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Segment Information (Tables) | 9 Months Ended
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Sep. 30, 2021
Segment Reporting [Abstract] |
Selected Financial Information by Reportable Segment | Selected financial information by reportable segment is presented below for the three-month and nine-month periods ended September 30, 2021 and 2020 (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Operating Revenues and Other |  |  |  |  |  |  |
United States | $ | 4,692 |  |  | $ | 2,196 |  |  | $ | 12,293 |  |  | $ | 7,913 |
Trinidad | 72 |  |  | 35 |  |  | 229 |  |  | 111 |
Other International (1) | 1 |  |  | 15 |  |  | 76 |  |  | 43 |
Total | $ | 4,765 |  |  | $ | 2,246 |  |  | $ | 12,598 |  |  | $ | 8,067 |
Operating Income (Loss) |  |  |  |  |  |  |
United States (2) | $ | 1,455 |  |  | $ | (16) |  |  | $ | 3,422 |  |  | $ | (990) |
Trinidad | 37 |  |  | 12 |  |  | 121 |  |  | 35 |
Other International (1) (3) | (21) |  |  | 1 |  |  | 31 |  |  | (77) |
Total | 1,471 |  |  | (3) |  |  | 3,574 |  |  | (1,032) |
Reconciling Items |  |  |  |  |  |  |
Other Income, Net | 6 |  |  | 3 |  |  | — |  |  | 17 |
Interest Expense, Net | (48) |  |  | (53) |  |  | (140) |  |  | (152) |
Income (Loss) Before Income Taxes | $ | 1,429 |  |  | $ | (53) |  |  | $ | 3,434 |  |  | $ | (1,167) |
(1) 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. (2) EOG recorded pretax impairment charges of $26 million and $1,488 million for the three and nine months ended September 30, 2020, respectively, 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. See Note 11. In addition, EOG recorded pretax impairment charges of $1 million and $220 million for the three and nine months ended September 30, 2020, respectively, for sand and crude-by-rail assets. (3) EOG recorded pretax impairment charges of $13 million and zero for the three months ended September 30, 2021 and 2020, respectively, and $15 million and $79 million for the nine months ended September 30, 2021 and 2020, respectively, for proved oil and gas properties and firm commitment contracts related to its decision to exit the Horn River Basin in British Columbia, Canada.
Assets by Reportable Segment | Total assets by reportable segment are presented below at September 30, 2021 and December 31, 2020 (in millions):
| At September 30, 2021 |  | At December 31, 2020
Total Assets |  |  |
United States | $ | 36,330 |  |  | $ | 35,048 |
Trinidad | 597 |  |  | 546 |
Other International (1) | 245 |  |  | 211 |
Total | $ | 37,172 |  |  | $ | 35,805 |
(1) 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.

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- Definition Tabular disclosure of all significant reconciling items in the reconciliation of total assets from reportable segments to the entity's consolidated assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 31 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8924-108599 + Details
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- Definition Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8736-108599 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556970&loc=d3e13816-109267 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8906-108599 + Details
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