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Financial Assets and Liabilities - Summary of Derivative Financial Instruments (Detail) | 12 Months Ended |  |
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Dec. 31, 2022 USD ($) | Dec. 31, 2022 PHP (₱) | Dec. 31, 2021 PHP (₱) | Dec. 31, 2022 PHP (₱) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 PHP (₱)
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Weighted Average Foreign Exchange Rate | 1.00 | 55.82 |  |  |  |
Net Mark-to- market Gains (Losses) |  | ₱ (1,069,000,000) | ₱ (74,000,000) |  |  |
Transactions Not Designated As Hedges [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Net Mark-to- market Gains (Losses) |  | (881,000,000) | 51,000,000 |  |  |
Transactions Not Designated As Hedges [Member] | PLDT [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Net Mark-to- market Gains (Losses) |  | (360,000,000) | 14,000,000 |  |  |
Transactions Not Designated As Hedges [Member] | Smart [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Net Mark-to- market Gains (Losses) |  | (521,000,000) | 37,000,000 |  |  |
Transactions Designated As Hedges |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Net Mark-to- market Gains (Losses) |  | (188,000,000) | (125,000,000) |  |  |
Transactions Designated As Hedges | PLDT [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Net Mark-to- market Gains (Losses) |  | (265,000,000) | (178,000,000) |  |  |
Transactions Designated As Hedges | Smart [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Net Mark-to- market Gains (Losses) |  | ₱ 77,000,000 | 53,000,000 |  |  |
Termination Date Various Dates in January to May 2023 [Member] | US Dollar Liabilities [Member] | Various dates in July to December 2022 [Member] | Transactions Not Designated As Hedges [Member] | Forward Foreign Exchange Contracts | PLDT [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Original Notional Amount | $ | $ 257,000,000 |  |  |  |  |
Trade Date | Various dates inJuly to December 2022 | Various dates inJuly to December 2022 |  |  |  |
Underlying Transaction | U.S. Dollar Liabilities | U.S. Dollar Liabilities |  |  |  |
Termination Date | Various dates inJanuary to May 2023 | Various dates inJanuary to May 2023 |  |  |  |
Weighted Average Foreign Exchange Rate |  | 57.16 |  |  |  |
Notional Amount | $ | $ 257,000,000 |  |  |  | $ 69,000,000 |
Net Mark-to- market Gains (Losses) |  | ₱ (353,000,000) | 17,000,000 |  |  |
Termination Date Various Dates in February to March 2023 [Member] | US Dollar Liabilities [Member] | Various dates in January 2023 [Member] | Transactions Not Designated As Hedges [Member] | Forward Foreign Exchange Contracts | PLDT [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Original Notional Amount | $ | $ 96,000,000 |  |  |  |  |
Trade Date | Various dates in January 2023 | Various dates in January 2023 |  |  |  |
Underlying Transaction | U.S. Dollar Liabilities | U.S. Dollar Liabilities |  |  |  |
Termination Date | Various dates in Februaryto March 2023 | Various dates in Februaryto March 2023 |  |  |  |
Weighted Average Foreign Exchange Rate |  | 54.97 |  |  |  |
Termination Date Various Dates in April and May 2022 [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Transactions Not Designated As Hedges [Member] | Forward 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 | Various dates in October 2021 |  |  |  |
Underlying Transaction | U.S. Dollar Liabilities | U.S. Dollar Liabilities |  |  |  |
Termination Date | Various dates in April and May 2022 | Various dates in April and 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 2022 [Member] | US Dollar Liabilities [Member] | Various Dates In November 2021 [Member] | Transactions Not Designated As Hedges [Member] | Forward Foreign Exchange Contracts | Smart [Member] | Condition One |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Notional Amount | $ |  |  |  |  | 2,000,000 |
Termination Date Various Dates in April and May 2022 [Member] | US Dollar Liabilities [Member] | Various Dates In November 2021 [Member] | Transactions Not Designated As Hedges [Member] | Subsidized Forwards | Smart [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Original Notional Amount | $ | $ 52,000,000 |  |  |  |  |
Trade Date | Various dates in November 2021 | Various dates in November 2021 |  |  |  |
Underlying Transaction | U.S. Dollar Liabilities | U.S. Dollar Liabilities |  |  |  |
Termination Date | Various dates in April and May 2022 | Various dates in April and May 2022 |  |  |  |
Weighted Average Foreign Exchange Rate |  | 50.38 |  |  |  |
Termination Date Various Dates in April and May 2022 [Member] | US Dollar Liabilities [Member] | Various Dates In November 2021 [Member] | 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 |  |  |  |
Net Mark-to- market Gains (Losses) |  |  | (1,000,000) |  |  |
Termination Date January 9, 2023 | US Dollar Liabilities [Member] | June 10, 2022 [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 | $ | $ 7,000,000 |  |  |  |  |
Trade Date | June 10, 2022 | June 10, 2022 |  |  |  |
Underlying Transaction | U.S. Dollar Liabilities | U.S. Dollar Liabilities |  |  |  |
Termination Date | January 9, 2023 | January 9, 2023 |  |  |  |
Weighted Average Foreign Exchange Rate |  | 52.64 |  |  |  |
Notional Amount |  |  |  | ₱ 7,000,000 |  | ₱ 4,000,000
Net Mark-to- market Gains (Losses) |  | ₱ (7,000,000) | (1,000,000) |  |  |
Termination Date January 9, 2023 | US Dollar Liabilities [Member] | June 10, 2022 [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 |  | 52.96 |  |  |  |
Termination Date January 9, 2023 | US Dollar Liabilities [Member] | June 10, 2022 [Member] | Transactions Not Designated As Hedges [Member] | Foreign Exchange Options Seagull | PLDT [Member] | Condition Two |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Weighted Average Foreign Exchange Rate |  | 54.00 |  |  |  |
Termination Date Various Dates in 2021 [Member] | US Dollar Liabilities [Member] | Various dates in 2020 and 2021 [Member] | Transactions Not Designated As Hedges [Member] | Forward Foreign Exchange Contracts | 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 | Various dates in 2020 and 2021 |  |  |  |
Underlying Transaction | U.S. Dollar Liabilities | U.S. Dollar Liabilities |  |  |  |
Termination Date | Various dates in 2021 | Various dates in 2021 |  |  |  |
Weighted Average Foreign Exchange Rate |  | 49.03 |  |  |  |
Termination Date Various Dates in January 2022 to June 2023 | US Dollar Liabilities [Member] | Various dates in July to December 2022 [Member] | Transactions Not Designated As Hedges [Member] | Forward Foreign Exchange Contracts | Smart [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Original Notional Amount | $ | $ 369,000,000 |  |  |  |  |
Trade Date | Various dates in July to December 2022 | Various dates in July to December 2022 |  |  |  |
Underlying Transaction | U.S. Dollar Liabilities | U.S. Dollar Liabilities |  |  |  |
Termination Date | Various dates in January 2022to June 2023 | Various dates in January 2022to June 2023 |  |  |  |
Weighted Average Foreign Exchange Rate |  | 57.08 |  |  |  |
Notional Amount | $ | $ 369,000,000 |  |  |  | 116,000,000 |
Net Mark-to- market Gains (Losses) |  | ₱ (481,000,000) | 40,000,000 |  |  |
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 | 52.96 | 52.96 |  |  |  |
Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various Dates In November 2021 [Member] | 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 | 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] | Condition One |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Weighted Average Foreign Exchange Rate | 53.37 | 53.37 |  |  |  |
Termination Date Various Dates in February to July 2023 | US Dollar Liabilities [Member] | Various Dates in January and February 2023 [Member] | Transactions Not Designated As Hedges [Member] | Forward Foreign Exchange Contracts | Smart [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Original Notional Amount | $ | $ 157,000,000 |  |  |  |  |
Trade Date | Various dates in January and February 2023 | Various dates in January and February 2023 |  |  |  |
Underlying Transaction | U.S. Dollar Liabilities | U.S. Dollar Liabilities |  |  |  |
Termination Date | Various dates in February to July 2023 | Various dates in February to July 2023 |  |  |  |
Weighted Average Foreign Exchange Rate |  | 54.93 |  |  |  |
Termination Date Various Dates in October 2022 to February 2023 | US Dollar Liabilities [Member] | Various Dates in June 2022 [Member] | Transactions Not Designated As Hedges [Member] | Foreign Exchange Options Seagull | Smart [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Original Notional Amount | $ | $ 71,000,000 |  |  |  |  |
Trade Date | Various dates in June 2022 | Various dates in June 2022 |  |  |  |
Underlying Transaction | U.S. Dollar Liabilities | U.S. Dollar Liabilities |  |  |  |
Termination Date | Various dates in October 2022 to February 2023 | Various dates in October 2022 to February 2023 |  |  |  |
Weighted Average Foreign Exchange Rate |  | 52.82 |  |  |  |
Termination Date Various Dates in October 2022 to February 2023 | US Dollar Liabilities [Member] | Various Dates in June 2022 [Member] | Transactions Not Designated As Hedges [Member] | Foreign Exchange Options Seagull | Smart [Member] | Condition One |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Weighted Average Foreign Exchange Rate |  | 53.37 |  |  |  |
Termination Date Various Dates in October 2022 to February 2023 | US Dollar Liabilities [Member] | Various Dates in June 2022 [Member] | Transactions Not Designated As Hedges [Member] | Foreign Exchange Options Seagull | Smart [Member] | Condition Two |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Weighted Average Foreign Exchange Rate |  | 54.46 |  |  |  |
Notional Amount | $ | $ 37,000,000 |  |  |  | 3,000,000 |
Net Mark-to- market Gains (Losses) |  | ₱ 40,000,000 | (2,000,000) |  |  |
Termination Date February 25, 2022 [Member] | Hundred Term Loan [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 | April and June 2015 |  |  |  |
Underlying Transaction | 200 Term Loan | 200 Term Loan |  |  |  |
Termination Date | February 25, 2022 | February 25, 2022 |  |  |  |
Weighted Average Hedge Cost | 2.70% | 2.70% |  |  |  |
Notional Amount | $ |  |  |  |  | 11,000,000 |
Net Mark-to- market Gains (Losses) |  |  | (5,000,000) |  |  |
Termination Date February 25, 2022 [Member] | US$200M 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 | November 2018 to August 2020 |  |  |  |
Underlying Transaction | 200 MUFG Bank, Ltd. | 200 MUFG Bank, Ltd. |  |  |  |
Termination Date | February 25, 2022 | February 25, 2022 |  |  |  |
Weighted Average Hedge Cost | 2.15% | 2.15% |  |  |  |
Weighted Average Foreign Exchange Rate |  | 50.78 |  |  |  |
Notional Amount | $ |  |  |  |  | 5,000,000 |
Net Mark-to- market Gains (Losses) |  |  | 2,000,000 |  |  |
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 | 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 February to March 2021 | Various dates inJuly 2020 and February to March 2021 |  |  |  |
Underlying Transaction | 300M Notes 2031 | 300M Notes 2031 |  |  |  |
Termination Date | January 23, 2031 | January 23, 2031 |  |  |  |
Weighted Average Hedge Cost | 1.20% | 1.20% |  |  |  |
Weighted Average Foreign Exchange Rate |  | 49.61 |  |  |  |
Notional Amount | $ | $ 290,000,000 |  |  |  | 290,000,000 |
Net Mark-to- market Gains (Losses) |  | ₱ (265,000,000) | (175,000,000) |  |  |
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 |  | 55.28 |  |  |  |
Termination Date December 7, 2021 [Member] | US$100M 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 | February 2016 |  |  |  |
Underlying Transaction | 100 Mizuho | 100 Mizuho |  |  |  |
Termination Date | December 7, 2021 | December 7, 2021 |  |  |  |
Weighted Average Hedge Cost | 2.03% | 2.03% |  |  |  |
Termination Date December 7, 2021 [Member] | US$100M 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 | February 2019 |  |  |  |
Underlying Transaction | 100 Mizuho | 100 Mizuho |  |  |  |
Termination Date | December 7, 2021 | December 7, 2021 |  |  |  |
Weighted Average Hedge Cost | 2.22% | 2.22% |  |  |  |
Weighted Average Foreign Exchange Rate |  | 51.83 |  |  |  |
Termination Date December 7, 2022 [Member] | US$100M 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 | August 2020 |  |  |  |
Underlying Transaction | 100 Mizuho | 100 Mizuho |  |  |  |
Termination Date | December 7, 2022 | December 7, 2022 |  |  |  |
Weighted Average Hedge Cost | 1.99% | 1.99% |  |  |  |
Weighted Average Foreign Exchange Rate |  | 48.64 |  |  |  |
Notional Amount | $ |  |  |  |  | 3,000,000 |
Net Mark-to- market Gains (Losses) |  |  | 9,000,000 |  |  |
Termination Date December 7, 2022 [Member] | US$100M Mizuho [Member] | August 2020 [Member] | Transactions Designated As Hedges | Long Term Currency Swaps | Smart [Member] | Condition One |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Weighted Average Foreign Exchange Rate |  | 48.00 |  |  |  |
Termination Date December 13, 2030 [Member] | One Hundred and Forty PNB [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 | February to April 2021 |  |  |  |
Underlying Transaction | 140 PNB | 140 PNB |  |  |  |
Termination Date | December 13, 2030 | December 13, 2030 |  |  |  |
Weighted Average Hedge Cost | 1.63% | 1.63% |  |  |  |
Weighted Average Foreign Exchange Rate |  | 53.34 |  |  |  |
Notional Amount | $ | $ 88,000,000 |  |  |  | $ 99,000,000 |
Net Mark-to- market Gains (Losses) |  | ₱ 77,000,000 | ₱ 44,000,000 |  |  |

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