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Retirement benefits - Defined Benefit Plans - Life Expectancy Assumptions at Retirement Age (Detail) - Plan	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
United Kingdom | Current pensioners at 65 - male
Disclosure Of Forecast Life Expectancies [line items]
Actuarial assumption of life expectancy after retirement	24 years	23 years	23 years
United Kingdom | Current pensioners at 65 - female
Disclosure Of Forecast Life Expectancies [line items]
Actuarial assumption of life expectancy after retirement	26 years	25 years	25 years
United Kingdom | Future pensioners at 65 - male
Disclosure Of Forecast Life Expectancies [line items]
Actuarial assumption of life expectancy after retirement	25 years	23 years	23 years
United Kingdom | Future pensioners at 65 - female
Disclosure Of Forecast Life Expectancies [line items]
Actuarial assumption of life expectancy after retirement	27 years	25 years	25 years
United States | Current pensioners at 65 - male
Disclosure Of Forecast Life Expectancies [line items]
Actuarial assumption of life expectancy after retirement	22 years	22 years	22 years
United States | Current pensioners at 65 - female
Disclosure Of Forecast Life Expectancies [line items]
Actuarial assumption of life expectancy after retirement	24 years	23 years	23 years
United States | Future pensioners at 65 - male
Disclosure Of Forecast Life Expectancies [line items]
Actuarial assumption of life expectancy after retirement	23 years	23 years	23 years
United States | Future pensioners at 65 - female
Disclosure Of Forecast Life Expectancies [line items]
Actuarial assumption of life expectancy after retirement	25 years	25 years	25 years

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- Definition

The life expectancy after retirement 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]]

+ References

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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- Definition

Disclosure Of Forecast Life Expectancies [line items]

+ References

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