Investments in Associates and Joint Ventures - Summary of Expected Credit Losses of Financial Assets (Detail) - PHP (₱) ₱ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Disclosure Of Joint Ventures [Line Items]
Balances as at beginning of the year	₱ 17,202
Balances at end of the year	16,825	₱ 17,202
Metro Pacific Investments Corporation [Member]
Disclosure Of Joint Ventures [Line Items]
Balances as at beginning of the year	2	2
Provisions	1	1
Financial assets derecognized during the year	(3)	(1)
Balances at end of the year		2
Metro Pacific Investments Corporation [Member] \| Stage 1 [Member] \| Lifetime ECL [Member]
Disclosure Of Joint Ventures [Line Items]
Balances as at beginning of the year	2	2
Provisions	1	1
Financial assets derecognized during the year	₱ (3)	(1)
Balances at end of the year		₱ 2

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 16
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-URIDate 2020-01-01

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- Definition

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.

+ References

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- Definition

The decrease in an allowance account for credit losses of financial assets resulting from the reversal of impairment. [Refer: Allowance account for credit losses of financial assets]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b
-URIDate 2020-01-01

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- Definition

Provisions for allowance account for credit losses of financial assets.

+ References

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