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Income taxes - Deferred income tax expense (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income taxes [Abstract]      
Recognition of previously unrecognized tax loss and credit carryforwards € 32 € 19 € 4
Unrecognized tax loss and credit carryforwards (9) (56) (9)
Unrecognized (Recognition of) temporary differences 35 31 (35)
Prior year tax 6 (1) (6)
Tax rate changes (72) 5 (19)
Origination and reversal of temporary differences, tax losses and tax credits (69) (56) 6
Deferred tax (expense) benefit € (77) € (58) € (59)