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Financial Assets and Liabilities - Summary of Derivative Financial Instruments (Parenthetical) (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2021 PHP (₱) USD ($) | Dec. 31, 2020 PHP (₱) | Dec. 31, 2019 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 Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Net Mark-to- market Gains (Losses) | (125,000,000) | (500,000,000) |
PLDT [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Net Mark-to- market Gains (Losses) | 14,000,000 | (5,000,000) |
PLDT [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Net Mark-to- market Gains (Losses) | (178,000,000) | (483,000,000) |
Smart [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Net Mark-to- market Gains (Losses) | 37,000,000 | (9,000,000) |
Smart [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Net Mark-to- market Gains (Losses) | 53,000,000 | (17,000,000) |
Interest Rate Swap Contract [Member] | PLDT [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Mark-to-market loss/gain | 1,000,000 | 16,000,000 |
Interest accrual | 3,000,000 | 9,000,000 |
Hedge cost portion of the movements in the fair value | 0 | 0 |
Interest Rate Swap Contract [Member] | Smart [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Mark-to-market loss/gain |  | 2,000,000 |
Interest accrual |  | 197,000 |
Hedge cost portion of the movements in the fair value | 0 | 0 |
Long Term Currency Swaps | PLDT [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Mark-to-market loss/gain | 4,000,000 | 46,000,000 |
Interest accrual | 2,000,000 | 6,000,000 |
Hedge cost portion of the movements in the fair value | 500,000 | 2,000,000 | ₱ 2,000,000
Long Term Currency Swaps | Smart [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Interest accrual | 201,000 | 2,000,000 |
Hedge cost portion of the movements in the fair value | 309,000 | 1,000,000 |
Net Mark-to- market Gains (Losses) | ₱ 9,000,000 | 13,000,000 |
Termination Date Various Dates in April and May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Foreign Exchange Options Capped Forward | PLDT [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 50.80 |  |
Net Mark-to- market Gains (Losses) | ₱ (2,000,000) |  |
Termination Date Various Dates in May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Foreign Exchange Options Seagull | PLDT [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 50.68 |  |
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 November Two Thousand Twenty One | Subsidized Forwards | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |  |
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] | Seagull | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 49.90 |  |
Termination Date January 23, 2031 [Member] | Long Term Foreign Currency Options | PLDT [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Mark-to-market loss/gain | ₱ 100,000,000 | 342,000,000 |
Interest accrual | 75,000,000 | 64,000,000 |
Hedge cost portion of the movements in the fair value | 89,000,000 | ₱ 26,000,000 |
Termination Date December Thirteen Two Thousand Thirty [Member] | Long Term Foreign Currency Options | Smart [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Mark-to-market loss/gain | 48,000,000 |  |
Interest accrual | 4,000,000 |  |
Hedge cost portion of the movements in the fair value | ₱ 8,000,000 |  |
Condition One | Termination Date Various Dates in April and May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Foreign Exchange Options Capped Forward | PLDT [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 52.17 |  |
Exchange rate, description | Php50.80 plus the excess above Php52.17 |  |
Condition One | Termination Date Various Dates in April and May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Bottom of range [member] | Foreign Exchange Options Capped Forward | PLDT [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 52.17 |  |
Condition One | Termination Date Various Dates in May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | PLDT [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 51.02 |  |
Condition One | Termination Date Various Dates in May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Foreign Exchange Options Seagull | PLDT [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 51.02 |  |
Condition One | Termination Date Various Dates in May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Bottom of range [member] | Foreign Exchange Options Seagull | PLDT [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 51.02 |  |
Condition One | Termination Date Various Dates in May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Top of range [member] | Foreign Exchange Options Seagull | PLDT [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 52.05 |  |
Condition One | Termination Date Various Dates in Two Thousand Twenty Two [Member] | Various Dates In November Two Thousand Twenty One | Subsidized Forwards | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |  |
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) |  |
Condition One | Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various Dates In November Two Thousand Twenty One | Subsidized Forwards | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Exchange rate, description | Php50.38 plus the excess above Php51.65 |  |
Condition One | Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various Dates In November Two Thousand Twenty One | Bottom of range [member] | Subsidized Forwards | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 51.65 |  |
Condition One | Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in November to December 2021 [Member] | Seagull | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 50.88 |  |
Condition One | Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in November to December 2021 [Member] | Bottom of range [member] | Seagull | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 50.88 |  |
Condition One | Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in November to December 2021 [Member] | Top of range [member] | Seagull | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 51.75 |  |
Condition One | Termination Date January 23, 2031 [Member] | US Dollar Liabilities [Member] | Various dates in July 2020 and February to March 2021 [Member] | Long Term Foreign Currency Options | PLDT [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 49.61 |  |
Condition One | Termination Date January 23, 2031 [Member] | US Dollar Liabilities [Member] | Various dates in July 2020 and February to March 2021 [Member] | Bottom of range [member] | Long Term Foreign Currency Options | PLDT [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 49.61 |  |
Condition One | Termination Date January 23, 2031 [Member] | US Dollar Liabilities [Member] | Various dates in July 2020 and February to March 2021 [Member] | Top of range [member] | Long Term Foreign Currency Options | PLDT [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 55.28 |  |
Condition One | Termination Date December Thirteen Two Thousand Thirty [Member] | US Dollar Liabilities [Member] | February To April Two Thousand Twenty One | Long Term Foreign Currency Options | Smart [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 48.00 |  |
Condition One | Termination Date December Thirteen Two Thousand Thirty [Member] | US Dollar Liabilities [Member] | February To April Two Thousand Twenty One | Bottom of range [member] | Long Term Foreign Currency Options | Smart [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 48.00 |  |
Condition One | Termination Date December Thirteen Two Thousand Thirty [Member] | US Dollar Liabilities [Member] | February To April Two Thousand Twenty One | Top of range [member] | Long Term Foreign Currency Options | Smart [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 53.34 |  |
Condition Two | Termination Date Various Dates in April and May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Foreign Exchange Options Capped Forward | PLDT [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 50.80 |  |
Condition Two | Termination Date Various Dates in April and May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Top of range [member] | Foreign Exchange Options Capped Forward | PLDT [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 52.17 |  |
Condition Two | Termination Date Various Dates in May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | PLDT [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 52.05 |  |
Condition Two | Termination Date Various Dates in May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Foreign Exchange Options Seagull | PLDT [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Exchange rate, description | Php51.02 plus the excess above Php52.05 |  |
Condition Two | Termination Date Various Dates in May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Bottom of range [member] | Foreign Exchange Options Seagull | PLDT [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 52.05 |  |
Condition Two | Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various Dates In November Two Thousand Twenty One | Subsidized Forwards | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 50.38 |  |
Condition Two | Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various Dates In November Two Thousand Twenty One | Bottom of range [member] | Subsidized Forwards | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 51.65 |  |
Condition Two | Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various Dates In November Two Thousand Twenty One | Top of range [member] | Subsidized Forwards | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 51.65 |  |
Condition Two | Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in November to December 2021 [Member] | Seagull | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 51.75 |  |
Exchange rate, description | Php50.88 plus the excess above Php51.75 |  |
Net Mark-to- market Gains (Losses) | ₱ (2,000,000) |  |
Condition Two | Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in November to December 2021 [Member] | Bottom of range [member] | Seagull | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 51.75 |  |
Condition Two | Termination Date January 23, 2031 [Member] | US Dollar Liabilities [Member] | Various dates in July 2020 and February to March 2021 [Member] | Long Term Foreign Currency Options | PLDT [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Foreign exchange rate subsidy | 5.67 |  |
Condition Two | Termination Date January 23, 2031 [Member] | US Dollar Liabilities [Member] | Various dates in July 2020 and February to March 2021 [Member] | Bottom of range [member] | Long Term Foreign Currency Options | PLDT [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 55.28 |  |
Condition Two | Termination Date December Thirteen Two Thousand Thirty [Member] | US Dollar Liabilities [Member] | February To April Two Thousand Twenty One | Long Term Foreign Currency Options | Smart [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Foreign exchange rate subsidy | 5.34 |  |
Condition Two | Termination Date December Thirteen Two Thousand Thirty [Member] | US Dollar Liabilities [Member] | February To April Two Thousand Twenty One | Bottom of range [member] | Long Term Foreign Currency Options | Smart [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 53.34 |  |
Condition Three | Termination Date Various Dates in May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Foreign Exchange Options Seagull | PLDT [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 50.68 |  |
Condition Three | Termination Date Various Dates in May Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in October 2021 [Member] | Top of range [member] | Foreign Exchange Options Seagull | PLDT [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 51.02 |  |
Condition Three | Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in November to December 2021 [Member] | Seagull | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 49.90 |  |
Condition Three | Termination Date Various Dates in Two Thousand Twenty Two [Member] | US Dollar Liabilities [Member] | Various dates in November to December 2021 [Member] | Top of range [member] | Seagull | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 50.88 |  |
Condition Three | Termination Date January 23, 2031 [Member] | US Dollar Liabilities [Member] | Various dates in July 2020 and February to March 2021 [Member] | Top of range [member] | Long Term Foreign Currency Options | PLDT [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 49.61 |  |
Condition Three | Termination Date December Thirteen Two Thousand Thirty [Member] | US Dollar Liabilities [Member] | February To April Two Thousand Twenty One | Top of range [member] | Long Term Foreign Currency Options | Smart [Member] | Transactions Designated As Hedges |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Weighted Average Foreign Exchange Rate | 48.00 |  |

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