Investments in Associates and Joint Ventures - Changes in Cost of Investments (Detail) - PHP (₱) ₱ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disclosure of Investments in Associates and Joint Ventures [Line Items]
Balances at beginning of the year	₱ 52,123	₱ 53,863
Additions during the year	1,754	579	₱ 20
Balances at end of the year	53,364	52,123	53,863
Costs [Member]
Disclosure of Investments in Associates and Joint Ventures [Line Items]
Balances at beginning of the year	60,110	59,516
Additions during the year	1,777	609
Translation and other adjustments	99	(15)
Balances at end of the year	₱ 61,986	₱ 60,110	₱ 59,516

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]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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