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Income taxes - Current income tax expense (Detail) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Income taxes [Abstract]      
Current tax expense (income) € 211 € 111 € 291
Adjustments for current tax of prior periods (10) (14) 7
Current tax expense (income) and adjustments for current tax of prior periods € 201 € 97 € 298