The mortality rate used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [domain]]

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The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

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The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Classes of contingent liabilities [domain]; Financial assets]

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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

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Mortality per annum long term trend.

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Retirement benefits - Additional Information (Detail) £ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 31, 2025 GBP (£)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)
Actuarial assumption of expected rates of mortality \| United Kingdom
Disclosure of defined benefit plans [line items]
Mortality - per annum long term trend	1.25%
Pensioners male \| United Kingdom
Disclosure of defined benefit plans [line items]
Actuarial assumption of mortality rates	0.91	0.91
Pensioners female \| United Kingdom
Disclosure of defined benefit plans [line items]
Actuarial assumption of mortality rates	0.85	0.85
Non-pensioners male \| United Kingdom
Disclosure of defined benefit plans [line items]
Actuarial assumption of mortality rates	0.86	0.86
Non-pensioners female \| United Kingdom
Disclosure of defined benefit plans [line items]
Actuarial assumption of mortality rates	0.84	0.84
United Kingdom
Disclosure of defined benefit plans [line items]
Approximate extinguishment of the unfunded pension obligations	70.00%
Bank accounts pledged as security	$ 27	£ 20
Philippines
Disclosure of defined benefit plans [line items]
Net retirement benefit asset	3		$ 3
Plan assets	15		13
Defined benefit obligation	12		10
Unfunded Plans \| Net defined benefit liability (asset) \| Other post-employment benefit plans
Disclosure of defined benefit plans [line items]
Post-employment benefit plans	$ 9		$ 7	$ 0