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Asset Retirement Obligations (Tables) | 3 Months Ended
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Mar. 31, 2021
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, 2021 and 2020 (in millions):
| Three Months Ended March 31,
| 2021 |  | 2020
Carrying Amount at January 1 | $ | 1,217 |  |  | $ | 1,111 |
Liabilities Incurred | 12 |  |  | 15 |
Liabilities Settled (1) | (5) |  |  | (24) |
Accretion | 11 |  |  | 11 |
Revisions | 2 |  |  | — |
Carrying Amount at March 31 | $ | 1,237 |  |  | $ | 1,113 |
Current Portion | $ | 49 |  |  | $ | 38 |
Noncurrent Portion | $ | 1,188 |  |  | $ | 1,075 |
(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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