Investment Properties - Additional Information (Detail) - PHP (₱)	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Investment Property [Line Items]
Repairs and maintenance expenses related to investment properties that do not generate rental income	₱ 70,000,000	₱ 65,000,000	₱ 38,000,000
Rental income relating to investment properties	51,000,000	49,000,000	₱ 67,000,000
Transfers into of Level 3 of fair value hierarchy, investment properties	0	0
Transfers out of Level 3 of fair value hierarchy, investment properties	0	₱ 0
Investment Property [Member]
Disclosure Of Investment Property [Line Items]
Transfers into of Level 2 of fair value hierarchy, investment properties	0
Transfers out of Level 2 of fair value hierarchy, investment properties	0
Transfers into of Level 3 of fair value hierarchy, investment properties	0
Transfers out of Level 3 of fair value hierarchy, investment properties	0
Market Approach Using Price Per Square Meter [Member] \| Bottom of range [member]
Disclosure Of Investment Property [Line Items]
Valuation for land, price per square meter	33,000
Market Approach Using Price Per Square Meter [Member] \| Top of range [member]
Disclosure Of Investment Property [Line Items]
Valuation for land, price per square meter	₱ 33,000

The amount of direct operating expenses (including repairs and maintenance) arising from investment property that did not generate rental income during the period recognised in profit or loss. [Refer: Investment property]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 40
-IssueDate 2020-01-01
-Paragraph 75
-Subparagraph f
-Clause iii
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

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The amount of property, plant and equipment representing land held by the entity for use in operations. [Refer: Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
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-Number 16
-IssueDate 2020-01-01
-Paragraph 37
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- Definition

The amount of receivables arising from the rental of properties. Property is land or a building - or part of a building - or both.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2020-01-01
-Paragraph 78
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_b&doctype=Standard
-URIDate 2020-01-01

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The amount of transfers of assets into Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2020-01-01
-Paragraph 93
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-Clause iv
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2020-en-r&anchor=para_93_e_iv&doctype=Standard
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The amount of transfers of assets out of Level 3 of the fair value hierarchy. [Refer: Level 3 of fair value hierarchy [member]]

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Transfers into Level 2 of fair value hierarchy, assets.

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Amount before accumulated depletion of real estate held for productive use, excluding land held for sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.13)
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