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Borrowings - Summary of Borrowings (Detail)
 12 Months Ended
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Disclosure of detailed information about borrowings [line items]        
Nominal value € 2,148,000,000      
Arrangement fees (32,000,000)      
Accrued interest 35,000,000      
Borrowings 2,151,000,000   € 2,127,000,000 € 2,468,000,000
Non-current 2,094,000,000   2,021,000,000  
Current € 57,000,000   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 € 349,000,000 $ 400,000,000    
Arrangement fees (4,000,000)      
Accrued interest 3,000,000      
Borrowings € 348,000,000   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 (2,000,000)      
Accrued interest 2,000,000      
Borrowings € 300,000,000   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 € 568,000,000 $ 650,000,000    
Arrangement fees (12,000,000)      
Accrued interest 12,000,000      
Borrowings € 568,000,000   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 € 437,000,000 $ 500,000,000    
Arrangement fees (7,000,000)      
Accrued interest 10,000,000      
Borrowings € 440,000,000   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 94,000,000      
Accrued interest 2,000,000      
Borrowings € 96,000,000   83,000,000  
Pan US ABL facility (due 2022) [member]        
Disclosure of detailed information about borrowings [line items]        
Nominal rate Floating      
Effective rate 4.51% 4.51%    
Borrowings     € 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