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Financial Instruments - Summary of Cash Flows Hedge Exposures (Detail) - Foreign exchange currency risk [member] - Purchase of stock [member] - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of detailed information about hedged items [line items] |  |
Cash flow hedge reserve | $ 1 |
Cash flow hedge costs | 22 | $ 11
Remained balances of cash flow hedge reserve from which hedging accounting is not applied | $ 0 | $ 0

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- Definition Cash flow hedge costs. + References No definition available. + Details
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- Definition A component of equity representing the reserve of cash flow hedges in relation to continuing hedges. [Refer: Reserve of cash flow hedges] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 24B -Subparagraph b -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24B_b_ii&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition A component of equity representing the reserve of cash flow hedges in relation to hedging relationships for which hedge accounting is no longer applied. [Refer: Reserve of cash flow hedges] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2018-01-01 -Paragraph 24B -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2018-03-01&anchor=para_24B_b_iii&doctype=Standard -URIDate 2018-03-16 + Details
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- Details
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- Details
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