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Tax - Deferred Tax - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure of income tax reconciliation [line items] |  |
Deferred tax assets | $ 147 | $ 113
Deferred tax asset recognised in respect of revenue losses | 114 | 89
Deferred tax assets recognized related to legal entities which suffered tax loss | 120 | 95
United Kingdom [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Deferred tax assets | $ 73 |
Deferred Tax Asset Offset Percentage On Annual Profits (50% restriction on deferred tax losses) | 50.00% |
Deferred Tax Assets Recognized Related To Profitable Legal Entities | $ 13 | 14
Difference between forecast and actual taxable profits for deferred tax asset to be extended | 20.00% |
United Kingdom [member] | Bottom of range [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Deferred Tax Asset Reverse Period | 7 years |
United Kingdom [member] | Top of range [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Deferred Tax Asset Reverse Period | 10 years |
Losses [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Deferred tax asset recognized in respect of losses | $ 84 | 61
Losses [member] | Revenue losses [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Deferred tax asset recognized in respect of losses | 84 | 60
Losses [member] | Capital losses [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Deferred tax asset recognized in respect of losses |  | 1
Unprovided deferred tax on unremitted earnings [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Unremitted earnings on which no deferred tax provided | $ 400 | $ 500

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- Definition The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Associates [member]; Subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries reported in separate financial statements] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_f&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Deferred tax assets recognised in loss making entities. + References No definition available. + Details
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