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ASSET RETIREMENT OBLIGATIONS (Tables) | 3 Months Ended
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Mar. 31, 2022
Asset Retirement Obligation [Abstract] |
Summary Of Asset Retirement Obligations | The following is a summary of our asset retirement obligations:
| (In Millions)
| March 31, 2022 |  | December 31, 2021
Asset retirement obligations 1 | $ | 460 |  |  | $ | 449 |
Less: current portion | 33 |  |  | 35 |
Long-term asset retirement obligations | $ | 427 |  |  | $ | 414 |
1 Includes $297 million and $293 million related to our active operations as of March 31, 2022 and December 31, 2021, respectively.
Schedule of Change in Asset Retirement Obligation | The following is a roll forward of our asset retirement obligation liability:
| (In Millions)
| 2022 |  | 2021
Asset retirement obligation as of January 1 | $ | 449 |  |  | $ | 342 |
Decrease from acquisitions | — |  |  | (34) |
Accretion expense | 7 |  |  | 3 |
Revision in estimated cash flows | 7 |  |  | — |
Remediation payments | (3) |  |  | (1) |
Asset retirement obligation as of March 31 | $ | 460 |  |  | $ | 310 |

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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