Quarterly report pursuant to Section 13 or 15(d)

EARNINGS PER SHARE - Earnings Per Share Computation (Details)

v3.21.2
EARNINGS PER SHARE - Earnings Per Share Computation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Income (loss) from continuing operations $ 794 $ (107) $ 851 $ (157)
Income attributable to noncontrolling interest (15) (16) (31) (19)
Net income (loss) from continuing operations attributable to Cliffs shareholders 779 (123) 820 (176)
Income (loss) from discontinued operations, net of tax 1 (1) 1 0
Net income (loss) attributable to Cliffs shareholders $ 780 $ (124) $ 821 $ (176)
Weighted average number of shares:        
Basic (in shares) 500 399 495 348
Redeemable preferred shares (in shares) 58 0 58 0
Convertible senior notes (in shares) 22 0 21 0
Employee stock plans (in shares) 5 0 5 0
Diluted (in shares) 585 399 579 348
Earnings Per Share, Basic [Abstract]        
Continuing operations (in dollars per share) $ 1.40 $ (0.31) $ 1.48 $ (0.51)
Discontinued operations (in dollars per share) 0 0 0 0
Earnings (Loss) per Common Share - Basic (in dollars per share) 1.40 (0.31) 1.48 (0.51)
Earnings Per Share, Diluted [Abstract]        
Continuing operations (in dollars per share) 1.33 (0.31) 1.42 (0.51)
Discontinued operations (in dollars per share) 0 0 0 0
Earnings (Loss) per Common Share - Diluted (in dollars per share) $ 1.33 $ (0.31) $ 1.42 $ (0.51)
Undistributed Earnings (Loss) Available to Common Shareholders, Basic $ 82   $ 86