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Risk management - Quantitative SICR thresholds (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2023
EUR (€)
Dec. 31, 2022
Disclosure Of Financial Assets [Line Items]    
Total ECL collective-assessment € 1,412  
Upside scenario    
Disclosure Of Financial Assets [Line Items]    
Total ECL collective-assessment for performing assets € 1,054  
Change in average threshold ratio (0.50%)  
Downside scenario    
Disclosure Of Financial Assets [Line Items]    
Total ECL collective-assessment for performing assets € 2,290  
Change in average threshold ratio 3.80%  
Mortgages | Investment grade    
Disclosure Of Financial Assets [Line Items]    
Average threshold ratio 2.5 2.7
Mortgages | Non-Investment grade    
Disclosure Of Financial Assets [Line Items]    
Average threshold ratio 2.3 2.3
Consumer lending | Investment grade    
Disclosure Of Financial Assets [Line Items]    
Average threshold ratio 2.9 2.8
Consumer lending | Non-Investment grade    
Disclosure Of Financial Assets [Line Items]    
Average threshold ratio 2.1 1.8
Business lending | Investment grade    
Disclosure Of Financial Assets [Line Items]    
Average threshold ratio 2.7 2.8
Business lending | Non-Investment grade    
Disclosure Of Financial Assets [Line Items]    
Average threshold ratio 2.1 2.1
Governments and Financial Institutions | Investment grade    
Disclosure Of Financial Assets [Line Items]    
Average threshold ratio 3.0 3.0
Governments and Financial Institutions | Non-Investment grade    
Disclosure Of Financial Assets [Line Items]    
Average threshold ratio 1.9 1.9
Other Wholesale Banking | Investment grade    
Disclosure Of Financial Assets [Line Items]    
Average threshold ratio 2.8 2.8
Other Wholesale Banking | Non-Investment grade    
Disclosure Of Financial Assets [Line Items]    
Average threshold ratio 1.8 1.9