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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of investments in associates and joint ventures [line items] |  |  |
Balance sheet value | € 1,509 | € 1,500 |
Total assets | 980,299 | 976,834 | € 949,250
Total liabilities | 924,671 | 919,829 |
Total income | 18,121 | 30,418 | € 20,093
TMB Public Company Limited |  |  |
Disclosure of investments in associates and joint ventures [line items] |  |  |
Total assets | 121 | 121 |
Total liabilities | € 424 | € 309 |
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 | € 976 | € 849 |
Balance sheet value | 1,128 | 1,109 |
Total assets | 46,666 | 49,506 |
Total liabilities | 40,776 | 43,677 |
Total income | 1,386 | 1,303 |
Total expenses | 943 | 957 |
Other investments in associates and joint ventures |  |  |
Disclosure of investments in associates and joint ventures [line items] |  |  |
Balance sheet value | € 381 | € 391 |

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- Definition The amount of investments in subsidiaries, joint ventures and associates in an entity's separate financial statements. [Refer: Associates [member]; Joint ventures [member]; Subsidiaries [member]; Investments in subsidiaries reported in separate financial statements] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2023-01-01 -Paragraph 10 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2023-en-r&anchor=para_10&doctype=Standard -URIDate 2023-03-23 + Details
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