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Debt securities - Additional information (Details) - Debt securities - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about financial instruments [line items]    
Financial assets € 98,864 € 87,703
Debt securities portfolio    
Disclosure of detailed information about financial instruments [line items]    
Financial assets € 91,957 € 83,513