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Transfer of financial assets, assets pledged and received as collateral - Additional information (Details) - EUR (€)
€ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of offsetting of financial liabilities [line items]    
Financial assets pledged € 106,052 € 126,682
Mandatory reserve deposits    
Disclosure of offsetting of financial liabilities [line items]    
Financial assets pledged € 11,653 € 11,108