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Interest-bearing Financial Liabilities - Summary of Changes to Unamortized Debt Discount (Detail) - PHP (₱)
₱ in Millions
 12 Months Ended
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