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ASSET RETIREMENT OBLIGATIONS (Tables)
 12 Months Ended
Dec. 31, 2024
Environmental Remediation Obligations [Abstract]  
Schedule of Asset Retirement Obligations
The following is a summary of our asset retirement obligations:
December 31,
(In millions)20242023
Asset retirement obligations1
$526 $459 
Less: current portion25 15 
Long-term asset retirement obligations$501 $444 
1 Includes $302 million and $259 million related to our active operations as of December 31, 2024 and 2023, respectively.
Roll-forward of Asset Retirement Obligation Liability
The following is a roll-forward of our asset retirement obligation:
(In millions)20242023
Asset retirement obligation as of January 1$459 $520 
Increase from Stelco Acquisition20 — 
Decrease from sale of business— (76)
Accretion expense22 26 
Remediation payments(33)(21)
Revision in estimated cash flows58 10 
Asset retirement obligation as of December 31$526 $459 
Schedule of Environmental Obligations
The following is a summary of our environmental obligations:
December 31,
(In millions)20242023
Environmental obligations$114 $134 
Less: current portion14 21 
Long-term environmental obligations$100 $113