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Tax - Summary of Unrecognised Deferred Tax Position (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Unrecognised Deferred Tax position [Line Items] |  |
Gross carrying amount | $ 967 | $ 993
Unrecognised deferred tax | 184 | 182
Gross carrying amount | 1,002 | 1,020
Revenue losses [member] |  |
Unrecognised Deferred Tax position [Line Items] |  |
Gross carrying amount | 452 | 518
Unrecognised deferred tax | 76 | 94
Capital losses [member] |  |
Unrecognised Deferred Tax position [Line Items] |  |
Gross carrying amount | 515 | 475
Unrecognised deferred tax | 99 | 83
Total losses [Member] |  |
Unrecognised Deferred Tax position [Line Items] |  |
Unrecognised deferred tax | 175 | 177
Other [member] |  |
Unrecognised Deferred Tax position [Line Items] |  |
Unrecognised deferred tax | 9 | 5
Gross carrying amount | $ 35 | $ 27

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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 2017-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_e&doctype=Standard -URIDate 2017-03-09 + 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 2017-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_e&doctype=Standard -URIDate 2017-03-09 + 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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