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Parent Company - Statement of Comprehensive Income / (Loss) of Constellium N.V. (Parent Company Only) (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of condensed financial information of parent company [Line Items]      
Revenue € 5,237 € 4,743 € 5,153
Gross profit 539 516 450
Selling and administrative expenses (248) (254) (245)
Employee benefit expenses (924) (897) (887)
Income / (loss) from operations 321 246 (426)
Financial result-net (243) (167) (155)
Income / (loss) before income tax 49 65 (584)
Income tax (80) (69) 32
Net loss (31) (4) (552)
Other comprehensive income 15 (30) 41
Total comprehensive loss (16) (34) (511)
Parent [member]      
Disclosure of condensed financial information of parent company [Line Items]      
Revenue 1 1  
Gross profit 1 1  
Selling and administrative expenses (5) (8) (7)
Employee benefit expenses (1)    
Loss from recurring operations (5) (7) (7)
Other income     1
Other expenses     (3)
Income / (loss) from operations (5) (7) (9)
Financial result-net (65) 1 9
Income / (loss) before income tax (70) (6)  
Income tax 0 0 0
Net loss (70) (6)  
Other comprehensive income 0 0 € 0
Total comprehensive loss € (70) € (6)