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Interest-bearing Financial Liabilities - Summary of Changes to Unamortized Debt Discount (Detail) - PHP (₱)
₱ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Detailed Information About Borrowings [Abstract]      
Unamortized debt discount at beginning of the year ₱ 418 ₱ 525  
Additions during the year 195 38  
Accretion during the year included as part of Financing costs – net (Note 5) (122) (145) ₱ (219)
Unamortized debt discount at end of the year ₱ 491 ₱ 418 ₱ 525