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Borrowings - Summary of Borrowings (Detail)
 6 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2019
EUR (€)
Jan. 01, 2019
EUR (€)
Dec. 31, 2018
EUR (€)
Dec. 31, 2017
EUR (€)
Disclosure of detailed information about borrowings [line items]          
Nominal Value   € 2,373,000,000      
Arrangement fees   (29,000,000)      
Accrued interest   34,000,000      
Borrowings   2,378,000,000 € 2,253,000,000 € 2,151,000,000 € 2,127,000,000
Non-current   2,216,000,000   2,094,000,000  
Current   162,000,000   57,000,000  
Constellium SE senior unsecured notes (Issued May 2014, due 2024) [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal Value $ 400,000,000 € 352,000,000      
Nominal rate 5.75%        
Effective rate 6.26% 6.26%      
Arrangement fees   € (3,000,000)      
Accrued interest   2,000,000      
Borrowings   351,000,000   348,000,000  
Constellium SE senior unsecured notes (Issued May 2014, due 2021) [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal Value   € 300,000,000      
Nominal rate 4.63%        
Effective rate 5.16% 5.16%      
Arrangement fees   € (2,000,000)      
Accrued interest   2,000,000      
Borrowings   300,000,000   300,000,000  
Constellium Se senior unsecured notes (Issued February 2017, due 2025) [Member]          
Disclosure of detailed information about borrowings [line items]          
Nominal Value $ 650,000,000 € 571,000,000      
Nominal rate 6.63%        
Effective rate 7.13% 7.13%      
Arrangement fees   € (11,000,000)      
Accrued interest   13,000,000      
Borrowings   573,000,000   568,000,000  
Constellium SE senior unsecured notes (Issued November 2017, due 2026) [Member]          
Disclosure of detailed information about borrowings [line items]          
Nominal Value $ 500,000,000 € 439,000,000      
Nominal rate 5.88%        
Effective rate 6.26% 6.26%      
Arrangement fees   € (7,000,000)      
Accrued interest   10,000,000      
Borrowings   442,000,000   440,000,000  
Constellium SE senior unsecured notes (Issued November 2017, due 2026) [Member]          
Disclosure of detailed information about borrowings [line items]          
Nominal Value   € 400,000,000      
Nominal rate 4.25%        
Effective rate 4.57% 4.57%      
Arrangement fees   € (6,000,000)      
Accrued interest   6,000,000      
Borrowings   400,000,000   399,000,000  
Lease liabilities [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal Value   187,000,000      
Borrowings   187,000,000   73,000,000  
Other loans [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal Value   31,000,000      
Accrued interest   1,000,000      
Borrowings   32,000,000   € 23,000,000  
Pan US ABL facility (due 2022) [member]          
Disclosure of detailed information about borrowings [line items]          
Nominal rate Floating        
Nominal Value $ 106,000,000 € 93,000,000      
Effective rate 4.43% 4.43%      
Borrowings   € 93,000,000      
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