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Income taxes - Current income tax expense (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income taxes [Abstract]      
Current tax expense (income) € 291 € 390 € 248
Adjustments for current tax of prior periods 7 (10) 3
Current tax expense (income) and adjustments for current tax of prior periods € 298 € 380 € 251