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Tax - Deferred Tax - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of income tax reconciliation [Line Items] |  |  |
Deferred tax asset recognised in profit loss | $ (101) | $ (203) | $ (86)
Deferred tax assets recognized related to legal entities which suffered tax loss | 2 | 0 |
Uncertain tax positions included within deferred tax liability | 0 | 10 |
Uncertain tax positions offset from deferred tax asset | 5 | 2 |
Losses [member] |  |  |
Disclosure of income tax reconciliation [Line Items] |  |  |
Deferred tax asset recognised in profit loss | 40 | 44 | $ 67
Loans Notes [member] | 2025 [member] |  |  |
Disclosure of income tax reconciliation [Line Items] |  |  |
Deferred gains on loan notes |  | 59 |
Unprovided deferred tax on unremitted earnings [member] |  |  |
Disclosure of income tax reconciliation [Line Items] |  |  |
Unremitted earnings on which no deferred tax provided | $ 500 | $ 900 |

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- Definition The amount of deferred tax liabilities or assets. [Refer: Deferred tax liabilities; Deferred tax assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_g_i&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The aggregate amount of temporary differences associated with investments in subsidiaries, branches and associates and interests in joint arrangements, for which deferred tax liabilities have not been recognised as a result of satisfying both of the following conditions: (a) the parent, investor, joint venturer or joint operator is able to control the timing of the reversal of the temporary difference; and (b) it is probable that the temporary difference will not reverse in the foreseeable future. [Refer: Associates [member]; Subsidiaries [member]; Temporary differences [member]; Investments in subsidiaries] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2017-01-01 -Paragraph 81 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2017-03-01&anchor=para_81_f&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition Deferred Tax Assets Gains on loan notes. + References No definition available. + Details
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- Definition Line items represent reconciliation of changes in deferred tax liability (asset). + References No definition available. + Details
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- Details
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