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DEBT AND CREDIT FACILITIES - Debt Redemption (Details) - USD ($) $ in Millions | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2025 | Feb. 06, 2025 | Dec. 31, 2024
Debt Instrument, Redemption [Line Items] |  |  |
Aggregate principal amount | $ 7,815 |  | $ 7,148
7.500% 2031 Senior Notes [Member] | Cleveland-Cliffs Inc. |  |  |
Debt Instrument, Redemption [Line Items] |  |  |
Aggregate principal amount | $ 850 | $ 850 | $ 0
Stated interest rate | 7.50% | 7.50% |
Repurchase price if triggering event occurs | 101.00% |  |
7.500% 2031 Senior Notes [Member] | Cleveland-Cliffs Inc. | Minimum |  |  |
Debt Instrument, Redemption [Line Items] |  |  |
Redemption notice period | 10 days |  |
7.500% 2031 Senior Notes [Member] | Cleveland-Cliffs Inc. | Maximum |  |  |
Debt Instrument, Redemption [Line Items] |  |  |
Redemption notice period | 60 days |  |
7.500% 2031 Senior Notes [Member] | Debt Instrument, Redemption, Period One | Cleveland-Cliffs Inc. |  |  |
Debt Instrument, Redemption [Line Items] |  |  |
Redemption price percentage | 100.00% |  |
7.500% 2031 Senior Notes [Member] | Debt Instrument, Redemption, Period One, Upon Equity Issuance | Cleveland-Cliffs Inc. |  |  |
Debt Instrument, Redemption [Line Items] |  |  |
Redemption price percentage | 107.50% |  |
Percentage of principal available for redemption | 35.00% |  |
7.500% 2031 Senior Notes [Member] | Debt Instrument, Redemption, Period Two | Cleveland-Cliffs Inc. |  |  |
Debt Instrument, Redemption [Line Items] |  |  |
Redemption price percentage | 103.75% |  |
7.500% 2031 Senior Notes [Member] | Debt Instrument, Redemption, Period Three | Cleveland-Cliffs Inc. |  |  |
Debt Instrument, Redemption [Line Items] |  |  |
Redemption price percentage | 101.875% |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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