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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Investments in Associates and Joint Ventures - Summary of Investments in Beacon's shares (Parenthetical) (Detail) - PHP (₱) ₱ / shares in Units, ₱ in Millions, shares in Millions	May 12, 2010	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Investments in Associates and Joint Ventures [Line Items]
Investments in associates and joint ventures		₱ 53,863	₱ 55,427	₱ 46,130
Meralco [Member] \| Common Stock [Member]
Disclosure of Investments in Associates and Joint Ventures [Line Items]
Number of shares	154
Shares transferred per share	₱ 150.00
Investments in associates and joint ventures	₱ 23,130