Quarterly report [Sections 13 or 15(d)]

EARNINGS PER SHARE - Earnings Per Share Computation (Details)

v3.25.3
EARNINGS PER SHARE - Earnings Per Share Computation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Loss from continuing operations $ (231) $ (232) $ (1,190) $ (280)
Net income attributable to noncontrolling interests (17) (12) (42) (33)
Loss from continuing operations (248) (244) (1,232) (313)
Loss from discontinued operations, net of tax (3) 0 (3) 0
Net loss $ (251) $ (244) $ (1,235) $ (313)
Weighted average number of shares:        
Basic (in shares) 495 468 495 478
Employee stock plans (in shares) 0 0 0 0
Diluted (in shares) 495 468 495 478
Earnings Per Share, Basic [Abstract]        
Continuing operations $ (0.51) $ (0.52) $ (2.49) $ (0.66)
Discontinued operations 0 0 0 0
Earnings Per Share, Basic, Total (0.51) (0.52) (2.49) (0.66)
Loss per common share attributable to Cliffs shareholders - diluted        
Continuing operations (0.51) (0.52) (2.49) (0.66)
Discontinued operations 0 0 0 0
Earnings Per Share, Diluted, Total $ (0.51) $ (0.52) $ (2.49) $ (0.66)