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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Statement of comprehensive income [abstract]      
Net income € 129 € 308 € 262
Items that will not be reclassified subsequently to the consolidated income statement      
Remeasurement on post-employment benefit obligations (16) 157 114
Income tax on remeasurement on post-employment benefit obligations 2 (35) (16)
Items that may be reclassified subsequently to the consolidated income statement      
Cash flow hedges 7 (8) (17)
Income tax on cash flow hedges (1) 2 4
Currency translation differences (26) 21 34
Other comprehensive (loss) / income (34) 137 119
Total comprehensive income 95 445 381
Attributable to:      
Equity holders of Constellium 92 439 374
Non-controlling interests 3 6 7
Total comprehensive income € 95 € 445 € 381