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Employee Benefit Plans (Details) |  | 12 Months Ended |
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Feb. 27, 2020 shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Feb. 19, 2020 USD ($)
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items] |  |  |  |  |  |  |  |
Subsidiary guarantees demand for payment | $ |  |  |  |  |  |  |  | $ 0
Common Shares Available for Grant |  |  | 6,800,000 |  |  |  |  |
Share-based Payment Arrangement, Expense, Tax Benefit | $ |  |  | $ (1,000,000) |  | $ 20,000,000 |  | $ 32,000,000 |
Compensation expense related to the company's stock-based compensation plans | $ |  |  | $ 174,738,000 |  | 155,337,000 |  | 133,849,000 |
Stock Options and Sars [Member] |  |  |  |  |  |  |  |
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items] |  |  |  |  |  |  |  |
Maximum term of stock options and SARs granted |  |  | 7 years |  |  |  |  |
Share-based Compensation Expense Related To Stock Options, SAR and ESPP Grants | $ |  |  | $ 63,000,000 |  | 60,000,000 |  | 56,000,000 |
Stock Options/SARs Vested or Expected to Vest (in shares) |  |  | 9,100,000 |  |  |  |  |
Weighted average grant price for stock options/SARs vested or expected to vest (per share) | $ / shares |  |  | $ 94.52 |  |  |  |  |
Intrinsic value of stock options/SARs vested or expected to vest | $ |  |  | $ 29,100,000 |  |  |  |  |
Weighted Average Remaining Contractual Life for Stock Options/SARs Vested or Expected to Vest |  |  | 4 years 2 months 12 days |  |  |  |  |
Unrecognized compensation expense | $ |  |  | $ 86,000,000 |  |  |  |  |
Weighted average period over which unrecognized compensation expense will be recognized |  |  | 2 years |  |  |  |  |
Intrinsic Value Of Stock Options/SARs Exercised During The Period | $ |  |  | $ 14,000,000 |  | $ 118,000,000 |  | $ 95,000,000 |
Weighted Average Fair Value And Valuation Assumptions Used To Value Stock Options/SARs, ESPP, and Performance Units/Stock-Based Compensation [Abstract] |  |  |  |  |  |  |  |
Weighted Average Fair Value of Grants (price per share) | $ / shares |  |  | $ 19.49 |  | $ 33.46 |  | $ 23.95 |
Expected Volatility (in hundredths) |  |  | 32.02% |  | 28.23% |  | 28.28% |
Risk-Free Interest Rate (in hundredths) |  |  | 1.69% |  | 2.68% |  | 1.52% |
Dividend Yield (in hundredths) |  |  | 1.39% |  | 0.72% |  | 0.75% |
Expected Life (in years) |  |  | 5 years 1 month 6 days |  | 5 years |  | 5 years 1 month 6 days |
Stock Options and SARs Rollforward [Abstract] |  |  |  |  |  |  |  |
Outstanding at January 1 (in shares) |  |  | 8,310,000 |  | 9,103,000 |  | 9,850,000 |
Granted (in shares) |  |  | 1,965,000 |  | 1,906,000 |  | 2,274,000 |
Exercised (1) (in shares) | [1] |  | (606,000) |  | (2,493,000) |  | (2,574,000) |
Forfeited (in shares) |  |  | (274,000) |  | (206,000) |  | (447,000) |
Outstanding at December 31 (in shares) |  |  | 9,395,000 |  | 8,310,000 |  | 9,103,000 |
Stock Options/SARs Exercisable at December 31 (in shares) |  |  | 5,275,000 |  | 3,969,000 |  | 4,510,000 |
Weighted Average Grant Price Stock Option and SARs [Rollfoward] |  |  |  |  |  |  |  |
Outstanding at January 1 (in dollars per share) | $ / shares |  |  | $ 96.90 |  | $ 83.89 |  | $ 75.53 |
Granted (in dollars per share) | $ / shares |  |  | 75.39 |  | 126.49 |  | 96.27 |
Exercised (in dollars per share) | $ / shares | [1] |  | 61.43 |  | 72.21 |  | 61.12 |
Forfeited (in dollars per share) | $ / shares |  |  | 102.57 |  | 94.43 |  | 93.84 |
Outstanding at December 31 (in dollars per share) | $ / shares |  |  | 94.53 |  | 96.90 |  | 83.89 |
Stock Options/SARs Exercisable at December 31 (in dollars per share) | $ / shares |  |  | $ 94.21 |  | 85.82 |  | 75.76 |
Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items] |  |  |  |  |  |  |  |
Stock Options and SARs Outstanding |  |  | 9,395,000 |  |  |  |  |
Weighted Average Remaining Life for Outstanding Options and SARs |  |  | 4 years |  |  |  |  |
Weighted Average Grant Price For Outstanding Options and SARs | $ / shares |  |  | $ 94.53 |  |  |  |  |
Aggregate Intrinsic Value For Outstanding Options and SARs | $ | [2] |  | $ 30,534 |  |  |  |  |
Stock Options and SARs Exercisable |  |  | 5,275,000 |  |  |  |  |
Weighted Average Remaining Life For Exercisable Units |  |  | 3 years |  |  |  |  |
Weighted Average Grant Price For Exercisable Options and SARs | $ / shares |  |  | $ 94.21 |  |  |  |  |
Aggregate Intrinsic Value For Exercisable Units | $ | [2] |  | $ 13,839 |  |  |  |  |
Stock Options and Sars [Member] | Vesting Schedule - First Anniversary [Member] |  |  |  |  |  |  |  |
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items] |  |  |  |  |  |  |  |
Vesting Period Increments (in hundredths) |  |  | 33.00% |  |  |  |  |
Stock Options and Sars [Member] | Vesting Schedule - Second Anniversary [Member] |  |  |  |  |  |  |  |
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items] |  |  |  |  |  |  |  |
Vesting Period Increments (in hundredths) |  |  | 33.00% |  |  |  |  |
Stock Options and Sars [Member] | Vesting Schedule - Third Anniversary [Member] |  |  |  |  |  |  |  |
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items] |  |  |  |  |  |  |  |
Vesting Period Increments (in hundredths) |  |  | 34.00% |  |  |  |  |
ESPP [Member] |  |  |  |  |  |  |  |
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items] |  |  |  |  |  |  |  |
Common Shares Available for Grant |  |  | 2,300,000 |  |  |  |  |
Percentage of fair market value at which employees may purchase company stock via the ESPP |  |  | 85.00% |  |  |  |  |
Maximum Percentage Of Employee Pay Eligible For Contribution To ESPP Percentage |  |  | 10.00% |  |  |  |  |
Weighted Average Fair Value And Valuation Assumptions Used To Value Stock Options/SARs, ESPP, and Performance Units/Stock-Based Compensation [Abstract] |  |  |  |  |  |  |  |
Weighted Average Fair Value of Grants (price per share) | $ / shares |  |  | $ 22.83 |  | $ 25.75 |  | $ 22.20 |
Expected Volatility (in hundredths) |  |  | 34.78% |  | 24.59% |  | 27.12% |
Risk-Free Interest Rate (in hundredths) |  |  | 2.27% |  | 1.89% |  | 0.88% |
Dividend Yield (in hundredths) |  |  | 1.04% |  | 0.64% |  | 0.71% |
Expected Life (in years) |  |  | 15 days |  | 15 days |  | 15 days |
Stock Options and SARs Rollforward [Abstract] |  |  |  |  |  |  |  |
Approximate Number of Participants |  |  | 1,998 |  | 1,934 |  | 1,870 |
Shares Purchased |  |  | 224,000 |  | 180,000 |  | 180,000 |
Aggregate Purchase Price | $ |  |  | $ 16,533,000 |  | $ 14,887,000 |  | $ 13,997,000 |
Restricted Stock and Restricted Stock Units [Member] |  |  |  |  |  |  |  |
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items] |  |  |  |  |  |  |  |
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation | $ |  |  | 97,000,000 |  | 81,000,000 |  | 68,000,000 |
Unrecognized compensation expense | $ |  |  | $ 202,000,000 |  |  |  |  |
Weighted average period over which unrecognized compensation expense will be recognized |  |  | 1 year 9 months 18 days |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period |  |  | 3 years |  |  |  |  |
Intrinsic value released during the year | $ |  |  | $ 70,000,000 |  | 84,000,000 |  | 91,000,000 |
Aggregate intrinsic value of stock and unit outstanding | $ |  |  | $ 381,000,000 |  | $ 331,000,000 |  | $ 421,000,000 |
Number of Shares and Units [Roll Forward] |  |  |  |  |  |  |  |
Outstanding at January 1 (in shares) |  |  | 3,792,000 | [3] | 3,905,000 | [3] | 3,962,000 |
Granted (in shares) |  |  | 1,749,000 |  | 812,000 |  | 1,095,000 |
Released (in shares) | [4] |  | (855,000) |  | (740,000) |  | (929,000) |
Forfeited (in shares) |  |  | (140,000) |  | (185,000) |  | (223,000) |
Outstanding at December 31 (in shares) | [3] |  | 4,546,000 |  | 3,792,000 |  | 3,905,000 |
Weighted Average Grant Fair Value [Abstract] |  |  |  |  |  |  |  |
Outstanding at January 1 (in dollars per share) | $ / shares |  |  | $ 96.64 | [3] | $ 88.57 | [3] | $ 79.63 |
Granted (in dollars per share) | $ / shares |  |  | 80.01 |  | 117.55 |  | 97.34 |
Released (in dollars per share) | $ / shares | [4] |  | 96.93 |  | 78.16 |  | 61.51 |
Forfeited (in dollars per share) | $ / shares |  |  | 97.54 |  | 92.12 |  | 85.45 |
Outstanding at December 31 (in dollars per share) | $ / shares | [3] |  | $ 90.16 |  | $ 96.64 |  | $ 88.57 |
Performance Units [Member] |  |  |  |  |  |  |  |
Stock Options/SARs and Employee Stock Purchase Plan (ESPP) Disclosures [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation expense | $ |  |  | $ 9,000,000 |  |  |  |  |
Weighted average period over which unrecognized compensation expense will be recognized |  |  | 2 years |  |  |  |  |
Cliff Vesting Period |  |  | 41 months |  |  |  |  |
Compensation expense related to the company's stock-based compensation plans | $ |  |  | $ 15,000,000 |  | $ 14,000,000 |  | $ 10,000,000 |
Intrinsic value released during the year | $ |  |  | 15,000,000 |  | 18,000,000 |  | 24,000,000 |
Aggregate intrinsic value of stock and unit outstanding | $ |  |  | $ 50,000,000 |  | $ 47,000,000 |  | $ 54,000,000 |
Weighted Average Fair Value And Valuation Assumptions Used To Value Stock Options/SARs, ESPP, and Performance Units/Stock-Based Compensation [Abstract] |  |  |  |  |  |  |  |
Weighted Average Fair Value of Grants (price per share) | $ / shares |  |  | $ 79.98 |  | $ 136.74 |  | $ 113.81 |
Expected Volatility (in hundredths) |  |  | 29.20% |  | 29.92% |  | 32.19% |
Risk-Free Interest Rate (in hundredths) |  |  | 1.51% |  | 2.85% |  | 1.60% |
Number of Shares and Units [Roll Forward] |  |  |  |  |  |  |  |
Outstanding at January 1 (in shares) |  |  | 539,000 | [5] | 502,000 | [5] | 545,000 |
Granted (in shares) |  |  | 172,000 |  | 113,000 |  | 78,000 |
Granted for Performance Multiple (1) (in shares) | [6] |  | 72,000 |  | 72,000 |  | 119,000 |
Released (in shares) | [7] |  | (185,000) |  | (148,000) |  | (240,000) |
Forfeited (in shares) |  |  | 0 |  | 0 |  | 0 |
Outstanding at December 31 (in shares) | [5] |  | 598,000 | [8] | 539,000 |  | 502,000 |
Weighted Average Grant Fair Value [Abstract] |  |  |  |  |  |  |  |
Outstanding at January 1 (in dollars per share) | $ / shares |  |  | $ 101.53 | [5] | $ 90.96 | [5] | $ 80.92 |
Granted (in dollars per share) | $ / shares |  |  | 75.09 |  | 125.73 |  | 96.29 |
Granted for Performance Multiple (1) (in dollars per share) | $ / shares | [6] |  | 69.43 |  | 101.87 |  | 84.43 |
Released (in dollars per share) | $ / shares | [7] |  | 94.63 |  | 84.43 |  | 66.69 |
Forfeited (in dollars per share) | $ / shares |  |  | 0 |  | 0 |  | 0 |
Outstanding at December 31 (in dollars per share) | $ / shares | [5] |  | $ 92.19 |  | $ 101.53 |  | $ 90.96 |
Performance Units and Performance Stock [Abstract] |  |  |  |  |  |  |  |
Minimum Performance Multiple at the Completion Performance Period |  |  | 0.00% |  |  |  |  |
Maximum Performance Multiple at the Completion Performance Period |  |  | 200.00% |  |  |  |  |
Minimum Performance Units and Stock Allowed to be Outstanding |  |  | 102 |  |  |  |  |
Maximum Performance Units and Stock Allowed to be Outstanding |  |  | 1,094 |  |  |  |  |
Performance Multiple Applied at the Completion Period |  | 150.00% | 200.00% |  | 200.00% |  | 200.00% |
Additional Performance Awards Granted |  | 65,872 |  |  |  |  |  |
Pension Plans [Member] |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |  |
Total pension plan costs | $ |  |  | $ 51,000,000 |  | $ 43,000,000 |  | $ 37,000,000 |
Company contributions to foreign pension plans | $ |  |  | 1,000,000 |  | 1,000,000 |  | 1,000,000 |
Defined Benefit Plan, Benefit Obligation | $ |  |  | 12,000,000 |  | 11,000,000 |  |  |
Fair value of foreign pension plan assets | $ |  |  | 10,000,000 |  | 9,000,000 |  |  |
Accrued benefit cost | $ |  |  | (100,000) |  | (200,000) |  |  |
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 | $ |  |  | 56,000,000 |  | 51,000,000 |  | 41,000,000 |
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 | $ |  |  | 1,000,000 |  | 1,000,000 |  | 1,000,000 |
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 | $ |  |  | 26,000,000 |  | 25,000,000 |  | 23,000,000 |
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 | $ |  |  | $ 92,000,000 |  | $ 78,000,000 |  | $ 69,000,000 |
$ 59.00 to $ 74.99 | Stock Options and Sars [Member] |  |  |  |  |  |  |  |
Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items] |  |  |  |  |  |  |  |
Stock Options and SARs Outstanding |  |  | 979,000 |  |  |  |  |
Weighted Average Remaining Life for Outstanding Options and SARs |  |  | 3 years |  |  |  |  |
Weighted Average Grant Price For Outstanding Options and SARs | $ / shares |  |  | $ 69.43 |  |  |  |  |
Stock Options and SARs Exercisable |  |  | 953,000 |  |  |  |  |
Weighted Average Remaining Life For Exercisable Units |  |  | 3 years |  |  |  |  |
Weighted Average Grant Price For Exercisable Options and SARs | $ / shares |  |  | $ 69.37 |  |  |  |  |
75.00 to 75.99 | Stock Options and Sars [Member] |  |  |  |  |  |  |  |
Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items] |  |  |  |  |  |  |  |
Stock Options and SARs Outstanding |  |  | 1,894,000 |  |  |  |  |
Weighted Average Remaining Life for Outstanding Options and SARs |  |  | 7 years |  |  |  |  |
Weighted Average Grant Price For Outstanding Options and SARs | $ / shares |  |  | $ 75.09 |  |  |  |  |
Stock Options and SARs Exercisable |  |  | 8,000 |  |  |  |  |
Weighted Average Remaining Life For Exercisable Units |  |  | 1 year |  |  |  |  |
Weighted Average Grant Price For Exercisable Options and SARs | $ / shares |  |  | $ 75.09 |  |  |  |  |
76.00 to 95.99 | Stock Options and Sars [Member] |  |  |  |  |  |  |  |
Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items] |  |  |  |  |  |  |  |
Stock Options and SARs Outstanding |  |  | 1,979,000 |  |  |  |  |
Weighted Average Remaining Life for Outstanding Options and SARs |  |  | 3 years |  |  |  |  |
Weighted Average Grant Price For Outstanding Options and SARs | $ / shares |  |  | $ 91.35 |  |  |  |  |
Stock Options and SARs Exercisable |  |  | 1,607,000 |  |  |  |  |
Weighted Average Remaining Life For Exercisable Units |  |  | 2 years |  |  |  |  |
Weighted Average Grant Price For Exercisable Options and SARs | $ / shares |  |  | $ 90.67 |  |  |  |  |
96.00 to 96.99 | Stock Options and Sars [Member] |  |  |  |  |  |  |  |
Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items] |  |  |  |  |  |  |  |
Stock Options and SARs Outstanding |  |  | 1,871,000 |  |  |  |  |
Weighted Average Remaining Life for Outstanding Options and SARs |  |  | 4 years |  |  |  |  |
Weighted Average Grant Price For Outstanding Options and SARs | $ / shares |  |  | $ 96.29 |  |  |  |  |
Stock Options and SARs Exercisable |  |  | 1,234,000 |  |  |  |  |
Weighted Average Remaining Life For Exercisable Units |  |  | 4 years |  |  |  |  |
Weighted Average Grant Price For Exercisable Options and SARs | $ / shares |  |  | $ 96.29 |  |  |  |  |
97.00 to 125.99 | Stock Options and Sars [Member] |  |  |  |  |  |  |  |
Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items] |  |  |  |  |  |  |  |
Stock Options and SARs Outstanding |  |  | 923,000 |  |  |  |  |
Weighted Average Remaining Life for Outstanding Options and SARs |  |  | 2 years |  |  |  |  |
Weighted Average Grant Price For Outstanding Options and SARs | $ / shares |  |  | $ 102.72 |  |  |  |  |
Stock Options and SARs Exercisable |  |  | 862,000 |  |  |  |  |
Weighted Average Remaining Life For Exercisable Units |  |  | 2 years |  |  |  |  |
Weighted Average Grant Price For Exercisable Options and SARs | $ / shares |  |  | $ 102.20 |  |  |  |  |
126.00 to 129.99 | Stock Options and Sars [Member] |  |  |  |  |  |  |  |
Summary Information By Grant Price Range For Stock Options And SARs Outstanding And Exercisable At End Of Period [Line Items] |  |  |  |  |  |  |  |
Stock Options and SARs Outstanding |  |  | 1,749,000 |  |  |  |  |
Weighted Average Remaining Life for Outstanding Options and SARs |  |  | 6 years |  |  |  |  |
Weighted Average Grant Price For Outstanding Options and SARs | $ / shares |  |  | $ 127.01 |  |  |  |  |
Stock Options and SARs Exercisable |  |  | 611,000 |  |  |  |  |
Weighted Average Remaining Life For Exercisable Units |  |  | 5 years |  |  |  |  |
Weighted Average Grant Price For Exercisable Options and SARs | $ / shares |  |  | $ 127.01 |  |  |  |  |
[1] | The total intrinsic value of stock options/SARs exercised during the years 2019, 2018 and 2017 was $14 million, $118 million and $95 million, respectively. The intrinsic value is based upon the difference between the market price of the Common Stock on the date of exercise and the grant price of the stock options/SARs.
[2] | Based upon the difference between the closing market price of the Common Stock on the last trading day of the year and the grant price of in-the-money stock options and SARs.
[3] | The total intrinsic value of restricted stock and restricted stock units outstanding at December 31, 2019, 2018 and 2017 was $381 million, $331 million and $421 million, respectively.
[4] | The total intrinsic value of restricted stock and restricted stock units released during the years ended December 31, 2019, 2018 and 2017 was $70 million, $84 million and $91 million, respectively. The intrinsic value is based upon the closing price of EOG's common stock on the date restricted stock and restricted stock units are released.
[5] | The total intrinsic value of Performance Awards outstanding at December 31, 2019, 2018 and 2017 was $50 million, $47 million and $54 million, respectively. The intrinsic value is based on the closing market price of the Common Stock on the last trading day of the year.
[6] | Upon completion of the Performance Period for the Performance Awards granted in 2015, 2014 and 2013, a performance multiple of 200% was applied to each of the grants resulting in additional grants of Performance Awards in February 2019, 2018 and 2017.
[7] | The total intrinsic value of Performance Awards released during the years ended December 31, 2019, 2018 and 2017 was $15 million, $18 million and $24 million, respectively. The intrinsic value is based upon the closing price of EOG's common stock on the date Performance Awards are released.
[8] | Upon the application of the relevant performance multiple at the completion of each of the remaining Performance Periods, a minimum of 102 and a maximum of 1,094 Performance Awards could be outstanding.

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