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Financial Instruments - Summary of Other Financial Assets and Other Financial Liabilities Positions (Detail) - EUR (€)
€ in Millions
Jun. 30, 2019
Dec. 31, 2018
Disclosure of detailed information about financial instruments [line items]    
Non-current derivative financial assets € 7 € 7
Current derivative financial assets 19 23
Derivatives assets 26 30
Non-current loans   67
Current loans   2
Loans   69
Other non-current financial assets 7 74
Other current financial assets 19 30
Other financial assets 26 104
Other non-current financial liabilities 25 29
Other current financial liabilities 44 60
Other financial liabilities 69 89
Non-current derivative financial liabilities 25 29
Current derivative financial liabilities 44 60
Derivatives Liabilities 69 89
Aluminium and premium future contract [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 5 6
Current derivative financial liabilities 22 38
Derivatives Liabilities 27 44
Other future contract [member]    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivative financial liabilities 3 5
Current derivative financial liabilities 3 3
Derivatives Liabilities 6 8
Currency commercial contracts [member]    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivative financial assets 5 3
Current derivative financial assets 12 12
Derivatives assets 17 15
Non-current derivative financial liabilities 10 7
Current derivative financial liabilities 14 12
Derivatives Liabilities 24 19
Currency net debt derivatives [member]    
Disclosure of detailed information about financial instruments [line items]    
Non-current derivative financial assets   2
Current derivative financial assets 3 4
Derivatives assets 3 6
Non-current derivative financial liabilities 7 11
Current derivative financial liabilities 5 3
Derivatives Liabilities € 12 14
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