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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
 1 Months Ended 12 Months Ended
Jul. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]        
Start-up costs and development cost   € (21) € (17) € (25)
Wise one-time cost       (20)
Cash received from Wise purchase price adjustment       21
Wise purchase price adjustment       20
Gains / (Losses) on pension plans amendments   36 20  
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  
AS&I [member]        
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]        
Start-up costs and development cost   € 21 € 16  
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
Disposal of leased assets [member] | Novelis [member]        
Disclosure of segment adjusted EBITDA and reconciliation of adjusted EBITDA to net income [line items]        
Sale of assets € 200      
Net gain on sale of assets € 190