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DEBT AND CREDIT FACILITIES - Schedule Of Long-Term Debt (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | $ 5,115 | $ 5,369 |
Unamortized discounts and issuance costs | (87) | (131) |
Long-term Debt | 5,028 | 5,238 |
ABL Facility |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Line of Credit | $ 1,715 |  |
Cleveland-Cliffs Inc. | 9.875% 2025 Senior Secured Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 9.875% |  | 9.875%
Debt Instrument, Interest Rate, Effective Percentage | 10.57% |  |
Long-term Debt, Gross | $ 607 | 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 | $ 845 | 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 | $ 500 | 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 | $ 500 | 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 | $ 263 | $ 263 |
Cleveland-Cliffs Inc. | ABL Facility |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 2.00% | 1.87% |
Long-term Line of Credit | $ 1,715 | $ 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 |

X
- 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 http://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 http://asc.fasb.org/extlink&oid=120400017&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 http://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 http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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