Annual report pursuant to Section 13 and 15(d)

EARNINGS PER SHARE - Earnings Per Share Computation (Details)

v3.22.0.1
EARNINGS PER SHARE - Earnings Per Share Computation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Earnings Per Share [Abstract]      
Income (loss) from continuing operations $ 3,030 $ (82) $ 295
Income from continuing operations attributable to noncontrolling interest 45 41 0
Net income (loss) from continuing operations attributable to Cliffs shareholders 2,985 (123) 295
Income (loss) from discontinued operations, net of tax 3 1 (2)
Net income (loss) attributable to Cliffs shareholders $ 2,988 $ (122) $ 293
Weighted average number of shares:      
Basic (in shares) 498 379 277
Redeemable preferred shares (in shares) 33 0 0
Convertible senior notes (in shares) 22 0 4
Employee stock plans (in shares) 5 0 3
Diluted (in shares) 558 379 284
Earnings (loss) per common share attributable to Cliffs common shareholders - basic1:      
Continuing operations (in dollars per share) $ 5.62 $ (0.32) $ 1.07
Discontinued operations (in dollars per share) 0.01 0 (0.01)
Earnings (loss) per common share attributable to Cliffs common shareholders - basic (in dollars per share) 5.63 (0.32) 1.06
Earnings (loss) per common share attributable to Cliffs common shareholders - diluted:      
Continuing operations (in dollars per share) 5.35 (0.32) 1.04
Discontinued operations (in dollars per share) 0.01 0 (0.01)
Earnings (loss) per common share attributable to Cliffs common shareholders - diluted (in dollars per share) $ 5.36 $ (0.32) $ 1.03
Earnings attributed to Series B Participating Redeemable Preferred Stock $ 187