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Inventories and Supplies - Summary of Inventories and Supplies (Detail) - PHP (₱)
₱ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Inventories And Supplies [Line Items]    
Inventories and supplies ₱ 3,412 ₱ 2,878
Total inventories and supplies at the lower of cost or net realizable value 3,412 2,878
Terminal and cellular phone units [Member]    
Disclosure Of Inventories And Supplies [Line Items]    
Inventories net realizable value 2,358 2,093
Inventories and supplies 3,140 3,423
Spare parts and supplies [Member]    
Disclosure Of Inventories And Supplies [Line Items]    
Inventories net realizable value 462 173
Inventories and supplies 1,621 1,673
Others [Member]    
Disclosure Of Inventories And Supplies [Line Items]    
Inventories net realizable value 592 612
Inventories and supplies ₱ 954 ₱ 994