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UNAUDITED INTERIM CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME / (LOSS) - EUR (€)
€ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Statement of comprehensive income [abstract]        
Net income / (loss) € 32 € (32) € 54 € 147
Items that will not be reclassified subsequently to the consolidated income statement        
Remeasurement on post-employment benefit obligations 5 79 4 155
Income tax on remeasurement on post-employment benefit obligations (3) (17) (2) (30)
Items that may be reclassified subsequently to the consolidated income statement        
Cash flow hedges 1 (13) 4 (15)
Income tax on cash flow hedges 0 3 (1) 4
Currency translation differences 0 31 (13) 42
Other comprehensive income / (loss) 3 83 (8) 156
Total comprehensive income 35 51 46 303
Attributable to:        
Equity holders of Constellium 34 49 44 299
Non-controlling interests 1 2 2 4
Total comprehensive income € 35 € 51 € 46 € 303