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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, 2018 | Dec. 31, 2017
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Foreign currency exchange risk [Member] | P L D T |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Cash flow hedge reserve | ₱ (283) | ₱ (170)
Cost of hedging reserve | 4 | 18
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 | 50 | 124
Cost of hedging reserve | 16 | 9
Foreign currency exchange risk [Member] | US$300M Term Loan [Member] | P L D T |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Cash flow hedge reserve | (273) | (171)
Cost of hedging reserve | 4 | 18
Foreign currency exchange risk [Member] | US$100M PNB [Member] | P L D T |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Cash flow hedge reserve | (7) |
Foreign currency exchange risk [Member] | US$200M MUFG Bank, Ltd. [Member] | P L D T |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Cash flow hedge reserve | (3) | 1
Foreign currency exchange risk [Member] | US$200M 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 | 7 | 65
Cost of hedging reserve | 3 | 7
Foreign currency exchange risk [Member] | US$100M Mizuho | 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 | 43 | 57
Cost of hedging reserve | 13 | 2
Foreign currency exchange risk [Member] | 2013 Chinabank US$80M [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
Interest rate risk [member] | P L D T |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Cash flow hedge reserve | 129 | 44
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 | (22) | 5
Interest rate risk [member] | US$100M PNB [Member] | P L D T |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Cash flow hedge reserve | 50 | 9
Interest rate risk [member] | US$200M MUFG Bank, Ltd. [Member] | P L D T |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Cash flow hedge reserve | 55 | 34
Interest rate risk [member] | US$50M MBTC [Member] | P L D T |  |
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items] |  |
Cash flow hedge reserve | 24 | 1
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 | (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 | (2) | 3
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 | (11) | 8
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 |  | 1
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) | (6)
Interest rate risk [member] | 2013 BTMU 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)

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