Quarterly report pursuant to Section 13 or 15(d)

EARNINGS PER SHARE - Earnings Per Share Computation (Details)

v3.21.1
EARNINGS PER SHARE - Earnings Per Share Computation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]    
Income (loss) from continuing operations $ 57 $ (50)
Income attributable to noncontrolling interest (16) (3)
Net income (loss) from continuing operations attributable to Cliffs shareholders 41 (53)
Income from discontinued operations, net of tax 0 1
Net income (loss) attributable to Cliffs shareholders $ 41 $ (52)
Weighted average number of shares:    
Basic (in shares) 490 298
Redeemable preferred shares (in shares) 58 0
Convertible senior notes (in shares) 19 0
Employee stock plans (in shares) 4 0
Diluted (in shares) 571 298
Earnings Per Share, Basic [Abstract]    
Continuing operations (in dollars per share) $ 0.08 $ (0.18)
Discontinued operations (in dollars per share) 0 0
Earnings (Loss) per Common Share - Basic (in dollars per share) 0.08 (0.18)
Earnings Per Share, Diluted [Abstract]    
Continuing operations (in dollars per share) 0.07 (0.18)
Discontinued operations (in dollars per share) 0 0
Earnings (Loss) per Common Share - Diluted (in dollars per share) $ 0.07 $ (0.18)
Undistributed Earnings (Loss) Available to Common Shareholders, Basic $ 4