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ASSET RETIREMENT OBLIGATIONS (Tables) | 3 Months Ended
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Mar. 31, 2023
Asset Retirement Obligation [Abstract] |
Summary Of Asset Retirement Obligations | The following is a summary of our asset retirement obligations:
(In millions) | March 31, 2023 |  | December 31, 2022
Asset retirement obligations 1 | $ | 524 |  |  | $ | 520 |
Less: current portion | 24 |  |  | 21 |
Long-term asset retirement obligations | $ | 500 |  |  | $ | 499 |
1 Includes $279 million and $277 million related to our active operations as of March 31, 2023 and December 31, 2022, respectively.
Schedule of Change in Asset Retirement Obligation | The following is a roll forward of our asset retirement obligation liability:
(In millions) | 2023 |  | 2022
Asset retirement obligation as of January 1 | $ | 520 |  |  | $ | 449 |
Accretion expense | 8 |  |  | 7 |
Revision in estimated cash flows | — |  |  | 7 |
Remediation payments | (4) |  |  | (3) |
Asset retirement obligation as of March 31 | $ | 524 |  |  | $ | 460 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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