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ASSET RETIREMENT OBLIGATIONS (Tables)
 9 Months Ended
Sep. 30, 2025
Asset Retirement Obligation [Abstract]  
Summary of Asset Retirement Obligations
The following is a summary of our asset retirement obligations:
(In millions)September 30,
2025		December 31,
2024
Asset retirement obligations1
$535 $526 
Less: current portion18 25 
Long-term asset retirement obligations$517 $501 
1 Includes $310 million and $302 million related to our active operations as of September 30, 2025 and December 31, 2024, respectively.
Schedule of Change in Asset Retirement Obligation
The following is a roll-forward of our asset retirement obligations:
(In millions)20252024
Asset retirement obligations as of January 1$526 $459 
Accretion expense21 17 
Revision in estimated cash flows4 49 
Remediation payments(16)(24)
Asset retirement obligations as of September 30$535 $501 
During the first quarter of 2024, we announced the indefinite idle of our Weirton tinplate production plant, resulting in an increase to our asset retirement obligations as a result of acceleration of the timing and refinement in the cost required.
Schedule of Environmental Obligations
The following is a summary of our environmental obligations:
(In millions)September 30,
2025		December 31,
2024
Environmental obligations$112 $114 
Less: current portion15 14 
Long-term environmental obligations$97 $100