EOG Resources (EOG) 10-Q 3 May 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 26, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	EOG RESOURCES INC
Entity Central Index Key	821,189
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		578,861,268
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018

Consolidated Statements of Inco

Consolidated Statements of Income and Comprehensive Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Revenues and Other
Crude Oil and Condensate	$ 2,101,308	$ 1,430,061
Natural Gas Liquids	221,415	153,444
Natural Gas	299,766	230,602
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts	(59,771)	62,020
Gathering, Processing and Marketing	1,101,822	726,537
Losses on Asset Dispositions, Net	(14,969)	(16,758)
Other, Net	31,591	24,659
Total	3,681,162	2,610,565
Operating Expenses
Lease and Well	300,064	255,777
Transportation Costs	176,957	178,714
Gathering and Processing Costs	101,345	38,144
Exploration Costs	34,836	56,894
Impairments	64,609	193,187
Marketing Costs	1,106,390	736,536
Depreciation, Depletion and Amortization	748,591	816,036
General and Administrative	94,698	97,238
Taxes Other Than Income	179,084	130,293
Total	2,806,574	2,502,819
Operating Income	874,588	107,746
Other Income, Net	727	3,151
Income Before Interest Expense and Income Taxes	875,315	110,897
Interest Expense
Interest Expense, Net	61,956	71,515
Income Before Income Taxes	813,359	39,382
Income Tax Provision	174,770	10,865
Net Income	$ 638,589	$ 28,517
Net Income Per Share
Basic	$ 1.11	$ 0.05
Diluted	1.10	0.05
Dividends Declared per Common Share	$ 0.1850	$ 0.1675
Average Number of Common Shares
Basic	575,775	573,935
Diluted	579,726	578,593
Other Comprehensive Income
Foreign Currency Translation Adjustments	$ 5,002	$ 309
Other, Net of Tax	6	37
Other Comprehensive Income	5,008	346
Comprehensive Income	$ 643,597	$ 28,863

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current Assets
Cash and Cash Equivalents	$ 816,094	$ 834,228
Accounts Receivable, Net	1,702,100	1,597,494
Inventories	584,729	483,865
Assets from Price Risk Management Activities	761	7,699
Income Taxes Receivable	262,789	113,357
Other	218,624	242,465
Total	3,585,097	3,279,108
Property, Plant and Equipment
Oil and Gas Properties (Successful Efforts Method)	53,854,438	52,555,741
Other Property, Plant and Equipment	4,082,781	3,960,759
Total Property, Plant and Equipment	57,937,219	56,516,500
Less: Accumulated Depreciation, Depletion and Amortization	(31,561,571)	(30,851,463)
Total Property, Plant and Equipment, Net	26,375,648	25,665,037
Deferred Income Taxes	18,182	17,506
Other Assets	761,590	871,427
Total Assets	30,740,517	29,833,078
Current Liabilities
Accounts Payable	1,915,651	1,847,131
Accrued Taxes Payable	179,646	148,874
Dividends Payable	106,521	96,410
Liabilities from Price Risk Management Activities	84,128	50,429
Current Portion of Long-Term Debt	363,155	356,235
Other	187,657	226,463
Total	2,836,758	2,725,542
Long-Term Debt	6,071,604	6,030,836
Other Liabilities	1,301,938	1,275,213
Deferred Income Taxes	3,689,578	3,518,214
Commitments and Contingencies (Note 8)
Stockholders' Equity
Common Stock, $0.01 Par, 1,280,000,000 Shares Authorized and 579,272,616 Shares Issued at March 31, 2018 and 578,827,768 Shares Issued at December 31, 2017	205,793	205,788
Additional Paid in Capital	5,569,194	5,536,547
Accumulated Other Comprehensive Loss	(14,289)	(19,297)
Retained Earnings	11,125,051	10,593,533
Common Stock Held in Treasury, 459,990 Shares at March 31, 2018 and 350,961 Shares at December 31, 2017	(45,110)	(33,298)
Total Stockholders' Equity	16,840,639	16,283,273
Total Liabilities and Stockholders' Equity	$ 30,740,517	$ 29,833,078

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2018	Dec. 31, 2017
Common Stock
Common Stock, Par Value (in dollars per share)	$ 0.01	$ 0.01
Common Stock, Shares Authorized (in shares)	1,280,000,000	1,280,000,000
Common Stock, Shares Issued (in shares)	579,272,616	578,827,768
Treasury Stock (in shares)
Common Stock Held in Treasury, Shares	459,990	350,961

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities
Net Income	$ 638,589	$ 28,517
Items Not Requiring (Providing) Cash
Depreciation, Depletion and Amortization	748,591	816,036
Impairments	64,609	193,187
Stock-Based Compensation Expenses	35,486	30,460
Deferred Income Taxes	171,362	694
Losses on Asset Dispositions, Net	(14,969)	(16,758)
Other, Net	2,013	(3,052)
Mark-to-Market Commodity Derivative Contracts
Total (Gains) Losses	59,771	(62,020)
Net Cash Received from (Payments for) Settlements of Commodity Derivative Contracts	(21,965)	1,912
Other, Net	(478)	(428)
Changes in Components of Working Capital and Other Assets and Liabilities
Accounts Receivable	(109,654)	28,688
Inventories	(106,799)	24,736
Accounts Payable	53,652	20,426
Accrued Taxes Payable	21,950	(38,613)
Other Assets	(8,863)	(44,677)
Other Liabilities	(29,055)	(51,251)
Changes in Components of Working Capital Associated with Investing and Financing Activities	17,988	(63,324)
Net Cash Provided by Operating Activities	1,552,166	898,049
Investing Cash Flows
Additions to Oil and Gas Properties	(1,365,111)	(912,227)
Additions to Other Property, Plant and Equipment	(76,100)	(34,336)
Proceeds from Sales of Assets	2,829	46,812
Changes in Components of Working Capital Associated with Investing Activities	(18,045)	63,324
Net Cash Used in Investing Activities	(1,456,427)	(836,427)
Financing Cash Flows
Dividends Paid	(97,026)	(96,707)
Treasury Stock Purchased	(16,776)	(18,628)
Proceeds from Stock Options Exercised and Employee Stock Purchase Plan	1,453	2,356
Repayment of Capital Lease Obligation	(1,671)	(1,619)
Changes in Components of Working Capital Associated with Financing Activities	57	0
Net Cash Used in Financing Activities	(113,963)	(114,598)
Effect of Exchange Rate Changes on Cash	90	(353)
Decrease in Cash and Cash Equivalents	(18,134)	(53,329)
Cash and Cash Equivalents at Beginning of Period	834,228	1,599,895
Cash and Cash Equivalents at End of Period	$ 816,094	$ 1,546,566

Summary of Significant Accounti

Summary of Significant Accounting Policies (Notes)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies General. The condensed consolidated financial statements of EOG Resources, Inc., together with its subsidiaries (collectively, EOG), included herein have been prepared by management without audit pursuant to the rules and regulations of the United States Securities and Exchange Commission (SEC). Accordingly, they reflect all normal recurring adjustments which are, in the opinion of management, necessary for a fair presentation of the financial results for the interim periods presented. Certain information and notes normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America (U.S. GAAP) have been condensed or omitted pursuant to such rules and regulations. However, management believes that the disclosures included either on the face of the financial statements or in these notes are sufficient to make the interim information presented not misleading. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and the notes thereto included in EOG's Annual Report on Form 10-K for the year ended December 31, 2017 , filed on February 27, 2018 (EOG's 2017 Annual Report). The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. The operating results for the three months ended March 31, 2018 , are not necessarily indicative of the results to be expected for the full year. Effective January 1, 2018, EOG adopted the provisions of Accounting Standards Update (ASU) 2014-09, "Revenue From Contracts With Customers" (ASU 2014-09). ASU 2014-09 and other related ASUs require entities to recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. EOG elected to adopt ASU 2014-09 using the modified retrospective approach, which required EOG to recognize in retained earnings the cumulative effect at the date of adoption for all existing contracts with customers which were not substantially complete as of January 1, 2018. There was no impact to retained earnings upon adoption of ASU 2014-09. EOG presents disaggregated revenues by type of commodity within its Condensed Consolidated Statements of Income and Comprehensive Income and by geographic areas defined as operating segments. See Note 5. In connection with the adoption of ASU 2014-09, EOG presents natural gas processing fees for certain processing and marketing agreements within its United States segment as Gathering and Processing Costs, instead of a deduction to Revenues within its Condensed Consolidated Statements of Income and Comprehensive Income. There was no impact to operating income, net income or cash flows resulting from changes to the presentation of natural gas processing fees. The impacts of the adoption of ASU 2014-09 for the three months ended March 31, 2018, were as follows (in thousands): As Reported Amounts Without Adoption of ASU 2014-09 Effect of Change Operating Revenues and Other Crude Oil and Condensate $ 2,101,308 $ 2,101,308 $ — Natural Gas Liquids 221,415 219,646 1,769 Natural Gas 299,766 256,620 43,146 Gathering, Processing and Marketing 1,101,822 1,096,236 5,586 Total Operating Revenues and Other 3,681,162 3,630,661 50,501 Operating Expenses Gathering and Processing Costs 101,345 56,430 44,915 Marketing Costs 1,106,390 1,100,804 5,586 Total Operating Expenses 2,806,574 2,756,073 50,501 Operating Income 874,588 874,588 — Revenues are recognized for the sale of crude oil and condensate, natural gas liquids (NGLs) and natural gas at the point control of the product is transferred to the customer, typically when production is delivered and title or risk of loss transfers to the customer. Arrangements for such sales are evidenced by signed contracts with prices typically based on stated market indices, with certain adjustments for product quality and geographic location. As EOG typically invoices customers shortly after performance obligations have been fulfilled, contract assets and contract liabilities are not recognized. The balances of accounts receivable from contracts with customers on January 1, 2018 and March 31, 2018, were $1,343 million and $1,428 million , respectively, and are included in Accounts Receivable, Net on the Condensed Consolidated Balance Sheets. Losses incurred on receivables from contracts with customers are infrequent and have been immaterial. Crude Oil and Condensate. EOG sells its crude oil and condensate production at the wellhead or further downstream at a contractually-specified delivery point. Revenue is recognized when control transfers to the customer. Any costs incurred prior to the transfer of control, such as gathering and transportation, are recognized as Operating Expenses. Natural Gas Liquids. EOG delivers certain of its natural gas production to either EOG-owned processing facilities or third-party processing facilities, where extraction of NGLs occurs. For EOG-owned facilities, revenue is recognized after processing upon transfer of NGLs to a customer. For third-party facilities, extracted NGLs are sold to the owner of the processing facility at the tailgate, or EOG takes possession and sells the extracted NGLs at the tailgate or further downstream to various customers. Under typical arrangements, sales of NGLs are recognized when control transfers after processing occurs either at the tailgate of the processing plant or further downstream. EOG recognizes revenues based on contract terms which reflect prevailing market prices, with processing fees recognized as Gathering and Processing Costs. Natural Gas. EOG sells its natural gas production either at the wellhead or further downstream at a contractually-specified delivery point. In connection with the extraction of NGLs, EOG sells residue gas under separate agreements. Typically, EOG takes possession of the natural gas at the tailgate of the processing facility and sells it at the tailgate or further downstream. In each case, EOG recognizes revenues when control transfers to the customer, based on contract terms which reflect prevailing market prices. Gathering, Processing and Marketing. Gathering, processing and marketing revenues represent sales of third-party crude oil and condensate, NGLs and natural gas, as well as fees associated with processing and gathering third-party natural gas and revenues from sales of EOG-owned sand. EOG evaluates whether it is the principal or agent under these transactions. As control of the underlying commodity is transferred to EOG prior to the gathering, processing and marketing activities, EOG considers itself the principal of these arrangements. Accordingly, EOG recognizes these transactions on a gross basis. Purchases of third-party commodities are recorded as Marketing Costs, with sales of third-party commodities and fees received for gathering and processing recorded as Gathering, Processing and Marketing revenues. Recently Issued Accounting Standards. In March 2018, the Financial Accounting Standards Board (FASB) issued ASU 2018-05, "Income Taxes (Topic 740) - Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 118" (ASU 2018-05). In December 2017, the United States (U.S.) enacted the Tax Cuts and Jobs Act (TCJA), which made significant changes to U.S. federal income tax law. Shortly after enactment of the TCJA, the SEC staff issued Staff Accounting Bulletin No. 118 (SAB 118), which provides guidance on accounting for the impact of the TCJA. ASU 2018-05 codified various paragraphs of SAB 118 and was effective upon issuance. Under SAB 118, an entity would use a similar approach as the measurement period provided in the Business Combinations Topic of the Accounting Standards Codification (ASC). An entity will recognize those matters for which the accounting can be completed. For matters that have not been completed, the entity would either (1) recognize provisional amounts to the extent that they are reasonably able to be estimated and adjust them over time as more information becomes available or (2) for any specific income tax effects of the TCJA for which a reasonable estimate cannot be determined, continue to apply the Income Taxes Topic of the ASC on the basis of the provisions of the tax laws that were in effect immediately before the TCJA was signed into law. EOG has prepared its condensed consolidated financial statements for the three months ended March 31, 2018 in accordance with ASU 2018-05. EOG expects to have all provisional amounts finalized by the fourth quarter of 2018. As discussed in EOG's 2017 Annual Report, provisional amounts were recorded for the impact of the statutory rate reduction from 35% to 21% and the deemed repatriation tax on foreign earnings. EOG has not made any measurement period adjustments related to these items during the first quarter of 2018 because the foreign earnings and profits study has not been completed and the impact of certain tax elections on EOG's 2017 federal tax filings have not been fully analyzed. Additionally, EOG recorded a provisional amount in 2017 for its refundable alternative minimum tax (AMT) credits due to the lack of guidance, at that time, on whether any portion of these credits would be sequestered due to a federal budgetary provision. In the first quarter of 2018, the Internal Revenue Service (IRS) affirmed that any refundable AMT credits resulting from the TCJA would be subject to sequestration. EOG does not expect further clarification from the IRS or Office of Management and Budget and therefore considers the accounting for its refundable AMT credits complete. In February 2016, the FASB issued ASU 2016-02, "Leases (Topic 842)" (ASU 2016-02), which significantly changes accounting for leases by requiring that lessees recognize a right-of-use asset and a related lease liability representing the obligation to make lease payments, for certain lease transactions. Additional disclosures about an entity's lease transactions will also be required. ASU 2016-02 defines a lease as "a contract, or part of a contract, that conveys the right to control the use of identified property, plant or equipment (an identified asset) for a period of time in exchange for consideration." In January 2018, the FASB issued ASU 2018-01, "Leases (Topic 842) - Land Easement Practical Expedient for Transition to Topic 842" (ASU 2018-01), which permits an entity an optional election to not evaluate under ASU 2016-02 those existing or expired land easements that were not previously accounted for as leases prior to the adoption of ASU 2016-02. ASU 2016-02 and ASU 2018-01 are effective for interim and annual periods beginning after December 31, 2018, and early application is permitted. Lessees and lessors are required to recognize and measure leases at the beginning of the earliest period presented in the financial statements using a modified retrospective approach. EOG is continuing its assessment of ASU 2016-02 by implementing its project plan, evaluating certain operational and corporate policies and processes, further defining its population of leases, reviewing certain contracts and considering the election of practical expedients.

Stock-Based Compensation (Notes

Stock-Based Compensation (Notes)	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation As more fully discussed in Note 7 to the Consolidated Financial Statements included in EOG's 2017 Annual Report, EOG maintains various stock-based compensation plans. Stock-based compensation expense is included on the Condensed Consolidated Statements of Income and Comprehensive Income based upon the job function of the employees receiving the grants as follows (in millions): Three Months Ended 2018 2017 Lease and Well $ 12.8 $ 10.9 Gathering and Processing Costs 0.1 0.2 Exploration Costs 6.9 6.2 General and Administrative 15.7 13.2 Total $ 35.5 $ 30.5 The Amended and Restated EOG Resources, Inc. 2008 Omnibus Equity Compensation Plan (2008 Plan) provides for grants of stock options, stock-settled stock appreciation rights (SARs), restricted stock and restricted stock units, performance units and performance stock and other stock-based awards. At March 31, 2018 , approximately 16.8 million common shares remained available for grant under the 2008 Plan. EOG's policy is to issue shares related to the 2008 Plan from previously authorized unissued shares or treasury shares to the extent treasury shares are available. Stock Options and Stock-Settled Stock Appreciation Rights and Employee Stock Purchase Plan . The fair value of stock option grants and SAR grants is estimated using the Hull-White II binomial option pricing model. The fair value of Employee Stock Purchase Plan (ESPP) grants is estimated using the Black-Scholes-Merton model. Stock-based compensation expense related to stock option, SAR and ESPP grants totaled $12.0 million and $11.0 million during the three months ended March 31, 2018 and 2017 , respectively. Weighted average fair values and valuation assumptions used to value stock option, SAR and ESPP grants during the three -month periods ended March 31, 2018 and 2017 are as follows: Stock Options/SARs ESPP Three Months Ended Three Months Ended 2018 2017 2018 2017 Weighted Average Fair Value of Grants $ 28.19 $ 29.13 $ 23.27 $ 24.28 Expected Volatility 29.01 % 31.67 % 22.04 % 30.33 % Risk-Free Interest Rate 2.09 % 1.36 % 1.60 % 0.65 % Dividend Yield 0.66 % 0.67 % 0.66 % 0.69 % Expected Life 5.0 years 5.3 years 0.5 years 0.5 years Expected volatility is based on an equal weighting of historical volatility and implied volatility from traded options in EOG's common stock. The risk-free interest rate is based upon United States Treasury yields in effect at the time of grant. The expected life is based upon historical experience and contractual terms of stock option, SAR and ESPP grants. The following table sets forth stock option and SAR transactions for the three -month periods ended March 31, 2018 and 2017 (stock options and SARs in thousands): Three Months Ended Three Months Ended Number of Stock Options/SARs Weighted Average Grant Price Number of Stock Options/SARs Weighted Average Grant Price Outstanding at January 1 9,103 $ 83.89 9,850 $ 75.53 Granted 16 106.76 5 101.61 Exercised (1) (752 ) 74.65 (600 ) 57.53 Forfeited (77 ) 91.94 (99 ) 88.57 Outstanding at March 31 (2) 8,290 $ 84.70 9,156 $ 76.59 Vested or Expected to Vest (3) 7,940 $ 84.38 8,849 $ 76.20 Exercisable at March 31 (4) 3,803 $ 76.16 5,078 $ 67.74 (1) The total intrinsic value of stock options/SARs exercised for the three months ended March 31, 2018 and 2017 was $28.4 million and $26.6 million , respectively. The intrinsic value is based upon the difference between the market price of EOG's common stock on the date of exercise and the grant price of the stock options/SARs. (2) The total intrinsic value of stock options/SARs outstanding at March 31, 2018 and 2017 was $170.7 million and $199.3 million , respectively. At March 31, 2018 and 2017 , the weighted average remaining contractual life was 4.3 years and 3.8 years , respectively. (3) The total intrinsic value of stock options/SARs vested or expected to vest at March 31, 2018 and 2017 was $166.1 million and $196.0 million , respectively. At March 31, 2018 and 2017 , the weighted average remaining contractual life was 4.2 years and 3.8 years , respectively. (4) The total intrinsic value of stock options/SARs exercisable at March 31, 2018 and 2017 was $110.8 million and $155.5 million , respectively. At March 31, 2018 and 2017 , the weighted average remaining contractual life was 2.6 years and 2.4 years , respectively. At March 31, 2018 , unrecognized compensation expense related to non-vested stock option, SAR and ESPP grants totaled $88.2 million . Such unrecognized expense will be amortized on a straight-line basis over a weighted average period of 1.7 years . Restricted Stock and Restricted Stock Units. Employees may be granted restricted (non-vested) stock and/or restricted stock units without cost to them. Stock-based compensation expense related to restricted stock and restricted stock units totaled $22.4 million and $18.6 million for the three months ended March 31, 2018 and 2017 , respectively. The following table sets forth restricted stock and restricted stock unit transactions for the three -month periods ended March 31, 2018 and 2017 (shares and units in thousands): Three Months Ended Three Months Ended Number of Shares and Units Weighted Average Grant Date Fair Value Number of Shares and Units Weighted Average Grant Date Fair Value Outstanding at January 1 3,905 $ 88.57 3,962 $ 79.63 Granted 279 102.27 402 99.52 Released (1) (276 ) 66.46 (360 ) 61.96 Forfeited (75 ) 90.65 (82 ) 82.83 Outstanding at March 31 (2) 3,833 $ 91.12 3,922 $ 83.22 (1) The total intrinsic value of restricted stock and restricted stock units released for the three months ended March 31, 2018 and 2017 was $28.4 million and $36.0 million , respectively. The intrinsic value is based upon the closing price of EOG's common stock on the date the restricted stock and restricted stock units are released. (2) The total intrinsic value of restricted stock and restricted stock units outstanding at March 31, 2018 and 2017 was $403.5 million and $382.6 million , respectively. At March 31, 2018 , unrecognized compensation expense related to restricted stock and restricted stock units totaled $172.7 million . Such unrecognized expense will be amortized on a straight-line basis over a weighted average period of 2.4 years . Performance Units and Performance Stock. EOG has granted performance units and/or performance stock (collectively, Performance Awards) to its executive officers annually since 2012. As more fully discussed in the grant agreements, the performance metric applicable to the Performance Awards is EOG's total shareholder return over a three -year performance period relative to the total shareholder return of a designated group of peer companies (Performance Period). Upon the application of the performance multiple at the completion of the Performance Period, a minimum of 0% and a maximum of 200% of the Performance Awards granted could be outstanding. The fair value of the Performance Awards is estimated using a Monte Carlo simulation. Stock-based compensation expense related to the Performance Award grants totaled $1.1 million and $0.9 million for the three -month periods ended March 31, 2018 and 2017 , respectively. The following table sets forth the Performance Awards transactions for the three -month periods ended March 31, 2018 and 2017 : Three Months Ended Three Months Ended Number of Units Weighted Average Price per Grant Date Number of Units Weighted Average Price per Grant Date Outstanding at January 1 502,331 $ 90.96 545,290 $ 80.92 Granted — — — — Granted for Performance Multiple (1) 71,805 101.87 118,834 84.43 Released (2) — — (89,224 ) 84.43 Forfeited — — — — Outstanding at March 31 (3) 574,136 (4) $ 92.33 574,900 $ 81.10 (1) Upon completion of the Performance Period for the Performance Awards granted in 2014 and 2013, a performance multiple of 200% was applied to each of the grants resulting in additional grants of Performance Awards in February 2018 and February 2017, respectively. (2) The total intrinsic value of Performance Awards released during the three months ended March 31, 2017 was approximately $9 million . (3) The total intrinsic value of Performance Awards outstanding at March 31, 2018 and 2017 was approximately $60.4 million and $56.1 million , respectively. (4) Upon the application of the relevant performance multiple at the completion of each of the remaining Performance Periods, a minimum of 292,054 and a maximum of 856,218 Performance Awards could be outstanding. The intrinsic value is based upon the closing price of EOG's common stock on the date Performance Awards are released. At March 31, 2018 , unrecognized compensation expense related to Performance Awards totaled $7.2 million . Such unrecognized expense will be amortized on a straight-line basis over a weighted average period of 1.8 years .

Net Income Per Share (Notes)

Net Income Per Share (Notes)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Net Income Per Share	Net Income Per Share The following table sets forth the computation of Net Income Per Share for the three -month periods ended March 31, 2018 and 2017 (in thousands, except per share data): Three Months Ended 2018 2017 Numerator for Basic and Diluted Earnings Per Share - Net Income $ 638,589 $ 28,517 Denominator for Basic Earnings Per Share - Weighted Average Shares 575,775 573,935 Potential Dilutive Common Shares - Stock Options/SARs 1,217 1,871 Restricted Stock/Units and Performance Units/Stock 2,734 2,787 Denominator for Diluted Earnings Per Share - Adjusted Diluted Weighted Average Shares 579,726 578,593 Net Income Per Share Basic $ 1.11 $ 0.05 Diluted $ 1.10 $ 0.05 The diluted earnings per share calculation excludes stock options, SARs, restricted stock and units and performance units that were anti-dilutive. Shares underlying the excluded stock options and SARs totaled 0.2 million and 2.0 million shares for the three months ended March 31, 2018 and 2017 , respectively.

Supplemental Cash Flow Informat

Supplemental Cash Flow Information (Notes)	3 Months Ended
	Mar. 31, 2018
Supplemental Cash Flow Information [Abstract]
Supplemental Cash Flow Information	Supplemental Cash Flow Information Net cash paid for interest and income taxes was as follows for the three -month periods ended March 31, 2018 and 2017 (in thousands): Three Months Ended 2018 2017 Interest (1) $ 50,103 $ 77,828 Income Taxes, Net of Refunds Received $ 3,554 $ 81,960 (1) Net of capitalized interest of $5 million and $7 million for the three months ended March 31, 2018 and 2017 , respectively. EOG's accrued capital expenditures at March 31, 2018 and 2017 were $593 million and $415 million , respectively. Non-cash investing activities for the three months ended March 31, 2018 , included a non-cash addition of $48 million to EOG's other property, plant and equipment in connection with a capital lease transaction in the Permian Basin and non-cash additions of $9 million to EOG's oil and gas properties as a result of property exchanges.

Segment Information (Notes)

Segment Information (Notes)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Segment Information	Segment Information Selected financial information by reportable segment is presented below for the three -month periods ended March 31, 2018 and 2017 (in thousands): Three Months Ended 2018 2017 Operating Revenues and Other United States $ 3,571,134 $ 2,519,849 Trinidad 81,013 73,923 Other International (1) 29,015 16,793 Total $ 3,681,162 $ 2,610,565 Operating Income (Loss) United States $ 845,853 $ 119,531 Trinidad 40,297 16,413 Other International (1) (11,562 ) (28,198 ) Total 874,588 107,746 Reconciling Items Other Income, Net 727 3,151 Interest Expense, Net (61,956 ) (71,515 ) Income Before Income Taxes $ 813,359 $ 39,382 (1) Other International primarily consists of EOG's United Kingdom, China and Canada operations. Total assets by reportable segment are presented below at March 31, 2018 and December 31, 2017 (in thousands): At March 31, 2018 At December 31, 2017 Total Assets United States $ 29,780,881 $ 28,312,599 Trinidad 610,376 974,477 Other International (1) 349,260 546,002 Total $ 30,740,517 $ 29,833,078 (1) Other International primarily consists of EOG's United Kingdom, China and Canada operations.

Asset Retirement Obligations (N

Asset Retirement Obligations (Notes)	3 Months Ended
	Mar. 31, 2018
Asset Retirement Obligation [Abstract]
Asset Retirement Obligations	Asset Retirement Obligations The following table presents the reconciliation of the beginning and ending aggregate carrying amounts of short-term and long-term legal obligations associated with the retirement of property, plant and equipment for the three -month periods ended March 31, 2018 and 2017 (in thousands): Three Months Ended 2018 2017 Carrying Amount at January 1 $ 946,848 $ 912,926 Liabilities Incurred 10,279 7,418 Liabilities Settled (1) 50 (11,197 ) Accretion 8,868 8,525 Revisions (291 ) 3,646 Foreign Currency Translations 245 837 Carrying Amount at March 31 $ 965,999 $ 922,155 Current Portion $ 19,177 $ 19,450 Noncurrent Portion $ 946,822 $ 902,705 (1) Includes settlements related to asset sales. The current and noncurrent portions of EOG's asset retirement obligations are included in Current Liabilities - Other and Other Liabilities, respectively, on the Condensed Consolidated Balance Sheets.

Exploratory Well Costs (Notes)

Exploratory Well Costs (Notes)	3 Months Ended
	Mar. 31, 2018
Capitalized Exploratory Well Costs [Abstract]
Exploratory Well Costs	Exploratory Well Costs EOG's net changes in capitalized exploratory well costs for the three -month period ended March 31, 2018 , are presented below (in thousands): Three Months Ended Balance at January 1 $ 2,167 Additions Pending the Determination of Proved Reserves 1,102 Reclassifications to Proved Properties (509 ) Costs Charged to Expense — Balance at March 31 $ 2,760 At March 31, 2018 , all capitalized exploratory well costs had been capitalized for periods of less than one year.

Commitments and Contingencies (

Commitments and Contingencies (Notes)	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies There are currently various suits and claims pending against EOG that have arisen in the ordinary course of EOG's business, including contract disputes, personal injury and property damage claims and title disputes. While the ultimate outcome and impact on EOG cannot be predicted, management believes that the resolution of these suits and claims will not, individually or in the aggregate, have a material adverse effect on EOG's consolidated financial position, results of operations or cash flow. EOG records reserves for contingencies when information available indicates that a loss is probable and the amount of the loss can be reasonably estimated.

Pension and Postretirement Bene

Pension and Postretirement Benefits (Notes)	3 Months Ended
	Mar. 31, 2018
Retirement Benefits [Abstract]
Pension and Postretirement Benefits	Pension and Postretirement Benefits EOG has defined contribution pension plans in place for most of its employees in the United States, Trinidad and the United Kingdom, and a defined benefit pension plan covering certain of its employees in Trinidad. For the three months ended March 31, 2018 and 2017 , EOG's total costs recognized for these pension plans were $9.9 million and $10.0 million , respectively. EOG also has postretirement medical and dental plans in place for eligible employees and their dependents in the United States and Trinidad, the costs of which are not material.

Long-Term Debt (Notes)

Long-Term Debt (Notes)	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Long-Term Debt	Long-Term Debt During the three months ended March 31, 2018, EOG utilized commercial paper borrowings, bearing market interest rates, for various corporate financing purposes. EOG did not utilize any such borrowings during the three months ended March 31, 2017. At March 31, 2018 and December 31, 2017, EOG had no outstanding commercial paper borrowings or uncommitted credit facility borrowings. The average borrowings outstanding under the commercial paper program were $18 million and zero during the three months ended March 31, 2018 and March 31, 2017, respectively. The weighted average interest rate for commercial paper borrowings during the three months ended March 31, 2018, was 1.76% . EOG currently has a $2.0 billion senior unsecured Revolving Credit Agreement (Agreement) with domestic and foreign lenders. The Agreement has a scheduled maturity date of July 21, 2020 , and includes an option for EOG to extend, on up to two occasions, the term for successive one-year periods subject to certain terms and conditions. Advances under the Agreement will accrue interest based, at EOG's option, on either the London InterBank Offered Rate plus an applicable margin (Eurodollar rate) or the base rate (as defined in the Agreement) plus an applicable margin. At March 31, 2018 and December 31, 2017, there were no borrowings or letters of credit outstanding under the Agreement. The Eurodollar rate and applicable base rate, had there been any amounts borrowed under the Agreement at March 31, 2018, would have been 2.88% and 4.75% , respectively.

Fair Value Measurements (Notes)

Fair Value Measurements (Notes)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements As more fully discussed in Note 13 to the Consolidated Financial Statements included in EOG's 2017 Annual Report, certain of EOG's financial and nonfinancial assets and liabilities are reported at fair value on the Condensed Consolidated Balance Sheets. The following table provides fair value measurement information within the fair value hierarchy for certain of EOG's financial assets and liabilities carried at fair value on a recurring basis at March 31, 2018 and December 31, 2017 (in millions): Fair Value Measurements Using: Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total At March 31, 2018 Financial Assets: Natural Gas Swaps $ — $ 2 $ — $ 2 Natural Gas Options — 4 — 4 Crude Oil Basis Swaps — 35 — 35 Financial Liabilities: Crude Oil Swaps $ — $ 117 $ — $ 117 At December 31, 2017 Financial Assets: Natural Gas Swaps $ — $ 2 $ — $ 2 Natural Gas Options/Collars — 6 — 6 Financial Liabilities: Crude Oil Swaps $ — $ 38 $ — $ 38 Crude Oil Basis Swaps — 19 — 19 The estimated fair value of commodity derivative contracts was based upon forward commodity price curves based on quoted market prices. Commodity derivative contracts were valued by utilizing an independent third-party derivative valuation provider who uses various types of valuation models, as applicable. The initial measurement of asset retirement obligations at fair value is calculated using discounted cash flow techniques and based on internal estimates of future retirement costs associated with property, plant and equipment. Significant Level 3 inputs used in the calculation of asset retirement obligations include plugging costs and reserve lives. A reconciliation of EOG's asset retirement obligations is presented in Note 6. Proved oil and gas properties and other assets with a carrying amount of $151 million were written down to their fair value of $129 million , resulting in pretax impairment charges of $22 million for the three months ended March 31, 2018 . Included in the $22 million pretax impairment charges are $21 million for a commodity price-related write-down of other assets. EOG utilized average prices per acre from comparable market transactions as the basis for determining the fair value of unproved properties received in non-cash property exchanges. See Note 4. Fair Value of Debt. At March 31, 2018 and December 31, 2017 , EOG had outstanding $6,390 million aggregate principal amount of senior notes, which had estimated fair values at such dates of approximately $6,470 million and $6,602 million , respectively. The estimated fair value of debt was based upon quoted market prices and, where such prices were not available, other observable (Level 2) inputs regarding interest rates available to EOG at the end of each respective period.

Risk Management Activities (Not

Risk Management Activities (Notes)	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Risk Management Activities	Risk Management Activities Commodity Price Risk . As more fully discussed in Note 12 to the Consolidated Financial Statements included in EOG's 2017 Annual Report, EOG engages in price risk management activities from time to time. These activities are intended to manage EOG's exposure to fluctuations in commodity prices for crude oil and natural gas. EOG utilizes financial commodity derivative instruments, primarily price swap, option, swaption, collar and basis swap contracts, as a means to manage this price risk. EOG has not designated any of its financial commodity derivative contracts as accounting hedges and, accordingly, accounts for financial commodity derivative contracts using the mark-to-market accounting method. Commodity Derivative Contracts. Prices received by EOG for its crude oil production generally vary from U.S. New York Mercantile Exchange (NYMEX) West Texas Intermediate prices due to adjustments for delivery location (basis) and other factors. EOG has entered into crude oil basis swap contracts in order to fix the differential between pricing in Midland, Texas, and Cushing, Oklahoma (Midland Differential). Presented below is a comprehensive summary of EOG's Midland Differential basis swap contracts for the three months ended March 31, 2018 . The weighted average price differential expressed in dollars per barrel ($/Bbl) represents the amount of reduction to Cushing, Oklahoma, prices for the notional volumes expressed in barrels per day (Bbld) covered by the basis swap contracts. Midland Differential Basis Swap Contracts Volume (Bbld) Weighted Average Price Differential ($/Bbl) 2018 January 1, 2018 through April 30, 2018 (closed) 15,000 $ 1.063 May 1, 2018 through December 31, 2018 15,000 1.063 2019 January 1, 2019 through December 31, 2019 20,000 $ 1.075 EOG has also entered into crude oil basis swap contracts in order to fix the differential between pricing in the U.S. Gulf Coast and Cushing, Oklahoma (Gulf Coast Differential). Presented below is a comprehensive summary of EOG's Gulf Coast Differential basis swap contracts for the three months ended March 31, 2018 . The weighted average price differential expressed in $/Bbl represents the amount of addition to Cushing, Oklahoma, prices for the notional volumes expressed in Bbld covered by the basis swap contracts. Gulf Coast Differential Basis Swap Contracts Volume (Bbld) Weighted Average Price Differential ($/Bbl) 2018 January 1, 2018 through April 30, 2018 (closed) 37,000 $ 3.818 May 1, 2018 through December 31, 2018 37,000 3.818 Presented below is a comprehensive summary of EOG's crude oil price swap contracts for the three months ended March 31, 2018 , with notional volumes expressed in Bbld and prices expressed in $/Bbl. Crude Oil Price Swap Contracts Volume (Bbld) Weighted Average Price ($/Bbl) 2018 January 1, 2018 through March 31, 2018 (closed) 134,000 $ 60.04 April 1, 2018 through December 31, 2018 134,000 60.04 Presented below is a comprehensive summary of EOG's natural gas price swap contracts for the three months ended March 31, 2018 , with notional volumes expressed in million British thermal units (MMBtu) per day (MMBtud) and prices expressed in dollars per MMBtu ($/MMBtu). Natural Gas Price Swap Contracts Volume (MMBtud) Weighted Average Price ($/MMBtu) 2018 March 1, 2018 through April 30, 2018 (closed) 35,000 $ 3.00 May 1, 2018 through November 30, 2018 35,000 3.00 EOG has sold call options which establish a ceiling price for the sale of notional volumes of natural gas as specified in the call option contracts. The call options require that EOG pay the difference between the call option strike price and either the average or last business day NYMEX Henry Hub natural gas price for the contract month (Henry Hub Index Price) in the event the Henry Hub Index Price is above the call option strike price. In addition, EOG has purchased put options which establish a floor price for the sale of notional volumes of natural gas as specified in the put option contracts. The put options grant EOG the right to receive the difference between the put option strike price and the Henry Hub Index Price in the event the Henry Hub Index Price is below the put option strike price. Presented below is a comprehensive summary of EOG's natural gas call and put option contracts for the three months ended March 31, 2018 , with notional volumes expressed in MMBtud and prices expressed in $/MMBtu. Natural Gas Option Contracts Call Options Sold Put Options Purchased Volume (MMBtud) Weighted Volume (MMBtud) Weighted 2018 March 1, 2018 through April 30, 2018 (closed) 120,000 $ 3.38 96,000 $ 2.94 May 1, 2018 through November 30, 2018 120,000 3.38 96,000 2.94 The following table sets forth the amounts and classification of EOG's outstanding financial derivative instruments at March 31, 2018 and December 31, 2017 . Certain amounts may be presented on a net basis on the Condensed Consolidated Financial Statements when such amounts are with the same counterparty and subject to a master netting arrangement (in millions): Fair Value at Description Location on Balance Sheet March 31, 2018 December 31, 2017 Asset Derivatives Crude oil and natural gas derivative contracts - Current portion Assets from Price Risk Management Activities $ 1 $ 8 Noncurrent portion Other Assets 7 — Liability Derivatives Crude oil and natural gas derivative contracts - Current portion Liabilities from Price Risk Management Activities (1) $ 84 $ 50 Noncurrent portion Other Liabilities — 7 (1) The current portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $117 million , partially offset by gross assets of $33 million at March 31, 2018, and gross liabilities of $55 million , partially offset by gross assets of $5 million at December 31, 2017. Credit Risk. Notional contract amounts are used to express the magnitude of a financial derivative. The amounts potentially subject to credit risk, in the event of nonperformance by the counterparties, are equal to the fair value of such contracts (see Note 11). EOG evaluates its exposure to significant counterparties on an ongoing basis, including those arising from physical and financial transactions. In some instances, EOG renegotiates payment terms and/or requires collateral, parent guarantees or letters of credit to minimize credit risk. All of EOG's derivative instruments are covered by International Swap Dealers Association Master Agreements (ISDAs) with counterparties. The ISDAs may contain provisions that require EOG, if it is the party in a net liability position, to post collateral when the amount of the net liability exceeds the threshold level specified for EOG's then-current credit ratings. In addition, the ISDAs may also provide that as a result of certain circumstances, including certain events that cause EOG's credit ratings to become materially weaker than its then-current ratings, the counterparty may require all outstanding derivatives under the ISDAs to be settled immediately. See Note 11 for the aggregate fair value of all derivative instruments that were in a net liability position at March 31, 2018 and December 31, 2017 . EOG had no collateral posted and held no collateral at March 31, 2018 and December 31, 2017 .

Acquisitions and Divestitures (

Acquisitions and Divestitures (Notes)	3 Months Ended
	Mar. 31, 2018
Discontinued Operations and Disposal Groups [Abstract]
Acquisitions and Divestitures	Acquisitions and Divestitures During the three months ended March 31, 2018 , EOG recognized a net loss on asset dispositions of $(15) million , primarily due to the disposition of inventory and other assets, and received proceeds of approximately $3 million . During the three months ended March 31, 2017 , EOG recognized a net loss on asset dispositions of $(17) million and received proceeds of approximately $47 million primarily from the sale of other property, plant and equipment in Texas.

Summary of Significant Accoun19

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Schedule of Impact of Adoption of New Revenue Recognition Standard (Tables)	The impacts of the adoption of ASU 2014-09 for the three months ended March 31, 2018, were as follows (in thousands): As Reported Amounts Without Adoption of ASU 2014-09 Effect of Change Operating Revenues and Other Crude Oil and Condensate $ 2,101,308 $ 2,101,308 $ — Natural Gas Liquids 221,415 219,646 1,769 Natural Gas 299,766 256,620 43,146 Gathering, Processing and Marketing 1,101,822 1,096,236 5,586 Total Operating Revenues and Other 3,681,162 3,630,661 50,501 Operating Expenses Gathering and Processing Costs 101,345 56,430 44,915 Marketing Costs 1,106,390 1,100,804 5,586 Total Operating Expenses 2,806,574 2,756,073 50,501 Operating Income 874,588 874,588 —

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	3 Months Ended
	Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs	Stock-based compensation expense is included on the Condensed Consolidated Statements of Income and Comprehensive Income based upon the job function of the employees receiving the grants as follows (in millions): Three Months Ended 2018 2017 Lease and Well $ 12.8 $ 10.9 Gathering and Processing Costs 0.1 0.2 Exploration Costs 6.9 6.2 General and Administrative 15.7 13.2 Total $ 35.5 $ 30.5
Weighted Average Fair Values and Valuation Assumptions	Weighted average fair values and valuation assumptions used to value stock option, SAR and ESPP grants during the three -month periods ended March 31, 2018 and 2017 are as follows: Stock Options/SARs ESPP Three Months Ended Three Months Ended 2018 2017 2018 2017 Weighted Average Fair Value of Grants $ 28.19 $ 29.13 $ 23.27 $ 24.28 Expected Volatility 29.01 % 31.67 % 22.04 % 30.33 % Risk-Free Interest Rate 2.09 % 1.36 % 1.60 % 0.65 % Dividend Yield 0.66 % 0.67 % 0.66 % 0.69 % Expected Life 5.0 years 5.3 years 0.5 years 0.5 years
Stock Options and SARs Transactions	The following table sets forth stock option and SAR transactions for the three -month periods ended March 31, 2018 and 2017 (stock options and SARs in thousands): Three Months Ended Three Months Ended Number of Stock Options/SARs Weighted Average Grant Price Number of Stock Options/SARs Weighted Average Grant Price Outstanding at January 1 9,103 $ 83.89 9,850 $ 75.53 Granted 16 106.76 5 101.61 Exercised (1) (752 ) 74.65 (600 ) 57.53 Forfeited (77 ) 91.94 (99 ) 88.57 Outstanding at March 31 (2) 8,290 $ 84.70 9,156 $ 76.59 Vested or Expected to Vest (3) 7,940 $ 84.38 8,849 $ 76.20 Exercisable at March 31 (4) 3,803 $ 76.16 5,078 $ 67.74 (1) The total intrinsic value of stock options/SARs exercised for the three months ended March 31, 2018 and 2017 was $28.4 million and $26.6 million , respectively. The intrinsic value is based upon the difference between the market price of EOG's common stock on the date of exercise and the grant price of the stock options/SARs. (2) The total intrinsic value of stock options/SARs outstanding at March 31, 2018 and 2017 was $170.7 million and $199.3 million , respectively. At March 31, 2018 and 2017 , the weighted average remaining contractual life was 4.3 years and 3.8 years , respectively. (3) The total intrinsic value of stock options/SARs vested or expected to vest at March 31, 2018 and 2017 was $166.1 million and $196.0 million , respectively. At March 31, 2018 and 2017 , the weighted average remaining contractual life was 4.2 years and 3.8 years , respectively. (4) The total intrinsic value of stock options/SARs exercisable at March 31, 2018 and 2017 was $110.8 million and $155.5 million , respectively. At March 31, 2018 and 2017 , the weighted average remaining contractual life was 2.6 years and 2.4 years , respectively.
Restricted Stock and Restricted Stock Unit Transactions	The following table sets forth restricted stock and restricted stock unit transactions for the three -month periods ended March 31, 2018 and 2017 (shares and units in thousands): Three Months Ended Three Months Ended Number of Shares and Units Weighted Average Grant Date Fair Value Number of Shares and Units Weighted Average Grant Date Fair Value Outstanding at January 1 3,905 $ 88.57 3,962 $ 79.63 Granted 279 102.27 402 99.52 Released (1) (276 ) 66.46 (360 ) 61.96 Forfeited (75 ) 90.65 (82 ) 82.83 Outstanding at March 31 (2) 3,833 $ 91.12 3,922 $ 83.22 (1) The total intrinsic value of restricted stock and restricted stock units released for the three months ended March 31, 2018 and 2017 was $28.4 million and $36.0 million , respectively. The intrinsic value is based upon the closing price of EOG's common stock on the date the restricted stock and restricted stock units are released. (2) The total intrinsic value of restricted stock and restricted stock units outstanding at March 31, 2018 and 2017 was $403.5 million and $382.6 million , respectively.
Weighted Average Fair Values and Valuation Assumptions for Performance Award Grants	The following table sets forth the Performance Awards transactions for the three -month periods ended March 31, 2018 and 2017 : Three Months Ended Three Months Ended Number of Units Weighted Average Price per Grant Date Number of Units Weighted Average Price per Grant Date Outstanding at January 1 502,331 $ 90.96 545,290 $ 80.92 Granted — — — — Granted for Performance Multiple (1) 71,805 101.87 118,834 84.43 Released (2) — — (89,224 ) 84.43 Forfeited — — — — Outstanding at March 31 (3) 574,136 (4) $ 92.33 574,900 $ 81.10 (1) Upon completion of the Performance Period for the Performance Awards granted in 2014 and 2013, a performance multiple of 200% was applied to each of the grants resulting in additional grants of Performance Awards in February 2018 and February 2017, respectively. (2) The total intrinsic value of Performance Awards released during the three months ended March 31, 2017 was approximately $9 million . (3) The total intrinsic value of Performance Awards outstanding at March 31, 2018 and 2017 was approximately $60.4 million and $56.1 million , respectively. (4) Upon the application of the relevant performance multiple at the completion of each of the remaining Performance Periods, a minimum of 292,054 and a maximum of 856,218 Performance Awards could be outstanding. The intrinsic value is based upon the closing price of EOG's common stock on the date Performance Awards are released.

Net Income Per Share (Tables)

Net Income Per Share (Tables)	3 Months Ended
	Mar. 31, 2018
Earnings Per Share [Abstract]
Computation of Net Income Per Share	The following table sets forth the computation of Net Income Per Share for the three -month periods ended March 31, 2018 and 2017 (in thousands, except per share data): Three Months Ended 2018 2017 Numerator for Basic and Diluted Earnings Per Share - Net Income $ 638,589 $ 28,517 Denominator for Basic Earnings Per Share - Weighted Average Shares 575,775 573,935 Potential Dilutive Common Shares - Stock Options/SARs 1,217 1,871 Restricted Stock/Units and Performance Units/Stock 2,734 2,787 Denominator for Diluted Earnings Per Share - Adjusted Diluted Weighted Average Shares 579,726 578,593 Net Income Per Share Basic $ 1.11 $ 0.05 Diluted $ 1.10 $ 0.05

Supplemental Cash Flow Inform22

Supplemental Cash Flow Information (Tables)	3 Months Ended
	Mar. 31, 2018
Supplemental Cash Flow Information [Abstract]
Net Cash Paid For Interest and Income Taxes	Net cash paid for interest and income taxes was as follows for the three -month periods ended March 31, 2018 and 2017 (in thousands): Three Months Ended 2018 2017 Interest (1) $ 50,103 $ 77,828 Income Taxes, Net of Refunds Received $ 3,554 $ 81,960 (1) Net of capitalized interest of $5 million and $7 million for the three months ended March 31, 2018 and 2017 , respectively.

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Selected Financial Information by Reportable Segment	Selected financial information by reportable segment is presented below for the three -month periods ended March 31, 2018 and 2017 (in thousands): Three Months Ended 2018 2017 Operating Revenues and Other United States $ 3,571,134 $ 2,519,849 Trinidad 81,013 73,923 Other International (1) 29,015 16,793 Total $ 3,681,162 $ 2,610,565 Operating Income (Loss) United States $ 845,853 $ 119,531 Trinidad 40,297 16,413 Other International (1) (11,562 ) (28,198 ) Total 874,588 107,746 Reconciling Items Other Income, Net 727 3,151 Interest Expense, Net (61,956 ) (71,515 ) Income Before Income Taxes $ 813,359 $ 39,382 (1) Other International primarily consists of EOG's United Kingdom, China and Canada operations.
Assets by Reportable Segment	Total assets by reportable segment are presented below at March 31, 2018 and December 31, 2017 (in thousands): At March 31, 2018 At December 31, 2017 Total Assets United States $ 29,780,881 $ 28,312,599 Trinidad 610,376 974,477 Other International (1) 349,260 546,002 Total $ 30,740,517 $ 29,833,078 (1) Other International primarily consists of EOG's United Kingdom, China and Canada operations.

Asset Retirement Obligations (T

Asset Retirement Obligations (Tables)	3 Months Ended
	Mar. 31, 2018
Asset Retirement Obligation [Abstract]
Asset Retirement Obligation Rollforward Analysis	The following table presents the reconciliation of the beginning and ending aggregate carrying amounts of short-term and long-term legal obligations associated with the retirement of property, plant and equipment for the three -month periods ended March 31, 2018 and 2017 (in thousands): Three Months Ended 2018 2017 Carrying Amount at January 1 $ 946,848 $ 912,926 Liabilities Incurred 10,279 7,418 Liabilities Settled (1) 50 (11,197 ) Accretion 8,868 8,525 Revisions (291 ) 3,646 Foreign Currency Translations 245 837 Carrying Amount at March 31 $ 965,999 $ 922,155 Current Portion $ 19,177 $ 19,450 Noncurrent Portion $ 946,822 $ 902,705 (1) Includes settlements related to asset sales.

Exploratory Well Costs (Tables)

Exploratory Well Costs (Tables)	3 Months Ended
	Mar. 31, 2018
Capitalized Exploratory Well Costs [Abstract]
Net Changes In Capitalized Exploratory Well Costs	EOG's net changes in capitalized exploratory well costs for the three -month period ended March 31, 2018 , are presented below (in thousands): Three Months Ended Balance at January 1 $ 2,167 Additions Pending the Determination of Proved Reserves 1,102 Reclassifications to Proved Properties (509 ) Costs Charged to Expense — Balance at March 31 $ 2,760

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Assets and Liabilities Measured On Recurring Basis	The following table provides fair value measurement information within the fair value hierarchy for certain of EOG's financial assets and liabilities carried at fair value on a recurring basis at March 31, 2018 and December 31, 2017 (in millions): Fair Value Measurements Using: Quoted Prices in Active Markets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Total At March 31, 2018 Financial Assets: Natural Gas Swaps $ — $ 2 $ — $ 2 Natural Gas Options — 4 — 4 Crude Oil Basis Swaps — 35 — 35 Financial Liabilities: Crude Oil Swaps $ — $ 117 $ — $ 117 At December 31, 2017 Financial Assets: Natural Gas Swaps $ — $ 2 $ — $ 2 Natural Gas Options/Collars — 6 — 6 Financial Liabilities: Crude Oil Swaps $ — $ 38 $ — $ 38 Crude Oil Basis Swaps — 19 — 19

Risk Management Activities (Tab

Risk Management Activities (Tables)	3 Months Ended
	Mar. 31, 2018
Derivatives, Fair Value [Line Items]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	The following table sets forth the amounts and classification of EOG's outstanding financial derivative instruments at March 31, 2018 and December 31, 2017 . Certain amounts may be presented on a net basis on the Condensed Consolidated Financial Statements when such amounts are with the same counterparty and subject to a master netting arrangement (in millions): Fair Value at Description Location on Balance Sheet March 31, 2018 December 31, 2017 Asset Derivatives Crude oil and natural gas derivative contracts - Current portion Assets from Price Risk Management Activities $ 1 $ 8 Noncurrent portion Other Assets 7 — Liability Derivatives Crude oil and natural gas derivative contracts - Current portion Liabilities from Price Risk Management Activities (1) $ 84 $ 50 Noncurrent portion Other Liabilities — 7 (1) The current portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $117 million , partially offset by gross assets of $33 million at March 31, 2018, and gross liabilities of $55 million , partially offset by gross assets of $5 million at December 31, 2017.
Crude Oil [Member] | Midland Differential Basis Swaps [Member]
Derivatives, Fair Value [Line Items]
Schedule of Derivative Instruments	Presented below is a comprehensive summary of EOG's Midland Differential basis swap contracts for the three months ended March 31, 2018 . The weighted average price differential expressed in dollars per barrel ($/Bbl) represents the amount of reduction to Cushing, Oklahoma, prices for the notional volumes expressed in barrels per day (Bbld) covered by the basis swap contracts. Midland Differential Basis Swap Contracts Volume (Bbld) Weighted Average Price Differential ($/Bbl) 2018 January 1, 2018 through April 30, 2018 (closed) 15,000 $ 1.063 May 1, 2018 through December 31, 2018 15,000 1.063 2019 January 1, 2019 through December 31, 2019 20,000 $ 1.075
Crude Oil [Member] | Gulf Coast Differential Basis Swap [Member]
Derivatives, Fair Value [Line Items]
Schedule of Derivative Instruments	Presented below is a comprehensive summary of EOG's Gulf Coast Differential basis swap contracts for the three months ended March 31, 2018 . The weighted average price differential expressed in $/Bbl represents the amount of addition to Cushing, Oklahoma, prices for the notional volumes expressed in Bbld covered by the basis swap contracts. Gulf Coast Differential Basis Swap Contracts Volume (Bbld) Weighted Average Price Differential ($/Bbl) 2018 January 1, 2018 through April 30, 2018 (closed) 37,000 $ 3.818 May 1, 2018 through December 31, 2018 37,000 3.818
Crude Oil [Member] | Price Swaps [Member]
Derivatives, Fair Value [Line Items]
Schedule of Derivative Instruments	Presented below is a comprehensive summary of EOG's crude oil price swap contracts for the three months ended March 31, 2018 , with notional volumes expressed in Bbld and prices expressed in $/Bbl. Crude Oil Price Swap Contracts Volume (Bbld) Weighted Average Price ($/Bbl) 2018 January 1, 2018 through March 31, 2018 (closed) 134,000 $ 60.04 April 1, 2018 through December 31, 2018 134,000 60.04
Natural Gas [Member] | Price Swaps [Member]
Derivatives, Fair Value [Line Items]
Schedule of Derivative Instruments	Presented below is a comprehensive summary of EOG's natural gas price swap contracts for the three months ended March 31, 2018 , with notional volumes expressed in million British thermal units (MMBtu) per day (MMBtud) and prices expressed in dollars per MMBtu ($/MMBtu). Natural Gas Price Swap Contracts Volume (MMBtud) Weighted Average Price ($/MMBtu) 2018 March 1, 2018 through April 30, 2018 (closed) 35,000 $ 3.00 May 1, 2018 through November 30, 2018 35,000 3.00
Natural Gas [Member] | Options [Member]
Derivatives, Fair Value [Line Items]
Schedule of Derivative Instruments	Presented below is a comprehensive summary of EOG's natural gas call and put option contracts for the three months ended March 31, 2018 , with notional volumes expressed in MMBtud and prices expressed in $/MMBtu. Natural Gas Option Contracts Call Options Sold Put Options Purchased Volume (MMBtud) Weighted Volume (MMBtud) Weighted 2018 March 1, 2018 through April 30, 2018 (closed) 120,000 $ 3.38 96,000 $ 2.94 May 1, 2018 through November 30, 2018 120,000 3.38 96,000 2.94

Summary of Significant Accoun28

Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 01, 2018
Crude Oil and Condensate	$ 2,101,308	$ 1,430,061
Natural Gas Liquids	221,415	153,444
Natural Gas	299,766	230,602
Gathering, Processing and Marketing	1,101,822	726,537
Total	3,681,162	2,610,565
Gathering and Processing Costs	101,345
Marketing Costs	1,106,390	736,536
Total	2,806,574	2,502,819
Operating Income (Loss)	874,588	$ 107,746
Accounts Receivable From Contracts With Customers	1,428,000		$ 1,343,000
Amounts Without Adoption of ASU 2014-09 [Member]
Crude Oil and Condensate	2,101,308
Natural Gas Liquids	219,646
Natural Gas	256,620
Gathering, Processing and Marketing	1,096,236
Total	3,630,661
Gathering and Processing Costs	56,430
Marketing Costs	1,100,804
Total	2,756,073
Operating Income (Loss)	874,588
Effect of Change [Member]
Crude Oil and Condensate	0
Natural Gas Liquids	1,769
Natural Gas	43,146
Gathering, Processing and Marketing	5,586
Total	50,501
Gathering and Processing Costs	44,915
Marketing Costs	5,586
Total	50,501
Operating Income (Loss)	$ 0

Stock-Based Compensation (Detai

Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended
		Mar. 31, 2018		Mar. 31, 2017
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Total Operating Expenses		$ 2,806,574		$ 2,502,819
Compensation expense related to the company's stock-based compensation plans		35,500		30,500
Stock-based compensation expense related to stock options, SAR and ESPP grants		$ 12,000		$ 11,000
Common Shares Available for Grant		16,800,000
Stock Options and SARs [Member]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Unrecognized compensation expense		$ 88,200
Weighted average period over which unrecognized compensation expense will be recognized (in years)		1 year 8 months 12 days
Weighted Average Fair Values And Valuation Assumptions Used To Value Stock Option/SARs, ESPP, and Performance Units/Stock Stock-Based Compensation [Abstract]
Weighted Average Fair Value of Grants (price per share)		$ 28.19		$ 29.13
Expected Volatility (in hundredths)		29.01%		31.67%
Risk-Free Interest Rate (in hundredths)		2.09%		1.36%
Dividend Yield (in hundredths)		0.66%		0.67%
Expected Life (in years)		5 years		5 years 3 months 18 days
Stock Options and SARs Rollforward [Abstract]
Outstanding at January 1 (in shares)		9,103,000		9,850,000
Granted (in shares)		16,000		5,000
Exercised (1) (in shares)	[1]	(752,000)		(600,000)
Forfeited (in shares)		(77,000)		(99,000)
Outstanding at March 31 (2) (in shares)	[2]	8,290,000		9,156,000
Stock Options and SARs Vested or Expected to Vest (in shares)	[3]	7,940,000		8,849,000
Stock Options and SARs Exercisable at September 30 (in shares)	[4]	3,803,000		5,078,000
Intrinsic Value of Stock Options/SARs Exercised		$ 28,400		$ 26,600
Intrinsic Value of Stock Options/SARs Outstanding		$ 170,700		$ 199,300
Weighted Average Remaining Contractual Life for Stock Options/SARs Outstanding		4 years 3 months 18 days		3 years 9 months 18 days
Intrinsic Value of Stock Options/SARs Vested or Expected to Vest		$ 166,100		$ 196,000
Weighted average remaining contractual life for stock options/SARs vested or expected to vest (in years)al Term		4 years 2 months 12 days		3 years 9 months 18 days
Aggregate Intrinsic Value for Exercisable Units		$ 110,800		$ 155,500
Weighted average remaining contractual life for exercisable options/SARs (in years)		2 years 7 months 6 days		2 years 4 months 24 days
Weighted Average Grant Price Stock Option and SARs [Rollforward]
Outstanding at January 1 (price per share)		$ 83.89		$ 75.53
Granted (price per share)		106.76		101.61
Exercised (1) (price per share)	[1]	74.65		57.53
Forfeited (price per share)		91.94		88.57
Outstanding at March 31 (2) (price per share)	[2]	84.7		76.59
Vested or Expected to Vest (3) (price per share)	[3]	84.38		76.20
Exercisable at March 31 (4) (price per share)	[4]	76.16		67.74
ESPP [Member]
Weighted Average Fair Values And Valuation Assumptions Used To Value Stock Option/SARs, ESPP, and Performance Units/Stock Stock-Based Compensation [Abstract]
Weighted Average Fair Value of Grants (price per share)		$ 23.27		$ 24.28
Expected Volatility (in hundredths)		22.04%		30.33%
Risk-Free Interest Rate (in hundredths)		1.60%		0.65%
Dividend Yield (in hundredths)		0.66%		0.69%
Expected Life (in years)		6 months		6 months
Restricted Stock And Restricted Stock Units [Member]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Unrecognized compensation expense		$ 172,700
Weighted average period over which unrecognized compensation expense will be recognized (in years)		2 years 4 months 24 days
Intrinsic value released during the year		$ 28,400		$ 36,000
Aggregate intrinsic value of stock and units outstanding		403,500		382,600
Restricted Stock/Restricted Stock Units [Roll Forward]
Share-Based Compensation Arrangement By Restricted Stock And Restricted Stock Units Compensation Cost		$ 22,400		$ 18,600
Outstanding at January 1 (in shares)		3,905,000		3,962,000
Granted (in shares)		279,000		402,000
Released (1) (in shares)	[5]	(276,000)		(360,000)
Forfeited (in shares)		(75,000)		(82,000)
Outstanding at March 31 (2) (in shares)	[6]	3,833,000		3,922,000
Weighted Average Grant Price Restricted Stock and Restricted Stock Units [Roll Forward]
Outstanding at January 1 (price per share)		$ 88.57		$ 79.63
Granted (price per share)		102.27		99.52
Released (1) (price per share)	[5]	66.46		61.96
Forfeited (price per share)		90.65		82.83
Outstanding at March 31 (2) (price per share)	[6]	$ 91.12		$ 83.22
Performance Units and Performance Stock [Member]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Compensation expense related to the company's stock-based compensation plans		$ 1,100		$ 900
Unrecognized compensation expense		$ 7,200
Weighted average period over which unrecognized compensation expense will be recognized (in years)		1 year 9 months 18 days
Intrinsic value released during the year		$ 9,000
Aggregate intrinsic value of stock and units outstanding		$ 60,400		$ 56,100
Restricted Stock/Restricted Stock Units [Roll Forward]
Outstanding at January 1 (in shares)		502,331		545,290
Granted (in shares)		0		0
Granted for Performance Multiple (1)	[7]	71,805		118,834
Released (1) (in shares)		0		89,224	[8]
Forfeited (in shares)		0		0
Outstanding at March 31 (2) (in shares)	[9]	574,136	[10]	574,900
Weighted Average Grant Price Restricted Stock and Restricted Stock Units [Roll Forward]
Outstanding at January 1 (price per share)		$ 90.96		$ 80.92
Granted (price per share)		0		0
Granted for Performance Multiple (1) (in dollars per share)	[7]	101.87		84.43
Released (1) (price per share)	[8]	0		84.43
Forfeited (price per share)		0		0
Outstanding at March 31 (2) (price per share)	[9]	$ 92.33		$ 81.10
Performance Units and Performance Stock Disclosures [Abstract]
Performance Period for Performance Units and Shares		3 years
Minimum Performance Multiple at the Completion of the Performance Period		0.00%
Maximum Performance Multiple at the Completion of the Performance Period		200.00%
Minimum Performance Units and Stock Allowed to be Outstanding		292,054
Maximum Performance Units and Stock Allowed to be Outstanding		856,218
Lease And Well [Member]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Compensation expense related to the company's stock-based compensation plans		$ 12,800		$ 10,900
Gathering And Processing Costs [Member]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Compensation expense related to the company's stock-based compensation plans		100		200
Exploration Costs [Member]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Compensation expense related to the company's stock-based compensation plans		6,900		6,200
General And Administrative [Member]
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items]
Compensation expense related to the company's stock-based compensation plans		$ 15,700		$ 13,200
[1]	The total intrinsic value of stock options/SARs exercised for the three months ended March 31, 2018 and 2017 was $28.4 million and $26.6 million, respectively. The intrinsic value is based upon the difference between the market price of EOG's common stock on the date of exercise and the grant price of the stock options/SARs.
[2]	The total intrinsic value of stock options/SARs outstanding at March 31, 2018 and 2017 was $170.7 million and $199.3 million, respectively. At March 31, 2018 and 2017, the weighted average remaining contractual life was 4.3 years and 3.8 years, respectively.
[3]	The total intrinsic value of stock options/SARs vested or expected to vest at March 31, 2018 and 2017 was $166.1 million and $196.0 million, respectively. At March 31, 2018 and 2017, the weighted average remaining contractual life was 4.2 years and 3.8 years, respectively.
[4]	The total intrinsic value of stock options/SARs exercisable at March 31, 2018 and 2017 was $110.8 million and $155.5 million, respectively. At March 31, 2018 and 2017, the weighted average remaining contractual life was 2.6 years and 2.4 years, respectively.
[5]	The total intrinsic value of restricted stock and restricted stock units released for the three months ended March 31, 2018 and 2017 was $28.4 million and $36.0 million, respectively. The intrinsic value is based upon the closing price of EOG's common stock on the date the restricted stock and restricted stock units are released.
[6]	The total intrinsic value of restricted stock and restricted stock units outstanding at March 31, 2018 and 2017 was $403.5 million and $382.6 million, respectively.
[7]	Upon completion of the Performance Period for the Performance Awards granted in 2014 and 2013, a performance multiple of 200% was applied to each of the grants resulting in additional grants of Performance Awards in February 2018 and February 2017, respectively.
[8]	The total intrinsic value of Performance Awards released during the three months ended March 31, 2017 was approximately $9 million.
[9]	The total intrinsic value of Performance Awards outstanding at March 31, 2018 and 2017 was approximately $60.4 million and $56.1 million, respectively.
[10]	Upon the application of the relevant performance multiple at the completion of each of the remaining Performance Periods, a minimum of 292,054 and a maximum of 856,218 Performance Awards could be outstanding. The intrinsic value is based upon the closing price of EOG's common stock on the date Performance Awards are released.

Net Income Per Share (Details)

Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Numerator for Basic and Diluted Earnings Per Share - [Abstract]
Net Income	$ 638,589	$ 28,517
Denominator for Basic Earnings Per Share - [Abstract]
Weighted Average Shares	575,775	573,935
Denominator for Diluted Earnings Per Share - [Abstract]
Adjusted Diluted Weighted Average Shares	579,726	578,593
Antidilutive Securities Excluded from Computation of Earnings Per Share [Abstract]
Anti-dilutive Securities excluded from Diluted Earnings Per Share Calculation	200	2,000
Net Income Per Share
Basic	$ 1.11	$ 0.05
Diluted	$ 1.10	$ 0.05
Stock Options And SARs [Member]
Potential Dilutive Common Shares - [Abstract]
Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangments	1,217	1,871
Restricted Stock/Units and Performance Units/Stock [Member]
Potential Dilutive Common Shares - [Abstract]
Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangments	2,734	2,787

Supplemental Cash Flow Inform31

Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Supplemental Cash Flow Information [Abstract]
Interest (1)	[1]	$ 50,103	$ 77,828
Income Taxes, Net of Refunds Received		3,554	81,960
Interest Costs Capitalized		5,000	7,000
Accrued Capital Expenditures		593,000	$ 415,000
Non-Cash Property Exchanges		9,000
Non-Cash Other Property, Plant and Equipment		$ 48,000
[1]	Net of capitalized interest of $5 million and $7 million for the three months ended March 31, 2018 and 2017, respectively.

Segment Information (Details)

Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other		$ 3,681,162	$ 2,610,565
Operating Income (Loss)		874,588	107,746
Other Income, Net		727	3,151
Interest Expense, Net		61,956	71,515
Income Before Income Taxes		813,359	39,382
Total Assets		30,740,517		$ 29,833,078
United States [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other		3,571,134	2,519,849
Operating Income (Loss)		845,853	119,531
Total Assets		29,780,881		28,312,599
Trinidad [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other		81,013	73,923
Operating Income (Loss)		40,297	16,413
Total Assets		610,376		974,477
Other International [Member]
Schedule of Segment Reporting Information By Segment [Abstract]
Operating Revenues and Other	[1]	29,015	16,793
Operating Income (Loss)	[1]	(11,562)	$ (28,198)
Total Assets	[1]	$ 349,260		$ 546,002
[1]	Other International primarily consists of EOG's United Kingdom, China and Canada operations.

Asset Retirement Obligations (D

Asset Retirement Obligations (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Asset Retirement Obligation [Abstract]
Carrying Amount at January 1		$ 946,848	$ 912,926
Liabilities Incurred		10,279	7,418
Liabilities Settled (1)	[1]	50	(11,197)
Accretion		8,868	8,525
Revisions		(291)	3,646
Foreign Currency Translations		245	837
Carrying Amount at March 31		965,999	922,155
Current Portion		19,177	19,450
Noncurrent Portion		$ 946,822	$ 902,705
[1]	Includes settlements related to asset sales.

Exploratory Well Costs (Details

Exploratory Well Costs (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)
Capitalized Exploratory Well Costs that are Pending Determination of Proved Reserves [Roll Forward]
Balance at January 1	$ 2,167
Additions Pending the Determination of Proved Reserves	1,102
Reclassifications to Proved Properties	(509)
Costs Charged to Expense	0
Balance at March 31	$ 2,760

Pension and Postretirement Be35

Pension and Postretirement Benefits (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Defined Benefit and Defined Contribution Plan Disclosure [Line Items]
Total Pension Plans Costs	$ 9.9	$ 10

Long-Term Debt (Details)

Long-Term Debt (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Borrowings Outstanding	$ 0		$ 0
Average Outstanding Amount	$ 18,000,000	$ 0
Weighted average interest rate (in hundredths)	1.76%
Uncommitted Credit Facility [Member]
Line of Credit Facility [Line Items]
Borrowings Outstanding	$ 0		0
Revolving Credit Agreement 2020 [Member]
Line of Credit Facility [Line Items]
Borrowings Outstanding	0		$ 0
Line of Credit Facility, Maximum Borrowing Capacity	$ 2,000,000,000
Line of Credit Facility, Expiration Date	Jul. 21, 2020
Eurodollar [Member]
Line of Credit Facility [Line Items]
Weighted average interest rate (in hundredths)	2.88%
Base Rate [Member]
Line of Credit Facility [Line Items]
Weighted average interest rate (in hundredths)	4.75%

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Proved Oil and Gas Properties, Other Property, Plant and Equipment and Other Assets [Abstract]
Proved Oil and Gas Properties and Other Assets Carrying Amount	$ 151
Proved Oil and Gas Properties and Other Assets Written Down During the Period - Fair value at End of Period	129
Pretax Impairment Charges for Proved Oil and Gas Properties and Other Assets	22
Pretax Impairment Charge for a Commodity Price-Related Write-Down of Other Assets	21
Debt Disclosure [Abstract]
Aggregate Principal Amount of Current and Long-Term Debt	6,390	$ 6,390
Estimated Fair Value of Debt	6,470	6,602
Commodity Contract [Member] | Crude Oil [Member] | Price Swaps [Member]
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	117	38
Commodity Contract [Member] | Crude Oil [Member] | Price Swaps [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Commodity Contract [Member] | Crude Oil [Member] | Price Swaps [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure		38
Commodity Contract [Member] | Crude Oil [Member] | Price Swaps [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0	0
Commodity Contract [Member] | Crude Oil [Member] | Basis Swaps [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	35
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure		19
Commodity Contract [Member] | Crude Oil [Member] | Basis Swaps [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure		0
Commodity Contract [Member] | Crude Oil [Member] | Basis Swaps [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	35	2
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure	117	19
Commodity Contract [Member] | Crude Oil [Member] | Basis Swaps [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	0
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure		0
Commodity Contract [Member] | Natural Gas [Member] | Price Swaps [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	2
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure		2
Commodity Contract [Member] | Natural Gas [Member] | Price Swaps [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	0	0
Commodity Contract [Member] | Natural Gas [Member] | Price Swaps [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	2
Commodity Contract [Member] | Natural Gas [Member] | Price Swaps [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	0	0
Commodity Contract [Member] | Natural Gas [Member] | Commodity Option [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	4
Commodity Contract [Member] | Natural Gas [Member] | Commodity Option [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	0
Commodity Contract [Member] | Natural Gas [Member] | Commodity Option [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	4
Commodity Contract [Member] | Natural Gas [Member] | Commodity Option [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure	$ 0
Commodity Contract [Member] | Natural Gas [Member] | Options/Collars [Member]
Financial Liabilities:
Financial and Nonfinancial Liabilities, Fair Value Disclosure		6
Commodity Contract [Member] | Natural Gas [Member] | Options/Collars [Member] | Fair Value, Inputs, Level 1 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure		0
Commodity Contract [Member] | Natural Gas [Member] | Options/Collars [Member] | Fair Value, Inputs, Level 2 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure		6
Commodity Contract [Member] | Natural Gas [Member] | Options/Collars [Member] | Fair Value, Inputs, Level 3 [Member]
Financial Assets: [Abstract]
Assets, Fair Value Disclosure		$ 0

Risk Management Activities (Det

Risk Management Activities (Details)		3 Months Ended
		Mar. 31, 2018USD ($)MMBTU$ / bbl$ / MMBTUbbl	Dec. 31, 2017USD ($)
Derivatives, Fair Value [Line Items]
Assets from Price Risk Management Activities		$ 761,000	$ 7,699,000
Liabilities from Price Risk Management Activities		84,128,000	50,429,000
Derivative Collateral [Abstract]
Collateral Had on Derivative		0	0
Collateral Held on Derivative		0	0
Other Assets [Member] | Price Risk Derivative [Member]
Derivatives, Fair Value [Line Items]
Other Assets		7,000,000	0
Liabilities From Price Risk Management Activities [Member]
Derivatives, Fair Value [Line Items]
Assets from Price Risk Management Activities		33,000,000	5,000,000
Liabilities from Price Risk Management Activities		117,000,000	55,000,000
Liabilities From Price Risk Management Activities [Member] | Price Risk Derivative [Member]
Derivatives, Fair Value [Line Items]
Liabilities from Price Risk Management Activities	[1]	84,000,000	50,000,000
Other Liabilities [Member] | Price Risk Derivative [Member]
Derivatives, Fair Value [Line Items]
Other Liabilities		0	7,000,000
Assets From Price Risk Management Activities [Member] | Price Risk Derivative [Member]
Derivatives, Fair Value [Line Items]
Assets from Price Risk Management Activities		$ 1,000,000	$ 8,000,000
Crude Oil [Member] | Midland Differential Basis Swaps [Member] | Derivative Contracts - January through April (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		15,000
Derivative, Swap Type, Average Fixed Price | $ / bbl		1.063
Crude Oil [Member] | Midland Differential Basis Swaps [Member] | Derivative Contracts - May through December [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		15,000
Derivative, Swap Type, Average Fixed Price | $ / bbl		1.063
Crude Oil [Member] | Midland Differential Basis Swaps [Member] | Derivative Contracts Year Two - January through December [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		20,000
Derivative, Swap Type, Average Fixed Price | $ / bbl		1.075
Crude Oil [Member] | Gulf Coast Differential Basis Swap [Member] | Derivative Contracts - January through April (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		37,000
Derivative, Swap Type, Average Fixed Price | $ / bbl		3.818
Crude Oil [Member] | Gulf Coast Differential Basis Swap [Member] | Derivative Contracts - May through December [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		37,000
Derivative, Swap Type, Average Fixed Price | $ / bbl		3.818
Crude Oil [Member] | Price Swaps [Member] | Derivative Contracts - January through March (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		134,000
Derivative, Swap Type, Average Fixed Price | $ / bbl		60.04
Crude Oil [Member] | Price Swaps [Member] | Derivative Contracts - April through December [Member]
Derivatives, Fair Value [Line Items]
Volume (Bbld) | bbl		134,000
Derivative, Swap Type, Average Fixed Price | $ / bbl		60.04
Natural Gas [Member] | Price Swaps [Member] | Derivative Contracts - March through April (closed) [Member]
Derivatives, Fair Value [Line Items]
Derivative, Swap Type, Average Fixed Price | $ / MMBTU		3
Volume (MMBtud) | MMBTU		35,000
Natural Gas [Member] | Price Swaps [Member] | Derivative Contracts - May through November [Member]
Derivatives, Fair Value [Line Items]
Derivative, Swap Type, Average Fixed Price | $ / MMBTU		3
Volume (MMBtud) | MMBTU		35,000
Natural Gas [Member] | Call Option [Member] | Derivative Contracts - March through April (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) | MMBTU		120,000
Derivative, Average Price Risk Option Strike Price | $ / MMBTU		3.38
Natural Gas [Member] | Call Option [Member] | Derivative Contracts - May through November [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) | MMBTU		120,000
Derivative, Average Price Risk Option Strike Price | $ / MMBTU		3.38
Natural Gas [Member] | Put Option [Member] | Derivative Contracts - March through April (closed) [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) | MMBTU		96,000
Derivative, Average Price Risk Option Strike Price | $ / MMBTU		2.94
Natural Gas [Member] | Put Option [Member] | Derivative Contracts - May through November [Member]
Derivatives, Fair Value [Line Items]
Volume (MMBtud) | MMBTU		96,000
Derivative, Average Price Risk Option Strike Price | $ / MMBTU		2.94
[1]	The current portion of Liabilities from Price Risk Management Activities consists of gross liabilities of $117 million, partially offset by gross assets of $33 million at March 31, 2018, and gross liabilities of $55 million, partially offset by gross assets of $5 million at December 31, 2017.

Acquisitions and Divestitures39

Acquisitions and Divestitures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Discontinued Operations and Disposal Groups [Abstract]
Losses on Asset Dispositions, Net	$ (14,969)	$ (16,758)
Proceeds from Sale of Oil and Gas Property and Equipment	$ 2,829	$ 46,812