Annual report pursuant to Section 13 and 15(d)

ACQUISITIONS - Pro Forma (Details)

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ACQUISITIONS - Pro Forma (Details) - Ferrous Processing and Trading
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]  
Revenues $ 21,701
Net income attributable to Cliffs shareholders $ 3,074