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Investment in associates and joint ventures - Additional information (Details) - EUR (€) € in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Dec. 31, 2023
Disclosure of investments in associates and joint ventures [Line items] |  |  |
Share of results | € 43 | € 38 |
TMBThanachart Bank Public Company Limited |  |  |
Disclosure of investments in associates and joint ventures [Line items] |  |  |
Accumulated Impairment Losses | 395 |  | € 395
TMBThanachart Bank Public Company Limited | TMBThanachart Bank Public Company Limited |  |  |
Disclosure of investments in associates and joint ventures [Line items] |  |  |
Share of results | 61 |  | 107
Associates and joint ventures |  |  |
Disclosure of investments in associates and joint ventures [Line items] |  |  |
Share of results | € 43 |  | € 149
TMBThanachart Bank Public Company Limited |  |  |
Disclosure of investments in associates and joint ventures [Line items] |  |  |
Discount rate (cost of equity) | 10.08% |  |
Growth rate used to extrapolate cash flow projections | 3.24% |  |
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 | € 119 |  |
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 | € (89) |  |
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 | € 87 |  |
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 | € (65) |  |
TMBThanachart Bank Public Company Limited | TMBThanachart Bank Public Company Limited |  |  |
Disclosure of investments in associates and joint ventures [Line items] |  |  |
Interest held (%) | 23.00% |  | 23.00%

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