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DEBT AND CREDIT FACILITIES - Schedule Of Long-Term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2023 | Apr. 14, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 3,517 |  | $ 4,306
Unamortized discounts and issuance costs | (59) |  | (57)
Long-term Debt | 3,458 |  | 4,249
ABL Facility |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Line of Credit | $ 325 |  |
Cleveland-Cliffs Inc. | 6.750% 2026 Senior Secured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 6.75% |  |
Annual Effective Interest Rate | 6.99% |  |
Long-term Debt, Gross | $ 829 |  | 829
Cleveland-Cliffs Inc. | 7.000% 2027 Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 7.00% |  |
Annual Effective Interest Rate | 9.24% |  |
Long-term Debt, Gross | $ 73 |  | 73
Cleveland-Cliffs Inc. | 5.875% 2027 Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.875% |  |
Annual Effective Interest Rate | 6.49% |  |
Long-term Debt, Gross | $ 556 |  | 556
Cleveland-Cliffs Inc. | 4.625% 2029 Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 4.625% |  |
Annual Effective Interest Rate | 4.625% |  |
Long-term Debt, Gross | $ 368 |  | 368
Cleveland-Cliffs Inc. | 6.750% 2030 Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 6.75% |  |
Annual Effective Interest Rate | 6.75% |  |
Long-term Debt, Gross | $ 750 | $ 750 | 0
Cleveland-Cliffs Inc. | 4.875% 2031 Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 4.875% |  |
Annual Effective Interest Rate | 4.875% |  |
Long-term Debt, Gross | $ 325 |  | 325
Cleveland-Cliffs Inc. | 6.250% 2040 Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 6.25% |  |
Annual Effective Interest Rate | 6.34% |  |
Long-term Debt, Gross | $ 235 |  | $ 235
Cleveland-Cliffs Inc. | ABL Facility |  |  |
Debt Instrument [Line Items] |  |  |
Annual Effective Interest Rate | 7.148% |  | 5.602%
Long-term Line of Credit | $ 325 |  | $ 1,864
AK Steel | 7.000% 2027 AK Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 7.00% |  |
Annual Effective Interest Rate | 9.24% |  |
Long-term Debt, Gross | $ 56 |  | $ 56

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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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