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ASSET RETIREMENT OBLIGATIONS (Tables) | 6 Months Ended
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Jun. 30, 2024
Asset Retirement Obligation [Abstract] |
Summary of Asset Retirement Obligations | The following is a summary of our asset retirement obligations:
(In millions) | June 30, 2024 |  | December 31, 2023
Asset retirement obligations 1 | $ | 506 |  |  | $ | 459 |
Less: current portion | 51 |  |  | 15 |
Long-term asset retirement obligations | $ | 455 |  |  | $ | 444 |
1 Includes $266 million and $259 million related to our active operations as of June 30, 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 | 11 |  |  | 13 |
Revision in estimated cash flows | 50 |  |  | 1 |
Remediation payments | (14) |  |  | (9) |
Asset retirement obligations as of June 30 | $ | 506 |  |  | $ | 525 |

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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 -Topic 410 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481850/410-20-50-1 + Details
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