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Financial assets at fair value through profit or loss - Designated as 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]    
Designated at fair value through profit or loss € 5,775 € 6,159
Loans and receivables    
Disclosure of fair value measurement of assets [line items]    
Designated at fair value through profit or loss 1,306 722
Debt securities    
Disclosure of fair value measurement of assets [line items]    
Designated at fair value through profit or loss € 4,470 € 5,437