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Financial Assets and Liabilities - Summary of Impact of Hedged Items on Consolidated Statements of Financial Position (Detail) - Interest rate risk [member] - PHP (₱)
₱ in Millions
Dec. 31, 2021
Dec. 31, 2020
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 ₱ (1,303) ₱ (745)
Cost of hedging reserve 77 70
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 (438) (19)
Cost of hedging reserve 4 15
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)
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)
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 (8) (47)
Cost of hedging reserve 2 6
US$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 (1,011) (414)
Cost of hedging reserve 75 64
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)
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 (9) (18)
Cost of hedging reserve   ₱ 15
US$140M PNB [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 (429)  
Cost of hedging reserve ₱ 4