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Risk management - Summary forborne portfolio (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of credit risk exposure [line items]    
Forborne assets € 12,817 € 13,089
% of total portfolio 1.50% 1.50%
Wholesale Banking    
Disclosure of credit risk exposure [line items]    
Forborne assets € 5,934 € 6,063
% of total portfolio 1.90% 1.80%
Retail Banking    
Disclosure of credit risk exposure [line items]    
Forborne assets € 6,883 € 7,026
% of total portfolio 1.30% 1.40%
Of which: performing    
Disclosure of credit risk exposure [line items]    
Forborne assets € 7,178 € 8,047
Of which: performing | Wholesale Banking    
Disclosure of credit risk exposure [line items]    
Forborne assets 3,191 3,919
Of which: performing | Retail Banking    
Disclosure of credit risk exposure [line items]    
Forborne assets 3,987 4,128
Of which: non-performing    
Disclosure of credit risk exposure [line items]    
Forborne assets 5,640 5,042
Of which: non-performing | Wholesale Banking    
Disclosure of credit risk exposure [line items]    
Forborne assets 2,743 2,144
Of which: non-performing | Retail Banking    
Disclosure of credit risk exposure [line items]    
Forborne assets € 2,897 € 2,898