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Deposits from banks - Schedule of deposits from banks by type (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of deposits from banks [Line Items]    
Non-interest bearing € 177 € 400
Interest bearing 23,080 56,232
Deposits from banks 23,257 56,632
Netherlands    
Disclosure of deposits from banks [Line Items]    
Non-interest bearing 3 86
Interest bearing 7,803 32,858
Deposits from banks 7,806 32,943
Rest of the world    
Disclosure of deposits from banks [Line Items]    
Non-interest bearing 174 315
Interest bearing 15,277 23,374
Deposits from banks € 15,451 € 23,689