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Investment in associates and joint ventures - Additional information (Details) - EUR (€) € in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2025 | Dec. 31, 2024
TMBThanachart Bank Public Company Limited |  |
Disclosure of investments in associates and joint ventures [line items] |  |
Share of results | € 65 | € 123
Accumulated impairment losses | 395 | 395
Associates and joint ventures |  |
Disclosure of investments in associates and joint ventures [line items] |  |
Share of results | € 85 | € 205
TMBThanachart Bank Public Company Limited |  |
Disclosure of investments in associates and joint ventures [line items] |  |
Discount rate (cost of equity) | 10.75% |
Growth rate used to extrapolate cash flow projections | 2.19% |
TMBThanachart Bank Public Company Limited | Increase in Cash Flows |  |
Disclosure of investments in associates and joint ventures [line items] |  |
Sensitivity analysis, reasonably possible change in risk variable (in percent) | 0.10 |
Increase (decrease) in value in use | € 65 |
TMBThanachart Bank Public Company Limited | Decrease in Cash Flows |  |
Disclosure of investments in associates and joint ventures [line items] |  |
Sensitivity analysis, reasonably possible change in risk variable (in percent) | (0.10) |
Increase (decrease) in value in use | € (66) |
TMBThanachart Bank Public Company Limited | Increase in Discount Rate |  |
Disclosure of investments in associates and joint ventures [line items] |  |
Sensitivity analysis, reasonably possible change in risk variable (in percent) | (0.01) |
Increase (decrease) in value in use | € 110 |
TMBThanachart Bank Public Company Limited | Decrease in Discount Rate |  |
Disclosure of investments in associates and joint ventures [line items] |  |
Sensitivity analysis, reasonably possible change in risk variable (in percent) | 0.01 |
Increase (decrease) in value in use | € (87) |
TMBThanachart Bank Public Company Limited | Increase in Terminal Growth Rate |  |
Disclosure of investments in associates and joint ventures [line items] |  |
Sensitivity analysis, reasonably possible change in risk variable (in percent) | 0.01 |
Increase (decrease) in value in use | € 75 |
TMBThanachart Bank Public Company Limited | Decrease in Terminal Growth Rate |  |
Disclosure of investments in associates and joint ventures [line items] |  |
Sensitivity analysis, reasonably possible change in risk variable (in percent) | (0.01) |
Increase (decrease) in value in use | € (59) |
TMBThanachart Bank Public Company Limited | TMB Public Company Limited |  |
Disclosure of investments in associates and joint ventures [line items] |  |
Percentage of ownership interest | 23.00% | 23.00%

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- Definition The proportion of ownership interest in an associate attributable to the entity. [Refer: Total for all associates [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2024-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2024-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=27&code=ifrs-tx-2024-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2024-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2024-en-r&anchor=para_21_a_iv&doctype=Standard -URIDate 2024-03-27 + Details
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