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Investments in Associates and Joint Ventures - Changes in Cost of Investments (Detail) - PHP (₱) ₱ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure of Investments in Associates and Joint Ventures [Line Items]
Balances at beginning of the year	₱ 53,863	₱ 55,427
Additions during the year	579	20	₱ 111
Balances at end of the year	52,123	53,863	55,427
Costs [Member]
Disclosure of Investments in Associates and Joint Ventures [Line Items]
Balances at beginning of the year	59,516	59,519
Additions during the year	609	80
Translation and other adjustments	(15)	(83)
Balances at end of the year	₱ 60,110	₱ 59,516	₱ 59,519

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- Definition

The amount of investments accounted for using the equity method. The equity method is a method of accounting whereby the investment is initially recognised at cost and adjusted thereafter for the post-acquisition change in the investor's share of net assets of the investee. The investor's profit or loss includes its share of the profit or loss of the investee. The investor's other comprehensive income includes its share of the other comprehensive income of the investee. [Refer: At cost [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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-IssueDate 2020-01-01
-Paragraph 24
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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X

- Definition

The cash outflow for the purchase of interests in investments accounted for using the equity method. [Refer: Investments accounted for using equity method]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2020-01-01
-Paragraph 16
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- Definition

Disclosure of investments in associates and joint ventures.

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- Definition

Investments in Associates and Joint Ventures, Translation And Other Adjustments

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