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Risk management - Summary forborne portfolio by forberance type (Details) - EUR (€) € in Millions | 12 Months Ended
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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%
Forborne |  |
Disclosure of credit risk exposure [line items] |  |
Increase (decrease) of forborne assets | € (272) |
Forborne | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Increase (decrease) of forborne assets | (129) |
Forborne assets | € 5,900 | € 6,100
% of total portfolio | 1.90% | 1.80%
Forborne | Retail Banking |  |
Disclosure of credit risk exposure [line items] |  |
Increase (decrease) of forborne assets | € (143) |
Loan modification |  |
Disclosure of credit risk exposure [line items] |  |
Forborne assets | € 11,726 | € 11,881
% of total portfolio | 1.40% | 1.40%
Refinancing |  |
Disclosure of credit risk exposure [line items] |  |
Forborne assets | € 1,091 | € 1,208
% of total portfolio | 0.10% | 0.10%
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: performing | Forborne | Wholesale Banking |  |
Disclosure of credit risk exposure [line items] |  |
Increase (decrease) of forborne assets | (728) |
Of which: performing | Loan modification |  |
Disclosure of credit risk exposure [line items] |  |
Forborne assets | 6,734 | 7,550
Of which: performing | Refinancing |  |
Disclosure of credit risk exposure [line items] |  |
Forborne assets | 444 | 497
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
Of which: non-performing | Forborne |  |
Disclosure of credit risk exposure [line items] |  |
Increase (decrease) of forborne assets | 599 |
Of which: non-performing | Loan modification |  |
Disclosure of credit risk exposure [line items] |  |
Forborne assets | 4,993 | 4,331
Of which: non-performing | Refinancing |  |
Disclosure of credit risk exposure [line items] |  |
Forborne assets | € 647 | € 711

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