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

ACQUISITIONS - Pro Forma (Details)

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ACQUISITIONS - Pro Forma (Details) - Stelco Holdings Inc - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]    
Revenues $ 20,874 $ 24,158
Business Acquisition, Pro Forma Net Income (Loss) $ (623) $ 216