Quarterly report [Sections 13 or 15(d)]

FAIR VALUE MEASUREMENTS - MinnTac Option (Details)

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FAIR VALUE MEASUREMENTS - MinnTac Option (Details) - Commodity Option - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2026
Mar. 31, 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 (10) (9)
Foreign currency translation (1) 0
Ending balance as of March 31 $ 43 $ 86