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Asset Retirement Obligations | 9 Months Ended
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Sep. 30, 2021
Asset Retirement Obligation [Abstract] |
Asset Retirement Obligations | Asset Retirement Obligations The following table presents the reconciliation of the beginning and ending aggregate carrying amounts of short-term and long-term legal obligations associated with the retirement of property, plant and equipment for the nine-month periods ended September 30, 2021 and 2020 (in millions):
| Nine Months Ended September 30,
| 2021 |  | 2020
Carrying Amount at January 1 | $ | 1,217 |  |  | $ | 1,111 |
Liabilities Incurred | 55 |  |  | 29 |
Liabilities Settled (1) | (83) |  |  | (38) |
Accretion | 33 |  |  | 35 |
Revisions | (7) |  |  | 52 |
Carrying Amount at September 30 | $ | 1,215 |  |  | $ | 1,189 |
Current Portion | $ | 54 |  |  | $ | 50 |
Noncurrent Portion | $ | 1,161 |  |  | $ | 1,139 |
(1)Includes settlements related to asset sales. The current and noncurrent portions of EOG's asset retirement obligations are included in Current Liabilities - Other and Other Liabilities, respectively, on the Condensed Consolidated Balance Sheets.

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- Definition The entire disclosure for an asset retirement obligation and the associated long-lived asset. An asset retirement obligation is a legal obligation associated with the disposal or retirement from service of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2175671 + Details
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