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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, 2019 | Dec. 31, 2018
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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 | ₱ (332) | ₱ (283)
Cost of hedging reserve | 8 | 4
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 | (34) | 50
Cost of hedging reserve | 17 | 16
Foreign currency exchange risk [Member] | Three Hundred Term Loan Member [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)
Cost of hedging reserve |  | 4
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) | (7)
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 | (48) | (3)
Cost of hedging reserve | 8 |
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 | (12) | 7
Cost of hedging reserve | 5 | 3
Foreign currency exchange risk [Member] | 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 | (22) | 43
Cost of hedging reserve | 12 | 13
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 | (11) | 129
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 | (57) | (22)
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) | 50
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 | (1) | 55
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) | 24
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) | (6)
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) | (2)
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 | (36) | (11)
Interest rate risk [member] | Two Thousand Fifteen Mizuho US Hundred [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) |
Interest rate risk [member] | 2013 Sumitomo US$120M [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 |  | ₱ (3)

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