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Customer deposits - Schedule of customer deposits (Details) - EUR (€)
€ in Millions
Jun. 30, 2024
Dec. 31, 2023
Deposits from customers [abstract]    
Current accounts / Overnight deposits € 225,865 € 221,773
Savings accounts 349,910 334,296
Time deposits 113,104 92,154
Other 3,699 2,053
Customer deposits € 692,577 € 650,276