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Consolidated Statement of Comprehensive Income / (Loss) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Statement of comprehensive income [abstract]      
Net loss € (31) € (4) € (552)
Items that will not be reclassified subsequently to the consolidated Income Statement      
Remeasurement on post-employment benefit obligations 12 (20) (7)
Income tax on remeasurement on post-employment benefit obligations (8) 2 20
Cash flow hedge [1]     (9)
Income tax on cash flow hedge     3
Items that may be reclassified subsequently to the consolidated Income Statement      
Cash flow hedge [2] 46 (27)  
Income tax on cash flow hedge (15) 9  
Currency translation differences (20) 6 34
Other comprehensive income / (loss) 15 (30) 41
Total comprehensive loss (16) (34) (511)
Attributable to:      
Equity holders of Constellium (15) (34) (513)
Non-controlling interests (1)   2
Total comprehensive loss € (16) € (34) € (511)
[1] Relates to foreign currency hedging of the estimated U.S. Dollar Wise acquisition price
[2] Relates to foreign currency hedging of certain forecasted sales in U.S. Dollar