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Trade Receivables and Other - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2017
EUR (€)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Disclosure of trade and other receivables [line items]        
Reversal of impairment allowance     € (700,000) € 800,000
Factored assets € 642,000,000   642,000,000 681,000,000
Factored assets, derecognized from Consolidated Statement of Financial Position 473,000,000   473,000,000 566,000,000
Factored assets, recognized in Consolidated Statement of Financial Position 169,000,000   169,000,000 115,000,000
Debt due factor € 0   € 0 € 1,000,000
Factoring of receivables [member] | Muscle Shoals factoring facility [member]        
Disclosure of trade and other receivables [line items]        
Factoring maximum capacity | $   $ 325,000,000    
Accounts receivable factoring agreement maturity date Jan. 24, 2018 Jan. 24, 2018    
Factoring of receivables [member] | Muscle Shoals factoring facility [member] | 2018 amendment [member]        
Disclosure of trade and other receivables [line items]        
Accounts receivable factoring agreement amendment date Jan. 02, 2018 Jan. 02, 2018    
Factoring of receivables [member] | Muscle Shoals factoring facility [member] | 2017 amendment [member]        
Disclosure of trade and other receivables [line items]        
Accounts receivable factoring agreement amendment date Jan. 31, 2017 Jan. 31, 2017    
France [member] | Factoring of receivables [member]        
Disclosure of trade and other receivables [line items]        
Factoring maximum capacity € 235,000,000      
Accounts receivable factoring agreement maturity date Oct. 29, 2021 Oct. 29, 2021    
Accounts receivable factoring agreement amendment date Apr. 19, 2017 Apr. 19, 2017    
Germany Switzerland and Czech Republic [Member] | Factoring of receivables [member]        
Disclosure of trade and other receivables [line items]        
Factoring maximum capacity € 150,000,000      
Accounts receivable factoring agreement maturity date Oct. 29, 2021 Oct. 29, 2021    
United States [member] | Factoring of receivables [member] | Constellium automotive [member]        
Disclosure of trade and other receivables [line items]        
Factoring maximum capacity | $   $ 25,000,000    
Accounts receivable factoring agreement maturity date Dec. 12, 2018 Dec. 12, 2018    
Accounts receivable factoring agreement amendment date Dec. 13, 2017 Dec. 13, 2017