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Interest-bearing Financial Liabilities - Summary of Changes to Unamortized Debt Discount (Detail) - PHP (₱)
₱ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Detailed Information About Borrowings [Abstract]      
Unamortized debt discount at beginning of the year ₱ 491 ₱ 418  
Additions during the year 927 195  
Revaluations during the year (10)    
Accretion during the year included as part of financing costs – net (Note 5) (146) (122) ₱ (145)
Unamortized debt discount at end of the year ₱ 1,262 ₱ 491 ₱ 418