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Income taxes - Current income tax expense (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income taxes [Abstract]      
Current tax expense (income) € (318) € (275) € (165)
Adjustments for current tax of prior periods 4 3 20
Total current tax expense (income) and adjustments for current tax of prior periods € (314) € (272) € (145)