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Financial assets at fair value through profit or loss - Summary of exposure to (reverse) repurchase agreements (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss € 123,015 € 113,766
Financial liabilities at fair value through profit or loss 94,638 93,019
Reverse repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 69,407 73,587
Repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities at fair value through profit or loss 58,227 52,655
Deposits from banks | Repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities at fair value through profit or loss 2,064 3,809
Customer deposits | Repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities at fair value through profit or loss 97 1
Trading liabilities, funds on deposit | Repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities at fair value through profit or loss 10,337 5,715
Funds entrusted designated and measured at fair value through profit or loss | Repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial liabilities at fair value through profit or loss 45,729 43,131
Loans and advances to banks | Reverse repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 5,251 19,395
Loans and advances to customers | Reverse repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 499 1,306
Trading assets, loans and receivables | Reverse repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss 12,121 9,732
Loans and receivables | Reverse repurchase transactions    
Disclosure of fair value measurement of assets [line items]    
Financial assets at fair value through profit or loss € 51,536 € 43,153