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Tax - Summary of Unrecognized Deferred Tax Based on Expiry Date (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Unrecognised deferred tax position [line items] |  |
Unrecognised deferred tax | $ 181 | $ 171
2020 [Member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 2 |
2021 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 31 | 28
Unrecognised deferred tax | 6 | 6
2022 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 10 | 10
Unrecognised deferred tax | 2 | 2
2023 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 2 | 1
2024 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 4 | 4
Unrecognised deferred tax | 1 |
2025 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 91 | 92
Unrecognised deferred tax | 20 | 21
After 2025 [member] |  |
Unrecognised deferred tax position [line items] |  |
Gross carrying amount | 24 | 46
Unrecognised deferred tax | $ 17 | $ 3

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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 2019-01-01 -Paragraph 81 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2019-en-r&anchor=para_81_e&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition Unrecognised deferred tax. + References No definition available. + Details
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