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Loans and advances to customers - Additional information (Details) - EUR (€)
€ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure Of Financial Assets [Line Items]    
Loans and Advances to customers  € 647,313 € 644,893
Non-subordinated    
Disclosure Of Financial Assets [Line Items]    
Loans and Advances to customers  647,120 644,697
Finance leases    
Disclosure Of Financial Assets [Line Items]    
Allowance for finance lease receivables included in loan loss provisions 160 160
Interest income on loans 429 292
Stage 1    
Disclosure Of Financial Assets [Line Items]    
Allowance for finance lease receivables included in loan loss provisions 6 9
Stage 2    
Disclosure Of Financial Assets [Line Items]    
Allowance for finance lease receivables included in loan loss provisions 14 28
Stage 3    
Disclosure Of Financial Assets [Line Items]    
Allowance for finance lease receivables included in loan loss provisions € 139 € 123