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Risk management - Summary forborne portfolio (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of credit risk exposure [line items]    
Forborne assets € 13,089 € 16,438
% of total portfolio 1.50% 2.00%
Wholesale Banking    
Disclosure of credit risk exposure [line items]    
Forborne assets € 6,063 € 8,359
% of total portfolio 1.80% 2.70%
Retail Banking    
Disclosure of credit risk exposure [line items]    
Forborne assets € 7,026 € 8,080
% of total portfolio 1.40% 1.60%
Of which: performing    
Disclosure of credit risk exposure [line items]    
Forborne assets € 8,047 € 10,853
Of which: performing | Wholesale Banking    
Disclosure of credit risk exposure [line items]    
Forborne assets 3,919 5,880
Of which: performing | Retail Banking    
Disclosure of credit risk exposure [line items]    
Forborne assets 4,128 4,973
Of which: non-performing    
Disclosure of credit risk exposure [line items]    
Forborne assets 5,042 5,585
Of which: non-performing | Wholesale Banking    
Disclosure of credit risk exposure [line items]    
Forborne assets 2,144 2,478
Of which: non-performing | Retail Banking    
Disclosure of credit risk exposure [line items]    
Forborne assets € 2,898 € 3,107