Quarterly report pursuant to Section 13 or 15(d)

ACQUISITIONS - ArcelorMittal USA Consideration (Details)

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ACQUISITIONS - ArcelorMittal USA Consideration (Details) - ArcelorMittal USA
$ / shares in Units, $ in Millions
Dec. 09, 2020
USD ($)
$ / shares
shares
Business Acquisition [Line Items]  
Fair value of settlement of a pre-existing relationship $ 237
Cash consideration 639
Consideration transferred 2,604
Cash consideration pursuant to the AM USA Transaction Agreement 505
Cash consideration for purchase of the remaining JV partner's interest of Kote and Tek 182
Total cash consideration receivable (48)
Accounts receivable 97
Freestanding derivative asset from customer supply agreement 140
Common Stock  
Business Acquisition [Line Items]  
Fair value of shares issued $ 990
Stock issued during period, shares, acquisitions (in shares) | shares 78,186,671
Price per share of Cliffs common shares (in dollars per share) | $ / shares $ 12.66
Series B Preferred Stock  
Business Acquisition [Line Items]  
Fair value of shares issued $ 738
Stock issued during period, shares, acquisitions (in shares) | shares 583,273
Price per share of Cliffs common shares (in dollars per share) | $ / shares $ 1,266