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Quarterly report pursuant to Section 13 or 15(d)

ACQUISITIONS - AK Steel Consideration (Details)

v3.21.2
ACQUISITIONS - AK Steel Consideration (Details)
$ / shares in Units, $ in Millions
6 Months Ended
Mar. 13, 2020
USD ($)
$ / shares
shares
Jun. 30, 2021
shares
Mar. 31, 2021
shares
Dec. 31, 2020
shares
Jun. 30, 2020
shares
Mar. 31, 2020
shares
Dec. 31, 2019
shares
Business Acquisition [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Common shares, outstanding (in shares) | shares Ìý 499,701,762 Ìý 477,517,372 Ìý Ìý Ìý
AK Steel Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Business Acquisition [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Fair value of debt included in consideration $ 914 Ìý Ìý Ìý Ìý Ìý Ìý
Fair value of Cliffs common shares issued for AK Steel outstanding common stock 618 Ìý Ìý Ìý Ìý Ìý Ìý
Other 3 Ìý Ìý Ìý Ìý Ìý Ìý
Consideration transferred $ 1,535 Ìý Ìý Ìý Ìý Ìý Ìý
Common shares, outstanding (in shares) | shares 317,000,000 Ìý Ìý Ìý Ìý Ìý Ìý
Exchange ratio 0.400 Ìý Ìý Ìý Ìý Ìý Ìý
Shares of Cliffs common shares issued to AK Steel stockholders (in shares) | shares 127,000,000 Ìý Ìý Ìý Ìý Ìý Ìý
Price per share of Cliffs common shares (in dollars per share) | $ / shares $ 4.87 Ìý Ìý Ìý Ìý Ìý Ìý
ABL Facility | AK Steel Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Business Acquisition [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Fair value of debt included in consideration $ 590 Ìý Ìý Ìý Ìý Ìý Ìý
7.50% Senior Secured Notes due July 2023 | AK Steel Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Business Acquisition [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Fair value of debt included in consideration 324 Ìý Ìý Ìý Ìý Ìý Ìý
Common Stock Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Business Acquisition [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Common shares, outstanding (in shares) | shares Ìý 500,000,000 499,000,000 478,000,000 399,000,000 399,000,000 271,000,000
Common Stock | AK Steel Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Business Acquisition [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Fair value of Cliffs common shares issued for AK Steel outstanding common stock $ 618 Ìý Ìý Ìý Ìý Ìý Ìý
Common Stock | AK Steel Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Business Acquisition [Line Items] Ìý Ìý Ìý Ìý Ìý Ìý Ìý
Exchange ratio Ìý 0.400 Ìý Ìý Ìý Ìý Ìý