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Customer deposits - Schedule of customer deposits by type (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of customer deposits [line items]    
Non-interest bearing € 25,556 € 26,561
Interest bearing 624,720 614,238
Customer deposits 650,276 640,799
Netherlands    
Disclosure of customer deposits [line items]    
Non-interest bearing 239 2,332
Interest bearing 232,548 231,914
Customer deposits 232,788 234,246
Rest of the world    
Disclosure of customer deposits [line items]    
Non-interest bearing 25,316 24,229
Interest bearing 392,172 382,324
Customer deposits € 417,488 € 406,552