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DEBT AND CREDIT FACILITIES - Debt Redemption (Details) - USD ($) $ in Millions |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Apr. 03, 2024 | Mar. 18, 2024 | Mar. 31, 2024 | Dec. 31, 2023
Debt Instrument, Redemption [Line Items] |  |  |  |
Aggregate principal amount |  |  | $ 3,719 | $ 3,192
7.000% 2032 Senior Notes | Cleveland-Cliffs Inc. |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
Aggregate principal amount |  | $ 825 | $ 825 | 0
Stated interest rate |  |  | 7.00% |
Repurchase price if triggering event occurs |  |  | 101.00% |
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% |
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc. |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
Aggregate principal amount |  |  | $ 189 | $ 829
Stated interest rate |  |  | 6.75% |
Amount of debt extinguished |  | $ 640 |  |
6.750% 2026 Senior Secured Notes | Cleveland-Cliffs Inc. | Subsequent Event |  |  |  |
Debt Instrument, Redemption [Line Items] |  |  |  |
Amount of debt extinguished | $ 189 |  |  |

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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//1943274/2147479853/942-210-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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