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DEBT AND CREDIT FACILITIES - Schedule Of Long-Term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 4,535 | $ 5,369
Unamortized discounts and issuance costs | (60) | (131)
Long-term Debt | 4,475 | 5,238
ABL Facility |  |
Debt Instrument [Line Items] |  |
Long-term Line of Credit | $ 2,090 |
Cleveland-Cliffs Inc. | 9.875% 2025 Senior Secured Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 9.875% |
Debt Instrument, Interest Rate, Effective Percentage | 10.57% |
Long-term Debt, Gross | $ 0 | 607
Cleveland-Cliffs Inc. | 6.750% 2026 Senior Secured Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 6.75% |
Debt Instrument, Interest Rate, Effective Percentage | 6.99% |
Long-term Debt, Gross | $ 829 | 845
Cleveland-Cliffs Inc. | 1.500% 2025 Convertible Senior Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 1.50% |
Debt Instrument, Interest Rate, Effective Percentage | 6.26% |
Long-term Debt, Gross | $ 0 | 294
Cleveland-Cliffs Inc. | 7.000% 2027 Senior Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 7.00% |
Debt Instrument, Interest Rate, Effective Percentage | 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% |
Debt Instrument, Interest Rate, Effective Percentage | 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% |
Debt Instrument, Interest Rate, Effective Percentage | 4.63% |
Long-term Debt, Gross | $ 370 | 500
Cleveland-Cliffs Inc. | 4.875% 2031 Senior Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 4.875% |
Debt Instrument, Interest Rate, Effective Percentage | 4.88% |
Long-term Debt, Gross | $ 326 | 500
Cleveland-Cliffs Inc. | 6.250% 2040 Senior Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 6.25% |
Debt Instrument, Interest Rate, Effective Percentage | 6.34% |
Long-term Debt, Gross | $ 235 | $ 263
Cleveland-Cliffs Inc. | ABL Facility |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Interest Rate, Effective Percentage | 4.23% | 1.87%
Long-term Line of Credit | $ 2,090 | $ 1,609
AK Steel | 7.000% 2027 AK Senior Notes |  |
Debt Instrument [Line Items] |  |
Stated interest rate | 7.00% |
Debt Instrument, Interest Rate, Effective Percentage | 9.24% |
Long-term Debt, Gross | $ 56 | 56
AK Steel | Industrial Revenue Bonds |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Gross | $ 0 | $ 66

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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