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Finance Costs-Net - Summary of Finance Costs-Net (Parenthetical) (Detail) - EUR (€)
€ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Analysis of income and expense [line items]        
Other finance expense € (2) € (2) € (8) € (11)
Capitalisation rate     6.00% 6.00%
Constellium N.V. Senior Notes [member]        
Analysis of income and expense [line items]        
Interest expense on debt instrument     € 58 € 56
Pan US ABL Facility [member]        
Analysis of income and expense [line items]        
Interest expense on debt instrument     € 4 2
Constellium UACJ loan modification [member]        
Analysis of income and expense [line items]        
Other finance expense       € (6)