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Transfer of financial assets, assets pledged and received as collateral - Schedule of financial assets received as collateral (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
–  equity securities    
Financial assets received as collateral [Line Items]    
Total received collateral available for sale or repledge at fair value € 33,234 € 22,847
of which sold or repledged at fair value 20,526 18,613
–  debt securities    
Financial assets received as collateral [Line Items]    
Total received collateral available for sale or repledge at fair value 119,908 103,723
of which sold or repledged at fair value € 86,448 € 66,636