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Retirement Benefit Obligations - Summary of Maturity Profile of the Group's Contracted Payments (On a Discounted Basis) (Detail) - Contractual Payments (on a discounted basis) [member] - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of Information About Maturity Profile of Group's Contracted Payments [line items]
Contractual payments to defined benefit scheme	$ 17	$ 20	$ 21
Within 1 year [member]
Disclosure of Information About Maturity Profile of Group's Contracted Payments [line items]
Contractual payments to defined benefit scheme	2	2	2
Between1 and 2 years [member]
Disclosure of Information About Maturity Profile of Group's Contracted Payments [line items]
Contractual payments to defined benefit scheme	2	2	2
Between 2 and 3 years [member]
Disclosure of Information About Maturity Profile of Group's Contracted Payments [line items]
Contractual payments to defined benefit scheme	2	2	2
Between 3 and 4 years [member]
Disclosure of Information About Maturity Profile of Group's Contracted Payments [line items]
Contractual payments to defined benefit scheme	2	2	2
Between 4 and 5 years [member]
Disclosure of Information About Maturity Profile of Group's Contracted Payments [line items]
Contractual payments to defined benefit scheme	2	2	2
After 5 years [member]
Disclosure of Information About Maturity Profile of Group's Contracted Payments [line items]
Contractual payments to defined benefit scheme	$ 7	$ 10	$ 11

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- Definition

Contractual payments to defined benefit scheme.

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No definition available.

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- Definition

Disclosure of information about maturity profile of group contracted payments.

+ References

No definition available.

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