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Accounts Payable - Additional Information (Detail) - PHP (₱)
₱ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Trade Financing Arrangements [Member]    
Accounts Payable [Line Items]    
Amount reclassified from accounts payable ₱ 1,155 ₱ 4,999
Trade Financing Arrangements [Member] | Parent [Member]    
Accounts Payable [Line Items]    
Trade receivables 400 1,799
Trade Financing Arrangements [Member] | Smart [Member]    
Accounts Payable [Line Items]    
Trade receivables ₱ 1,155 ₱ 3,200
Top of range [member]    
Accounts Payable [Line Items]    
Accounts payable settlement period 180 days