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Loans and advances to customers - Summary of loans and advances to customers (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  € 647,313 € 644,893
Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  652,933 650,876
Loans and advances to customers | Accumulated impairments    
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  (5,621) (5,984)
Loans and advances to public authorities | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  14,384 12,677
Mortgages | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  329,506 322,850
Other personal lending | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  36,571 36,180
Corporate Lending | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  272,472 279,169
Netherlands    
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  180,099 183,772
Netherlands | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  180,928 184,766
Netherlands | Loans and advances to customers | Accumulated impairments    
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  (830) (993)
Netherlands | Loans and advances to public authorities | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  1,070 837
Netherlands | Mortgages | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  112,145 110,017
Netherlands | Other personal lending | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  5,036 5,835
Netherlands | Corporate Lending | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  62,677 68,077
Rest of the world    
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  467,214 461,120
Rest of the world | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  472,005 466,111
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  (4,791) (4,990)
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  13,314 11,840
Rest of the world | Mortgages | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  217,361 212,833
Rest of the world | Other personal lending | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  31,535 30,345
Rest of the world | Corporate Lending | Gross carrying amount    
Disclosure of detailed information about financial instruments [line items]    
Loans and Advances to customers  € 209,795 € 211,092