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Financial Instruments - Summary of Other Financial Assets and Other Financial Liabilities Positions (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]    
Non-current derivative financial assets € 7 € 29
Current derivative financial assets 23 67
Derivatives assets 30 96
Non-current loans 67 81
Current loans 2 2
Loans 69 83
Other non-current financial assets 74 110
Other current financial assets 30 69
Other financial assets 104 179
Other non-current financial liabilities 29 43
Other current financial liabilities 60 23
Other financial liabilities 89 66
Non-current derivative financial liabilities 29 43
Current derivative financial liabilities 60 23
Derivatives Liabilities 89 66
Aluminium and premium future contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivative financial assets 2 6
Current derivative financial assets 7 39
Derivatives assets 9 45
Non-current derivative financial liabilities 6  
Current derivative financial liabilities 38 6
Derivatives Liabilities 44 6
Other future contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Current derivative financial assets   1
Derivatives assets   1
Non-current derivative financial liabilities 5  
Current derivative financial liabilities 3 1
Derivatives Liabilities 8 1
Currency commercial contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivative financial assets 3 21
Current derivative financial assets 12 20
Derivatives assets 15 41
Non-current derivative financial liabilities 7 6
Current derivative financial liabilities 12 12
Derivatives Liabilities 19 18
Currency net debt derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivative financial assets 2 2
Current derivative financial assets 4 7
Derivatives assets 6 9
Non-current derivative financial liabilities 11 37
Current derivative financial liabilities 3 4
Derivatives Liabilities 14 € 41
Margin call [member]    
Disclosure of detailed information about financial instruments [line items]    
Current derivative financial assets 5  
Derivatives assets 5  
Net investment hedge [member]    
Disclosure of detailed information about financial instruments [line items]    
Current derivative financial liabilities 4  
Derivatives Liabilities € 4