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Loans and advances to banks - Schedule of loans and advances to banks (Details) - EUR (€)
€ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of loans and advances to banks [line items]    
Loans and advances to banks € 21,770 € 16,709
Gross carrying amount    
Disclosure of loans and advances to banks [line items]    
Loans and advances to banks 21,792 16,739
Accumulated impairments    
Disclosure of loans and advances to banks [line items]    
Loans and advances to banks (22) (30)
Netherlands    
Disclosure of loans and advances to banks [line items]    
Loans and advances to banks 14,344 9,441
Netherlands | Gross carrying amount    
Disclosure of loans and advances to banks [line items]    
Loans and advances to banks 14,353 9,453
Netherlands | Accumulated impairments    
Disclosure of loans and advances to banks [line items]    
Loans and advances to banks (8) (11)
Rest of the world    
Disclosure of loans and advances to banks [line items]    
Loans and advances to banks 7,426 7,268
Rest of the world | Gross carrying amount    
Disclosure of loans and advances to banks [line items]    
Loans and advances to banks 7,439 7,286
Rest of the world | Accumulated impairments    
Disclosure of loans and advances to banks [line items]    
Loans and advances to banks € (13) € (18)