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Income Tax - Summary of Current and Deferred Components of Income Tax (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Major components of tax expense (income) [abstract]      
Current tax expense € (26) € (19) € (21)
Deferred tax (expense) / benefit (54) (50) 53
Income tax (expense) / benefit € (80) € (69) € 32