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Deferred Income Taxes - Summary of Deferred Income Taxes (Detail) - EUR (€)
€ in Millions
Dec. 31, 2018
Dec. 31, 2017
Major components of tax expense (income) [abstract]    
Deferred income tax assets € 163 € 164
Deferred income tax liabilities (22) (25)
Net deferred income tax assets € 141 € 139