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Segment Information (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Operating Revenues and Other |  | $ 4,139,000,000 | $ 1,103,000,000 |  | $ 7,833,000,000 | $ 5,821,000,000 |  |
Operating Income (Loss) |  | 1,171,000,000 | (1,087,000,000) |  | 2,103,000,000 | (1,029,000,000) |  |
Other Income (Expense), Net |  | (2,000,000) | (4,000,000) |  | (6,000,000) | 14,000,000 |  |
Interest Expense, Net |  | (45,000,000) | (54,000,000) |  | (92,000,000) | (99,000,000) |  |
Income (Loss) Before Income Taxes |  | 1,124,000,000 | (1,145,000,000) |  | 2,005,000,000 | (1,114,000,000) |  |
Total Assets |  | 36,885,000,000 |  |  | 36,885,000,000 |  |  | $ 35,805,000,000
United States |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Operating Revenues and Other |  | 3,995,000,000 | 1,055,000,000 |  | 7,601,000,000 | 5,716,000,000 |  |
Operating Income (Loss) | [1] | 1,077,000,000 | (1,079,000,000) |  | 1,967,000,000 | (974,000,000) |  |
Total Assets |  | 36,057,000,000 |  |  | 36,057,000,000 |  |  | 35,048,000,000
Pretax Impairment Charges for Proved Oil and Gas Properties and Other Property, Plant and Equipment |  |  | 6,000,000 |  |  | 1,462,000,000 |  |
Pretax Impairment Changes For Other Assets |  |  | 219,000,000 |  |  | 219,000,000 |  |
Trinidad |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Operating Revenues and Other |  | 81,000,000 | 34,000,000 |  | 157,000,000 | 76,000,000 |  |
Operating Income (Loss) |  | 41,000,000 | 10,000,000 |  | 84,000,000 | 23,000,000 |  |
Total Assets |  | 580,000,000 |  |  | 580,000,000 |  |  | 546,000,000
Other International |  |  |  |  |  |  |  |
Schedule of Segment Reporting Information By Segment [Abstract] |  |  |  |  |  |  |  |
Operating Revenues and Other | [2] | 63,000,000 | 14,000,000 |  | 75,000,000 | 29,000,000 |  |
Operating Income (Loss) | [2] | 53,000,000 | (18,000,000) | [3] | 52,000,000 | (78,000,000) | [3] |
Total Assets | [4] | $ 248,000,000 |  |  | $ 248,000,000 |  |  | $ 211,000,000
Pretax Impairment Charges for Proved Oil and Gas Properties and Other Property, Plant and Equipment |  |  | $ 19,000,000 |  |  | $ 79,000,000 |  |
[1] | EOG recorded pretax impairment charges of $6 million and $1,462 million for the three and six months ended June 30, 2020, respectively, for proved oil and gas properties, leasehold costs and other assets due to the decline in commodity prices. See Note 11. In addition, EOG recorded pretax impairment charges of $219 million for the three and six months ended June 30, 2020, for sand and crude-by-rail assets.
[2] | Other International primarily consists of EOG's China and Canada operations. The China operations were sold in the second quarter of 2021. EOG began an exploration program in Oman in the third quarter of 2020.
[3] | EOG recorded pretax impairment charges of $19 million for the three months ended June 30, 2020, and $79 million for the six months ended June 30, 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.
[4] | Other International primarily consists of EOG's China and Canada operations. The China operations were sold in the second quarter of 2021. EOG began an exploration program in Oman in the third quarter of 2020.

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