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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of condensed financial information of parent company [line items]      
Revenue € 5,686 € 5,237 € 4,743
Gross profit 538 555 535
Selling and administrative expenses (247) (247) (253)
Employee benefit expenses (927) (907) (876)
(Loss) / Income from operations 404 338 267
Financial result-net (149) (260) (188)
Income / (loss) before income tax 222 49 65
Income tax (expense) / benefit (32) (80) (69)
Net income / (loss) 190 (31) (4)
Other comprehensive (loss) / income 7 15 (30)
Total comprehensive income / (loss) 197 (16) (34)
Parent [member]      
Disclosure of condensed financial information of parent company [line items]      
Revenue 3 1 1
Gross profit 3 1 1
Selling and administrative expenses (15) (5) (8)
Employee benefit expenses (3) (1)  
Loss from recurring operations (15) (5) (7)
Other income 0 0 0
Other expense (3)    
(Loss) / Income from operations (18) (5) (7)
Financial result-net 80 (65) 1
Income / (loss) before income tax 62 (70) (6)
Income tax (expense) / benefit 25    
Net income / (loss) 87 (70) (6)
Other comprehensive (loss) / income 0 0 0
Total comprehensive income / (loss) € 87 € (70) € (6)