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Financial liabilities at fair value through profit or loss - Trading liabilities by type (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of fair value measurement of liabilities [line items]    
Trading liabilities € 37,220 € 39,088
Equity securities    
Disclosure of fair value measurement of liabilities [line items]    
Trading liabilities 1,156 935
Debt securities    
Disclosure of fair value measurement of liabilities [line items]    
Trading liabilities 2,492 1,291
Funds on deposit    
Disclosure of fair value measurement of liabilities [line items]    
Trading liabilities 10,443 5,993
Derivatives    
Disclosure of fair value measurement of liabilities [line items]    
Trading liabilities € 23,129 € 30,869