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Financial Assets and Liabilities - Summary of Consolidated Foreign Currency-denominated Monetary Financial Assets and Liabilities (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2018 PHP (₱) | Dec. 31, 2018 | Dec. 31, 2018 USD ($) | Dec. 31, 2017 PHP (₱) | Dec. 31, 2017 | Dec. 31, 2017 USD ($)
Disclosure Of Pre Tax Exposure To Foreign Currency Exchange Risk On Financial Instruments [Line Items] |  |  |  |  |  |
Weighted Average Foreign Exchange Rate |  | 52.56 |  |  |  |
Foreign currency exchange risk [Member] |  |  |  |  |  |
Disclosure Of Pre Tax Exposure To Foreign Currency Exchange Risk On Financial Instruments [Line Items] |  |  |  |  |  |
Weighted Average Foreign Exchange Rate | 52.56 | 52.56 | 1.00 | 49.96 | 49.96 | 1.00

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- Definition The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Disclosure Of Pre Tax Exposure To Foreign Currency Exchange Risk On Financial Instruments [Line Items] + References No definition available. + Details
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