v3.26.1
ASSET RETIREMENT OBLIGATIONS (Tables)
 6 Months Ended
Jun. 30, 2026
Asset Retirement Obligation [Abstract]  
Summary of Asset Retirement Obligations
The following is a summary of our asset retirement obligations:
(In millions)June 30,
2026		December 31,
2025
Asset retirement obligations1
$611 $599 
Less: current portion17 18 
Long-term asset retirement obligations$594 $581 
1 Includes $383 million and $375 million related to our active operations as of June 30, 2026 and December 31, 2025, respectively.
Schedule of Change in Asset Retirement Obligation
The following is a roll-forward of our asset retirement obligations:
(In millions)20262025
Asset retirement obligations as of January 1$599 $526 
Accretion expense17 15 
Revision in estimated cash flows— 5 
Remediation payments(5)(12)
Asset retirement obligations as of June 30$611 $534 
Schedule of Environmental Obligations
The following is a summary of our environmental obligations:
(In millions)June 30,
2026		December 31,
2025
Environmental obligations$115 $112 
Less: current portion14 11 
Long-term environmental obligations$101 $101