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Retirement benefits - Defined Benefit Plan (Detail) - Net defined benefit liability (asset) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Changes in net defined benefit liability (asset) [abstract]
At 1 January	$ 68	$ 66	$ 66
Group contributions	(6)	(6)	(5)
Interest expense recognised in profit or loss	6	5	3
Actuarial (gains)/losses recognised in other comprehensive income	0	(4)	2
Exchange and other adjustments	1	7	0
At 31 December	69	68	66
Net defined benefit liability (asset)	69	68	66
United Kingdom | Unfunded Plans
Changes in net defined benefit liability (asset) [abstract]
Benefit obligation, unfunded plans	18	17	19
United States | Unfunded Plans
Changes in net defined benefit liability (asset) [abstract]
Benefit obligation, unfunded plans	30	31	34
Post-employment benefit plans	12	13	13
Other post-employment benefit plans | Unfunded Plans
Changes in net defined benefit liability (asset) [abstract]
Post-employment benefit plans	$ 9	$ 7	$ 0

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- References

No definition available.

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The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]]

+ References

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from miscellaneous other changes. [Refer: Net defined benefit liability (asset); Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss; Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income]

+ References

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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [domain]]

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Actuarial gain loss on remeasurement before exchange of net defined benefit liability ​asset.

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Value of benefit obligations relating to unfunded plans.

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Defined benefit obligation value of unfunded post employment plans.

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