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DEBT AND CREDIT FACILITIES - Debt Issuances and Terms (Details) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) $ / shares | Dec. 31, 2018 | Jun. 19, 2020 USD ($) | Apr. 24, 2020 USD ($) | Apr. 17, 2020 USD ($) | Mar. 16, 2020 USD ($) | Mar. 13, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Par Value | $ 5,595 |  |  |  |  |  |  |
Common shares, par value | $ / shares | $ 0.125 |  |  |  |  |  |  |
AK Steel [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Par Value | $ 132 |  |  |  |  |  |  |
9.875% 2025 Senior Secured Notes | Cleveland-Cliffs Inc. [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Par Value | $ 955 |  |  | $ 555 | $ 400 |  |  |
Debt issuance, discount rate |  |  |  | 99.00% | 94.50% |  |  |
Repurchase price if triggering event occurs | 101.00% |  |  |  |  |  |  |
6.75% 2026 Senior Secured Notes | Cleveland-Cliffs Inc. [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Par Value | $ 845 |  | $ 120 |  |  |  | $ 725 |
Debt issuance, discount rate |  |  | 99.25% |  |  |  | 98.783% |
Repurchase price if triggering event occurs | 101.00% |  |  |  |  |  |  |
6.375% 2025 Senior Notes | Cleveland-Cliffs Inc. [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Par Value | $ 64 |  |  |  |  | $ 232 |  |
Repurchase price if triggering event occurs | 101.00% |  |  |  |  |  |  |
7.00% 2027 Senior Notes | Cleveland-Cliffs Inc. [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Par Value | $ 73 |  |  |  |  | $ 335 |  |
Repurchase price if triggering event occurs | 101.00% |  |  |  |  |  |  |
1.50% 2025 Convertible Senior Notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio | 129.2985 | 122.4365 |  |  |  |  |  |
Convertible debt, initial conversion price | $ / shares | $ 8.17 |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger, Five-Day Trading | 0.98 |  |  |  |  |  |  |
Convertible debt, equity component | $ 86 |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage | 100.00% |  |  |  |  |  |  |
1.50% 2025 Convertible Senior Notes | Minimum [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger | 130.00% |  |  |  |  |  |  |
1.50% 2025 Convertible Senior Notes | Cleveland-Cliffs Inc. [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Par Value | $ 296 |  |  |  |  |  |  | $ 316
5.875% 2027 Senior Notes | Cleveland-Cliffs Inc. [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Par Value | $ 556 |  |  |  |  |  |  | 750
Repurchase price if triggering event occurs | 101.00% |  |  |  |  |  |  |
6.25% 2040 Senior Notes | Cleveland-Cliffs Inc. [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Par Value | $ 263 |  |  |  |  |  |  | 298
Repurchase price if triggering event occurs | 101.00% |  |  |  |  |  |  |
5.75% 2025 Senior Notes | Cleveland-Cliffs Inc. [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Par Value | $ 396 |  |  |  |  |  |  | 473
Repurchase price if triggering event occurs | 101.00% |  |  |  |  |  |  |
4.875% 2024 Senior Secured Notes | Cleveland-Cliffs Inc. [Member] |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt Instrument, Par Value | $ 395 |  |  |  |  |  |  | $ 400
Repurchase price if triggering event occurs | 101.00% |  |  |  |  |  |  |

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