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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
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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)

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