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Financial Instruments - Summary of Other Financial Assets and Other Financial Liabilities Positions (Detail) - EUR (€)
€ in Millions
Jun. 30, 2018
Dec. 31, 2017
Disclosure of detailed information about financial instruments [line items]    
Non-current derivative financial assets € 11 € 29
Current derivative financial assets 33 67
Derivatives assets 44 96
Non-current loans 74 81
Current loans 2 2
Loans 76 83
Other non-current financial assets 85 110
Other current financial assets 35 69
Other financial assets 120 179
Other non-current financial liabilities 29 43
Other current financial liabilities 28 23
Other financial liabilities 57 66
Non-current derivative financial liabilities 29 43
Current derivative financial liabilities 28 23
Derivatives Liabilities 57 66
Aluminium and premium future contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivative financial assets 3 6
Current derivative financial assets 13 39
Derivatives assets 16 45
Non-current derivative financial liabilities 3  
Current derivative financial liabilities 12 6
Derivatives Liabilities 15 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 3  
Current derivative financial liabilities 2 1
Derivatives Liabilities 5 1
Currency commercial contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivative financial assets 7 21
Current derivative financial assets 18 20
Derivatives assets 25 41
Non-current derivative financial liabilities 4 6
Current derivative financial liabilities 10 12
Derivatives Liabilities 14 18
Currency net debt derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivative financial assets 1 2
Current derivative financial assets 2 7
Derivatives assets 3 9
Non-current derivative financial liabilities 19 37
Current derivative financial liabilities 4 4
Derivatives Liabilities € 23 € 41