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Operating Segment Information - Summary of Segment adjusted EBITDA and reconciliation of Adjusted EBITDA to Net Income (Parenthetical) (Detail) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]      
Start-up costs and development cost € (17) € (25) € (21)
Wise one-time cost   (20) (38)
Cash received from Wise purchase price adjustment   21  
Wise purchase price adjustment   20  
Gains / (Losses) on pension plan amendments 20   € (5)
Automotive Body Sheet Growth Projects [member]      
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]      
Start-up costs and development cost   € (20)  
AS&I [member]      
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]      
Start-up costs and development cost (16)    
Collective Bargaining agreement renegotiation [member]      
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]      
Legal fees and lump-sum payments € 3    
Collective bargaining agreement term 5 years