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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (unaudited) (Statement) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Statement of Comprehensive Income [Abstract]    
Net income $ 38 $ 22
Other comprehensive income / (loss)    
Net change in post-employment benefit obligations (3) (5)
Income tax on net change in post-employment benefit obligations 1 2
Net change in cash flow hedges 12 (2)
Income tax on cash flow hedges (3) 0
Currency translation differences 4 (6)
Other comprehensive income / (loss) 11 (11)
Total comprehensive income / (loss) 49 11
Attributable to:    
Equity holders of Constellium 48 10
Non-controlling interests 1 1
Total comprehensive income $ 49 $ 11