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Financial liabilities at fair value through profit or loss - financial liabilities at fair value through profit or loss (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value measurement of liabilities [abstract]    
Trading liabilities € 37,220 € 39,088
Non-trading derivatives 2,019 3,048
Designated at fair value through profit or loss 55,400 50,883
Financial liabilities € 94,638 € 93,019