The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 12
-IssueDate 2020-01-01
-Paragraph 81
-Subparagraph g
-Clause i
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-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 54
-Subparagraph o
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Income Taxes - Summary of Analysis of Net Deferred Income Tax Liabilities (Detail) - PHP (₱) ₱ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Deferred income tax liabilities	₱ (726)	₱ (2,583)	₱ (2,981)
Costs [Member] \| After 12 months [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Deferred income tax liabilities	(477)	(2,376)
Costs [Member] \| Within 12 months [Member]
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]
Deferred income tax liabilities	₱ (249)	₱ (207)