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DEBT AND CREDIT FACILITIES - Debt Issuances and Terms (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |
Total debt | $ 4,306 | $ 5,369
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc. |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 6.75% |
Repurchase price if triggering event occurs | 101.00% |
Total debt | $ 829 | 845
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period One |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 105.063% |
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period Two |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 103.375% |
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period Three |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 101.688% |
7.000% 2027 Senior Notes | Cleveland-Cliffs Inc. |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 7.00% |
Total debt | $ 73 | 73
7.000% 2027 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period One |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 103.50% |
7.000% 2027 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period Two |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 102.333% |
7.000% 2027 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period Three |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 101.167% |
5.875% 2027 Senior Notes | Cleveland-Cliffs Inc. |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 5.875% |
Total debt | $ 556 | 556
5.875% 2027 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period One |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 102.938% |
5.875% 2027 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period Two |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 101.958% |
5.875% 2027 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period Three |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 100.979% |
4.625% 2029 Senior Notes | Cleveland-Cliffs Inc. |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.625% |
Total debt | $ 368 | 500
4.625% 2029 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period One |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 102.313% |
4.625% 2029 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period Two |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 101.156% |
4.625% 2029 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period One, Upon Equity Issuance |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 104.625% |
4.875% 2031 Senior Notes | Cleveland-Cliffs Inc. |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.875% |
Total debt | $ 325 | 500
4.875% 2031 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period One |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 102.438% |
4.875% 2031 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period Two |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 101.625% |
4.875% 2031 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period Three |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 100.813% |
4.875% 2031 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period One, Upon Equity Issuance |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 104.875% |
6.250% 2040 Senior Notes | Cleveland-Cliffs Inc. |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 6.25% |
Total debt | $ 235 | 263
6.250% 2040 Senior Notes | Cleveland-Cliffs Inc. | Debt Instrument, Redemption, Period One |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 100.00% |
7.000% 2027 AK Senior Notes | AK Steel |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 7.00% |
Total debt | $ 56 | $ 56
7.000% 2027 AK Senior Notes | AK Steel | Debt Instrument, Redemption, Period One |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 103.50% |
7.000% 2027 AK Senior Notes | AK Steel | Debt Instrument, Redemption, Period Two |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 102.333% |
7.000% 2027 AK Senior Notes | AK Steel | Debt Instrument, Redemption, Period Three |  |
Debt Instrument [Line Items] |  |
Redemption price, percentage | 101.167% |
Unsecured Debt | Cleveland-Cliffs Inc. |  |
Debt Instrument [Line Items] |  |
Repurchase price if triggering event occurs | 101.00% |

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