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Equity - Summary of Number of Shares of Subscribed and Outstanding Capital Stock (Parenthetical) (Detail) - Series IV Cumulative Non-Convertible Redeemable Preferred Stock [Member] ₱ in Millions, shares in Millions | Dec. 31, 2021 PHP (₱) shares
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Disclosure Of Classes Of Share Capital [Line Items] |
Number of shares issued | shares | 300
Initial capitalization amount | ₱ 3,000
Number of shares issued, paid | ₱ 360

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