The discount rate used in the current estimate of the present value of the future cash flows expected to be derived from an asset or cash-generating unit.

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The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Total for all cash-generating units [member]]

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The proportion of ownership interest in an associate attributable to the entity. [Refer: Total for all associates [member]]

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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)]

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Accumulated Impairment Losses

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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%