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Income taxes - Current income tax expense (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income taxes [Abstract]      
Current tax expense (income) € 322 € 318 € 275
Adjustments for current tax of prior periods 2 (4) (3)
Current tax expense (income) and adjustments for current tax of prior periods € 324 € 314 € 272