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EARNINGS PER SHARE - Earnings Per Share Computation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Earnings Per Share [Abstract]      
Income (loss) from continuing operations $ 1,373 $ 3,030 $ (82)
Income from continuing operations attributable to noncontrolling interest 41 45 41
Net income (loss) from continuing operations attributable to Cliffs shareholders 1,332 2,985 (123)
Income from discontinued operations, net of tax 3 3 1
Net income (loss) attributable to Cliffs shareholders $ 1,335 $ 2,988 $ (122)
Weighted average number of shares:      
Basic (in shares) 519 498 379
Redeemable preferred shares (in shares) 0 33 0
Convertible senior notes (in shares) 2 22 0
Employee stock plans (in shares) 3 5 0
Diluted (in shares) 524 558 379
Earnings (loss) per common share attributable to Cliffs common shareholders - basic2:      
Continuing operations (in dollars per share) $ 2.57 $ 5.62 $ (0.32)
Discontinued operations (in dollars per share) 0 0.01 0
Earnings (loss) per common share attributable to Cliffs common shareholders - basic (in dollars per share) 2.57 5.63 (0.32)
Earnings (loss) per common share attributable to Cliffs common shareholders - diluted:      
Continuing operations (in dollars per share) 2.55 5.35 (0.32)
Discontinued operations (in dollars per share) 0 0.01 0
Earnings (loss) per common share attributable to Cliffs common shareholders - diluted (in dollars per share) $ 2.55 $ 5.36 $ (0.32)
Earnings attributed to Series B Participating Redeemable Preferred Stock $ 187