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Other operating expenses - Additional information (Details) - EUR (€)
€ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Disclosure of other operating expense [line items]    
Decrease in local bank taxes € 62  
Local bank taxes 255 € 192
Netherlands, Germany and Belgium    
Disclosure of other operating expense [line items]    
Contributions to the Deposit Guarantee Schemes 157 174
Poland    
Disclosure of other operating expense [line items]    
Contributions to the Local Resolution Fund € 35 € 250