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DEBT AND CREDIT FACILITIES - Schedule Of Long-Term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020 | Apr. 24, 2020 | Mar. 13, 2020
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total Principal Amount | $ 5,514 |  |  |
Long-term Debt |  | $ 5,424 |  |
Debt, Long-term and Short-term, Combined Amount | 5,376 |  |  |
Long-term Debt, Current Maturities | 26 | 34 |  |
Total long-term debt | 5,350 | $ 5,390 |  |
ABL Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Line of Credit | 1,673 |  |  |
Maximum borrowing capacity | 3,500 |  |  |
Cleveland-Cliffs Inc. |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Annual Effective Interest Rate |  | 3.25% |  |
Cleveland-Cliffs Inc. | EDC Revolving Facilities - outstanding balance |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Line of Credit | 55 | $ 18 |  |
Maximum borrowing capacity | 80 | $ 40 |  |
Cleveland-Cliffs Inc. | ABL Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Annual Effective Interest Rate |  | 2.15% |  |
Maximum borrowing capacity | $ 3,500 | $ 3,500 |  |
Cleveland-Cliffs Inc. | 9.875% 2025 Senior Secured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 9.875% | 9.875% | 9.875% |
Annual Effective Interest Rate | 10.57% | 10.57% |  |
Total Principal Amount | $ 607 | $ 955 |  |
Unamortized Debt Issuance Costs | (4) | (8) |  |
Unamortized (Discounts) | (14) | (25) |  |
Long-term Debt | $ 589 | $ 922 |  |
Cleveland-Cliffs Inc. | 6.750% 2026 Senior Secured Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 6.75% | 6.75% |  |
Annual Effective Interest Rate | 6.99% | 6.99% |  |
Total Principal Amount | $ 845 | $ 845 |  |
Unamortized Debt Issuance Costs | (16) | (20) |  |
Unamortized (Discounts) | (8) | (9) |  |
Long-term Debt | $ 821 | $ 816 |  |
Cleveland-Cliffs Inc. | 1.500% 2025 Convertible Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 1.50% | 1.50% |  |
Annual Effective Interest Rate | 6.26% | 6.26% |  |
Total Principal Amount | $ 294 | $ 296 |  |
Unamortized Debt Issuance Costs | (3) | (4) |  |
Unamortized (Discounts) | (42) | (49) |  |
Long-term Debt | $ 249 | $ 243 |  |
Cleveland-Cliffs Inc. | 7.000% 2027 Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 7.00% | 7.00% |  |
Annual Effective Interest Rate | 9.24% | 9.24% |  |
Total Principal Amount | $ 73 | $ 73 |  |
Unamortized Debt Issuance Costs | 0 | 0 |  |
Unamortized (Discounts) | (7) | (8) |  |
Long-term Debt | $ 66 | $ 65 |  |
Cleveland-Cliffs Inc. | 5.875% 2027 Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 5.875% | 5.875% |  |
Annual Effective Interest Rate | 6.49% | 6.49% |  |
Total Principal Amount | $ 556 | $ 556 |  |
Unamortized Debt Issuance Costs | (4) | (4) |  |
Unamortized (Discounts) | (16) | (18) |  |
Long-term Debt | $ 536 | $ 534 |  |
Cleveland-Cliffs Inc. | 4.625% 2029 Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.625% |  |  |
Annual Effective Interest Rate | 4.63% |  |  |
Total Principal Amount | $ 500 |  |  |
Unamortized Debt Issuance Costs | (8) |  |  |
Unamortized (Discounts) | 0 |  |  |
Long-term Debt | $ 492 |  |  |
Cleveland-Cliffs Inc. | 4.875% 2031 Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 4.875% |  |  |
Annual Effective Interest Rate | 4.88% |  |  |
Total Principal Amount | $ 500 |  |  |
Unamortized Debt Issuance Costs | (8) |  |  |
Unamortized (Discounts) | 0 |  |  |
Long-term Debt | $ 492 |  |  |
Cleveland-Cliffs Inc. | 6.250% 2040 Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 6.25% | 6.25% |  |
Annual Effective Interest Rate | 6.34% | 6.34% |  |
Total Principal Amount | $ 263 | $ 263 |  |
Unamortized Debt Issuance Costs | (2) | (2) |  |
Unamortized (Discounts) | (3) | (3) |  |
Long-term Debt | $ 258 | 258 |  |
Cleveland-Cliffs Inc. | ABL Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Annual Effective Interest Rate | 2.23% |  |  |
Long-term Line of Credit | $ 1,673 | $ 1,510 |  |
Cleveland-Cliffs Inc. | 4.875% 2024 Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate |  | 4.875% |  |
Annual Effective Interest Rate |  | 5.00% |  |
Total Principal Amount |  | $ 395 |  |
Unamortized Debt Issuance Costs |  | (3) |  |
Unamortized (Discounts) |  | (1) |  |
Long-term Debt |  | $ 391 |  |
Cleveland-Cliffs Inc. | 6.375% 2025 Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate |  | 6.375% |  |
Annual Effective Interest Rate |  | 8.11% |  |
Total Principal Amount |  | $ 64 |  |
Unamortized Debt Issuance Costs |  | 0 |  |
Unamortized (Discounts) |  | (4) |  |
Long-term Debt |  | $ 60 |  |
Cleveland-Cliffs Inc. | 5.750% 2025 Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate |  | 5.75% |  |
Annual Effective Interest Rate |  | 6.01% |  |
Total Principal Amount |  | $ 396 |  |
Unamortized Debt Issuance Costs |  | (3) |  |
Unamortized (Discounts) |  | (4) |  |
Long-term Debt |  | 389 |  |
AK Steel | Industrial Revenue Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total Principal Amount |  | 92 |  |
Unamortized Debt Issuance Costs |  | 0 |  |
Unamortized Premiums |  | 2 |  |
Long-term Debt |  | $ 94 |  |
AK Steel | Industrial Revenue Bonds due 2024 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term Debt, Current Maturities | $ 26 |  |  |
AK Steel | 7.000% 2027 AK Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate | 7.00% | 7.00% |  |
Annual Effective Interest Rate | 9.24% | 9.24% |  |
Total Principal Amount | $ 56 | $ 56 |  |
Unamortized Debt Issuance Costs | 0 | 0 |  |
Unamortized (Discounts) | (5) | (6) |  |
Long-term Debt | 51 | $ 50 |  |
AK Steel | Industrial Revenue Bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total Principal Amount | 92 |  |  |
Unamortized Debt Issuance Costs | 0 |  |  |
Unamortized Premiums | 2 |  |  |
Long-term Debt | $ 94 |  |  |
AK Steel | 7.625% 2021 AK Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate |  |  |  | 7.625%
Annual Effective Interest Rate |  | 7.33% |  |
Total Principal Amount |  | $ 34 |  |
Unamortized Debt Issuance Costs |  | 0 |  |
Unamortized (Discounts) |  | 0 |  |
Long-term Debt |  | $ 34 |  |
AK Steel | 7.500% Senior Secured Notes due July 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate |  |  |  | 7.50%
Annual Effective Interest Rate |  | 6.17% |  |
Total Principal Amount |  | $ 13 |  |
Unamortized Debt Issuance Costs |  | 0 |  |
Unamortized (Discounts) |  | 0 |  |
Long-term Debt |  | $ 13 |  |
AK Steel | 6.375% 2025 AK Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Stated interest rate |  | 6.375% |  |
Annual Effective Interest Rate |  | 8.11% |  |
Total Principal Amount |  | $ 29 |  |
Unamortized Debt Issuance Costs |  | 0 |  |
Unamortized (Discounts) |  | (2) |  |
Long-term Debt |  | $ 27 |  |

X
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