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Pensions and similar obligations - Summary of Net Liability for Post-employment and Long-term Employee Benefit Plans (Detail) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of defined benefit plans [abstract]
Present value of funded obligations	$ (4,209)	$ (4,090)
Fair value of plan assets	3,851	3,547
Present value of net obligations for funded plans	(358)	(543)
Present value of unfunded obligations	(562)	(542)
Present value of net obligations	(920)	(1,085)
Unrecognized asset	(95)	(63)	$ (38)	$ (43)
Net liability	(1,015)	(1,148)
Other long term employee benefits	(110)	(106)
Net liability	(1,125)	(1,254)
Employee benefits amounts in the statement of financial position:
Liabilities	(1,275)	(1,296)
Assets	150	42
Net liability	$ (1,125)	$ (1,254)

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- Definition

Defined benefit obligation excluding irrecoverable surplus.

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Irrecoverable surplus.

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- Definition

net defined benefit liability (asset) recognized in balance sheet [abstract]

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- Definition

Surplus deficit in funded plan.

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Surplus deficit in unfunded plan.

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- Definition

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]

+ 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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The amount of non-current net defined benefit asset. [Refer: Net defined benefit asset]

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The amount of non-current provisions other than provisions for employee benefits. [Refer: Non-current provisions]

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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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The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]]

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