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Financial Assets And Liabilities - Summary of Impact of Hedged Items on Consolidated Statements of Financial Position (Detail) - PHP (₱)
₱ in Millions
Dec. 31, 2020
Dec. 31, 2019
Foreign currency exchange risk [Member] | PLDT [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Cash flow hedge reserve ₱ (745) ₱ (332)
Cost of hedging reserve 70 8
Foreign currency exchange risk [Member] | Smart [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Cash flow hedge reserve (19) (34)
Cost of hedging reserve 15 17
Foreign currency exchange risk [Member] | US$300M Term Loan [Member] | PLDT [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Cash flow hedge reserve (273) (273)
Foreign currency exchange risk [Member] | Hundred PNB [Member] | PLDT [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Cash flow hedge reserve (11) (11)
Foreign currency exchange risk [Member] | Two Hundred MUFG Bank Ltd [Member] | PLDT [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Cash flow hedge reserve (47) (48)
Cost of hedging reserve 6 8
Foreign currency exchange risk [Member] | 300M Notes 2031 [Member] | PLDT [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Cash flow hedge reserve (414)  
Cost of hedging reserve 64  
Foreign currency exchange risk [Member] | Two Hundred Mizuho [Member] | Smart [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Cash flow hedge reserve (1) (12)
Cost of hedging reserve   5
Foreign currency exchange risk [Member] | US$100M Mizuho [Member] | Smart [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Cash flow hedge reserve (18) (22)
Cost of hedging reserve 15 12
Interest rate risk [member] | PLDT [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Cash flow hedge reserve (16) (11)
Interest rate risk [member] | Smart [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Cash flow hedge reserve (8) (57)
Interest rate risk [member] | Hundred PNB [Member] | PLDT [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Cash flow hedge reserve   (6)
Interest rate risk [member] | Two Hundred MUFG Bank Ltd [Member] | PLDT [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Cash flow hedge reserve (16) (1)
Interest rate risk [member] | US$50M MBTC [Member] | PLDT [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Cash flow hedge reserve   (4)
Interest rate risk [member] | 2014 BTMU US$100M [Member] | Smart [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Cash flow hedge reserve   (1)
Interest rate risk [member] | 2014 Mizuho US$50M [Member] | Smart [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Cash flow hedge reserve   (1)
Interest rate risk [member] | 2015 Mizuho US$200M [Member] | Smart [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Cash flow hedge reserve (2) (36)
Interest rate risk [member] | 2015 Mizuho US$100M [Member] | Smart [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Cash flow hedge reserve ₱ (6) ₱ (19)