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Risk management - Quantitative SICR thresholds (Details)
€ in Millions
 12 Months Ended
Dec. 31, 2024
EUR (€)
Dec. 31, 2023
EUR (€)
Disclosure of financial assets [line items]    
Total ECL collective assessment € 1,328 € 1,412
Upside scenario    
Disclosure of financial assets [line items]    
Total ECL collective assessment for performing assets € 1,066  
Change in average threshold ratio 0.50%  
Downside scenario    
Disclosure of financial assets [line items]    
Total ECL collective assessment for performing assets € 1,911  
Change in average threshold ratio (1.90%)  
Mortgages | Investment grade    
Disclosure of financial assets [line items]    
Average threshold ratio 2.9 2.5
Mortgages | Non-Investment grade    
Disclosure of financial assets [line items]    
Average threshold ratio 2.4 2.3
Consumer lending | Investment grade    
Disclosure of financial assets [line items]    
Average threshold ratio 2.8 2.9
Consumer lending | Non-Investment grade    
Disclosure of financial assets [line items]    
Average threshold ratio 2.1 2.1
Business lending | Investment grade    
Disclosure of financial assets [line items]    
Average threshold ratio 2.7 2.7
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 2.9 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 2.7 2.8
Other Wholesale Banking | Non-Investment grade    
Disclosure of financial assets [line items]    
Average threshold ratio 1.9 1.8