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Investment in associates and joint ventures - Additional information (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] |  |  |
Share of results | € 205 | € 149 | € 92
TMBThanachart Bank Public Company Limited |  |  |
Disclosure of investments in associates and joint ventures [line items] |  |  |
Percentage of ownership interest | 23.00% | 23.00% |
Share of results | € 123 | € 107 |
Accumulated impairment losses | 395 | 395 |
Belgium Associate |  |  |
Disclosure of investments in associates and joint ventures [line items] |  |  |
Share of results | 77 |  |
Associates and joint ventures |  |  |
Disclosure of investments in associates and joint ventures [line items] |  |  |
Share of results | 205 | 149 |
Impairments | € 35 | € 5 |
TMBThanachart Bank Public Company Limited |  |  |
Disclosure of investments in associates and joint ventures [line items] |  |  |
Discount rate (cost of equity) | 10.96% |  |
Terminal growth rate | 2.74% |  |
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 | € 57 |  |
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 | € (59) |  |
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 | € 95 |  |
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 | € (75) |  |
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 | € 68 |  |
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 | € (53) |  |
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 entity's share of the profit (loss) of associates and joint ventures accounted for using the equity method. [Refer: Total for all associates [member]; Investments accounted for using equity method; Total for all joint ventures [member]; Profit (loss)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 28 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_28_e&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2024-01-01 -Paragraph 23 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2024-en-r&anchor=para_23_g&doctype=Standard -URIDate 2024-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 82 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_82_c&doctype=Standard -URIDate 2024-03-27 + Details
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