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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Major Components Of Tax Expense Income [Abstract]      
Net deferred income tax assets – balances at beginning of the year ₱ 27,697 ₱ 30,466  
Net deferred income tax liabilities – balances at beginning of the year (2,981) (3,366)  
Net balances at beginning of the year 24,716 27,100  
Movement charged directly to other comprehensive income 2,673 591  
Adjustments due to adoption of IFRS 16 (83)    
Provision for deferred income tax (6,267) (1,375) ₱ 2,738
Excess MCIT deducted against RCIT due   (370)  
Adjustments due to adoption of IFRS 15   (1,166)  
Others 1 (64)  
Net balances at end of the year 21,040 24,716 27,100
Net deferred income tax assets – balances at end of the year 23,623 27,697 30,466
Net deferred income tax liabilities – balances at end of the year ₱ (2,583) ₱ (2,981) ₱ (3,366)