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Retirement benefits - Defined Benefit Plans - Sensitivity Analysis of Actuarial Assumptions (Detail) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Discount rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Decrease in liabilities	$ 5	$ 5
Increase in liabilities	(5)	(5)
Inflation rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Decrease in liabilities	0	(1)
Increase in liabilities	0	0
Mortality rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Increase in liabilities	3	2
Healthcare costs trend rate
Disclosure of sensitivity analysis for actuarial assumptions [line items]
Decrease in liabilities	(1)	(1)
Increase in liabilities	$ 1	$ 1

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- Definition

The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]]

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The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]]

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