DEBT AND CREDIT FACILITIES - Other Financing Arrangements (Details) - USD ($) $ in Millions |
Dec. 31, 2021 |
Dec. 31, 2020 |
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| Debt Instrument [Line Items] | Ìý | Ìý |
| Aggregate principal amount | $ 5,369 | Ìý |
| AK Steel | Ìý | Ìý |
| Debt Instrument [Line Items] | Ìý | Ìý |
| Aggregate principal amount | 56 | Ìý |
| AK Steel | Industrial Revenue Bonds | Ìý | Ìý |
| Debt Instrument [Line Items] | Ìý | Ìý |
| Aggregate principal amount | $ 66 | $ 92 |
| Weighted average fixed rate | 6.86% | Ìý |
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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. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Weighted average interest rate of debt outstanding. No definition available.
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