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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 - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Dec. 09, 2020
Jun. 30, 2021
Business Acquisition [Line Items] Ìý Ìý
Fair value of settlement of a pre-existing relationship $ 237 Ìý
Cash consideration 639 Ìý
Consideration transferred 2,604 Ìý
Cash consideration pursuant to the AM USA Transaction Agreement 505 Ìý
Cash consideration for purchase of the remaining JV partner's interest of Kote and Tek 182 Ìý
Total cash consideration receivable (48) Ìý
Accounts receivable 97 Ìý
Freestanding derivative asset from customer supply agreement 140 Ìý
Common Stock Ìý Ìý
Business Acquisition [Line Items] Ìý Ìý
Fair value of shares issued $ 990 Ìý
Stock issued during period, shares, acquisitions (in shares) 78,186,671 Ìý
Price per share of Cliffs common shares (in dollars per share) $ 12.66 Ìý
Series B Preferred Stock Ìý Ìý
Business Acquisition [Line Items] Ìý Ìý
Fair value of shares issued $ 738 Ìý
Stock issued during period, shares, acquisitions (in shares) 583,273 583,273
Price per share of Cliffs common shares (in dollars per share) $ 1,266 Ìý