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Financial Assets and Liabilities - Summary of Derivative Financial Instruments (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2024 PHP (₱) USD ($) | Dec. 31, 2023 PHP (₱)
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 1 |
Net Mark-to- market Gains (Losses) | ₱ 11,000,000 | ₱ (942,000,000)
Transactions Not Designated As Hedges [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Net Mark-to- market Gains (Losses) | 318,000,000 | (937,000,000)
Transactions Designated As Hedges |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Net Mark-to- market Gains (Losses) | 307,000,000 | 5,000,000
PLDT [Member] | Transactions Not Designated As Hedges [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Net Mark-to- market Gains (Losses) | (15,000,000) | (448,000,000)
PLDT [Member] | Transactions Designated As Hedges |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Net Mark-to- market Gains (Losses) | 164,000,000 | (87,000,000)
Smart [Member] | Transactions Not Designated As Hedges [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Net Mark-to- market Gains (Losses) | 26,000,000 | (494,000,000)
Smart [Member] | Transactions Designated As Hedges |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Net Mark-to- market Gains (Losses) | 143,000,000 | 92,000,000
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 | 239,000,000 | 119,000,000
Interest accrual | 75,000,000 |
Hedge cost portion of the movements in the fair value | 119,000,000 | 39,000,000
Long Term Foreign Currency Options | Smart [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Mark-to-market loss/gain | 145,000,000 | 96,000,000
Interest accrual | 3,000,000 | 3,000,000
Hedge cost portion of the movements in the fair value | ₱ 52,000,000 | 12,000,000
Termination Date Various dates in September 2024 to February 2025 [Member] | US Dollar Liabilities [Member] | Various dates in March to September 2024 [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 | 55.62 |
Net Mark-to- market Gains (Losses) | ₱ (1,000,000) |
Termination Date Various Dates in September 2024 to March 2025 [Member] | US Dollar Liabilities [Member] | Various dates in March to September 2024 [Member] | Foreign Exchange Options Seagull | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 55.87 |
Net Mark-to- market Gains (Losses) | ₱ (3,000,000) |
Termination Date Various Dates in February 2024 [Member] | US Dollar Liabilities [Member] | Various Dates in June 2023 [Member] | Foreign Exchange Options Seagull | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 55.17 |
Net Mark-to- market Gains (Losses) |  | ₱ (1,000,000)
Condition One | 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 | Long Term Foreign Currency Options | Smart [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 48 |
Condition One | 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 | Bottom of range [member] | Long Term Foreign Currency Options | Smart [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 48 |
Condition One | 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 | Top of range [member] | Long Term Foreign Currency Options | Smart [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 53.34 |
Condition One | Termination Date Various dates in September 2024 to February 2025 [Member] | US Dollar Liabilities [Member] | Various dates in March to September 2024 [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 | 56.07 |
Condition One | Termination Date Various dates in September 2024 to February 2025 [Member] | US Dollar Liabilities [Member] | Various dates in March to September 2024 [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 | 56.07 |
Condition One | Termination Date Various dates in September 2024 to February 2025 [Member] | US Dollar Liabilities [Member] | Various dates in March to September 2024 [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 | 57.07 |
Condition One | Termination Date Various dates in September 2024 to February 2025 [Member] | US Dollar Liabilities [Member] | Various dates in October to November 2024 [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 | 57.98 |
Condition One | Termination Date Various dates in September 2024 to February 2025 [Member] | US Dollar Liabilities [Member] | Various dates in October to November 2024 [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 | 59.48 |
Condition One | Termination Date Various Dates in September 2024 to March 2025 [Member] | US Dollar Liabilities [Member] | Various dates in March to September 2024 [Member] | Foreign Exchange Options Seagull | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 56.17 |
Condition One | Termination Date Various Dates in September 2024 to March 2025 [Member] | US Dollar Liabilities [Member] | Various dates in March to September 2024 [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 | 57.97 |
Condition One | Termination Date Various Dates in September 2024 to March 2025 [Member] | US Dollar Liabilities [Member] | Various dates in March to September 2024 [Member] | 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 | 59.26 |
Condition One | Termination Date Various Dates in February 2024 [Member] | US Dollar Liabilities [Member] | Various Dates in June 2023 [Member] | Foreign Exchange Options Seagull | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 55.85 |
Exchange rate, description | Php56.17. However, if on maturity, the exchange rate settles above Php56.17, Smart will purchase the U.S. Dollar for Php56.17 plus the excess above Php57.17 |
Condition One | Termination Date Various Dates in February 2024 [Member] | US Dollar Liabilities [Member] | Various Dates in June 2023 [Member] | Bottom of range [member] | Foreign Exchange Options Seagull | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 56.17 |
Condition One | Termination Date Various Dates in February 2024 [Member] | US Dollar Liabilities [Member] | Various Dates in June 2023 [Member] | Top of range [member] | Foreign Exchange Options Seagull | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 57.17 |
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 Not Designated As Hedges [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 57.9 |
Condition One | Termination Date December 13, 2030 [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 | 57.97 |
Condition Two | 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 | Long Term Foreign Currency Options | Smart [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 48 |
Exchange rate, description | Php48.00 plus the excess above Php53.34 |
Condition Two | 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 | Bottom of range [member] | Long Term Foreign Currency Options | Smart [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 53.34 |
Condition Two | Termination Date Various dates in September 2024 to February 2025 [Member] | US Dollar Liabilities [Member] | Various dates in March to September 2024 [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 | Php56.07 plus the excess above Php57.07 |
Condition Two | Termination Date Various dates in September 2024 to February 2025 [Member] | US Dollar Liabilities [Member] | Various dates in March to September 2024 [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 | 57.07 |
Condition Two | Termination Date Various dates in September 2024 to February 2025 [Member] | US Dollar Liabilities [Member] | Various dates in October to November 2024 [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 | Php57.98 plus the excess above Php59.48 |
Condition Two | Termination Date Various dates in September 2024 to February 2025 [Member] | US Dollar Liabilities [Member] | Various dates in October to November 2024 [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 | 59.48 |
Condition Two | Termination Date Various Dates in September 2024 to March 2025 [Member] | US Dollar Liabilities [Member] | Various dates in March to September 2024 [Member] | Foreign Exchange Options Seagull | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 57.17 |
Condition Two | Termination Date Various Dates in September 2024 to March 2025 [Member] | US Dollar Liabilities [Member] | Various dates in March to September 2024 [Member] | Long Term Foreign Currency Options | Smart [Member] | Transactions Designated As Hedges |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Exchange rate, description | Php57.97 plus the excess above Php59.26 |
Condition Two | Termination Date Various Dates in September 2024 to March 2025 [Member] | US Dollar Liabilities [Member] | Various dates in March to September 2024 [Member] | Bottom of range [member] | Long Term Foreign Currency Options | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 57.97 |
Condition Two | Termination Date Various Dates in September 2024 to March 2025 [Member] | US Dollar Liabilities [Member] | Various dates in March to September 2024 [Member] | 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 | 59.26 |
Condition Two | Termination Date Various Dates in February 2024 [Member] | US Dollar Liabilities [Member] | Various Dates in June 2023 [Member] | Foreign Exchange Options Seagull | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 55.87 |
Condition Two | Termination Date Various Dates in February 2024 [Member] | US Dollar Liabilities [Member] | Various Dates in June 2023 [Member] | Bottom of range [member] | Foreign Exchange Options Seagull | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 57.17 |
Condition Two | Termination Date Various Dates in February 2024 [Member] | US Dollar Liabilities [Member] | Various Dates in June 2023 [Member] | Bottom of range [member] | Long Term Foreign Currency Options | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 56.17 |
Condition Two | Termination Date Various Dates in February 2024 [Member] | US Dollar Liabilities [Member] | Various Dates in June 2023 [Member] | Top of range [member] | Foreign Exchange Options Seagull | Smart [Member] | Transactions Not Designated As Hedges [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 56.17 |
Condition Three | 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 Various dates in September 2024 to February 2025 [Member] | US Dollar Liabilities [Member] | Various dates in March to September 2024 [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 | 55.62 |
Condition Three | Termination Date Various dates in September 2024 to February 2025 [Member] | US Dollar Liabilities [Member] | Various dates in March to September 2024 [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 | 56.07 |
Condition Three | Termination Date Various dates in September 2024 to February 2025 [Member] | US Dollar Liabilities [Member] | Various dates in October to November 2024 [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 | 57.46 |
Condition Three | Termination Date Various dates in September 2024 to February 2025 [Member] | US Dollar Liabilities [Member] | Various dates in October to November 2024 [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 | 57.98 |
Condition Three | Termination Date Various Dates in September 2024 to March 2025 [Member] | US Dollar Liabilities [Member] | Various dates in March to September 2024 [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 | 57.64 |

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