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CONSOLIDATED INCOME STATEMENT (unaudited) (Statement) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Income Statement [Abstract]    
Revenue $ 1,979 $ 1,880
Cost of sales (excluding depreciation and amortization) (1,716) (1,635)
Depreciation and amortization (78) (75)
Selling and administrative expenses (78) (80)
Research and development expenses (13) (15)
Other gains and losses - net (5) (18)
Finance costs - net (27) (27)
Income before tax 62 30
Income tax expense (24) (8)
Net income 38 22
Attributable to:    
Equity holders of Constellium 37 21
Non-controlling interests 1 1
Net income $ 38 $ 22
Earnings per share attributable to the equity holders of Constellium (in U.S. dollars)    
Basic earnings per share (in USD per share) $ 0.26 $ 0.14
Diluted earnings per share (in USD per share) $ 0.26 $ 0.14