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Financial Assets and Liabilities - Summary of Derivative Financial Instruments (Detail)
 12 Months Ended
Dec. 31, 2019
PHP (₱)
USD ($)
Dec. 31, 2018
PHP (₱)
Disclosure of detailed information about financial instruments [Line Items]    
Weighted Average Foreign Exchange Rate 1.00  
Transactions Not Designated As Hedges [Member] | Foreign Exchange Options | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Weighted Average Foreign Exchange Rate 1.185  
Transactions Designated As Hedges    
Disclosure of detailed information about financial instruments [Line Items]    
Net Mark-to-market Gains (Losses) ₱ (71,000,000) ₱ 243,000,000
Transactions Designated As Hedges | Long Term Currency Swaps    
Disclosure of detailed information about financial instruments [Line Items]    
Net Mark-to-market Gains (Losses) (12,000,000) 50,000,000
Transactions Designated As Hedges | Long Term Currency Swaps | Smart [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Net Mark-to-market Gains (Losses) (5,000,000) 115,000,000
Two Hundred MUFG Bank Ltd [Member] | Transactions Designated As Hedges | Long Term Currency Swaps | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Net Mark-to-market Gains (Losses) (40,000,000) 188,000,000
Termination Date Various Dates In Two Thousand Eighteen | US Dollar Liabilities [Member] | Various Dates In Two Thousand Seventeen And Two Thousand Eighteen | Transactions Not Designated As Hedges [Member] | Forward Foreign Exchange Contracts [Member] | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 114,000,000  
Trade Date Various dates in 2017 and 2018  
Underlying Transaction U.S. Dollar Liabilities  
Termination Date Various dates in 2018  
Weighted Average Foreign Exchange Rate 51.68  
Termination Date Various Dates In Two Thousand Eighteen | US Dollar Liabilities [Member] | Various Dates In Two Thousand Seventeen And Two Thousand Eighteen | Transactions Not Designated As Hedges [Member] | Forward Foreign Exchange Contracts [Member] | Smart [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 120,000,000  
Trade Date Various dates in 2017 and 2018  
Underlying Transaction U.S. Dollar Liabilities  
Termination Date Various dates in 2018  
Weighted Average Foreign Exchange Rate 52.13  
Termination Date Various Dates In Two Thousand Eighteen | US Dollar Liabilities [Member] | Various Dates In Two Thousand Seventeen And Two Thousand Eighteen | Transactions Not Designated As Hedges [Member] | Foreign Exchange Options | Smart [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 4,000,000  
Trade Date Various dates in 2017 and 2018  
Underlying Transaction U.S. Dollar Liabilities  
Termination Date Various dates in 2018  
Weighted Average Foreign Exchange Rate 50.64  
Termination Date Various Dates in January Two Thousand and Twenty to April Two Thousand and Twenty [Member] | US Dollar Liabilities [Member] | Various Dates in Two Thousand And Nineteen [Member] | Transactions Not Designated As Hedges [Member] | Forward Foreign Exchange Contracts [Member] | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 22,000,000  
Trade Date Various dates in 2019  
Underlying Transaction U.S. Dollar Liabilities  
Termination Date Various dates in January 2020 to April 2020  
Weighted Average Foreign Exchange Rate 51.04  
Notional Amount ₱ 22,000,000 34,000,000
Net Mark-to-market Gains (Losses) (12,000,000) (22,000,000)
Termination Date December Fourteen Two Thousand Eighteen | E U R Assets | Various Dates In August Two Thousand And Eighteen [Member] | Transactions Not Designated As Hedges [Member] | Forward Foreign Exchange Contracts [Member] | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 9,000,000  
Trade Date Various dates in August 2018  
Underlying Transaction EUR Assets  
Termination Date December 14, 2018  
Weighted Average Foreign Exchange Rate 1.17  
Termination Date December Fourteen Two Thousand Eighteen | E U R Assets | Various Dates In Two Thousand And Eighteen [Member] | Transactions Not Designated As Hedges [Member] | Forward Foreign Exchange Contracts [Member] | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 11,000,000  
Trade Date Various dates in 2018  
Underlying Transaction EUR Assets  
Termination Date December 14, 2018  
Weighted Average Foreign Exchange Rate 62.95  
Termination Date January Two Thousand And Twenty | E U R Assets | Various dates in two thousand eighteen [Member] | Transactions Not Designated As Hedges [Member] | Forward Foreign Exchange Contracts [Member] | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 5,000,000  
Trade Date Various dates in July and August 2019  
Underlying Transaction EUR Assets  
Termination Date January 2020  
Weighted Average Foreign Exchange Rate 58.65  
Notional Amount ₱ 5,000,000  
Net Mark-to-market Gains (Losses) 8,000,000  
Termination date various dates in november and december two thousand and eighteen [Member] | E U R Assets | Various Dates In Two Thousand And Eighteen [Member] | Transactions Not Designated As Hedges [Member] | Foreign Exchange Options | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 36,000,000  
Trade Date Various dates in 2018  
Underlying Transaction EUR Assets  
Termination Date Various dates in November and December 2018  
Weighted Average Foreign Exchange Rate 1.161  
Termination Date Various Dates In Two Thousand Nineteen | US Dollar Liabilities [Member] | Various dates In Thousand Eighteen And Thousand Nineteen [Member] | Transactions Not Designated As Hedges [Member] | Forward Foreign Exchange Contracts [Member] | Smart [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 144,000,000  
Trade Date Various dates in 2018 and 2019  
Underlying Transaction U.S. Dollar Liabilities  
Termination Date Various dates in 2019  
Weighted Average Foreign Exchange Rate 52.73  
Notional Amount ₱ 23,000,000 54,000,000
Net Mark-to-market Gains (Losses)   (38,000,000)
Termination Date Various Dates In Two Thousand Nineteen | US Dollar Cash Conversion [Member] | Transactions Not Designated As Hedges [Member] | Forward Foreign Exchange Contracts [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Net Mark-to-market Gains (Losses) (26,000,000) (60,000,000)
Termination Date Various Dates In Two Thousand Nineteen | US Dollar Cash Conversion [Member] | Various Dates in Two Thousand And Nineteen [Member] | Transactions Not Designated As Hedges [Member] | Forward Foreign Exchange Contracts [Member] | PCEV [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 22,000,000  
Trade Date Various dates in 2019  
Underlying Transaction U.S. Dollar Cash Conversion  
Termination Date Various dates in 2019  
Weighted Average Foreign Exchange Rate 52.24  
Notional Amount ₱ 22,000,000  
Termination Date Various Dates In Two Thousand Twenty | US Dollar Liabilities [Member] | Various Dates in Two Thousand And Nineteen [Member] | Transactions Not Designated As Hedges [Member] | Forward Foreign Exchange Contracts [Member] | Smart [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 41,000,000  
Trade Date Various dates in 2019  
Underlying Transaction U.S. Dollar Liabilities  
Termination Date Various dates in 2020  
Weighted Average Foreign Exchange Rate 51.44  
Notional Amount ₱ 41,000,000  
Net Mark-to-market Gains (Losses) (22,000,000)  
Termination date various dates in two thousand twenty [Member] | US Dollar Liabilities [Member] | Various Dates In January And March Two Thousand Twenty | Transactions Not Designated As Hedges [Member] | Forward Foreign Exchange Contracts [Member] | Smart [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 16,000,000  
Trade Date Various dates in January and March 2020  
Underlying Transaction U.S. Dollar Liabilities  
Termination Date Various dates in March and May 2020  
Weighted Average Foreign Exchange Rate 50.79  
Termination Date January Sixteen Two Thousand Eighteen Member [Member] | Three Hundred Term Loan Member [Member] | Various Dates In Two Thousand Thirteen And Two Thousand Fifteen | Transactions Designated As Hedges | Interest Rate Swap1 | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 240,000,000  
Trade Date Various dates in 2013 and 2015  
Underlying Transaction 300 Term Loan  
Termination Date January 16, 2018  
Weighted Average Hedge Cost 2.17%  
Termination Date January Sixteen Two Thousand Eighteen Member [Member] | Three Hundred Term Loan Member [Member] | October Two Thousand Fifteen To June Two Thousand Sixteen Member [Member] | Transactions Designated As Hedges | Long Term Currency Swaps | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 140,000,000  
Trade Date October 2015 to June 2016  
Underlying Transaction 300 Term Loan  
Termination Date January 16, 2018  
Weighted Average Hedge Cost 2.20%  
Weighted Average Foreign Exchange Rate 46.67  
Termination Date August Eleven Two Thousand Twenty Member [Member] | Hundred PNB [Member] | August Two Thousands Fourteen Member [Member] | Transactions Designated As Hedges | Interest Rate Swap1 | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 100,000,000  
Trade Date August 2014  
Underlying Transaction 100 PNB  
Termination Date August 11, 2020  
Weighted Average Hedge Cost 3.46%  
Notional Amount ₱ 95,000,000 96,000,000
Net Mark-to-market Gains (Losses) (6,000,000) 55,000,000
Termination Date August Eleven Two Thousand Twenty Member [Member] | Hundred PNB [Member] | January Two Thousand Seventeen Member [Member] | Transactions Designated As Hedges | Long Term Currency Swaps | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 4,000,000  
Trade Date January 2017  
Underlying Transaction 100 PNB  
Termination Date August 11, 2020  
Weighted Average Hedge Cost 1.01%  
Weighted Average Foreign Exchange Rate 49.79  
Notional Amount ₱ 1,000,000 2,000,000
Net Mark-to-market Gains (Losses) 1,000,000 7,000,000
Termination Date September Two Two Thousand Twenty Member [Member] | Fifty Metro Bank Member [Member] | September Two Thousand Fourteen Member [Member] | Transactions Designated As Hedges | Interest Rate Swap1 | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 50,000,000  
Trade Date September 2014  
Underlying Transaction 50 Metrobank  
Termination Date September 2, 2020  
Weighted Average Hedge Cost 3.47%  
Notional Amount ₱ 48,000,000 48,000,000
Net Mark-to-market Gains (Losses) (5,000,000) 25,000,000
Termination Date February Twenty Five Two Thousand And Twenty Two [Member] | Two Hundred Term Loan Member [Member] | April And June Two Thousands Fifteen Member [Member] | Transactions Designated As Hedges | Interest Rate Swap1 | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 150,000,000  
Trade Date April and June 2015  
Underlying Transaction 200 Term Loan  
Termination Date February 25, 2022  
Weighted Average Hedge Cost 2.70%  
Notional Amount ₱ 56,000,000 79,000,000
Net Mark-to-market Gains (Losses) 2,000,000 66,000,000
Termination Date August Twenty Six Two Thousand Nineteen Member [Member] | Two Hundred MUFG Bank Ltd [Member] | April And June Two Thousands Seventeen [Member] | Transactions Designated As Hedges | Long Term Currency Swaps | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 6,000,000  
Trade Date April and June 2017  
Underlying Transaction 200 MUFG Bank, Ltd.  
Termination Date August 26, 2019  
Weighted Average Hedge Cost 1.63%  
Weighted Average Foreign Exchange Rate 49.51  
Notional Amount   3,000,000
Net Mark-to-market Gains (Losses)   9,000,000
Termination Date August Twenty Six Two Thousand Nineteen Member [Member] | Two Hundred MUFG Bank Ltd [Member] | January Two Thousand Eighteen [Member] | Transactions Designated As Hedges | Long Term Currency Swaps | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 2,000,000  
Trade Date January 2018  
Underlying Transaction 200 MUFG Bank, Ltd.  
Termination Date August 26, 2019  
Weighted Average Hedge Cost 1.59%  
Weighted Average Foreign Exchange Rate 49.86  
Notional Amount   1,000,000
Net Mark-to-market Gains (Losses)   3,000,000
Termination Date February Twenty Six Two Thousand and Twenty [Member] | Two Hundred MUFG Bank Ltd [Member] | February Two Thousand Eighteen [Member] | Transactions Designated As Hedges | Long Term Currency Swaps | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 6,000,000  
Trade Date February 2018  
Underlying Transaction 200 MUFG Bank, Ltd.  
Termination Date February 26, 2020  
Weighted Average Hedge Cost 1.82%  
Weighted Average Foreign Exchange Rate 51.27  
Notional Amount ₱ 1,000,000 5,000,000
Net Mark-to-market Gains (Losses) (2,000,000) 6,000,000
Termination Date February Twenty Five Two Thousand And Twenty Two [Member] | Two Hundred MUFG Bank Ltd [Member] | November Two Thousand Eighteen To June Two Thousand Nineteen | Transactions Designated As Hedges | Long Term Currency Swaps | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 22,000,000  
Trade Date November 2018 to June 2019  
Underlying Transaction 200 MUFG Bank, Ltd.  
Termination Date February 25, 2022  
Weighted Average Hedge Cost 2.28%  
Weighted Average Foreign Exchange Rate 52.08  
Notional Amount ₱ 17,000,000 11,000,000
Net Mark-to-market Gains (Losses) (30,000,000) 17,000,000
Termination Date June Twenty Two Thousand Eighteen [Member] | One Hundred Twenty Term Loan [Member] | Various Dates In Two Thousand Thirteen And Two Thousand Fourteen [Member] | Transactions Designated As Hedges | Interest Rate Swap1    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 110,000,000  
Trade Date Various dates in 2013 and 2014  
Underlying Transaction 120 Term Loan  
Termination Date June 20, 2018  
Weighted Average Hedge Cost 2.22%  
Termination Date March Seven Two Thousand Nineteen [Member] | Hundred Bank Of Tokyo [Member] | Various Dates Two Thousand Fourteen And Two Thousand Fifteen [Member] | Transactions Designated As Hedges | Interest Rate Swap1    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 85,000,000  
Trade Date Various dates in 2014 and 2015  
Underlying Transaction 100 Bank of Tokyo  
Termination Date March 7, 2019  
Weighted Average Hedge Cost 2.23%  
Notional Amount   10,000,000
Net Mark-to-market Gains (Losses)   3,000,000
Termination Date May Fourteen Two Thousand Nineteen [Member] | Fifty Mizuho [Member] | October Two Two Thousand Fourteen [Member] | Transactions Designated As Hedges | Interest Rate Swap1    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 50,000,000  
Trade Date October 2, 2014  
Underlying Transaction 50 Mizuho  
Termination Date May 14, 2019  
Weighted Average Hedge Cost 2.58%  
Notional Amount   5,000,000
Net Mark-to-market Gains (Losses)   2,000,000
Termination Date March Four Two Thousand Twenty [Member] | Two Hundred Mizuho [Member] | Various dates In Thousand Eighteen And Thousand Nineteen [Member] | Transactions Designated As Hedges | Long Term Currency Swaps | Smart [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 13,000,000  
Trade Date Various dates in 2018 and 2019  
Underlying Transaction 200 Mizuho  
Termination Date March 4, 2020  
Weighted Average Hedge Cost 2.06%  
Weighted Average Foreign Exchange Rate 51.93  
Notional Amount ₱ 4,000,000 9,000,000
Net Mark-to-market Gains (Losses) (6,000,000) 6,000,000
Termination Date March Four Two Thousand Twenty [Member] | Two Hundred Mizuho [Member] | Various Dates In Two Thousand Fifteen [Member] | Transactions Designated As Hedges | Interest Rate Swap1    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 200,000,000  
Trade Date Various dates in 2015  
Underlying Transaction 200 Mizuho  
Termination Date March 4, 2020  
Weighted Average Hedge Cost 2.10%  
Notional Amount ₱ 22,000,000 67,000,000
Net Mark-to-market Gains (Losses) 4,000,000 52,000,000
Termination Date December Seven Two Thousand Twenty One [Member] | Hundred Mizuho [Member] | February Two Thousand Sixteen [Member] | Transactions Designated As Hedges | Interest Rate Swap1    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 30,000,000  
Trade Date February 2016  
Underlying Transaction 100 Mizuho  
Termination Date December 7, 2021  
Weighted Average Hedge Cost 2.03%  
Notional Amount ₱ 12,000,000 18,000,000
Net Mark-to-market Gains (Losses) 5,000,000 24,000,000
Termination Date December Seven Two Thousand Twenty One [Member] | Two Thousand Fifteen Mizuho US Hundred [Member] | February Two Thousand Nineteen | Transactions Designated As Hedges | Long Term Currency Swaps | Smart [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 6,000,000  
Trade Date February 2019  
Underlying Transaction 2015 Mizuho US$100M  
Termination Date December 7, 2021  
Weighted Average Hedge Cost 2.22%  
Weighted Average Foreign Exchange Rate 51.83  
Notional Amount ₱ 4,000,000  
Net Mark-to-market Gains (Losses) (5,000,000)  
Termination Date March Five Two Thousand Eighteen [Member] | Two Hundred Mizuho [Member] | Various Dates In Two Thousand Fifteen [Member] | Transactions Designated As Hedges | Long Term Currency Swaps | Smart [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 100,000,000  
Trade Date Various dates in 2015  
Underlying Transaction 200 Mizuho  
Termination Date March 5, 2018  
Weighted Average Hedge Cost 2.21%  
Weighted Average Foreign Exchange Rate 46.66  
Termination Date December Seven Two Thousand Eighteen [Member] | Hundred Mizuho [Member] | Various Dates In Two Thousand Sixteen | Transactions Designated As Hedges | Long Term Currency Swaps | Smart [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 45,000,000  
Trade Date Various dates in 2016  
Underlying Transaction 100 Mizuho  
Termination Date December 7, 2018  
Weighted Average Hedge Cost 1.93%  
Weighted Average Foreign Exchange Rate 46.55  
Termination Date May Thirty One Two Thousand Eighteen [Member] | Eighty CBC [Member] | Various dates in two thousand seventeen [Member] | Transactions Designated As Hedges | Long Term Currency Swaps | Smart [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 11,000,000  
Trade Date Various dates in 2017  
Underlying Transaction 80 CBC  
Termination Date May 31, 2018  
Weighted Average Hedge Cost 1.28%  
Weighted Average Foreign Exchange Rate 49.66  
Termination Date December Seven Two Thousand Twenty [Member] | Hundred Mizuho [Member] | Various dates in two thousand seventeen two thousand eighteen and two thousand nineteen [Member] | Transactions Designated As Hedges | Long Term Currency Swaps | Smart [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Original Notional Amount ₱ 18,000,000  
Trade Date Various dates in 2017, 2018 and 2019  
Underlying Transaction 100 Mizuho  
Termination Date December 7, 2020  
Weighted Average Hedge Cost 1.77%  
Weighted Average Foreign Exchange Rate 50.98  
Notional Amount ₱ 9,000,000 16,000,000
Net Mark-to-market Gains (Losses) ₱ (3,000,000) ₱ 28,000,000