Retirement Benefit and Other Post-retirement Obligations - Summary of Principal Assumptions Used for UK Group Plan and US PRMB (Detail)	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
UK Group plan [member]
Disclosure of defined benefit plans [line items]
Inflation	2.80%	3.10%	3.00%
Rate used to discount plan liabilities	5.50%	5.50%	4.60%
Expected rate of increase in salaries	3.30%	3.60%	3.50%
Other plans [member]
Disclosure of defined benefit plans [line items]
Inflation	2.00%	2.00%	2.00%
Rate used to discount plan liabilities	4.90%	5.10%	4.90%
Expected rate of increase in salaries	2.50%	2.50%	2.50%
Expected rate of increase for pensions in payment and deferred pensions	0.00%	0.00%	0.00%
PRMB [member]
Disclosure of defined benefit plans [line items]
Inflation	0.00%	0.00%	0.00%
Rate used to discount plan liabilities	4.90%	5.40%	5.00%
Expected rate of increase in salaries	0.00%	0.00%	0.00%
Expected rate of increase for pensions in payment and deferred pensions	0.00%	0.00%	0.00%
Bottom of range [member] \| UK Group plan [member]
Disclosure of defined benefit plans [line items]
Expected rate of increase for pensions in payment and deferred pensions	1.70%	1.85%	1.75%
Top of range [member] \| UK Group plan [member]
Disclosure of defined benefit plans [line items]
Expected rate of increase for pensions in payment and deferred pensions	5.10%	5.15%	5.10%
Initial rate of increase in healthcare rate [member] \| UK Group plan [member]
Disclosure of defined benefit plans [line items]
Rate of increase in healthcare rate	0.00%	0.00%	0.00%
Initial rate of increase in healthcare rate [member] \| Other plans [member]
Disclosure of defined benefit plans [line items]
Rate of increase in healthcare rate	0.00%	0.00%	0.00%
Initial rate of increase in healthcare rate [member] \| PRMB [member]
Disclosure of defined benefit plans [line items]
Rate of increase in healthcare rate	6.80%	7.00%	6.50%
Ultimate rate of increase in healthcare rate [member] \| UK Group plan [member]
Disclosure of defined benefit plans [line items]
Rate of increase in healthcare rate	0.00%	0.00%	0.00%
Ultimate rate of increase in healthcare rate [member] \| Other plans [member]
Disclosure of defined benefit plans [line items]
Rate of increase in healthcare rate	0.00%	0.00%	0.00%
Ultimate rate of increase in healthcare rate [member] \| PRMB [member]
Disclosure of defined benefit plans [line items]
Rate of increase in healthcare rate	5.00%	5.00%	5.00%

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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 19
-IssueDate 2025-01-01
-Paragraph 144
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_144&doctype=Standard
-URIDate 2025-03-27

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

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- Definition

The expected rate of increases in pension that is used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [domain]; Defined benefit obligation, at present value; Actuarial assumptions [domain]]

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- Definition

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

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- Definition

Medical cost trend rate used as 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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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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