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Unaudited Interim Consolidated Statement of Comprehensive Income / (Loss) - EUR (€)
€ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Statement of comprehensive income [abstract]        
Net income € 55 € 15 € 31 € 28
Items that will not be reclassified subsequently to the consolidated income statement        
Remeasurement on post-employment benefit obligations 2 8 27 17
Income tax on remeasurement on post-employment benefit obligations (1)   (7) (2)
Items that may be reclassified subsequently to the consolidated income statement        
Cash flow hedge (23) 24 (14) 29
Income tax on cash flow hedge 8 (7) 5 (9)
Currency translation differences 4 (11) 1 (13)
Other comprehensive (loss) / income (10) 14 12 22
Total comprehensive income 45 29 43 50
Attributable to:        
Equity holders of Constellium 45 30 43 51
Non-controlling interests   (1)   (1)
Total comprehensive income € 45 € 29 € 43 € 50