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Financial Assets and Liabilities - Summary of Derivative Financial Instruments (Detail) | 12 Months Ended
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Dec. 31, 2020 PHP (₱) USD ($) | Dec. 31, 2019 PHP (₱)
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 1.00 |
PLDT [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Net Mark-to-market Gains (Losses) | ₱ (483,000,000) | ₱ (40,000,000)
Transactions Designated As Hedges |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Net Mark-to-market Gains (Losses) | (514,000,000) | (71,000,000)
Transactions Designated As Hedges | Smart [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Net Mark-to-market Gains (Losses) | (17,000,000) | (5,000,000)
Transactions Designated As Hedges | Long Term Currency Swaps |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Net Mark-to-market Gains (Losses) | (13,000,000) | 12,000,000
Termination Date Various dates in January to April Two Thousand Twenty One [Member] | US Dollar Liabilities [Member] | Various Dates in October Two Thousand Twenty to January Two Thousand Twenty One [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 | ₱ 16,000,000 |
Trade Date | Various dates in October 2020 to January 2021 |
Underlying Transaction | U.S. Dollar Liabilities |
Termination Date | Various dates in January to April 2021 |
Weighted Average Foreign Exchange Rate | 48.40 |
Notional Amount | ₱ 13,000,000 | 22,000,000
Net Mark-to-market Gains (Losses) | (5,000,000) | (12,000,000)
Termination Date Various Dates in March to June Two Thousand Twenty One [Member] | US Dollar Liabilities [Member] | January to February Two Thousand Twenty One [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 | ₱ 45,000,000 |
Trade Date | January to February 2021 |
Underlying Transaction | U.S. Dollar Liabilities |
Termination Date | Various dates in March to June 2021 |
Weighted Average Foreign Exchange Rate | 48.26 |
Termination Date January Two Thousand and Twenty [Member] | E U R Assets | Various dates in July and August Two Thousand 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 | ₱ 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 Two Thousand Nineteen | US Dollar Liabilities [Member] | Various dates in Two Thousand Eighteen and Two 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 |
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) | ₱ (14,000,000) | (26,000,000)
Termination Date Various Dates In Two Thousand Nineteen | US Dollar Cash Conversion [Member] | Various Dates In Two Thousand 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 |
Termination Date Various Dates In Two Thousand Twenty [Member] | US Dollar Liabilities [Member] | Various dates in Two Thousand Nineteen and Two Thousand Twenty [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 | ₱ 260,000,000 |
Trade Date | Various dates in 2019 and 2020 |
Underlying Transaction | U.S. Dollar Liabilities |
Termination Date | Various dates in 2020 |
Weighted Average Foreign Exchange Rate | 50.77 |
Notional Amount |  | 41,000,000
Net Mark-to-market Gains (Losses) |  | (22,000,000)
Termination Date Various Dates in Two Thousand Twenty One [Member] | US Dollar Liabilities [Member] | Various Dates in Two Thousand Twenty One [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 | ₱ 26,000,000 |
Trade Date | Various dates in 2020 |
Underlying Transaction | U.S. Dollar Liabilities |
Termination Date | Various dates in 2021 |
Weighted Average Foreign Exchange Rate | 48.44 |
Notional Amount | ₱ 26,000,000 |
Net Mark-to-market Gains (Losses) | (9,000,000) |
Termination Date Various Dates in February to June Two Thousand Twenty One [Member] | US Dollar Liabilities [Member] | January to March Two Thousand Twenty One [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 | ₱ 69,000,000 |
Trade Date | January to March 2021 |
Underlying Transaction | U.S. Dollar Liabilities |
Termination Date | February to June 2021 |
Weighted Average Foreign Exchange Rate | 48.42 |
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
Net Mark-to-market Gains (Losses) |  | (6,000,000)
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
Net Mark-to-market Gains (Losses) |  | 1,000,000
Termination Date January 23, 2031 [Member] | 300M Notes 2031 [Member] | Various Dates in July Two Thousand Twenty and February Two Thousand Twenty One [Member] | Transactions Designated As Hedges | Long-term Foreign Currency Options [Member] | PLDT [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Original Notional Amount | ₱ 200,000,000 |
Trade Date | Various dates in July 2020 and February 2021 |
Underlying Transaction | 300M Notes 2031 |
Termination Date | January 23, 2031 |
Weighted Average Hedge Cost | 1.26% |
Weighted Average Foreign Exchange Rate | 56.00 |
Notional Amount | ₱ 200,000,000 |
Net Mark-to-market Gains (Losses) | ₱ (406,000,000) |
Termination Date January 23, 2031 [Member] | 300M Notes 2031 [Member] | Various Dates in July Two Thousand Twenty and February Two Thousand Twenty One [Member] | Transactions Designated As Hedges | Long-term Foreign Currency Options [Member] | PLDT [Member] | Condition One |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 50.00 |
Termination Date January 23, 2031 [Member] | 300M Notes 2031 [Member] | February to March Two Thousand Twenty One [Member] | Transactions Designated As Hedges | Long-term Foreign Currency Options [Member] | PLDT [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Original Notional Amount | ₱ 80,000,000 |
Trade Date | February to March 2021 |
Underlying Transaction | 300M Notes 2031 |
Termination Date | January 23, 2031 |
Weighted Average Hedge Cost | 1.07% |
Weighted Average Foreign Exchange Rate | 53.69 |
Termination Date January 23, 2031 [Member] | 300M Notes 2031 [Member] | February to March Two Thousand Twenty One [Member] | Transactions Designated As Hedges | Long-term Foreign Currency Options [Member] | PLDT [Member] | Condition One |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 48.75 |
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
Net Mark-to-market Gains (Losses) |  | (5,000,000)
Termination Date September Two Two Thousand Twenty Member [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 | ₱ 34,000,000 | 56,000,000
Net Mark-to-market Gains (Losses) | (25,000,000) | 2,000,000
Termination Date March Seven Two Thousand Nineteen [Member] | Hundred Bank Of Tokyo | Various dates in 2014 and 2015 [Member] | Transactions Designated As Hedges | Interest Rate Swap1 | Smart [Member] |  |
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% |
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 |
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 |
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
Net Mark-to-market Gains (Losses) |  | (2,000,000)
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 | 1.76% |
Weighted Average Foreign Exchange Rate | 50.98 |
Notional Amount | ₱ 4,000,000 | 9,000,000
Net Mark-to-market Gains (Losses) |  | (3,000,000)
Termination Date February Twenty Five Two Thousand And Twenty Two [Member] | Two Hundred MUFG Bank Ltd [Member] | November 2018 to August 2020 [Member] | Transactions Designated As Hedges | Long Term Currency Swaps | PLDT [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Original Notional Amount | ₱ 27,000,000 |
Trade Date | November 2018 to August 2020 |
Underlying Transaction | 200 MUFG Bank, Ltd. |
Termination Date | February 25, 2022 |
Weighted Average Hedge Cost | 2.15% |
Weighted Average Foreign Exchange Rate | 50.78 |
Notional Amount | ₱ 16,000,000 | 17,000,000
Net Mark-to-market Gains (Losses) | (52,000,000) | (30,000,000)
Termination Date May Fourteen Two Thousand Nineteen [Member] | Fifty Mizuho [Member] | October Two Two Thousand Fourteen [Member] | Transactions Designated As Hedges | Interest Rate Swap1 | Smart [Member] |  |
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% |
TerminationDateDecemberThirteenTwoThousandThirtyMember | Hundred PNB [Member] | February to March Two Thousand Twenty One [Member] | Transactions Designated As Hedges | Long-term Foreign Currency Options [Member] | Smart [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Original Notional Amount | ₱ 80,000,000 |
Trade Date | February to March 2021 |
Underlying Transaction | 140 PNB |
Termination Date | December 13, 2030 |
Weighted Average Hedge Cost | 1.64% |
Weighted Average Foreign Exchange Rate | 53.48 |
TerminationDateDecemberThirteenTwoThousandThirtyMember | Hundred PNB [Member] | February to March Two Thousand Twenty One [Member] | Transactions Designated As Hedges | Long-term Foreign Currency Options [Member] | Smart [Member] | Condition One |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 48.00 |
Termination Date March Four Two Thousand Twenty [Member] | Two Hundred Mizuho [Member] | Various dates in 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 | ₱ 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
Net Mark-to-market Gains (Losses) |  | (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 | Smart [Member] |  |
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
Net Mark-to-market Gains (Losses) |  | 4,000,000
Termination Date December Seven Two Thousand Twenty One [Member] | Hundred Mizuho [Member] | February Two Thousand Sixteen [Member] | Transactions Designated As Hedges | Interest Rate Swap1 | Smart [Member] |  |
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 | ₱ 9,000,000 | 12,000,000
Net Mark-to-market Gains (Losses) | (2,000,000) | 5,000,000
Termination Date December Seven Two Thousand Twenty One [Member] | Hundred Mizuho [Member] | February 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 | ₱ 6,000,000 |
Trade Date | February 2019 |
Underlying Transaction | 100 Mizuho |
Termination Date | December 7, 2021 |
Weighted Average Hedge Cost | 2.22% |
Weighted Average Foreign Exchange Rate | 51.83 |
Notional Amount | ₱ 3,000,000 | 4,000,000
Net Mark-to-market Gains (Losses) | (8,000,000) | ₱ (5,000,000)
Termination Date December Seven Two Thousand Twenty Two [Member] | Hundred Mizuho [Member] | August 2020 [Member] | 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 | August 2020 |
Underlying Transaction | 100 Mizuho |
Termination Date | December 7, 2022 |
Weighted Average Hedge Cost | 1.99% |
Weighted Average Foreign Exchange Rate | 48.64 |
Notional Amount | ₱ 6,000,000 |
Net Mark-to-market Gains (Losses) | ₱ (7,000,000) |

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