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Tax - Summary of Unrecognized Deferred Tax Based on Expiry Date (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Unrecognised Deferred Tax position [Line Items] |  |
Gross carrying amount | $ 967 | $ 993
Unrecognised deferred tax | 184 | 182
2020 [member] |  |
Unrecognised Deferred Tax position [Line Items] |  |
Gross carrying amount |  | 3
Unrecognised deferred tax |  | 1
2021 [member] |  |
Unrecognised Deferred Tax position [Line Items] |  |
Gross carrying amount | 21 | 27
Unrecognised deferred tax | 5 | 7
2022 [member] |  |
Unrecognised Deferred Tax position [Line Items] |  |
Gross carrying amount | 11 | 11
Unrecognised deferred tax | 3 | 3
2023 [member] |  |
Unrecognised Deferred Tax position [Line Items] |  |
Gross carrying amount | 1 | 3
Unrecognised deferred tax |  | 1
2024 [Member] |  |
Unrecognised Deferred Tax position [Line Items] |  |
Gross carrying amount | 20 | 20
Unrecognised deferred tax | 1 | 1
After 2024 [Member] |  |
Unrecognised Deferred Tax position [Line Items] |  |
Gross carrying amount | 118 | 125
Unrecognised deferred tax | $ 26 | $ 25

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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 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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- Details
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- Details
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- Details
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