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Borrowings - Summary of Borrowings (Detail)
 12 Months Ended
Nov. 09, 2017
Feb. 16, 2017
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
EUR (€)
Dec. 31, 2015
EUR (€)
Disclosure of detailed information about borrowings [line items]            
Nominal Value     € 2,140,000,000      
Arrangement fees     (36,000,000)      
Accrued interest     23,000,000      
Borrowings     2,127,000,000   € 2,468,000,000 € 2,233,000,000
Nominal rate   6.625%        
Non-current     2,021,000,000   2,361,000,000  
Current     106,000,000   107,000,000  
Pan US ABL facility (due 2022) [member]            
Disclosure of detailed information about borrowings [line items]            
Nominal Value     € 65,000,000 $ 78,000,000    
Nominal rate     Floating      
Effective rate     3.79% 3.79%    
Borrowings     € 65,000,000      
Constellium N.V. USD Senior Unsecured Notes (Issued November 2017, due 2026) [member]            
Disclosure of detailed information about borrowings [line items]            
Nominal Value     € 417,000,000 $ 500,000,000    
Effective rate     6.26% 6.26%    
Arrangement fees     € (8,000,000)      
Accrued interest     4,000,000      
Borrowings     € 413,000,000      
Nominal rate 5.875%   5.88%      
Constellium N.V. EURO Senior Unsecured Notes (Issued November 2017, due 2026) [member]            
Disclosure of detailed information about borrowings [line items]            
Nominal Value     € 400,000,000      
Effective rate     4.57% 4.57%    
Arrangement fees     € (7,000,000)      
Accrued interest     2,000,000      
Borrowings     € 395,000,000      
Nominal rate 4.25%   4.25%      
Constellium N.V.senior secured notes (Issued March 2016, due 2021) [member]            
Disclosure of detailed information about borrowings [line items]            
Nominal Value | $       $ 425,000,000    
Effective rate     8.94% 8.94%    
Borrowings         401,000,000  
Nominal rate     7.88%      
Muscle Shoals senior secured notes [member]            
Disclosure of detailed information about borrowings [line items]            
Nominal Value | $       $ 650,000,000    
Effective rate     7.45% 7.45%    
Borrowings         635,000,000  
Nominal rate     8.75%      
Constellium N.V. senior unsecured notes (Issued May 2014, due 2024) [member]            
Disclosure of detailed information about borrowings [line items]            
Nominal Value     € 334,000,000 $ 400,000,000    
Effective rate     6.26% 6.26%    
Arrangement fees     € (4,000,000)      
Accrued interest     2,000,000      
Borrowings     € 332,000,000   377,000,000  
Nominal rate     5.75%      
Constellium N.V. senior unsecured notes (Issued May 2014, due 2021) [member]            
Disclosure of detailed information about borrowings [line items]            
Nominal Value     € 300,000,000      
Effective rate     5.16% 5.16%    
Arrangement fees     € (4,000,000)      
Accrued interest     2,000,000      
Borrowings     € 298,000,000   298,000,000  
Nominal rate     4.63%      
Constellium N.V. senior unsecured notes issued December 2014, due 2023) [member]            
Disclosure of detailed information about borrowings [line items]            
Nominal Value | $       $ 400,000,000    
Effective rate     8.61% 8.61%    
Borrowings         387,000,000  
Nominal rate     8.00%      
Constellium N.V. senior unsecured notes issued December 2014, due 2023) [member]            
Disclosure of detailed information about borrowings [line items]            
Nominal Value     € 240,000,000      
Effective rate     7.54% 7.54%    
Borrowings         244,000,000  
Nominal rate     7.00%      
Constellium N.V. Senior Unsecured Notes (Issued February 2017, due 2025) [member]            
Disclosure of detailed information about borrowings [line items]            
Nominal Value     € 542,000,000 $ 650,000,000    
Effective rate     7.13% 7.13%    
Arrangement fees     € (13,000,000)      
Accrued interest     12,000,000      
Borrowings     € 541,000,000      
Nominal rate     6.63%      
Other loans [member]            
Disclosure of detailed information about borrowings [line items]            
Nominal Value     € 82,000,000      
Accrued interest     1,000,000      
Borrowings     € 83,000,000   80,000,000  
Ravenswood ABL facility (due 2018) [member]            
Disclosure of detailed information about borrowings [line items]            
Nominal rate     Floating      
Borrowings         € 46,000,000  
Muscle Shoals ABL facility (due 2020) [member]            
Disclosure of detailed information about borrowings [line items]            
Nominal rate     Floating      
Secured inventory based facility (due 2019) [member]            
Disclosure of detailed information about borrowings [line items]            
Nominal rate     Floating