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]  
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
$ 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 
Revision in estimated cash flows 48  — 
Remediation payments (2) (4)
Asset retirement obligations as of March 31 $ 510  $ 524