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DEBT AND CREDIT FACILITIES - Schedule Of Long-Term Debt (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Total Principal Amount | $ 5,514 |
Long-term Debt |  | $ 5,424
Long-term Debt, Current Maturities |  | 34
Total long-term debt | 5,368 | $ 5,390
ABL Facility |  |
Debt Instrument [Line Items] |  |
Long-term Line of Credit | 1,670 |
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 | 56 | $ 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%
Annual Effective Interest Rate | 10.57% | 10.57%
Total Principal Amount | $ 607 | $ 955
Unamortized Debt Issuance Costs | (4) | (8)
Unamortized (Discounts) | (15) | (25)
Long-term Debt | $ 588 | $ 922
Cleveland-Cliffs Inc. | 6.75% 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 | (18) | (20)
Unamortized (Discounts) | (8) | (9)
Long-term Debt | $ 819 | $ 816
Cleveland-Cliffs Inc. | 1.50% 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 | $ 296 | $ 296
Unamortized Debt Issuance Costs | (3) | (4)
Unamortized (Discounts) | (45) | (49)
Long-term Debt | $ 248 | $ 243
Cleveland-Cliffs Inc. | 7.00% 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) | (17) | (18)
Long-term Debt | $ 535 | $ 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 | (9) |
Unamortized (Discounts) | 0 |
Long-term Debt | $ 491 |
Cleveland-Cliffs Inc. | 6.25% 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 | 2.24% |
Long-term Line of Credit | $ 1,670 | $ 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. | 5.75% 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 | 7.00% 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 | 7.50% 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

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