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Deferred Income Taxes - Summary of Deferred Income Taxes (Detail) - EUR (€)
€ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Major components of tax expense (income) [abstract]      
Deferred income tax assets € 164 € 252  
Deferred income tax liabilities (25) (30)  
Net Deferred income tax assets € 139 € 222 € 260