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Income and Expenses - Additional Information (Detail) - PHP (₱)
₱ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Analysis Of Contract Balances [Abstract]      
Decrease in trade and other receivables ₱ 1,219    
Decrease in contract assets 582    
Contract liabilities and unearned revenues 1,301    
Noncurrent portion of contract liabilities and unearned revenues 604 ₱ 532  
Current portion of contract liabilities and unearned revenues ₱ 7,879 6,650  
Decrease in service revenue and interconnection costs due to adjustments   ₱ 1,838 ₱ 993