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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement of Comprehensive Income [Abstract]      
Net income $ 60 $ 157 $ 315
Other comprehensive (loss) / income      
Net change in post-employment benefit obligations 6 (41) 208
Income tax on net change in post-employment benefit obligations (2) 6 (47)
Cash flow hedges (12) 7 (8)
Income tax on cash flow hedges 3 (2) 2
Currency translation differences (10) (6) 2
Other comprehensive (loss) / income (15) (36) 157
Total comprehensive income / (loss) 45 121 472
Attributable to :      
Equity holders of Constellium 42 116 467
Non-controlling interests 3 5 5
Total comprehensive income / (loss) $ 45 $ 121 $ 472