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Interest-bearing Financial Liabilities - Summary of Changes to Unamortized Debt Discount (Detail) - PHP (₱) ₱ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020
Disclosure Of Detailed Information About Borrowings [Abstract] |  |
Unamortized debt discount at beginning of the year | ₱ 1,262 | ₱ 491
Additions during the year | 1,768 | 927
Revaluations during the year | 13 | (10)
Accretion during the year included as part of financing costs – net (Note 5) | (186) | (146)
Unamortized debt discount at end of the year | ₱ 2,857 | ₱ 1,262

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