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Financial Assets and Liabilities - Summary of Derivative Financial Instruments (Detail) | 12 Months Ended
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Dec. 31, 2021 PHP (₱) USD ($) | Dec. 31, 2020 PHP (₱)
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 1.00 |
Net Mark-to- market Gains (Losses) | ₱ (74,000,000) | ₱ (514,000,000)
Transactions Not Designated As Hedges [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Net Mark-to- market Gains (Losses) | 51,000,000 | (14,000,000)
Transactions Not Designated As Hedges [Member] | PLDT [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Net Mark-to- market Gains (Losses) | 14,000,000 | (5,000,000)
Transactions Not Designated As Hedges [Member] | Smart [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Net Mark-to- market Gains (Losses) | 37,000,000 | (9,000,000)
Transactions Designated As Hedges |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Net Mark-to- market Gains (Losses) | (125,000,000) | (500,000,000)
Transactions Designated As Hedges | PLDT [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Net Mark-to- market Gains (Losses) | (178,000,000) | (483,000,000)
Transactions Designated As Hedges | Smart [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Net Mark-to- market Gains (Losses) | 53,000,000 | (17,000,000)
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) | 9,000,000 | 13,000,000
Termination Date Various dates in January to July Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October to December 2021 [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 | ₱ 69,000,000 |
Trade Date | Various dates inOctober to December 2021 |
Underlying Transaction | U.S. Dollar Liabilities |
Termination Date | Various dates inJanuary to July 2022 |
Weighted Average Foreign Exchange Rate | 50.90 |
Notional Amount | ₱ 69,000,000 | 13,000,000
Net Mark-to- market Gains (Losses) | 17,000,000 | (5,000,000)
Termination Date Various dates in June Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in January to February 2022 [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 | ₱ 8,000,000 |
Trade Date | Various dates inJanuary to February 2022 |
Underlying Transaction | U.S. Dollar Liabilities |
Termination Date | Various dates in June 2022 |
Weighted Average Foreign Exchange Rate | 51.38 |
Termination Date January Two Thousand and Twenty [Member] | EUR Assets [Member] | Various dates in July and August 2019 [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 inJuly and August 2019 |
Underlying Transaction | EUR Assets |
Termination Date | January 2020 |
Weighted Average Foreign Exchange Rate | 58.65 |
Termination Date Various Dates in April and May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Transactions Not Designated As Hedges [Member] | Foreign Exchange Options Capped Forward | PLDT [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Original Notional Amount | ₱ 6,000,000 |
Trade Date | Various dates in October 2021 |
Underlying Transaction | U.S. Dollar Liabilities |
Termination Date | Various dates in Apriland May 2022 |
Weighted Average Foreign Exchange Rate | 50.80 |
Notional Amount | ₱ 6,000,000 |
Net Mark-to- market Gains (Losses) | ₱ (2,000,000) |
Termination Date Various Dates in April and May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Transactions Not Designated As Hedges [Member] | Foreign Exchange Options Capped Forward | PLDT [Member] | Condition One |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 52.17 |
Termination Date Various Dates in April and May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Transactions Not Designated As Hedges [Member] | Foreign Exchange Options Capped Forward | PLDT [Member] | Condition Two |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 50.80 |
Termination Date Various Dates in May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Transactions Not Designated As Hedges [Member] | PLDT [Member] | Condition One |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 51.02 |
Termination Date Various Dates in May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Transactions Not Designated As Hedges [Member] | PLDT [Member] | Condition Two |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 52.05 |
Termination Date Various Dates in May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Transactions Not Designated As Hedges [Member] | Foreign Exchange Options Seagull | PLDT [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Original Notional Amount | ₱ 4,000,000 |
Trade Date | Various dates in October 2021 |
Underlying Transaction | U.S. Dollar Liabilities |
Termination Date | Various dates in May 2022 |
Weighted Average Foreign Exchange Rate | 50.68 |
Notional Amount | ₱ 4,000,000 |
Net Mark-to- market Gains (Losses) | ₱ (1,000,000) |
Termination Date Various Dates in May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Transactions Not Designated As Hedges [Member] | Foreign Exchange Options Seagull | PLDT [Member] | Condition One |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 51.02 |
Termination Date Various Dates In Two Thousand Twenty [Member] | US Dollar Liabilities [Member] | Various dates in 2019 and 2020 [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 | ₱ 133,000,000 |
Trade Date | Various dates in2019 and 2020 |
Underlying Transaction | U.S. Dollar Liabilities |
Termination Date | Various dates in 2020 |
Weighted Average Foreign Exchange Rate | 50.73 |
Termination Date Various Dates in Two Thousand Twenty One [Member] | US Dollar Liabilities [Member] | Various dates in 2020 and 2021 [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 | ₱ 332,000,000 |
Trade Date | Various dates in 2020 and 2021 |
Underlying Transaction | U.S. Dollar Liabilities |
Termination Date | Various dates in 2021 |
Weighted Average Foreign Exchange Rate | 49.03 |
Notional Amount |  | 26,000,000
Net Mark-to- market Gains (Losses) |  | (9,000,000)
Termination Date Various Dates in Two Thousand Twenty Two [Member] | Various Dates In November Two Thousand Twenty One | Transactions Not Designated As Hedges [Member] | Subsidized Forwards | Smart [Member] | Condition One |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 51.65 |
Notional Amount | ₱ 2,000,000 |
Net Mark-to- market Gains (Losses) | (1,000,000) |
Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October to December 2021 [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 | ₱ 116,000,000 |
Trade Date | Various dates in October toDecember 2021 |
Underlying Transaction | U.S. Dollar Liabilities |
Termination Date | Various dates in 2022 |
Weighted Average Foreign Exchange Rate | 50.83 |
Notional Amount | ₱ 116,000,000 |
Net Mark-to- market Gains (Losses) | 40,000,000 |
Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various Dates In November Two Thousand Twenty One | Transactions Not Designated As Hedges [Member] | Subsidized Forwards | Smart [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Original Notional Amount | ₱ 2,000,000 |
Trade Date | Various dates in November 2021 |
Underlying Transaction | U.S. Dollar Liabilities |
Termination Date | Various dates in 2022 |
Weighted Average Foreign Exchange Rate | 50.38 |
Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various Dates In November Two Thousand Twenty One | Transactions Not Designated As Hedges [Member] | Subsidized Forwards | Smart [Member] | Condition Two |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 50.38 |
Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in November to December 2021 [Member] | Transactions Not Designated As Hedges [Member] | Seagull | Smart [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Original Notional Amount | ₱ 3,000,000 |
Trade Date | Various dates in November toDecember 2021 |
Underlying Transaction | U.S. Dollar Liabilities |
Termination Date | Various dates in 2022 |
Weighted Average Foreign Exchange Rate | 49.90 |
Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in November to December 2021 [Member] | Transactions Not Designated As Hedges [Member] | Seagull | Smart [Member] | Condition One |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 50.88 |
Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in November to December 2021 [Member] | Transactions Not Designated As Hedges [Member] | Seagull | Smart [Member] | Condition Two |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 51.75 |
Notional Amount | ₱ 3,000,000 |
Net Mark-to- market Gains (Losses) | (2,000,000) |
Termination Date Various Dates in April to September Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in January to March 1, 2022 [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 | ₱ 30,000,000 |
Trade Date | Various dates in January toMarch 1, 2022 |
Underlying Transaction | U.S. Dollar Liabilities |
Termination Date | Various dates in April toSeptember 2022 |
Weighted Average Foreign Exchange Rate | 51.65 |
Termination Date Various Dates in May and July Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in January to February 2022 [Member] | Transactions Not Designated As Hedges [Member] | Seagull | Smart [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Original Notional Amount | ₱ 4,000,000 |
Trade Date | Various dates in January toFebruary 2022 |
Underlying Transaction | U.S. Dollar Liabilities |
Termination Date | Various dates in May andJuly 2022 |
Weighted Average Foreign Exchange Rate | 51.20 |
Termination Date Various Dates in May and July Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in January to February 2022 [Member] | Transactions Not Designated As Hedges [Member] | Seagull | Smart [Member] | Condition One |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 52.17 |
Termination Date Various Dates in May and July Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in January to February 2022 [Member] | Transactions Not Designated As Hedges [Member] | Seagull | Smart [Member] | Condition Two |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 52.96 |
Termination Date August Eleven Two Thousand Twenty Member [Member] | Hundred PNB [Member] | August 2014 [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% |
Termination Date August Eleven Two Thousand Twenty Member [Member] | Hundred PNB [Member] | January 2017 [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 |
Termination Date September Two Two Thousand Twenty Member [Member] | Fifty Metro Bank Member [Member] | September 2014 [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% |
Termination Date February Twenty Five Two Thousand And Twenty Two [Member] | Two Hundred Term Loan Member [Member] | April and June 2015 [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 | ₱ 11,000,000 | 34,000,000
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 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 2018to 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 | ₱ 5,000,000 | 16,000,000
Net Mark-to- market Gains (Losses) | 2,000,000 | (52,000,000)
Termination Date February Twenty Six Two Thousand and Twenty [Member] | Two Hundred MUFG Bank Ltd [Member] | February 2018 [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 |
Termination Date January 23, 2031 [Member] | US Dollar Liabilities [Member] | Various dates in July 2020 and February to March 2021 [Member] | Transactions Designated As Hedges | Long Term Foreign Currency Options | PLDT [Member] | Condition One |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 49.61 |
Termination Date January 23, 2031 [Member] | Three Hundred M Notes Two Thousand Thirty One | Various dates in July 2020 and February to March 2021 [Member] | Transactions Designated As Hedges | Long Term Foreign Currency Options | PLDT [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Original Notional Amount | ₱ 290,000,000 |
Trade Date | Various dates inJuly 2020 and Februaryto March 2021 |
Underlying Transaction | 300M Notes 2031 |
Termination Date | January 23, 2031 |
Weighted Average Hedge Cost | 1.20% |
Weighted Average Foreign Exchange Rate | 55.28 |
Notional Amount | ₱ 290,000,000 | 200,000,000
Net Mark-to- market Gains (Losses) | ₱ (175,000,000) | (406,000,000)
Termination Date January 23, 2031 [Member] | Three Hundred M Notes Two Thousand Thirty One | Various dates in July 2020 and February to March 2021 [Member] | Transactions Designated As Hedges | Long Term Foreign Currency Options | PLDT [Member] | Condition One |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 49.61 |
Termination Date March Four Two Thousand Twenty [Member] | Two Hundred Mizuho [Member] | Various dates in 2015 [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% |
Termination Date March Four Two Thousand Twenty [Member] | Two Hundred Mizuho [Member] | Various dates in 2018 and 2019 [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 datesin 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 |
Termination Date December Seven Two Thousand Twenty One [Member] | Hundred Mizuho [Member] | February 2016 [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 |  | 6,000,000
Net Mark-to- market Gains (Losses) |  | (2,000,000)
Termination Date December Seven Two Thousand Twenty One [Member] | Hundred Mizuho [Member] | February 2019 [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 |  | 2,000,000
Net Mark-to- market Gains (Losses) |  | (8,000,000)
Termination Date December Seven Two Thousand Twenty [Member] | Hundred Mizuho [Member] | Various dates in 2017, 2018 and 2019 [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 in2017, 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 |
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 | ₱ 3,000,000 | 6,000,000
Net Mark-to- market Gains (Losses) | 9,000,000 | ₱ (7,000,000)
Termination Date December Thirteen Two Thousand Thirty [Member] | Hundred and Forty [Member] | February to April 2021 [Member] | Transactions Designated As Hedges | Long Term Foreign Currency Options | Smart [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Original Notional Amount | ₱ 109,000,000 |
Trade Date | February to April 2021 |
Underlying Transaction | 140 PNB |
Termination Date | December 13, 2030 |
Weighted Average Hedge Cost | 1.63% |
Weighted Average Foreign Exchange Rate | 53.34 |
Notional Amount | ₱ 99,000,000 |
Net Mark-to- market Gains (Losses) | ₱ 44,000,000 |
Termination Date December Thirteen Two Thousand Thirty [Member] | Hundred and Forty [Member] | February to April 2021 [Member] | Transactions Designated As Hedges | Long Term Foreign Currency Options | Smart [Member] | Condition One |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 48.00 |

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