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Financial Instruments - Summary of Other Financial Assets and Other Financial Liabilities Positions (Detail) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about financial instruments [line items]    
Non-current derivative financial assets € 29 € 49
Current derivative financial assets 67 51
Derivatives assets 96 100
Non-current loans 81  
Current loans 2 66
Loans 83 66
Other non-current financial assets 110 49
Other current financial assets 69 117
Other financial assets 179 166
Other non-current financial liabilities 43 30
Other current financial liabilities 23 34
Other financial liabilities 66 64
Non-current derivative financial liabilities 43 30
Current derivative financial liabilities 23 34
Derivatives Liabilities 66 64
Aluminium and premium future contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivative financial assets 6  
Current derivative financial assets 39 6
Derivatives assets 45 6
Non-current derivative financial liabilities   4
Current derivative financial liabilities 6 5
Derivatives Liabilities 6 9
Energy future contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Current derivative financial assets   4
Derivatives assets   4
Other future contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Current derivative financial assets 1  
Derivatives assets 1  
Current derivative financial liabilities 1 2
Derivatives Liabilities 1 2
Currency commercial contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivative financial assets 21 2
Current derivative financial assets 20 11
Derivatives assets 41 13
Non-current derivative financial liabilities 6 26
Current derivative financial liabilities 12 27
Derivatives Liabilities 18 53
Currency net debt derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivative financial assets 2 47
Current derivative financial assets 7 30
Derivatives assets 9 € 77
Non-current derivative financial liabilities 37  
Current derivative financial liabilities 4  
Derivatives Liabilities € 41