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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2021
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 September 30, 2021 and December 31, 2020 (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 September 30, 2021 |  |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |
Natural Gas Swaps | $ | — |  |  | $ | 21 |  |  | $ | — |  |  | $ | 21 |
Financial Liabilities: |  |  |  |  |  |  |
Natural Gas Swaps | — |  |  | 329 |  |  | — |  |  | 329 |
Crude Oil Swaps | — |  |  | 226 |  |  | — |  |  | 226 |
Crude Oil Roll Differential Swaps | — |  |  | 32 |  |  | — |  |  | 32 |
Natural Gas Liquids Swaps | — |  |  | 43 |  |  | — |  |  | 43 |
At December 31, 2020 |  |  |  |  |  |  |
Financial Assets: |  |  |  |  |  |  |
Natural Gas Swaps | $ | — |  |  | $ | 66 |  |  | $ | — |  |  | $ | 66 |
Financial Liabilities: |  |  |  |  |  |  |
Crude Oil Roll Differential Swaps | — |  |  | 1 |  |  | — |  |  | 1 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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