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ACQUISITIONS - Pro Forma (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
ArcelorMittal USA and AK Steel |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Revenues, pro forma |  | $ 12,837
Net income (loss) attributable to Cliffs shareholders, pro forma |  | (520)
Expenses, pro forma |  | $ 32
Statutory tax rate, pro forma |  | 24.30%
Income tax benefit (expense), pro forma |  | $ 170
ArcelorMittal USA and AK Steel | Intersegment Eliminations |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Revenues, pro forma |  | 844
Ferrous Processing and Trading |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Revenues, pro forma | $ 21,701 | 13,549
Net income (loss) attributable to Cliffs shareholders, pro forma | $ 3,074 | (526)
Franchise | ArcelorMittal USA and AK Steel |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Net income (loss) attributable to Cliffs shareholders, pro forma |  | 140
Fair Value Adjustment to Inventory | ArcelorMittal USA and AK Steel |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Net income (loss) attributable to Cliffs shareholders, pro forma |  | 96
Acquisition-related costs | ArcelorMittal USA and AK Steel |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Net income (loss) attributable to Cliffs shareholders, pro forma |  | 93
Restructuring Costs | ArcelorMittal USA |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Net income (loss) attributable to Cliffs shareholders, pro forma |  | $ 1,820

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