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CAPITAL STOCK - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 11, 2021 | Dec. 09, 2020 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2022 | Feb. 10, 2022 | Dec. 31, 2021 | Feb. 11, 2021
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Authorized amount of stock repurchase |  |  |  |  |  |  | $ 1,000 |  |
Common stock repurchases |  |  | $ 34 | $ 157 | $ 19 |  |  |  |
Common shares, issued (in shares) |  |  | 531,051,530 |  |  | 531,051,530 |  | 506,832,537 | 20,000,000
Debt Extinguished |  |  | $ 41 |  |  | $ 1,315 |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock repurchases (shares) |  |  | 2,000,000 | 8,000,000 | 1,000,000 | 10,500,000 |  |  |
Common Shares in Treasury |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common stock repurchases |  |  | $ 34 | $ 157 | $ 19 | $ 210 |  |  |
9.875% 2025 Senior Secured Notes |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Debt Extinguished | $ 322 |  | $ 0 |  |  | $ 607 |  |  |
Arcelor Mittal |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Common shares sold (in shares) |  |  |  |  |  |  |  |  | 40,000,000
Cleveland-Cliffs Inc. | 9.875% 2025 Senior Secured Notes |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stated interest rate |  |  | 9.875% |  |  | 9.875% |  |  |
Common Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Share price (in dollars per share) |  |  |  |  |  |  |  |  | $ 16.12
Common Stock | ArcelorMittal USA |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Stock issued during period, shares, acquisitions (in shares) |  | 78,000,000 |  |  |  |  |  |  |
Series A Preferred Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock authorized (in shares) |  |  | 3,000,000 |  |  | 3,000,000 |  |  |
Preferred stock outstanding (in shares) |  |  | 0 |  |  | 0 |  |  |
Preferred stock issued (in shares) |  |  | 0 |  |  | 0 |  |  |
Series B Preferred Stock |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Preferred stock authorized (in shares) |  |  | 4,000,000 |  |  | 4,000,000 |  |  |
Preferred stock outstanding (in shares) |  |  | 0 |  |  | 0 |  |  |
Preferred stock issued (in shares) |  |  | 0 |  |  | 0 |  |  |

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