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DEBT AND CREDIT FACILITIES - Debt Redemption (Details) - USD ($) $ in Millions |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Aug. 16, 2024 | Apr. 03, 2024 | Mar. 18, 2024 | Sep. 30, 2024 | Dec. 31, 2023
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Aggregate principal amount |  |  |  | $ 3,835 | $ 3,192
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc. |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Aggregate principal amount |  |  |  | $ 0 | 829
Stated interest rate |  |  |  | 6.75% |
Amount of debt extinguished |  | $ 189 | $ 640 |  |
7.000% 2032 Senior Notes | Cleveland-Cliffs Inc. |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Aggregate principal amount | $ 600 |  | $ 825 | $ 1,425 | $ 0
Stated interest rate |  |  |  | 7.00% |
Repurchase price if triggering event occurs |  |  |  | 101.00% |
Debt issuance price as a percent of face amount | 99.25% |  |  |  |
7.000% 2032 Senior Notes | Cleveland-Cliffs Inc. | Minimum |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Redemption notice period |  |  |  | 10 days |
7.000% 2032 Senior Notes | Cleveland-Cliffs Inc. | Maximum |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Redemption notice period |  |  |  | 60 days |
7.000% 2032 Senior Notes | Debt Instrument, Redemption, Period One | Cleveland-Cliffs Inc. |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Redemption price percentage |  |  |  | 100.00% |
7.000% 2032 Senior Notes | Debt Instrument, Redemption, Period One, Upon Equity Issuance | Cleveland-Cliffs Inc. |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Redemption price percentage |  |  |  | 107.00% |
Percentage of principal available for redemption |  |  |  | 35.00% |
7.000% 2032 Senior Notes | Debt Instrument, Redemption, Period Two | Cleveland-Cliffs Inc. |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Redemption price percentage |  |  |  | 103.50% |
7.000% 2032 Senior Notes | Debt Instrument, Redemption, Period Three | Cleveland-Cliffs Inc. |  |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |  |
Redemption price percentage |  |  |  | 101.75% |

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