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Tax - Summary of Unrecognised Deferred Tax Position (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Unrecognised deferred tax position [line items] |  |
Unrecognised deferred tax | $ 181 | $ 171
Gross carrying amount | 994 | 1,013
Revenue losses [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 413 | 448
Unrecognised deferred tax | 65 | 67
Capital losses [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 541 | 516
Unrecognised deferred tax | 95 | 90
Total losses [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 954 | 964
Unrecognised deferred tax | 160 | 157
Other [member] |  |
Unrecognised deferred tax position [line items] |  |
Unrecognised deferred tax | 1 | 7
Gross carrying amount | 2 | 24
Foreign tax credit [Member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 13 |
Unrecognised tax credits deferred tax | 13 |
Leases [Member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 25 | 25
Unrecognised deferred tax | $ 7 | $ 7

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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 2019-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_e&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_e&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_e&doctype=Standard -URIDate 2019-03-27 + 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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