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Income Taxes - Additional Information (Detail) - PHP (₱)
₱ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Other Income Expense [Line Items]      
Consolidated unrecognized deferred income tax assets ₱ 2,294 ₱ 3,227  
MCIT 1,435    
Excess MCIT deducted against RCIT 206 488 ₱ 15
Expired portion of excess MCIT 10 1 72
NOLCO 4,762    
Deduction against taxable income 9,530 1,094 4,241
Expired portion of excess NOLCO 973 1,272 ₱ 354
Digitel and DMPI [Member]      
Disclosure Of Other Income Expense [Line Items]      
Consolidated unrecognized deferred income tax assets ₱ 1,362 ₱ 1,421  
Subic Tel and Clark Tel [Member]      
Disclosure Of Other Income Expense [Line Items]      
Special income tax rate as percentage of gross sales 5.00%