Annual report [Section 13 and 15(d), not S-K Item 405]

FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value of Derivative Asset (Details)

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FAIR VALUE OF FINANCIAL INSTRUMENTS - Fair Value of Derivative Asset (Details) - Commodity Option - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]    
Beginning balance as of January 1 $ 95 $ 0
Fair value of option acquired in connection with Stelco Acquisition 0 110
Total expense included in earnings (45) (12)
Foreign currency translation 4 (3)
Ending balance as of December 31 $ 54 $ 95