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FAIR VALUE MEASUREMENTS - MinnTac Option (Details) - Commodity Option - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative Instrument, Percentage Of Interest In Commodity Option 25.00%  
Derivative Asset $ 500  
Beginning balance as of January 1 54 $ 95
Total expense included in earnings (22) (24)
Foreign currency translation (2) 5
Ending balance as of June 30 $ 30 $ 76