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Financial liabilities at fair value through profit or loss - Summary of designated as at fair value through profit or loss by type (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value measurement of liabilities [line items]    
Designated at fair value through profit or loss € 55,400 € 50,883
Funds entrusted    
Disclosure of fair value measurement of liabilities [line items]    
Designated at fair value through profit or loss 46,633 44,263
Subordinated liabilities    
Disclosure of fair value measurement of liabilities [line items]    
Designated at fair value through profit or loss 95 82
Debt securities    
Disclosure of fair value measurement of liabilities [line items]    
Designated at fair value through profit or loss € 8,672 € 6,537