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DEBT AND CREDIT FACILITIES - Schedule Of Long-Term Debt (Details) - USD ($) $ in Millions | Apr. 14, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | $ 4,613 | $ 4,306
Unamortized discounts and issuance costs |  | (54) | (57)
Long-term Debt |  | 4,559 | 4,249
ABL Facility |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Line of Credit |  | $ 2,171 |
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 |  | 4.63% |
Long-term Debt, Gross |  | $ 368 | 368
Cleveland-Cliffs Inc. | 4.875% 2031 Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 4.875% |
Annual Effective Interest Rate |  | 4.88% |
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 |  | 6.40% | 5.60%
Long-term Line of Credit |  | $ 2,171 | $ 1,864
Cleveland-Cliffs Inc. | 6.750% 2030 Senior Notes | Subsequent Event |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 6.75% |  |
Long-term Debt, Gross | $ 750 |  |
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://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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