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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME / (LOSS) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of comprehensive income [abstract]      
Net (loss) / income € (17) € 64 € 190
Items that will not be reclassified subsequently to the consolidated income statement      
Remeasurement on post-employment benefit obligations (20) (61) 24
Income tax on remeasurement on post-employment benefit obligations 5 13 (6)
Items that may be reclassified subsequently to the consolidated income statement      
Cash flow hedges 26 (8) (25)
Net investment hedges 0 4 (4)
Income tax on hedges (7) 2 8
Currency translation differences (18) 1 10
Other comprehensive (loss) / income (14) (49) 7
Total comprehensive (loss) / income (31) 15 197
Attributable to:      
Equity holders of Constellium (34) 10 195
Non-controlling interests 3 5 2
Total comprehensive (loss) / income € (31) € 15 € 197