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Tax - Summary of Deferred Tax (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | $ 26 | $ 101
Income statement | 38 | (92)
Assets of businesses acquired | (3) |
Statement of comprehensive income | 4 | 13
Statement of changes in equity | 5 | 3
Exchange and other adjustments | 1 | 1
Ending balance | 71 | 26
Deferred gains on loan notes [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | 34 | 52
Income statement | 1 | (18)
Assets of businesses acquired | 0 |
Statement of comprehensive income | 0 |
Statement of changes in equity | 0 |
Exchange and other adjustments | 0 |
Ending balance | 35 | 34
Deferred gains on investments [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | 54 | 78
Income statement | 2 | (24)
Assets of businesses acquired | 0 |
Statement of comprehensive income | 0 |
Statement of changes in equity | 0 |
Exchange and other adjustments | 0 |
Ending balance | 56 | 54
Losses [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | (40) | (44)
Income statement | 4 | 1
Assets of businesses acquired | 0 |
Statement of comprehensive income | 0 |
Statement of changes in equity | 0 |
Exchange and other adjustments | 1 | 3
Ending balance | (35) | (40)
Employee benefits [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | (20) | (27)
Income statement | 0 | (4)
Assets of businesses acquired | 0 |
Statement of comprehensive income | 2 | 10
Statement of changes in equity | 0 |
Exchange and other adjustments | 0 | 1
Ending balance | (18) | (20)
Undistributed earnings of subsidiaries [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance |  | 59
Income statement | 2 | (61)
Assets of businesses acquired | 0 |
Statement of comprehensive income | 0 | (1)
Statement of changes in equity | 0 |
Exchange and other adjustments | 0 | 3
Ending balance | 2 |
Other short-term temporary differences [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | (82) | (96)
Income statement | (2) | 12
Assets of businesses acquired | (10) |
Statement of comprehensive income | 2 | 4
Statement of changes in equity | 5 | 3
Exchange and other adjustments | 0 | (5)
Ending balance | (87) | (82)
Property, plant, equipment and software [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | 98 | 120
Income statement | 26 | (22)
Assets of businesses acquired | (4) |
Statement of comprehensive income | 0 |
Statement of changes in equity | 0 |
Exchange and other adjustments | 0 |
Ending balance | 120 | 98
Other intangibles [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | 7 | (5)
Income statement | 9 | 13
Assets of businesses acquired | 11 |
Statement of comprehensive income | 0 |
Statement of changes in equity | 0 |
Exchange and other adjustments | 0 | (1)
Ending balance | 27 | 7
Application fees and contract costs [member] |  |
Disclosure of income tax reconciliation [line items] |  |
Beginning balance | (25) | (36)
Income statement | (4) | 11
Assets of businesses acquired | 0 |
Statement of comprehensive income | 0 |
Statement of changes in equity | 0 |
Exchange and other adjustments | 0 |
Ending balance | $ (29) | $ (25)

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- Definition The amount recognised as of the acquisition date for deferred tax assets acquired in a business combination. [Refer: Deferred tax assets; Business combinations [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 3 -IssueDate 2018-01-01 -Paragraph B64 -Subparagraph i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=3&date=2018-03-01&anchor=para_B64_i&doctype=Appendix&seq=2 -URIDate 2018-03-16 + Details
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- Definition The amount of tax expense or income relating to changes in deferred tax liabilities and deferred tax assets, recognised in profit or loss. [Refer: Deferred tax assets; Deferred tax expense (income); Deferred tax liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -Subparagraph g -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81_g_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The increase (decrease) in deferred tax liability (asset) resulting from the net exchange differences arising when the financial statements are translated from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Deferred tax liability (asset)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 12 -IssueDate 2018-01-01 -Paragraph 81 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2018-03-01&anchor=para_81&doctype=Standard -URIDate 2018-03-16 + Details
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