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ASSET RETIREMENT OBLIGATIONS - Environmental Obligations Disclosure (Details) - USD ($)
$ in Millions
Sep. 30, 2026
Dec. 31, 2025
Environmental Remediation Obligations [Abstract]    
Accrual for Environmental Loss Contingencies $ 114 $ 112
Accrued Environmental Loss Contingencies, Current 14 11
Accrued Environmental Loss Contingencies, Noncurrent $ 100 $ 101