Intangible assets - Impairment testing (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash-generating units
Goodwill	$ 848	$ 896	$ 890
Percentage of reasonably possible decrease in cash flow projections	10.00%
Percentage of reasonably possible decrease in growth rate	1.00%
Percentage of reasonably possible increase in discount rate	1.00%
Impairment loss resulting from reasonably possible changes in assumptions, goodwill	$ 0
Thailand Asset Management
Cash-generating units
Goodwill	$ 450	$ 449
Period of discounted cash flow valuation	5 years
Constant growth rate	3.50%	3.50%
Pre-tax discount rate	9.00%	9.00%
UOB Life
Cash-generating units
Goodwill	$ 230	$ 238

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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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Total for all business combinations [member]]

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The pretax 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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Percentage of reasonably possible decrease in cash flow projections

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Percentage of reasonably possible decrease in growth rate

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Percentage of reasonably possible increase in discount rate

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Period over which management has projected cash flows based on financial budgets/forecasts approved by management, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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