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Accounts Payable - Additional Information (Detail)
₱ in Millions
 12 Months Ended
Dec. 31, 2019
PHP (₱)
Trade Financing Arrangements [Member]  
Accounts Payable [Line Items]  
Amount reclassified from accounts payable ₱ 4,999
Trade Financing Arrangements [Member] | Parent [Member]  
Accounts Payable [Line Items]  
Trade receivables 1,799
Trade Financing Arrangements [Member] | Smart [Member]  
Accounts Payable [Line Items]  
Trade receivables ₱ 3,200
Top of range [member]  
Accounts Payable [Line Items]  
Accounts payable settlement period 180 days