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Financial assets at fair value through profit or loss - Mandatorily at fair value through profit or loss (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value measurement of assets [line items]    
Mandatorily measured at fair value through profit or loss € 54,983 € 46,844
Loans and receivables    
Disclosure of fair value measurement of assets [line items]    
Mandatorily measured at fair value through profit or loss 53,911 45,820
Equity securities    
Disclosure of fair value measurement of assets [line items]    
Mandatorily measured at fair value through profit or loss 179 203
Debt securities    
Disclosure of fair value measurement of assets [line items]    
Mandatorily measured at fair value through profit or loss € 894 € 821