Annual report [Section 13 and 15(d), not S-K Item 405]

EARNINGS PER SHARE - Earnings Per Share Computation (Details)

v3.25.0.1
EARNINGS PER SHARE - Earnings Per Share Computation (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share [Abstract]      
Income (loss) from continuing operations $ (708) $ 449 $ 1,373
Income from continuing operations attributable to noncontrolling interest 46 51 41
Net income (loss) from continuing operations attributable to Cliffs shareholders (754) 398 1,332
Income from discontinued operations, net of tax 0 1 3
Net income (loss) attributable to Cliffs shareholders $ (754) $ 399 $ 1,335
Weighted average number of shares:      
Basic (in shares) 480 510 519
Convertible senior notes (in shares) 0 0 2
Employee stock plans (in shares) 0 1 3
Diluted (in shares) 480 511 524
Earnings per common share attributable to Cliffs common shareholders - basic      
Continuing operations (in dollars per share) $ (1.57) $ 0.78 $ 2.57
Discontinued operations (in dollars per share) 0 0 0
Earnings (loss) per common share attributable to Cliffs common shareholders - basic (in dollars per share) (1.57) 0.78 2.57
Earnings (loss) per common share attributable to Cliffs common shareholders - diluted:      
Continuing operations (in dollars per share) (1.57) 0.78 2.55
Discontinued operations (in dollars per share) 0 0 0
Earnings (loss) per common share attributable to Cliffs common shareholders - diluted (in dollars per share) $ (1.57) $ 0.78 $ 2.55