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Tax - Summary of Unrecognised Deferred Tax Position (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Unrecognised deferred tax position [line items] |  |  |
Unrecognised deferred tax |  | $ 200 | $ 181
Gross carrying amount |  | 1,060 | 994
Revenue losses [member] |  |  |
Unrecognised deferred tax position [line items] |  |  |
Gross carrying amount |  | 467 | 413
Unrecognised deferred tax |  | 76 | 65
Capital losses [member] |  |  |
Unrecognised deferred tax position [line items] |  |  |
Gross carrying amount |  | 562 | 541
Unrecognised deferred tax |  | 109 | 95
Total losses [member] |  |  |
Unrecognised deferred tax position [line items] |  |  |
Gross carrying amount |  | 1,029 | 954
Unrecognised deferred tax |  | 185 | 160
Tax credits [member] |  |  |
Unrecognised deferred tax position [line items] |  |  |
Gross carrying amount |  | 12 | 13
Unrecognised tax credits deferred tax |  | 12 | 13
Other [member] |  |  |
Unrecognised deferred tax position [line items] |  |  |
Unrecognised deferred tax | [1] | 3 | 1
Gross carrying amount | [1] | $ 19 | 2
Leases [Member] |  |  |
Unrecognised deferred tax position [line items] |  |  |
Gross carrying amount |  |  | 25
Unrecognised deferred tax |  |  | $ 7
[1] | Primarily relates to costs incurred for which tax relief has not been obtained.

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- Definition The amount of deductible temporary differences for which no deferred tax asset is recognised in the statement of financial position. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of unused tax credits for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax credits [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of unused tax losses for which no deferred tax asset is recognised in the statement of financial position. [Refer: Unused tax losses [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2020-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_e&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Gross temporary differences and unused tax losses for which no deferred tax asset is recognised. + References No definition available. + Details
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- Definition Unrecognised deferred tax. + References No definition available. + Details
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- Definition Unrecognised deferred tax on temporary difference. + References No definition available. + Details
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- Definition Line items represent unrecognised deferred tax position. + References No definition available. + Details
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- Definition Unrecognised tax credits deferred tax. + References No definition available. + Details
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