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Tax - Summary of Unrecognised Deferred Tax Position (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Unrecognised deferred tax position [line items] |  |
Unrecognised deferred tax | $ 163 | $ 184
Gross carrying amount | 989 | 1,002
Revenue losses [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 448 | 452
Unrecognised deferred tax | 67 | 76
Capital losses [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 516 | 515
Unrecognised deferred tax | 90 | 99
Total losses [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 964 | 967
Unrecognised deferred tax | 157 | 175
Other [member] |  |
Unrecognised deferred tax position [line items] |  |
Unrecognised deferred tax | 6 | 9
Gross carrying amount | $ 25 | $ 35

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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 2018-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_e&doctype=Standard -URIDate 2018-03-16 + 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 2018-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_e&doctype=Standard -URIDate 2018-03-16 + 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 Line items represent unrecognised deferred tax position. + References No definition available. + Details
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