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ASSET RETIREMENT OBLIGATIONS (Tables) | 3 Months Ended
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Mar. 31, 2024
Asset Retirement Obligation [Abstract] |
Summary of Asset Retirement Obligations | The following is a summary of our asset retirement obligations:
(In millions) | March 31, 2024 |  | December 31, 2023
Asset retirement obligations 1 | $ | 510 |  |  | $ | 459 |
Less: current portion | 61 |  |  | 15 |
Long-term asset retirement obligations | $ | 449 |  |  | $ | 444 |
1 Includes $263 million and $259 million related to our active operations as of March 31, 2024 and December 31, 2023, respectively.
Schedule of Change in Asset Retirement Obligation | The following is a roll-forward of our asset retirement obligations:
(In millions) | 2024 |  | 2023
Asset retirement obligations as of January 1 | $ | 459 |  |  | $ | 520 |
Accretion expense | 5 |  |  | 8 |
Revision in estimated cash flows | 48 |  |  | — |
Remediation payments | (2) |  |  | (4) |
Asset retirement obligations as of March 31 | $ | 510 |  |  | $ | 524 |

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