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Risk management - Summary forborne portfolio (Details) - EUR (€) € in Millions | 12 Months Ended
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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

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