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Inventories - Additional Information (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of inventories [line items]    
Inventories carried at net realisable value € 92 € 110
Damaged, obsolete and lost inventories 109 113
Inventory provisions utilised or released to income statement 90 € 113
Spreads business [member]    
Disclosure of inventories [line items]    
Inventory € 129