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SUPPLEMENTARY FINANCIAL STATEMENT INFORMATION - Non-cash Investing and Financing Activities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Noncash or Part Noncash Acquisitions [Line Items] |  |  |
1.500% 2025 Convertible Senior Notes redemption | $ 25 | $ 0 | $ 0
Ferrous Processing and Trading |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |
Fair value of settlement of a pre-existing relationship as part of consideration in connection with transaction | 0 | 20 | 0
ArcelorMittal USA |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |
Fair value of settlement of a pre-existing relationship as part of consideration in connection with transaction | 0 | 0 | 237
ArcelorMittal USA | Common Stock |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |
Fair value of other consideration given | 0 | 0 | 990
ArcelorMittal USA | Series B Preferred Stock |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |
Fair value of other consideration given | 0 | 0 | 738
AK Steel | Common Stock |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |
Fair value of other consideration given | 0 | 0 | 618
Share-based Payment Arrangement | AK Steel |  |  |
Noncash or Part Noncash Acquisitions [Line Items] |  |  |
Fair value of other consideration given | $ 0 | $ 0 | $ 4

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