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Retirement Benefit Obligations - Summary of Reconciliation of Scheme Asset (Detail) - Plan assets [member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Disclosure of defined benefit plans [Line Items]
Beginning balance	$ 3,321	$ 3,013
Interest income on scheme assets	46	56
Remeasurement adjustments - return on scheme assets excluding interest income	165	174
Employer contributions paid	43	46
Contributions paid by plan participants	7	7
Benefit and settlement payments	(258)	(158)
Administration expenses	(4)	(5)
Translation adjustment	(146)	188
Ending balance	$ 3,174	$ 3,321

X

- Definition

Administrative expenses relating to pension plans.

+ References

No definition available.

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- Definition

Interest income on scheme assets.

+ References

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- Definition

Remeasurement adjustments-return on scheme assets excluding interest income.

+ References

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X

- Definition

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 [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
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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.

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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-Paragraph 141
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- Definition

The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2021-01-01
-Paragraph 141
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- Definition

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]]

+ References

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