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Income taxes - Components (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Components of the income tax benefit/(expense)      
Current tax expense € (439) € (429) € (421)
Deferred tax benefit/(expense) 59 (391) 2,454
Total € (380) € (820) € 2,033