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Treasury Risk Management - Summary of Derivatives Used to Hedge (Parenthetical) (Detail) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about hedges [Line Items]    
Financial assets € 4,762 € 4,654
Foreign exchange derivatives including cross currency swaps [member] | Hedges of Net Investment in Foreign Operations [member]    
Disclosure of detailed information about hedges [Line Items]    
Financial assets € (103) € 174