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
$ in Millions
9 Months Ended
Sep. 30, 2025
USD ($)
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 95
Change in fair value (34)
Foreign currency translation 4
Ending balance as of September 30 $ 65