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Income Taxes - Summary of Changes in Consolidated Net Deferred Income Tax Assets (Liabilities) (Detail) - PHP (₱)
₱ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Major Components Of Tax Expense Income [Abstract]      
Net deferred income tax assets – balances at beginning of the year ₱ 23,623 ₱ 27,697  
Net deferred income tax liabilities – balances at beginning of the year (2,583) (2,981)  
Net balances at beginning of the year 21,040 24,716  
Movement charged directly to other comprehensive income 1,811 2,673  
Provision for deferred income tax (3,989) (6,267) ₱ (1,375)
Adjustments due to adoption of IFRS 16   (83)  
Others (32) 1  
Net balances at end of the period 18,830 21,040 24,716
Net deferred income tax assets – balances at end of the year 19,556 23,623 27,697
Net deferred income tax liabilities – balances at end of the year ₱ (726) ₱ (2,583) ₱ (2,981)