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ASSET RETIREMENT OBLIGATIONS (Tables)
 12 Months Ended
Dec. 31, 2025
Environmental Remediation Obligations [Abstract]  
Schedule of Asset Retirement Obligations
The following is a summary of our asset retirement obligations:
December 31,
(In millions)20252024
Asset retirement obligations1
$599 $526 
Less: current portion18 25 
Long-term asset retirement obligations$581 $501 
1 Includes $375 million and $302 million related to our active operations as of December 31, 2025 and 2024, respectively.
Roll-forward of Asset Retirement Obligation Liability
The following is a roll-forward of our asset retirement obligation:
(In millions)20252024
Asset retirement obligation as of January 1$526 $459 
Increase from Stelco Acquisition18 20 
Accretion expense30 22 
Remediation payments(19)(33)
Revision in estimated cash flows44 58 
Asset retirement obligation as of December 31$599 $526 
Schedule of Environmental Obligations
The following is a summary of our environmental obligations:
December 31,
(In millions)20252024
Environmental obligations$112 $114 
Less: current portion11 14 
Long-term environmental obligations$101 $100