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Business Segment Information (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Operating Revenues and Other |  |  | $ 18,642 |  | $ 11,032 |  | $ 17,380 |
Depreciation, Depletion and Amortization |  |  | 3,651 |  | 3,400 |  | 3,750 |
Operating Income (Loss) |  |  | 6,102 |  | (544) |  | 3,699 |
Interest Income |  |  | 3 |  | 12 |  | 26 |
Other Income (Expense) |  |  | 6 |  | (2) |  | 5 |
Net Interest Expense (Income) |  |  | 178 |  | 205 |  | 185 |
Income (Loss) Before Income Taxes |  |  | 5,933 |  | (739) |  | 3,545 |
Income Tax Provision (Benefit) |  |  | 1,269 |  | (134) |  | 810 |
Additions to Oil and Gas Properties, Excluding Dry Hole Costs |  |  | 3,617 |  | 3,443 |  | 6,274 |
Total Property, Plant and Equipment, Net |  |  | 28,426 |  | 28,599 |  | 30,364 |
Total Assets |  |  | 38,236 |  | 35,805 |  | 37,125 |
Dry Hole Costs | [1] |  | 71 |  | 13 |  | 28 |
Crude Oil and Condensate |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | 11,125 |  | 5,786 |  | 9,613 |
Natural Gas Liquids |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | 1,812 |  | 668 |  | 785 |
Natural Gas |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | 2,444 |  | 837 |  | 1,184 |
Gains (Losses) on Mark-to-Market Commodity Derivative Contracts |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | (1,152) |  | 1,145 |  | 180 |
Gathering, Processing and Marketing |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | 4,288 |  | 2,583 |  | 5,360 |
Gains (Losses) on Asset Dispositions, Net |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | 17 |  | (47) |  | 124 |
Other, Net |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | 108 |  | 60 |  | 134 |
United States |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Operating Revenues and Other |  |  | 18,265 | [2] | 10,795 | [3] | 17,052 | [4]
Depreciation, Depletion and Amortization |  |  | 3,558 |  | 3,324 |  | 3,652 |
Operating Income (Loss) |  |  | 6,013 |  | (546) | [5] | 3,619 |
Interest Income |  |  | 3 |  | 11 |  | 22 |
Other Income (Expense) |  |  | (14) |  | 0 |  | 3 |
Net Interest Expense (Income) |  |  | 178 |  | 205 |  | 192 |
Income (Loss) Before Income Taxes |  |  | 5,824 |  | (740) |  | 3,452 |
Income Tax Provision (Benefit) |  |  | 1,247 |  | (157) |  | 761 |
Additions to Oil and Gas Properties, Excluding Dry Hole Costs |  |  | 3,557 |  | 3,318 |  | 6,209 |
Total Property, Plant and Equipment, Net |  |  | 28,213 |  | 28,284 |  | 30,102 |
Total Assets |  |  | 37,436 |  | 35,048 |  | 36,275 |
Amount of sales with a single significant purchaser in the United States segment |  |  | 2,700 |  | 1,100 |  | 2,400 |
Amount of sales with a second significant purchaser in the United States segment. |  |  | 2,600 |  |  |  | 2,200 |
Pretax Impairment Charges For Proved Oil And Gas Properties And Other Property Plant And Equipment |  |  |  |  | 1,570 |  |  |
Pretax Impairment Charges For Other Assets |  |  |  |  | 228 |  |  |
United States | Crude Oil and Condensate |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | 11,094 |  | 5,774 |  | 9,599 |
United States | Natural Gas Liquids |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | 1,812 |  | 668 |  | 785 |
United States | Natural Gas |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | 2,156 |  | 614 |  | 867 |
United States | Gains (Losses) on Mark-to-Market Commodity Derivative Contracts |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | (1,152) |  | 1,145 |  | 180 |
United States | Gathering, Processing and Marketing |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | 4,287 |  | 2,581 |  | 5,355 |
United States | Gains (Losses) on Asset Dispositions, Net |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | (40) |  | (47) |  | 132 |
United States | Other, Net |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | 108 |  | 60 |  | 134 |
Trinidad |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Operating Revenues and Other |  |  | 300 |  | 182 |  | 271 |
Depreciation, Depletion and Amortization |  |  | 87 |  | 60 |  | 80 |
Operating Income (Loss) |  |  | 151 |  | 75 |  | 113 |
Interest Income |  |  | 0 |  | 1 |  | 4 |
Other Income (Expense) |  |  | 8 |  | (2) |  | 1 |
Net Interest Expense (Income) |  |  | 0 |  | 0 |  | 0 |
Income (Loss) Before Income Taxes |  |  | 159 |  | 74 |  | 118 |
Income Tax Provision (Benefit) |  |  | 66 |  | 15 |  | 41 |
Additions to Oil and Gas Properties, Excluding Dry Hole Costs |  |  | 55 |  | 83 |  | 53 |
Total Property, Plant and Equipment, Net |  |  | 204 |  | 210 |  | 184 |
Total Assets |  |  | 637 |  | 546 |  | 706 |
Trinidad | Crude Oil and Condensate |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | 31 |  | 11 |  | 11 |
Trinidad | Natural Gas Liquids |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | 0 |  | 0 |  | 0 |
Trinidad | Natural Gas |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | 270 |  | 169 |  | 259 |
Trinidad | Gains (Losses) on Mark-to-Market Commodity Derivative Contracts |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | 0 |  | 0 |  | 0 |
Trinidad | Gathering, Processing and Marketing |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | 1 |  | 2 |  | 5 |
Trinidad | Gains (Losses) on Asset Dispositions, Net |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | (2) |  | 0 |  | (4) |
Trinidad | Other, Net |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  |  | 0 |  | 0 |  | 0 |
Other International |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Operating Revenues and Other | [6] |  | 77 |  | 55 |  | 57 |
Depreciation, Depletion and Amortization | [6] |  | 6 |  | 16 |  | 18 |
Operating Income (Loss) | [6] |  | (62) | [7] | (73) | [5] | (33) |
Interest Income | [6] |  | 0 |  | 0 |  | 0 |
Other Income (Expense) |  |  | 12 |  | 0 | [6] | 1 | [6]
Net Interest Expense (Income) | [6] |  | 0 |  | 0 |  | (7) |
Income (Loss) Before Income Taxes | [6] |  | (50) |  | (73) |  | (25) |
Income Tax Provision (Benefit) | [6] |  | (44) |  | 8 |  | 8 |
Additions to Oil and Gas Properties, Excluding Dry Hole Costs | [6] |  | 5 |  | 42 |  | 12 |
Total Property, Plant and Equipment, Net | [6] |  | 9 |  | 105 |  | 78 |
Total Assets | [6] |  | 163 |  | 211 |  | 144 |
Pretax Impairment Charges For Proved Oil And Gas Properties And Other Property Plant And Equipment |  |  | 45 |  | 81 |  |  |
Dry Hole Costs |  |  | 42 |  |  |  |  |
Other International | Crude Oil and Condensate |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues | [6] |  | 0 |  | 1 |  | 3 |
Other International | Natural Gas Liquids |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues | [6] |  | 0 |  | 0 |  | 0 |
Other International | Natural Gas |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues | [6] |  | 18 |  | 54 |  | 58 |
Other International | Gains (Losses) on Mark-to-Market Commodity Derivative Contracts |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues | [6] |  | 0 |  | 0 |  | 0 |
Other International | Gathering, Processing and Marketing |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues | [6] |  | 0 |  | 0 |  | 0 |
Other International | Gains (Losses) on Asset Dispositions, Net |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues |  | $ 58 | 59 | [6] | 0 | [6] | (4) | [6]
Other International | Other, Net |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Revenues | [6] |  | $ 0 |  | $ 0 |  | $ 0 |
[1] | Excludes gains or losses on the mark-to-market of financial commodity derivative contracts, gains or losses on sales of reserves and related assets, interest charges and general corporate expenses for each of the three years in the period ended December 31, 2021.
[2] | EOG had sales activity with two significant purchasers in 2021, one totaling $2.7 billion and the other totaling $2.6 billion of consolidated Operating Revenues and Other in the United States segment.
[3] | EOG had sales activity with three significant purchasers in 2020, each totaling $1.1 billion of consolidated Operating Revenues and Other in the United States segment.
[4] | EOG had sales activity with two significant purchasers in 2019, one totaling $2.4 billion and the other totaling $2.2 billion of consolidated Operating Revenues and Other in the United States segment.
[5] | EOG recorded pretax impairment charges of $1,570 million in 2020 for proved oil and gas properties, leasehold costs and other assets due to the decline in commodity prices and revisions of asset retirement obligations for certain properties in the United States segment. In addition, EOG recorded pretax impairment charges of $228 million in 2020 for owned and leased sand and crude-by-rail assets, also in the United States segment. EOG recorded pretax impairment charges of $81 million in 2020 for proved oil and gas properties and firm commitment contracts related to its decision to exit the Horn River Basin in British Columbia, Canada, in the Other International segment. See Notes 13 and 14.
[6] | Other International primarily consists of EOG's China and Canada operations. The China operations were sold in the second quarter of 2021. EOG began exploration programs in Australia in the third quarter of 2021 and in Oman in the third quarter of 2020. The decision was reached in the fourth quarter of 2021 to exit Block 36 and Block 49 in Oman.
[7] | EOG recorded pretax impairment charges of $45 million and dry hole costs of $42 million in 2021 in the Other International segment related to its decision in the fourth quarter of 2021 to exit Block 36 and Block 49 in Oman. In addition, EOG recorded net gains of asset dispositions of $58 million in 2021 in the Other International segment during the second quarter of 2021 due to the sale of its China operations. See Notes 14 and 17, respectively.

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