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Quarterly report pursuant to Section 13 or 15(d)

ASSET RETIREMENT OBLIGATIONS (Tables)

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ASSET RETIREMENT OBLIGATIONS (Tables)
3 Months Ended
Mar. 31, 2024
Asset Retirement Obligation [Abstract] Ìý
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 obligations1
$ 510Ìý $ 459Ìý
Less: current portion 61Ìý 15Ìý
Long-term asset retirement obligations $ 449Ìý $ 444Ìý
1 Includes $263 million and $259 million related to our active operations as of MarchÌý31, 2024 and DecemberÌý31, 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 $ 459Ìý $ 520Ìý
Accretion expense 5Ìý 8Ìý
Revision in estimated cash flows 48Ìý —Ìý
Remediation payments (2) (4)
Asset retirement obligations as of March 31 $ 510Ìý $ 524Ìý