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v3.25.3

SUBSEQUENT EVENTS (Details) - USD ($) $ in Millions |  |  | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 10, 2025 | Oct. 03, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 08, 2025 | Dec. 31, 2024
Subsequent Event [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 8,135 |  |  | $ 7,148
Repayments of Long-term Debt |  |  | 0 | $ 845 |  |
7.625% 2034 Senior Notes [Member] | Cleveland-Cliffs Inc. |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Long-term Debt, Gross |  |  | $ 850 |  | $ 850 | $ 0
7.625% 2034 Senior Notes [Member] | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period One |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Redemption price percentage |  |  | 100.00% |  |  |
7.625% 2034 Senior Notes [Member] | Subsequent Event | Cleveland-Cliffs Inc. |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Long-term Debt, Gross | $ 275 |  |  |  |  |
7.625% 2034 Senior Notes [Member] | Subsequent Event | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period One |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Redemption price percentage | 102.75% |  |  |  |  |
5.875% 2027 Senior Notes, 7.000% 2027 Senior Notes, and 7.000% 2027 AK Senior Notes | Senior notes | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Repayments of Long-term Debt |  | $ 685 |  |  |  |

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