v3.25.4
Loans and advances to customers - Summary of loans and advances to customers (Details) - EUR (€)
€ in Millions
Dec. 31, 2025
Dec. 31, 2024
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers € 727,733 € 683,611
Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 733,627 689,445
Loans and advances to customers | Accumulated impairments    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers (5,894) (5,833)
Loans and advances to public authorities | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 23,034 18,661
Residential mortgages | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 375,097 348,594
Other personal lending | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 39,723 36,797
Corporate Lending | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 295,773 285,393
Netherlands    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 206,434 192,197
Netherlands | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 207,270 193,007
Netherlands | Loans and advances to customers | Accumulated impairments    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers (836) (811)
Netherlands | Loans and advances to public authorities | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 3,452 1,888
Netherlands | Residential mortgages | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 129,994 119,191
Netherlands | Other personal lending | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 5,033 5,007
Netherlands | Corporate Lending | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 68,792 66,921
Rest of the world    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 521,299 491,415
Rest of the world | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 526,357 496,437
Rest of the world | Loans and advances to customers | Accumulated impairments    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers (5,058) (5,023)
Rest of the world | Loans and advances to public authorities | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 19,583 16,773
Rest of the world | Residential mortgages | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 245,103 229,403
Rest of the world | Other personal lending | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers 34,690 31,789
Rest of the world | Corporate Lending | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and advances to customers € 226,981 € 218,473