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Investment in associates and joint ventures - Summary of investments in associates and joint ventures (Details) - EUR (€) € in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of investments in associates and joint ventures [line items] |  |  |
Balance sheet value | € 1,679 | € 1,509 |
Total assets | 1,023,856 | 980,299 | € 976,834
Total liabilities | 970,158 | 924,671 |
Total income | 21,087 | 18,121 | € 30,418
TMB Public Company Limited |  |  |
Disclosure of investments in associates and joint ventures [line items] |  |  |
Total assets | 142 | 121 |
Total liabilities | € 263 | € 424 |
TMB Public Company Limited | TMBThanachart Bank Public Company Limited |  |  |
Disclosure of investments in associates and joint ventures [line items] |  |  |
Interest held | 23.00% | 23.00% |
Fair value of listed invest-ments | € 1,164 | € 976 |
Balance sheet value | 1,266 | 1,128 |
Total assets | 49,147 | 46,666 |
Total liabilities | 42,554 | 40,776 |
Total income | 1,474 | 1,386 |
Total expenses | 1,050 | 943 |
Other investments in associates and joint ventures |  |  |
Disclosure of investments in associates and joint ventures [line items] |  |  |
Balance sheet value | € 412 | € 381 |

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