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Tax - Deferred Tax - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of income tax reconciliation [line items] |  |  |
Deferred tax assets | $ 113 | $ 66 | $ 63
Deferred tax asset recognised in respect of revenue losses | 89 | 0 |
Deferred tax assets recognized related to legal entities which suffered tax loss | 95 | 4 |
United Kingdom [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Deferred tax assets recognized related to legal entities which suffered tax loss | 2 |  |
Deferred tax assets | $ 87 |  |
Deferred Tax Asset Reverse Period | 10 years |  |
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 | $ 14 |  |
Losses [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Deferred tax asset recognised in respect of revenue losses | 61 | 27 |
Losses [member] | Revenue losses [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Deferred tax asset recognised in respect of revenue losses | 60 | 27 |
Losses [member] | Capital losses [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Deferred tax asset recognised in respect of revenue losses | 1 | 0 |
Unprovided deferred tax on unremitted earnings [member] |  |  |
Disclosure of income tax reconciliation [line items] |  |  |
Unremitted earnings on which no deferred tax provided | $ 500 | $ 900 |

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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] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_f&doctype=Standard -URIDate 2020-01-01 + Details
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