Quarterly report pursuant to Section 13 or 15(d)

EARNINGS PER SHARE - Earnings Per Share Computation (Details)

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EARNINGS PER SHARE - Earnings Per Share Computation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share [Abstract]    
Loss from continuing operations $ (53) $ (43)
Income attributable to noncontrolling interests (14) (15)
Net loss from continuing operations attributable to Cliffs shareholders (67) (58)
Income from discontinued operations, net of tax 0 1
Net loss attributable to Cliffs shareholders $ (67) $ (57)
Weighted average number of shares:    
Basic (in shares) 492 515
Employee stock plans (in shares) 0 0
Diluted (in shares) 492 515
Earnings per common share attributable to Cliffs shareholders - basic:    
Continuing operations (in dollars per share) $ (0.14) $ (0.11)
Discontinued operations (in dollars per share) 0 0
Earnings per Common Share - Basic (in dollars per share) (0.14) (0.11)
Earnings per common share attributable to Cliffs shareholders - diluted:    
Continuing operations (in dollars per share) (0.14) (0.11)
Discontinued operations (in dollars per share) 0 0
Earnings per Common Share - Diluted (in dollars per share) $ (0.14) $ (0.11)