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ACQUISITIONS - Stelco Acquisition (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Business Acquisition [Line Items] |  |  |
Acquisition related costs | $ 42 |  |
Revenues | 19,185 | $ 21,996 | $ 22,989
Net loss attributable to acquisition | (754) | 399 | $ 1,335
Stelco Holdings Inc |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Pro Forma Net Income (Loss) | (623) | 216 |
Revenues | 329 |  |
Net loss attributable to acquisition | 58 |  |
Stelco Holdings Inc | Fair Value Adjustment to Inventory |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Pro Forma Net Income (Loss) | 23 | 23 |
Stelco Holdings Inc | Acquisition-related Costs |  |  |
Business Acquisition [Line Items] |  |  |
Business Acquisition, Pro Forma Net Income (Loss) | $ 63 | $ 63 |

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