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Asset Retirement Obligations (Tables) | 3 Months Ended
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Mar. 31, 2022
Asset Retirement Obligation [Abstract] |
Asset Retirement Obligation Rollforward Analysis | 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 three-month periods ended March 31, 2022 and 2021 (in millions):
| Three Months Ended March 31,
| 2022 |  | 2021
Carrying Amount at January 1 | $ | 1,231 |  |  | $ | 1,217 |
Liabilities Incurred | 20 |  |  | 12 |
Liabilities Settled (1) | (131) |  |  | (5) |
Accretion | 11 |  |  | 11 |
Revisions | 2 |  |  | 2 |
Carrying Amount at March 31 | $ | 1,133 |  |  | $ | 1,237 |
Current Portion | $ | 41 |  |  | $ | 49 |
Noncurrent Portion | $ | 1,092 |  |  | $ | 1,188 |
(1)Includes settlements related to asset sales.

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- Definition Tabular disclosure of the carrying amount of a liability for asset retirement obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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