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DEBT AND CREDIT FACILITIES - Schedule of Extinguishment of Debt (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 11, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Extinguished |  | $ 914 |  | $ 1,274 |
Gain (Loss) on Extinguishment of Debt |  | (66) | $ (22) | (80) | $ (88)
9.875% 2025 Senior Secured Notes |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Extinguished | $ 322 | 607 |  | 607 |
Gain (Loss) on Extinguishment of Debt |  | $ (85) |  | $ (85) |
9.875% 2025 Senior Secured Notes | Cleveland-Cliffs Inc. |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Stated interest rate |  | 9.875% |  | 9.875% |
6.750% 2026 Senior Secured Notes |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Extinguished |  | $ 16 |  | $ 16 |
Gain (Loss) on Extinguishment of Debt |  | $ (1) |  | $ (1) |
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc. |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Stated interest rate |  | 6.75% |  | 6.75% |
1.500% 2025 Convertible Senior Notes |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Extinguished |  | $ 0 |  | $ 294 |
Gain (Loss) on Extinguishment of Debt |  | $ 0 |  | $ (16) |
1.500% 2025 Convertible Senior Notes | Cleveland-Cliffs Inc. |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Stated interest rate |  | 1.50% |  | 1.50% |
4.625% 2029 Senior Notes |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Extinguished |  | $ 130 |  | $ 130 |
Gain (Loss) on Extinguishment of Debt |  | $ 8 |  | $ 8 |
4.625% 2029 Senior Notes | Cleveland-Cliffs Inc. |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Stated interest rate |  | 4.625% |  | 4.625% |
4.875% 2031 Senior Notes |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Extinguished |  | $ 161 |  | $ 161 |
Gain (Loss) on Extinguishment of Debt |  | $ 12 |  | $ 12 |
4.875% 2031 Senior Notes | Cleveland-Cliffs Inc. |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Stated interest rate |  | 4.875% |  | 4.875% |
Industrial Revenue Bonds |  |  |  |  |
Extinguishment of Debt [Line Items] |  |  |  |  |
Debt Extinguished |  | $ 0 |  | $ 66 |
Gain (Loss) on Extinguishment of Debt |  | $ 0 |  | $ 2 |

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