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Employee benefit obligations - Employee obligations and assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of net defined benefit liability (asset) [line items]
Obligations	$ (305)	$ (324)
Assets	201	219
Net (obligations)/assets	(104)	(105)
Germany
Disclosure of net defined benefit liability (asset) [line items]
Obligations	(98)	(103)
Net (obligations)/assets	(98)	(103)
U.K
Disclosure of net defined benefit liability (asset) [line items]
Obligations	(133)	(145)
Assets	143	167
Net (obligations)/assets	10	22
U.S. and other*
Disclosure of net defined benefit liability (asset) [line items]
Obligations	(74)	(76)
Assets	58	52
Net (obligations)/assets	(16)	(24)
Other
Disclosure of net defined benefit liability (asset) [line items]
Net (obligations)/assets	$ (7)	$ (6)

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- Definition

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.

+ References

No definition available.

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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]]

+ References

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- Definition

The amount of 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]]

+ References

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- Definition

The amount of deficit in a defined benefit plan. [Refer: Defined benefit plans [domain]]

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