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Deposits from banks - Additional information (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of deposits from banks [Line Items]    
Deposits from banks € 23,257 € 56,632
Repayment of deposits from banks 30,000  
TLTRO    
Disclosure of deposits from banks [Line Items]    
Deposits from banks € 6,000 € 36,000