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Borrowings - Summary of Borrowings (Detail)
 6 Months Ended
Jun. 30, 2018
EUR (€)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
EUR (€)
Disclosure of detailed information about borrowings [line items]          
Nominal value € 2,183,000,000        
Arrangement fees (34,000,000)        
Accrued interest 35,000,000        
Borrowings 2,184,000,000   € 2,127,000,000   € 2,468,000,000
Non-current 2,054,000,000   2,021,000,000    
Current € 130,000,000   106,000,000    
Constellium N.V. senior unsecured notes (Issued May 2014, due 2024) [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal rate 5.75%        
Effective rate 6.26% 6.26%      
Nominal value € 343,000,000 $ 400,000,000      
Arrangement fees (4,000,000)        
Accrued interest 2,000,000        
Borrowings € 341,000,000   332,000,000    
Constellium N.V. senior unsecured notes (Issued May 2014, due 2021) [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal rate 4.63%        
Effective rate 5.16% 5.16%      
Nominal value € 300,000,000        
Arrangement fees (3,000,000)        
Accrued interest 2,000,000        
Borrowings € 299,000,000   298,000,000    
Constellium N.V. Senior Unsecured Notes (Issued February 2017, due 2025) [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal rate 6.63%        
Effective rate 7.13% 7.13%      
Nominal value € 558,000,000 $ 650,000,000      
Arrangement fees (12,000,000)        
Accrued interest 12,000,000        
Borrowings € 558,000,000   541,000,000    
Constellium N.V. USD Senior Unsecured Notes (Issued November 2017, due 2026) [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal rate 5.88%        
Effective rate 6.26% 6.26%      
Nominal value € 429,000,000 $ 500,000,000      
Arrangement fees (8,000,000)        
Accrued interest 10,000,000        
Borrowings € 431,000,000   413,000,000    
Constellium N.V. EURO Senior Unsecured Notes (Issued November 2017, due 2026) [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal rate 4.25%        
Effective rate 4.57% 4.57%      
Nominal value € 400,000,000        
Arrangement fees (7,000,000)        
Accrued interest 6,000,000        
Borrowings 399,000,000   395,000,000    
Other loans [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal value 76,000,000        
Accrued interest 3,000,000        
Borrowings € 79,000,000   € 83,000,000    
Pan US ABL facility (due 2022) [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal rate Floating        
Effective rate 4.32% 4.32%      
Nominal value € 77,000,000 $ 90,000,000      
Borrowings € 77,000,000     $ 65,000,000  
Secured inventory based facility (due 2019) [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal rate Floating        
Unsecured revolving credit facilities (due 2021) [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal rate Floating