reserves:                            
Beginning of year - 201329
 
 23
 
 1
 53
 
 53
End of year - 201351
 
 18
 
 1
 70
 
 70
End of year - 201468
 
 15
 
 
 83
 
 83
Beginning of year - 201568
 15
 
 
 83
 
 83
End of year - 201592
 
 12
 
 
 104
 
 104
92
 12
 
 
 104
 
 104
End of year - 201678
 24
 
 
 102
 
 102
End of year - 2017118
 25
 
 
 143
 
 143
Proved undeveloped reserves:                            
Beginning of year - 201359
 
 15
 
 
 74
 
 74
End of year - 201368
 
 16
 
 
 84
 
 84
End of year - 201493
 
 15
 
 1
 109
 
 109
Beginning of year - 201593
 15
 
 1
 109
 
 109
End of year - 201580
 
 16
 
 
 96
 
 96
80
 16
 
 
 96
 
 96
End of year - 201692
 
 
 
 92
 
 92
End of year - 2017111
 
 
 
 111
 
 111




108











Supplementary Information on Oil and Gas Producing Activities (Unaudited)


Estimated Quantities of Proved Oil and Gas Reserves (continued)
(bcf)U.S. Canada 
E.G.(a)
 
Other
Africa
 Other Int'l Cont Ops Disc Ops TotalU.S. 
E.G.(a)
 Libya Other Int'l Cont Ops Disc Ops Total
Natural gas                            
Proved developed and undeveloped reserves:
Beginning of year - 20131,043
 
 1,424
 209
 14
 2,690
 89
 2,779
Beginning of year - 20151,144
 1,205
 209
 22
 2,580
 
 2,580
Revisions of previous estimates(4) 
 45
 4
 23
 68
 20
 88
(22) 35
 (3) 1
 11
 
 11
Purchases of reserves in place13
 
 3
 
 
 16
 
 16
Extensions, discoveries and        

 

   

other additions163
 
 9
 
 
 172
 3
 175
Production(b)
(114) 
 (161) (8) (9) (292) (19) (311)
Sales of reserves in place(76) 
 
 
 
 (76) 
 (76)
End of year - 20131,025
 
 1,320
 205
 28
 2,578
 93
 2,671
Revisions of previous estimates(24) 
 1
 5
 2
 (16) 7
 (9)
Purchases of reserves in place5
 
 
 
 
 5
 
 5
Extensions, discoveries and        

 

   

other additions290
 
 44
 
 
 334
 2
 336
Production(b)
(113) 
 (160) (1) (8) (282) (13) (295)
Sales of reserves in place(39) 
 
 
 
 (39) (89) (128)
End of year - 20141,144
 
 1,205
 209
 22
 2,580
 
 2,580
Revisions of previous estimates(191) 
 35
 (3) 1
 (158) 
 (158)
Improved recovery
 
 
 
 
 
 
Purchases of reserves in place1
 
 
 
 
 1
 
 1
1
 
 
 
 1
 
 1
Extensions, discoveries and        

 

   

             
other additions394
 
 
 
 
 394
 
 394
225
 
 
 
 225
 
 225
Production(b)
(128) 
 (150) 
 (8) (286) 
 (286)(128) (150) 
 (8) (286) 
 (286)
Sales of reserves in place(69) 
 
 
 
 (69) 
 (69)(69) 
 
 
 (69) 
 (69)
End of year - 20151,151
 
 1,090
 206
 15
 2,462
 
 2,462
1,151
 1,090
 206
 15
 2,462
 
 2,462
Revisions of previous estimates145
 8
 (1) 3
 155
 
 155
Improved recovery
 
 
 
 
 
 
Purchases of reserves in place61
 
 
 
 61
 
 61
Extensions, discoveries and             
other additions71
 
 
 
 71
 
 71
Production (b)
(115) (155) 
 (8) (278) 
 (278)
Sales of reserves in place(25) 
 
 
 (25) 
 (25)
End of year - 20161,288
 943
 205
 10
 2,446
 
 2,446
Revisions of previous estimates(33) (18) 
 4
 (47) 
 (47)
Improved recovery
 
 
 
 
 
 
Purchases of reserves in place36
 
 
 
 36
 
 36
Extensions, discoveries and             
other additions204
 76
 
 
 280
 
 280
Production (b)
(127) (168) (1) (6) (302) 
 (302)
Sales of reserves in place(44) 
 
 
 (44) 
 (44)
End of year - 20171,324
 833
 204
 8
 2,369
 
 2,369
Proved developed reserves:              
             
Beginning of year - 2013546
 
 980
 99
 8
 1,633
 20
 1,653
End of year - 2013540
 
 823
 95
 21
 1,479
 20
 1,499
End of year - 2014575
 
 664
 94
 17
 1,350
 
 1,350
Beginning of year - 2015575
 664
 94
 17
 1,350
 
 1,350
End of year - 2015640
 
 552
 94
 11
 1,297
 
 1,297
640
 552
 94
 11
 1,297
 
 1,297
End of year - 2016648
 943
 95
 5
 1,691
 
 1,691
End of year - 2017726
 833
 94
 2
 1,655
 
 1,655
Proved undeveloped reserves:              
             
Beginning of year - 2013497
 
 444
 110
 6
 1,057
 69
 1,126
End of year - 2013485
 
 497
 110
 7
 1,099
 73
 1,172
End of year - 2014569
 
 541
 115
 5
 1,230
 
 1,230
Beginning of year - 2015569
 541
 115
 5
 1,230
 
 1,230
End of year - 2015511
 
 538
 112
 4
 1,165
 
 1,165
511
 538
 112
 4
 1,165
 
 1,165
End of year - 2016640
 
 110
 5
 755
 
 755
End of year - 2017598
 
 110
 6
 714
 
 714






109








Supplementary Information on Oil and Gas Producing Activities (Unaudited)


Estimated Quantities of Proved Oil and Gas Reserves (continued)
(mmbbl)U.S. Canada 
E.G.(a)
 
Other
Africa
 Other Int'l Cont Ops Disc Ops TotalU.S. 
E.G.(a)
 Libya Other Int'l Cont Ops Disc Ops Total
Synthetic crude oil                            
Proved developed and undeveloped reserves:
Beginning of year - 2013
 653
 
 
 
 653
 
 653
Beginning of year - 2015
 
 
 
 
 648
 648
Revisions of previous estimates
 36
 
 
 
 36
 
 36

 
 
 
 
 67
 67
Improved recovery
 
 
 
 
 
 
Purchases of reserves in place
 
 
 
 
 
 
Extensions, discoveries and                            
other additions
 6
 
 
 
 6
 
 6

 
 
 
 
 
 
Production
 (15) 
 
 
 (15) 
 (15)
 
 
 
 
 (17) (17)
End of year - 2013
 680
 
 
 
 680
 
 680
Sales of reserves in place
 
 
 
 
 
 
End of year - 2015
 
 
 
 
 698
 698
Revisions of previous estimates
 (55) 
 
 
 (55) 
 (55)
 
 
 
 
 12
 12
Improved recovery
 
 
 
 
 
 
Purchases of reserves in place
 38
 
 
 
 38
 
 38

 
 
 
 
 
 
Extensions, discoveries and             
other additions
 
 
 
 
 
 
Production
 (15) 
 
 
 (15) 
 (15)
 
 
 
 
 (18) (18)
End of year - 2014
 648
 
 
 
 648
 
 648
Sales of reserves in place
 
 
 
 
 
 
End of year - 2016
 
 
 
 
 692
 692
Revisions of previous estimates
 67
 
 
 
 67
 
 67

 
 
 
 
 
 
Improved recovery
 
 
 
 
 
 
Purchases of reserves in place
 
 
 
 
 
 
Extensions, discoveries and             
other additions
 
 
 
 
 
 
Production
 (17) 
 
 
 (17) 
 (17)
 
 
 
 
 (7) (7)
Sales of reserves in place
 
 
 
 
 (685) (685)
End of year - 2017
 
 
 
 
 
 
Proved developed reserves:             
Beginning of year - 2015
 
 
 
 
 644
 644
End of year - 2015
 698
 
 
 
 698
 
 698

 
 
 
 
 698
 698
Proved developed reserves:               
Beginning of year - 2013
 653
 
 
 
 653
 
 653
End of year - 2013
 674
 
 
 
 674
 
 674
End of year - 2014
 644
 
 
 
 644
 
 644
End of year - 2016
 
 
 
 
 692
 692
End of year - 2017
 
 
 
 
 
 
Proved undeveloped reserves:             
Beginning of year - 2015
 
 
 
 
 4
 4
End of year - 2015
 698
 
 
 
 698
 
 698

 
 
 
 
 
 
Proved undeveloped reserves:               
End of year - 2013
 6
 
 
 
 6
 
 6
End of year - 2014
 4
 
 
 
 4
 
 4
End of year - 2016
 
 
 
 
 
 
End of year - 2017
 
 
 
 
 
 



110













Supplementary Information on Oil and Gas Producing Activities (Unaudited)


Estimated Quantities of Proved Oil and Gas Reserves (continued)
(mmboe)U.S. Canada 
E.G.(a)
 
Other
Africa
 Other Int'l Cont Ops Disc Ops TotalU.S. 
E.G.(a)
 Libya Other Int'l Cont Ops Disc Ops Total
Total Proved Reserves                            
Proved developed and undeveloped reserves:
Beginning of year - 2013649
 653
 347
 244
 27
 1,920
 97
 2,017
Revisions of previous estimates45
 36
 7
 12
 11
 111
 21
 132
Improved recovery
 
 
 
 
 
 11
 11
Purchases of reserves in place16
 
 1
 
 
 17
 
 17
Extensions, discoveries and        

 

   

other additions164
 6
 2
 3
 
 175
 9
 184
Production(b)
(74) (15) (39) (10) (7) (145) (32) (177)
Sales of reserves in place(13) 
 
 
   (13) 
 (13)
End of year - 2013787
 680
 318
 249
 31
 2,065
 106
 2,171
Revisions of previous estimates36
 (55) 
 (3) 
 (22) 11
 (11)
Improved recovery2
 
 
 
 
 2
 
 2
Purchases of reserves in place8
 38
 
 
 
 46
 
 46
Extensions, discoveries and        

 

   
other additions250
 
 8
 
 7
 265
 3
 268
Production(b)
(87) (15) (38) (3) (5) (148) (19) (167)
Sales of reserves in place(10) 
 
 
 
 (10) (101) (111)
End of year - 2014986
 648
 288
 243
 33
 2,198
 
 2,198
Beginning of year - 2015986
 288
 243
 33
 1,550
 648
 2,198
Revisions of previous estimates(173) 67
 8
 (8) (2) (108) 
 (108)(67) 8
 (8) (2) (69) 67
 (2)
Improved recovery1
 
 
 
 
 1
 
 1
1
 
 
 
 1
 
 1
Purchases of reserves in place1
 
 
 
 
 1
 
 1
1
 
 
 
 1
 
 1
Extensions, discoveries and        

 

   

             
other additions245
 
 1
 
 
 246
 
 246
139
 1
 
 
 140
 
 140
Production(b)
(98) (17) (36) 
 (6) (157) 
 (157)(98) (36) 
 (6) (140) (17) (157)
Sales of reserves in place(18) 
 
 
 
 (18) 
 (18)(18) 
 
 
 (18) 
 (18)
End of year - 2015944
 698

261

235

25
 2,163
 

2,163
944
 261
 235
 25
 1,465
 698
 2,163
Revisions of previous estimates73
 2
 (28) 4
 51
 12
 63
Improved recovery4
 
 
 
 4
 
 4
Purchases of reserves in place34
 
 
 
 34
 
 34
Extensions, discoveries and             
other additions59
 
 
 1
 60
 
 60
Production (b)
(82) (37) (1) (6) (126) (18) (144)
Sales of reserves in place(84) 
 
 
 (84) 
 (84)
End of year - 2016948
 226
 206
 24
 1,404
 692
 2,096
Revisions of previous estimates42
 (1) 
 8
 49
 
 49
Improved recovery
 
 
 
 
 
 
Purchases of reserves in place28
 
 
 
 28
 
 28
Extensions, discoveries and             
other additions98
 18
 
 
 116
 
 116
Production (b)
(86) (40) (7) (5) (138) (7) (145)
Sales of reserves in place(10) 
 
 
 (10) (685) (695)
End of year - 20171,020
 203
 199
 27
 1,449
 
 1,449
Proved developed reserves:                            
Beginning of year - 2013289
 653
 231
 185
 22
 1,380
 66
 1,446
End of year - 2013382
 674
 193
 192
 23
 1,464
 80
 1,544
End of year - 2014458
 644
 155
 191
 22
 1,470
 
 1,470
Beginning of year - 2015458
 155
 191
 22
 826
 644
 1,470
End of year - 2015526
 698
 129
 189
 18
 1,560
 
 1,560
526
 129
 189
 18
 862
 698
 1,560
End of year - 2016424
 226
 188
 14
 852
 692
 1,544
End of year - 2017502
 203
 181
 17
 903
 
 903
Proved undeveloped reserves:              
             
Beginning of year - 2013360
 
 116
 59
 5
 540
 31
 571
End of year - 2013405
 6
 125
 57
 8
 601
 26
 627
End of year - 2014528
 4
 133
 52
 11
 728
 
 728
Beginning of year - 2015528
 133
 52
 11
 724
 4
 728
End of year - 2015418
 
 132
 46
 7
 603
 
 603
418
 132
 46
 7
 603
 
 603
End of year - 2016524
 
 18
 10
 552
 
 552
End of year - 2017518
 
 18
 10
 546
 
 546

(a) 
Consists of estimated reserves from properties governed by production sharing contracts.
(b) 
Excludes the resale of purchased natural gas used in reservoir management.
2015

Total
Supplementary Information on Oil and Gas Producing Activities (Unaudited)


2017 proved reserves declineddecreased 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.

2015 proved reserves decreased by 35 mmboe primarily due to negative revisionsthe following:
Revisions of previous estimates: Decreased by 2 mmboe primarily resulting from an increase of 105 mmboe associated with drilling programs in the U.S. totalingresource plays and an increase of 67 mmboe in discontinued operations due to technical reevaluation and lower royalty percentages related to lower realized prices, offset by a decrease of 173 mmboe which was largely a result ofdue to reductions to our capital development program and adherence to the SEC 5-year rulerule.
Extensions, discoveries, and other additions: Increased by140 mmboe as well as routine production. This decline was partially offset by increased reserves from thea result of drilling programs in our U.S. unconventional shale plays totaling 245resource plays.
Production: Decreased by 157 mmboe.
Sales of reserves in place: U.S. conventional assets sales contributed to a decrease of 18 mmboe.

Changes in Proved Undeveloped Reserves
As of December 31, 2017, 546 mmboe as well asof proved undeveloped reserves were reported, a positive revisiondecrease of 676 mmboe from December 31, 2016. The following table shows changes in proved undeveloped reserves for 2017:
(mmboe)
Beginning of year552
Revisions of previous estimates5
Improved recovery
Purchases of reserves in place15
Extensions, discoveries, and other additions57
Dispositions
Transfers to proved developed(83)
End of year546
Revisions of prior estimates. Revisions of prior estimates increased 5 mmboe during 2017, primarily due to a 44 mmboe increase in the Bakken from an acceleration of higher economic wells into the 5-year plan, offset by a decrease of 40 mmboe in OSM. The OSM revision was a consequenceOklahoma due to the removal of technical reevaluationless economic wells from the 5-year plan.
Extensions, discoveries and lower royalty percentages from lower realized prices. Royalties paidother additions. Increased 57 mmboe through expansion of proved areas in Canada are on a sliding scale; as the sales price of our synthetic crude oil increases, our royalty rate increases.Oklahoma.

111



Supplementary Information on Oil and Gas Producing Activities (Unaudited)


2014
U.S.Transfers to proved developed. 83 mmboe of PUD reserves increases in 2014were converted to proved developed status during 2017, primarily from extensions, discoveries and additions of 250 mmboe were the result of development activityassets in our U.S. resource plays. This 2017 transfer equates to a 15% PUD conversion rate and a 5-year average annual PUD conversion rate during the 2013-2017 period of 18%. All proved undeveloped reserve drilling locations are scheduled to be drilled prior to the end of 2022.
A total of 25 mmboe of proved undeveloped reserves, or less than 2% of the company’s total proved reserves, have been on the books beyond 5 years as of year-end 2017.
As of year-end 2017, there were 18 mmboe of proved undeveloped reserves, initially disclosed in 2012, associated with the Faregh Phase II project in Libya. Drilling operations and construction of the associated gas plant were completed in 2010. Final commissioning was halted in 2011 and again in 2013 due to civil unrest and subsequent declaration of Force Majeure.  In 2017, teams conducted an assessment of the facilities to determine the state of the equipment and developed a plan to recommission the plant and initiate production in 2018, at which time, all associated proved undeveloped reserves will be transferred to proved developed.
As of year-end 2017, there were 7 mmboe of proved undeveloped reserves, initially disclosed in 2011, associated with the Fuel Gas Deficiency project in the U.K. The salesproject includes the design, procurement and installation of the Brae Bravo gas by-pass, which will ensure continued operations at the existing Brae Alpha and East Brae platforms. The project has been approved and work is underway with completion expected in 2018, at which time, all associated proved undeveloped reserves will be transferred to proved developed.
Costs Incurred & Future Costs to Develop
Costs incurred in place related2017, 2016 and 2015 relating to our Norwaythe development of proved undeveloped reserves were $842 million, $359 million and Angola discontinued operations were$1,415 million. As of December 31, 2017, future development costs estimated to be required for the largest decreases in 2014development of proved reserves. The negative 55 mmboe revision to Canadian syntheticundeveloped crude oil and condensate, NGLs and natural gas reserves primarily reflectsfor the impact of technicalyears 2018 through 2022 are projected to be $1,425 million, $1,348 million, $1,409 million, $1,458 million and price changes on calculated royalty volumes as well as development plan changes in the mineable areas.
2013
U.S. proved reserves increases in 2013 from extensions, discoveries and additions of 164 mmboe and revisions of previous estimates of 45 mmboe were the result of drilling programs in our shale plays. Revisions of previous estimates increased 36 mmboe in Canada primarily due to price and cost changes.$1,028 million.


Capitalized Costs and Accumulated Depreciation, Depletion and Amortization
112

 Year Ended December 31,
(In millions)U.S. E.G. Libya Other Africa Other Int'l Total
2017 Capitalized Costs:           
Proved properties$27,477
 $1,990
 830
 $
 $5,050
 $35,347
Unproved properties2,755
 110
 217
 43
 33
 3,158
Total30,232
 2,100
 1,047
 43
 5,083
 38,505
Accumulated depreciation,          
depletion and amortization:          
Proved properties14,254
 1,348
 289
 
 4,850
 20,741
Unproved properties (a)
206
 
 
 43
 33
 282
Total14,460
 1,348
 289
 43
 4,883
 21,023
Net capitalized costs$15,772
 $752
 $758
 $
 $200
 $17,482
2016 Capitalized Costs:          
Proved properties$25,497
 $1,978
 $756
 $
 $5,864
 $34,095
Unproved properties1,473
 119
 281
 136
 183
 2,192
Total26,970
 2,097
 1,037
 136
 6,047
 36,287
Accumulated depreciation,          
depletion and amortization:          
Proved properties12,526
 1,216
 268
 1
 5,246
 19,257
Unproved properties (a)
382
 2
 
 
 113
 497
Total12,908
 1,218
 268
 1
 5,359
 19,754
Net capitalized costs$14,062
 $879
 $769
 $135
 $688
 $16,533
(a) Includes unproved property impairments (see Note 10).


Supplementary Information on Oil and Gas Producing Activities (Unaudited)


Capitalized Costs and Accumulated Depreciation, Depletion and Amortization
 Year Ended December 31,
(In millions)U.S. Canada E.G. 
Other
Africa
 Other Int'l Total
2015 Capitalized Costs:           
Proved properties$27,816
 $9,538
 $1,955
 $828
 $5,741
 $45,878
Unproved properties1,625
 1,389
 86
 465
 242
 3,807
Total29,441
 10,927
 2,041
 1,293
 5,983
 49,685
Accumulated depreciation,           
depletion and amortization:           
Proved properties13,656
 1,420
 1,105
 263
 5,195
 21,639
Unproved properties (a)
675
 310
 
 107
 114
 1,206
Total14,331
 1,730
 1,105
 370
 5,309
 22,845
Net capitalized costs$15,110
 $9,197
 $936
 $923
 $674
 $26,840
2014 Capitalized Costs:           
Proved properties$28,334
 $9,481
 $1,804
 $823
 $5,707
 $46,149
Unproved properties1,861
 1,505
 64
 460
 237
 4,127
Total30,195
 10,986
 1,868
 1,283
 5,944
 50,276
Accumulated depreciation,           
depletion and amortization:           
Proved properties13,746
 1,183
 1,010
 260
 5,075
 21,274
Unproved properties189
 1
 
 
 9
 199
Total13,935
 1,184
 1,010
 260
 5,084
 21,473
Net capitalized costs$16,260
 $9,802
 $858
 $1,023
 $860
 $28,803
(a)    Includes unproved property impairments (see Note 13).
Costs Incurred for Property Acquisition, Exploration and Development(a) 
(In millions)U.S. Canada E.G. 
Other
Africa
 Other Int'l Cont Ops Disc Ops TotalU.S. E.G. Libya 
Other
Africa
 Other Int'l Cont Ops Disc Ops Total
December 31, 2017               
Property acquisition:               
Proved$191
 $1
 $
 $
 $
 $192
 $
 $192
Unproved1,746
 
 
 1
 
 1,747
 
 1,747
Exploration882
 1
 
 37
 3
 923
 
 923
Development1,122
 5
 10
 
 (144)
(b) 
993
 6
 999
Total$3,941
 $7
 $10
 $38
 $(141) $3,855
 $6
 $3,861
December 31, 2016               
Property acquisition:               
Proved$276
 $
 $
 $
 $
 $276
 $
 $276
Unproved642
 
 
 1
 (11) 632
 
 632
Exploration525
 1
 
 10
 3
 539
 
 539
Development456
 55
 3
 
 121
(b) 
635
 31
 666
Total$1,899
 $56
 $3
 $11
 $113
 $2,082
 $31
 $2,113
December 31, 2015                              
Property acquisition:                              
Proved$4
 $
 $
 $
 $
 $4
 $
 $4
$4
 $
 $
 $
 $
 $4
 $
 $4
Unproved61
 
 
 1
 
 62
 
 62
61
 
 
 1
 
 62
 
 62
Exploration959
 1
 60
 38
 50
 1,108
 
 1,108
959
 60
 1
 37
 50
 1,107
 1
 1,108
Development1,477
 
 150
 13
 31
(c) 
1,671
 
 1,671
1,477
 150
 13
 
 31
 1,671
 
 1,671
Total$2,501
 $1
(b) 
$210
 $52
 $81
 $2,845
 $
 $2,845
$2,501
 $210
 $14
 $38
 $81
 $2,844
 $1
 $2,845
December 31, 2014               
Property acquisition:               
Proved$26
 $
 $
 $
 $
 $26
 $
 $26
Unproved202
 3
 
 53
 2
 260
 1
 261
Exploration1,140
 4
 35
 119
 119
 1,417
 6
 1,423
Development3,532
 196
 139
 16
 94
 3,977
 418
 4,395
Total$4,900
 $203
 $174
 $188
 $215
 $5,680
 $425
 $6,105
December 31, 2013               
Property acquisition:               
Proved$51
 $30
 $9
 $
 $
 $90
 $
 $90
Unproved157
 
 
 44
 21
 222
 
 222
Exploration885
 9
 4
 124
 151
 1,173
 98
 1,271
Development2,876
 280
 84
 46
 83
 3,369
 499
 3,868
Total$3,969
 $319
 $97
 $214
 $255
 $4,854
 $597
 $5,451
(a) 
Includes costs incurred whether capitalized or expensed. 
(b) 
Reflects reimbursements earned from the governments of Canada and Alberta related to funds previously expended for Quest CCS capital equipment.
(c)
Includes negative revisions to asset retirement costs primarily due to lowerchanges in U.K. estimated costs for future abandonments as well as changes in timing of theseabandonment activities in the U.K.

113



Supplementary Information on Oil and Gas Producing Activities (Unaudited)


Results of Operations for Oil and Gas Producing Activities
 U.S. Canada E.G. 
Other
Africa
 Other Int'l Cont Ops Disc Ops Total
Year Ended December 31, 2015               
Revenues and other income:               
Sales$3,374
 $700
 $40
 $
 $329
 $4,443
 $
 $4,443
Transfers
 
  296
 
 
 296
 
 296
Other income(a)
230
 
  
 (109) 1
 122
 
 122
Total revenues and other income3,604
 700
 336
 (109) 330
 4,861
 
 4,861
Expenses:               
Production costs(1,259) (660) (84) (31) (177) (2,211) 
 (2,211)
Exploration expenses(b)
(750) (348) (41) (36) (143) (1,318) 
 (1,318)
Depreciation, depletion and        

      
amortization(c)
(2,758) (266) (92) (5) (163) (3,284) 
 (3,284)
Technical support and other(47) (2) (6) (2) (3) (60) 
 (60)
Total expenses(4,814) (1,276) (223) (74) (486) (6,873) 
 (6,873)
Results before income taxes(1,210) (576) 113
 (183) (156) (2,012) 
 (2,012)
Income tax provision437
 31
 (33) 87
 86
 608
 
 608
Results of operations$(773) $(545) $80
 $(96) $(70) $(1,404) $
 $(1,404)
Year Ended December 31, 2014               
Revenues and other income:               
Sales$5,754
 $1,316
 $43
 $244
 $440
 $7,797
 $189
 $7,986
Transfers3
 
  588
 
 3
 594
 1,848
 2,442
Other income(a)
(85) 
  
 
 
 (85) 1,832
 1,747
Total revenues and other income5,672
 1,316
 631
 244
 443
 8,306
 3,869
 12,175
Expenses:              
Production costs(1,544) (803) (154) (79) (253) (2,833) (181) (3,014)
Exploration expenses(607) (1) (26) (103) (56) (793) (5) (798)
Depreciation, depletion and        

 

    
amortization(c)
(2,474) (206) (93) (9) (115) (2,897) (105) (3,002)
Technical support and other(193) (15) (31) (21) (14) (274) (7) (281)
Total expenses(4,818) (1,025) (304) (212) (438) (6,797) (298) (7,095)
Results before income taxes854
 291
 327
 32
 5
 1,509
 3,571
 5,080
Income tax provision(302) (71) (117) (32) (18) (540) (1,496) (2,036)
Results of operations$552
 $220
 $210
 $
 $(13) $969
 $2,075
 $3,044
Year Ended December 31, 2013               
Revenues and other income:               
Sales$5,059
 $1,376
 $33
 $1,106
 $687
 $8,261
 $599
 $8,860
Transfers3
 
  715
 
 6
 724
 2,935
 3,659
Other income(a)
(9) 
  
 
 (8) (17) 
 (17)
Total revenues and other income5,053
 1,376
 748
 1,106
 685
 8,968
 3,534
 12,502
Expenses:              
Production costs(1,318) (867) (113) (73) (271) (2,642) (273) (2,915)
Exploration expenses(717) (8) (3) (65) (98) (891) (107) (998)
Depreciation, depletion and        

 

   
amortization(c)
(1,980) (218) (97) (28) (151) (2,474) (345) (2,819)
Technical support and other(185) (21) (30) (19) (15) (270) (38) (308)
Total expenses(4,200) (1,114) (243) (185) (535) (6,277) (763) (7,040)
Results before income taxes853
 262
 505
 921
 150
 2,691
 2,771
 5,462
Income tax provision(323) (66) (182) (920) (117) (1,608) (1,948) (3,556)
Results of operations$530
 $196
 $323
 $1
 $33
 $1,083
 $823
 $1,906
(a)
Includes net gain (loss) on dispositions (see Note 5).
(b)
Includes unproved property impairments (see Note 13).
(c)
Includes long-lived asset impairments (see Note 13).
(d)    Includes $135 million of deferred tax expense related to Alberta provincial corporate tax rate increase (see Note 9).

114



Supplementary Information on Oil and Gas Producing Activities (Unaudited)


Results of Operations for Oil and Gas Producing Activities
 U.S. E.G. Libya 
Other
Africa
 Other Int'l Cont Ops Disc Ops Total
Year Ended December 31, 2017               
Revenues and other income:               
Sales$3,050
 $45
 $431
 $
 $282
 $3,808
 $423
 $4,231
Transfers
 344
 
 
 
 344
 
 344
Other income(a)
74
 
 
 
 38
 112
 (43) 69
Total revenues and other income3,124
 389
 431
 
 320
 4,264
 380
 4,644
Expenses:          
    
Production costs(985) (84) (44) 
 (152) (1,265) (272) (1,537)
Exploration expenses(b)
(153) 
 
 (171) (83) (407) 
 (407)
Depreciation, depletion and        

 

    
amortization(c)
(2,105) (134) (21) 
 (273) (2,533) (6,676) (9,209)
Technical support and other(28) (4) (4) (7) (18) (61) 
 (61)
Total expenses(3,271) (222) (69) (178) (526) (4,266) (6,948) (11,214)
Results before income taxes(147) 167
 362
 (178) (206) (2) (6,568) (6,570)
Income tax provision(1) (50) (333) 
 13
 (371) 1,674
 1,303
Results of operations$(148) $117
 $29
 $(178) $(193) $(373) $(4,894) $(5,267)
Year Ended December 31, 2016          
    
Revenues and other income:          
    
Sales$2,249
 $42
 $54
 $
 $237
 $2,582
 $724
 $3,306
Transfers
 291
 
 
 
 291
 
 291
Other income(a)
387
 
 
 
 2
 389
 
 389
Total revenues and other income2,636
 333
 54
 
 239
 3,262
 724
 3,986
Expenses:          
   
Production costs(952) (81) (36) 
 (140) (1,209) (544) (1,753)
Exploration expenses(b)
(306) (1) (6) (8) (2) (323) (7) (330)
Depreciation, depletion and        

 

    
amortization(c)
(1,901) (114) (7) 
 (132) (2,154) (239) (2,393)
Technical support and other(21) (4) 
 (3) (2) (30) (1) (31)
Total expenses(3,180) (200) (49) (11) (276) (3,716) (791) (4,507)
Results before income taxes(544) 133
 5
 (11) (37) (454) (67) (521)
Income tax provision (d)
195
 (26) (2) 
 57
 224
 15
 239
Results of operations$(349) $107
 $3
 $(11) $20
 $(230) $(52) $(282)
Year Ended December 31, 2015          
    
Revenues and other income:          
    
Sales$3,374
 $40
 $
 $
 $329
 $3,743
 $700
 $4,443
Transfers
 296
 
 
 
 296
 
 296
Other income(a)
230
 
 
 (109) 1
 122
 
 122
Total revenues and other income3,604
 336
 
 (109) 330
 4,161
 700
 4,861
Expenses:          
   
Production costs(1,259) (84) (31) 
 (177) (1,551) (660) (2,211)
Exploration expenses(b)
(750) (41) 
 (36) (143) (970) (348) (1,318)
Depreciation, depletion and        

 

   

amortization(c)
(2,758) (92) (5) 
 (163) (3,018) (266) (3,284)
Technical support and other(47) (6) (1) (1) (3) (58) (2) (60)
Total expenses(4,814) (223) (37) (37) (486) (5,597) (1,276) (6,873)
Results before income taxes(1,210) 113
 (37) (146) (156) (1,436) (576) (2,012)
Income tax provision437
 (33) 37
 50
 86
 577
 31
 608
Results of operations$(773) $80
 $
 $(96) $(70) $(859) $(545) $(1,404)


Supplementary Information on Oil and Gas Producing Activities (Unaudited)


(a)
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.
(b)
Includes exploratory dry well costs, unproved property impairments, and other (see Note 10).
(c)
Includes long-lived asset impairments (see Note 10).
(d)    Discontinued operations activity includes $135 million of deferred tax expense related to Alberta provincial corporate tax rate increase.
Results of Operations for Oil and Gas Producing Activities
The following reconciles results of operations for oil and gas producing activities to segment income:
Year Ended December 31,Year Ended December 31,
(In millions)2015 2014 20132017 2016 2015
Results of operations$(1,404) $3,044
 $1,906
$(5,267) $(282) $(1,404)
Discontinued operations
 (2,075) (823)4,894
 52
 545
Results of continuing operations(1,404) 969
 1,083
(373) (230) (859)
Items not included in results of oil and gas operations, net of tax:          
Marketing income and other non-oil and gas producing related activities(75) 73
 40
(107) (39) (102)
Income from equity method investments127
 327
 340
229
 142
 127
Items not allocated to segment income, net of tax:          
Loss (gain) on asset dispositions(57) 58
 20
Loss (gain) on asset dispositions and other income(79) (248) (76)
Long-lived asset impairments819
 69
 10
475
 148
 602
Unrealized gain on derivatives(32) 
 
Alberta provincial corporate tax rate increase135
 
 
Unrealized loss (gain) on derivatives81
 72
 (32)
Deferred tax valuation allowance increase
 (32) 
Segment income$(487) $1,496
 $1,493
$226
 $(187) $(340)

115



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.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 and synthetic crude oil reserves.
(In millions)U.S. Canada E.G. 
Other
Africa
 Other Int'l TotalU.S. E.G. Libya Other Int'l Total
Year Ended December 31, 2017         
Future cash inflows$36,480
 $1,966
 $10,303
 $1,403
 $50,152
Future production and support costs(14,796) (748) (931) (821) (17,296)
Future development costs(6,987) (7) (501) (1,247) (8,742)
Future income tax expenses(786) (274) (8,387) 496
 (8,951)
Future net cash flows$13,911
 $937
 $484
 $(169)
(a) 
$15,163
10% annual discount for timing of cash flows(7,009) (235) (224) 168
 (7,300)
Standardized measure of discounted future net cash flows-
related to continuing operations
$6,902
 $702
 $260
 $(1) $7,863
Standardized measure of discounted future net cash flows-
related to discontinued operations
      

 
Year Ended December 31, 2016         
Future cash inflows$27,610
 $1,977
 $8,511
 $921
 $39,019
Future production and support costs(12,758) (824) (930) (673) (15,185)
Future development costs(7,233) (13) (296) (1,345) (8,887)
Future income tax expenses
 (251) (6,884) 514
 (6,621)
Future net cash flows$7,619
 $889
 $401
 $(583)
(a) 
$8,326
10% annual discount for timing of cash flows(4,355) (264) (143) 313
 (4,449)
Standardized measure of discounted future net cash flows-
related to continuing operations
$3,264
 $625
 $258
 $(270) $3,877
Standardized measure of discounted future net cash flows-
related to discontinued operations
      

 $1,076
Year Ended December 31, 2015                    
Future cash inflows$31,026
 $31,087
 $2,671
 $12,157
 $1,281
 $78,222
$31,026
 $2,671
 $12,157
 $1,281
 $47,135
Future production and support costs(12,270) (27,459) (1,095) (901) (902) (42,627)(12,270) (1,095) (901) (902) (15,168)
Future development costs(6,637) (2,929) (94) (689) (1,537) (11,886)(6,637) (94) (689) (1,537) (8,957)
Future income tax expenses(778) 
 (369) (9,857) 602
 (10,402)(778) (369) (9,857) 602
 (10,402)
Future net cash flows$11,341
 $699
 $1,113
 $710
 $(556)
(a) 
$13,307
$11,341
 $1,113
 $710
 $(556)
(a) 
$12,608
10% annual discount for timing of cash flows(6,082) (534) (380) (441) 352
 (7,085)(6,082) (380) (441) 352
 (6,551)
Standardized measure of discounted future net cash flows-
-related to continuing operations$5,259
 $165
 $733
 $269
 $(204) $6,222
-related to discontinued operations$
 $
 $
 $
 
 
Year Ended December 31, 2014           
Future cash inflows$66,307
 $55,675
 $5,027
 $23,803
 $3,040
 $153,852
Future production and support costs(19,504) (34,838) (1,270) (803) (1,452) (57,867)
Future development costs(14,626) (9,754) (259) (680) (1,669) (26,988)
Future income tax expenses(8,124) (2,190) (922) (21,008) (9) (32,253)
Future net cash flows$24,053
 $8,893
 $2,576
 $1,312
 $(90) $36,744
10% annual discount for timing of cash flows(12,138) (6,613) (915) (742) 221
 (20,187)
Standardized measure of discounted future net cash flows-
-related to continuing operations$11,915
 $2,280
 $1,661
 $570
 $131
 $16,557
-related to discontinued operations$
 $
 $
 $
 $
 $
Year Ended December 31, 2013           
Future cash inflows$54,099
 $59,585
 $5,911
 $28,195
 $3,178
 $150,968
Future production and support costs(16,774) (35,954) (1,619) (976) (1,191) (56,514)
Future development costs(9,685) (9,694) (367) (793) (1,302) (21,841)
Future income tax expenses(7,592) (3,098) (1,032) (24,982) (643) (37,347)
Future net cash flows$20,048
 $10,839
 $2,893
 $1,444
 $42
 $35,266
10% annual discount for timing of cash flows(9,940) (8,300) (1,084) (828) 128
 (20,024)
Standardized measure of discounted future net cash flows-
-related to continuing operations$10,108
 $2,539
 $1,809
 $616
 $170
 $15,242
-related to discontinued operations$
 $
 $
 $1,302
 $1,228
 $2,530
Standardized measure of discounted future net cash flows-
related to continuing operations
$5,259
 $733
 $269
 $(204) $6,057
Standardized measure of discounted future net cash flows-
related to discontinued operations
      

 $165
(a) 
Future cash flows for Other International reflects the impact of future abandonment costs related to the U.K.

116



Supplementary Information on Oil and Gas Producing Activities (Unaudited)


Changes in the Standardized Measure of Discounted Future Net Cash Flows
Year Ended December 31,Year Ended December 31, 
(In millions)2015 2014 20132017 2016 2015 
Sales and transfers of oil and gas produced, net of production and support costs$(2,460) $(5,284) $(6,080)$(2,853) $(1,634) $(2,422) 
Net changes in prices and production and support costs related to future production(25,239)
(b) 
(2,688) (336)4,916
 (3,621)
(b) 
(21,309)
(b) 
Extensions, discoveries and improved recovery, less related costs1,100
 3,539
 3,415
661
 (2,174) 6
 
Development costs incurred during the period1,694
 4,088
 3,429
1,027
 669
 1,693
 
Changes in estimated future development costs9,397
 (1,423) 898
183
 2,534
 7,247
 
Revisions of previous quantity estimates(a)
(7,625) (3,193) 1,330
497
 654
 (5,682) 
Net changes in purchases and sales of minerals in place(460) (168) (229)102
 (651) (460) 
Accretion of discount2,967
 3,132
 2,657
698
 1,005
 2,719
 
Net change in income taxes10,291
 3,312
 (1,930)(1,245) 1,038
 9,989
 
Net change for the year(10,335) 1,315
 3,154
3,986
 (2,180) (8,219) 
Beginning of the year related to continuing operations16,557
 15,242
 12,088
3,877
 6,057
 14,276
 
End of the year related to continuing operations$6,222
 $16,557
 $15,242
$7,863
 $3,877
 $6,057
 
Net change for the year related to discontinued operations$
 $(2,530) $399
$
 $911
 $(2,115) 
(a) 
Includes amounts resulting from changes in the timing of production.
(b)  
Decrease primarily due to lower realized prices.



117


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, 2015.2017.
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 2015,2017, 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.

118


PART III
Item 10. Directors, Executive Officers and Corporate Governance
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 20162018 Annual Meeting of Stockholders, to be filed with the SEC within 120 days of December 31, 20152017 (the "2016"2018 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 Business Conduct and the Code of Ethics for Senior Financial Officers, arewhich 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.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 20162018 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 20162018 Proxy Statement.
Securities Authorized for Issuance Under Equity Compensation Plans
The following table provides information as of December 31, 20152017 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.

Plan category
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)
 
Number of securities
remaining available for future issuance
under equity compensation plans
 
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)
 
Number of securities
remaining available for future issuance
under equity compensation plans
 
Equity compensation plans approved by stockholders13,715,861
(a) 
$29.97 30,434,538
(d) 
11,915,472
(a) 
$25.52 43,840,884
(d) 
Equity compensation plans not approved by stockholders12,291
(b) 
N/A 
  12,291
(b) 
N/A 
  
Total13,728,152
  N/A 30,434,538
  11,927,763
  N/A 43,840,884
  
(a) 
Includes the following:
3,513,104736,199 stock options outstanding under the 2016 Plan; 3,991,905 stock options outstanding under the 2012 Plan; 8,479,1405,591,708 stock options outstanding under the 2007 Plan; 673,175 stock options outstanding under the 2003 Plan;
294,800399,114 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; commonPlan. Common stock units credited under the 2016 Plan, 2012 Plan, 2007 Plan and 2003 Plan were 97,292, 163,51369,556, 142,724, 152,839 and 33,995, respectively;
755,642
1,196,546 restricted stock units granted to non-officers under the 2012 Plan and 20072016 Plan and outstanding as of December 31, 2015.2017.
In addition to the awards reported above, 3,261,7022,850,798 and 3,525,501 shares of restricted stock were issued and outstanding as of December 31, 2015,2017, but subject to forfeiture restrictions under the 2012 Plan.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 20122016 Plan. No more than 14,592,30018,496,714 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.

119


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 20162018 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 2016"2018" in the 20162018 Proxy Statement.

120


PART IV
Item 15. Exhibits, Financial Statement Schedules
A. Documents Filed as Part of the Report
1. Financial Statements – See Part II, Item 8. of this Annual Report on Form 10-K.
2. Financial Statement Schedules – FinancialThe audited 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.

121

Item 16. Form 10-K Summary
None.


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 25, 201622, 2018 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, John R. Sult,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 25, 201622, 2018 on behalf of the registrant and in the capacities indicated.
Signature Title
   
/S/ LEE M. TILLMAN
 President and Chief Executive Officer and Director
Lee M. Tillman  
   
/S/ JOHN R. SULTDane E. Whitehead
 Executive Vice President and Chief Financial Officer
John R. SultDane E. Whitehead  
   
/s/ GARY E. WILSON Vice President, Controller and Chief Accounting Officer
Gary E. Wilson  
   
/S/ DENNIS H. REILLEY
 Chairman of the Board
Dennis H. Reilley  
   
/s/ GAURDIE E. BANISTER, JR. Director
Gaurdie E. Banister, Jr.  
   
/S/ GREGORY H. BOYCE
 Director
Gregory H. Boyce  
   
/S/ PIERRE BRONDEAU
Director
Pierre Brondeau
/S/ CHADWICK C. DEATON Director
Chadwick C. Deaton  
   
/S/ MARCELA E. DONADIO
 Director
Marcela E. Donadio  
   
/S/ PHILIP LADER
 Director
Philip Lader  
   
/S/ MICHAEL E. J. PHELPS
 Director
Michael E. J. Phelps  

122


Exhibit Index
Exhibit  Incorporated by Reference (File No. 001-05153, unless otherwise indicated)
Number Exhibit DescriptionForm Exhibit Filing Date
3 Articles of Incorporation and By-laws
3.1 Restated Certificate of Incorporation of Marathon Oil Corporation10-Q 3.1 8/8/2013
3.2 Marathon Oil Corporation By-laws (Amended and restated as of September 1, 2015)8-K 3.1 8/28/2015
3.3 Specimen of Common Stock Certificate10-K 3.3 2/28/2014
4 Instruments Defining the Rights of Security Holders, Including Indentures
4.1 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 request10-K 4.2 2/28/2014
10 Material Contracts     
10.1 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 therein8-K 4.1 6/2/2014
10.2 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 therein10-Q 10.1 5/7/2015
10.3
 Marathon Oil Corporation 2012 Incentive Compensation PlanDEF 14A App. III 3/8/2012
10.4
 Form of Marathon Oil Corporation 2012 Incentive Compensation Plan Non-Qualified Stock Option Award Agreement8-K 10.1 8/1/2014
10.5
 Form of Performance Unit Award Agreement 2014 - 2016 Performance Cycle for Section 16 Officers10-Q 10.1 5/7/2014
10.6
 Form of Performance Unit Award Agreement 2014 - 2016 Performance Cycle for Officers10-Q 10.2 5/7/2014
10.7† Form of Initial CEO Option Grant Agreement granted under the Marathon Oil Corporation 2012 Incentive Compensation Plan10-Q 10.1 11/6/2013
10.8† Form of CEO Restricted Stock Agreement granted under the Marathon Oil Corporation 2012 Incentive Compensation Plan (3-year prorata vesting)10-Q 10.2 11/6/2013
10.9† Form of CEO Restricted Stock Award Agreement granted under the Marathon Oil Corporation 2012 Incentive Compensation Plan (3-year cliff vesting)10-Q 10.3 11/6/2013
10.10† Form of Performance Unit Award Agreement (2013-2015 Performance Cycle) for Section 16 Officers granted under the Marathon Oil Corporation 2012 Incentive Compensation Plan10-Q 10.1 5/10/2013
Exhibit   Incorporated by Reference (File No. 001-05153, unless otherwise indicated)
Number Exhibit Description Form Exhibit Filing Date
1 Underwriting Agreement      
1.1*       
2 Plan of Acquisition, Reorganization, Arrangement, Liquidation or Succession      
2.1  10-Q 10.1 5/5/2017
3 Articles of Incorporation and By-laws
3.1  10-Q 3.1 8/8/2013
3.2  8-K 3.1 3/1/2016
3.3  10-K 3.3 2/28/2014
4 Instruments Defining the Rights of Security Holders, Including Indentures
4.1  10-K 4.2 2/28/2014
10 Material Contracts      
10.1  8-K 4.1 6/2/2014
10.2  10-Q 10.1 5/7/2015
10.3  8-K 99.1 3/8/2016

1


ExhibitIncorporated by Reference (File No. 001-05153, unless otherwise indicated)
NumberExhibit DescriptionFormExhibitFiling Date
10.11†Form of Performance Unit Award Agreement (2013-2015 Performance Cycle) for Officers granted under the Marathon Oil Corporation 2012 Incentive Compensation Plan10-Q10.25/10/2013
10.12†Form of Nonqualified Stock Option Award Agreement for Section 16 Officers granted under the Marathon Oil Corporation 2012 Incentive Compensation Plan (3-year prorata vesting)10-K10.52/22/2013
10.13†Form of Nonqualified Stock Option Award Agreement for Officers granted under the Marathon Oil Corporation 2012 Incentive Compensation Plan (3-year prorata vesting)10-K10.62/22/2013
10.14†Form of Restricted Stock Award Agreement for Section 16 Officers granted under the Marathon Oil Corporation 2012 Incentive Compensation Plan (3-year cliff vesting)10-K10.72/22/2013
10.15†Form of Restricted Stock Award Agreement for Officers granted under the Marathon Oil Corporation 2012 Incentive Compensation Plan (3-year cliff vesting)10-K10.82/22/2013
10.16
Form of Restricted Stock Award Agreement for Section 16 Officers granted under the Marathon Oil Corporation 2012 Incentive Compensation Plan (3-year prorata vesting)10-K10.92/22/2013
10.17
Form of Restricted Stock Award Agreement for Officers granted under the Marathon Oil Corporation 2012 Incentive Compensation Plan (3-year prorata vesting)10-K10.102/22/2013
10.18
Form of Nonqualified Stock Option Award Agreement for non-officers granted under the Marathon Oil Corporation 2012 Incentive Compensation Plan (3-year prorata vesting)10-K10.112/22/2013
10.19
Form of Nonqualified Stock Option Award Agreement for non-officers in Canada granted under the Marathon Oil Corporation 2012 Incentive Compensation Plan (3-year prorata vesting)10-K10.122/22/2013
10.20
Form of Restricted Stock Award Agreement for non-officers granted under the Marathon Oil Corporation 2012 Incentive Compensation Plan (3-year prorata vesting)10-K10.132/22/2013
10.21
Form of Restricted Stock Unit Award Agreement for non-officers granted under the Marathon Oil Corporation 2012 Incentive Compensation Plan (3-year prorata vesting)10-K10.142/22/2013
10.22
Marathon Oil Corporation 2007 Incentive Compensation Plan10-K10.52/29/2012
10.23
Form of Nonqualified Stock Option Award Agreement for Officers granted under the Marathon Oil Corporation 2007 Incentive Compensation Plan10-K10.62/29/2012
10.24
Form of Nonqualified Stock Option Award Agreement for Officers granted under the Marathon Oil Corporation 2007 Incentive Compensation Plan10-K10.52/28/2011
10.25†Form of Nonqualified Stock Option Award Agreement granted under the Marathon Oil Corporation 2007 Incentive Compensation Plan10-K10.262/26/2010
10.26†Marathon Oil Corporation 2003 Incentive Compensation Plan, Effective January 1, 200310-K10.92/26/2010
Exhibit   Incorporated by Reference (File No. 001-05153, unless otherwise indicated)
Number Exhibit Description Form Exhibit Filing Date
10.4  8-K 99.1 6/23/2017
10.5  10-Q 10.2 8/3/2017
10.6
  DEF 14A App. A 4/7/2016
10.7†  8-K/A 10.1 10/6/2016
10.8†  10-K 10.6 2/24/2017
10.9†  10-K 10.7 2/24/2017
10.10†  10-K 10.8 2/24/2017
10.11†

  10-K 10.9 2/24/2017
10.12*       
10.13*       
10.14
  DEF 14A App. III 3/8/2012
10.15
  8-K 10.1 8/1/2014
10.16†  10-Q 10.1 5/7/2014
10.17
  10-Q 10.2 5/7/2014
10.18†  10-Q 10.1 11/6/2013


2


Exhibit  Incorporated by Reference (File No. 001-05153, unless otherwise indicated)
Number Exhibit DescriptionForm Exhibit Filing Date
10.27† Form of Nonqualified Stock Option Award Agreement for Officers granted under the Marathon Oil Corporation 2003 Incentive Compensation Plan10-K 10.22 2/26/2010
10.28† Marathon Oil Corporation Deferred Compensation Plan for Non-Employee Directors (Amended and Restated as of January 1, 2012)10-Q 10.3 5/7/2014
10.29† Marathon Oil Company Deferred Compensation Plan Amended and Restated Effective June 30, 201110-K 10.32 2/29/2012
10.30† Marathon Oil Company Excess Benefit Plan Amended and Restated10-K 10.31 2/29/2012
10.31† Marathon Oil Corporation 2011 Officer Change in Control Severance Benefits Plan (as amended, effective November 1, 2014)10-K 10.36 3/2/2015
10.32
 Marathon Oil Corporation Policy for Repayment of Annual Cash Bonus Amounts10-K 10.10 2/28/2011
10.33
 Marathon Oil Executive Tax, Estate, and Financial Planning Program, Amended and Restated, Effective January 1, 200910-K 10.32 2/27/2009
10.34
 Marathon Oil Corporation Bonus Agreement Upon Commencement of Employment for Lee M. Tillman10-Q 10.4 11/6/2013
10.35 Tax Sharing Agreement dated as of May 25, 2011 among Marathon Oil Corporation, Marathon Petroleum Corporation and MPC Investment LLC8-K 10.1 5/26/2011
12.1* Computation of Ratio of Earnings to Fixed Charges     
21.1* List of Significant Subsidiaries     
23.1* Consent of Independent Registered Public Accounting Firm     
23.2* Consent of GLJ Petroleum Consultants LTD., independent petroleum engineers and geologists     
23.3* Consent of Ryder Scott Company, L.P., independent petroleum engineers and geologists     
23.4* Consent of Netherland, Sewell & Associates, Inc., independent petroleum engineers and geologists     
31.1* Certification of President and Chief Executive Officer pursuant to Rule 13(a)-14 and 15(d)-14 under the Securities Exchange Act of 1934     
31.2* Certification of Executive Vice President and Chief Financial Officer pursuant to Rule 13(a)-14 and 15(d)-14 under the Securities Exchange Act of 1934     
32.1* Certification of President and Chief Executive Officer pursuant to 18 U.S.C. Section 1350     
32.2* Certification of Executive Vice President and Chief Financial Officer pursuant to 18 U.S.C. Section 1350     
99.1* Report of GLJ Petroleum Consultants LTD., independent petroleum engineers and geologists for 2015     
99.2 Report of GLJ Petroleum Consultants LTD., independent petroleum engineers and geologists for 201410-K 99.1 3/2/2015
99.3 Report of GLJ Petroleum Consultants LTD., independent petroleum engineers and geologists for 201310-K 99.1 2/28/2014
Exhibit   Incorporated by Reference (File No. 001-05153, unless otherwise indicated)
Number Exhibit Description Form Exhibit Filing Date
10.19†  10-K 10.5 2/22/2013
10.20†  10-K 10.6 2/22/2013
10.21†  10-K 10.7 2/22/2013
10.22†  10-K 10.8 2/22/2013
10.23
  10-K 10.9 2/22/2013
10.24
  10-K 10.10 2/22/2013
10.25
  10-K 10.5 2/29/2012
10.26†  10-K 10.6 2/29/2012
10.27
  10-K 10.5 2/28/2011
10.28†  10-K 10.26 2/26/2010
10.29†  10-K 10.9 2/26/2010
10.30†  10-K 10.29 2/24/2017
10.31†  10-K 10.32 2/29/2012
10.32†  10-K 10.31 2/29/2012
10.33†*       
10.34
  10-K 10.10 2/28/2011
10.35
  10-K 10.32 2/27/2009
10.36  8-K 10.1 5/26/2011
12.1*       
21.1*       
23.1*       
23.2*       
23.3*       

3


Exhibit  Incorporated by Reference (File No. 001-05153, unless otherwise indicated)
Number Exhibit DescriptionForm Exhibit Filing Date
99.4* Summary report of audits performed by Netherland, Sewell & Associates, Inc., independent petroleum engineers and geologists for 2014     
99.5 Summary report of audits performed by Netherland, Sewell & Associates, Inc., independent petroleum engineers and geologists for 201310-K 99.4 3/2/2015
99.6 Summary report of audits performed by Netherland, Sewell & Associates, Inc., independent petroleum engineers and geologists for 201210-K 99.4 2/28/2014
99.7* Summary report of audits performed by Ryder Scott Company, L.P., independent petroleum engineers and geologists for 2014     
99.8 Summary report of audits performed by Ryder Scott Company, L.P., independent petroleum engineers and geologists for 201310-K 99.7 3/2/2015
99.9 Summary report of audits performed by Ryder Scott Company, L.P., independent petroleum engineers and geologists for 201210-K 99.7 2/28/2014
101.INS* 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.
** Furnished, not filed.
 Management contract or compensatory plan or arrangement.
Exhibit   Incorporated by Reference (File No. 001-05153, unless otherwise indicated)
Number Exhibit Description Form Exhibit Filing Date
23.4*       
23.5*       
31.1*       
31.2*       
32.1*       
32.2*       
99.1  10-K 99.1 2/25/2016
99.2*       
99.3*       
99.4*       
99.5  10-K 99.3 2/24/2017
99.6  10-K 99.4 2/24/2017
99.7*       
99.8  10-K 99.6 2/24/2017
99.9*       
101.INS* 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