Investments in Associates and Joint Ventures - Changes in Accumulated Impairment Losses (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
Additional impairment (Note 4)	1,754	579	₱ 20
Balances at end of the year	53,364	52,123	53,863
Fixed asset impairment [Member]
Disclosure of Investments in Associates and Joint Ventures [Line Items]
Balances at beginning of the year	2,603	2,543
Additional impairment (Note 4)	60	60
Translation and other adjustments	92
Balances at end of the year	₱ 2,755	₱ 2,603	₱ 2,543

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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