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Financial Assets and Liabilities - Summary of Derivative Financial Instruments (Parenthetical) (Detail) |  | 12 Months Ended
--- | --- | ---
Feb. 21, 2021 | Dec. 31, 2020 PHP (₱) USD ($) | Dec. 31, 2019 PHP (₱)
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Mark-to-market loss/gain |  | ₱ 16,000,000 | ₱ 11,000,000
Accrued interest income |  | 9,000,000 | 2,000,000
Fair value recognized |  | ₱ 0 | 0
Exchange rate |  | 1.00 |
Termination Date Various Dates In Two Thousand Eighteen |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Exchange rate | 6.00 |  |
Termination Date Various Dates In Two Thousand Eighteen | US Dollar Liabilities [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Exchange rate | 48.00 |  |
Termination Date Various Dates In Two Thousand Eighteen | US Dollar Liabilities [Member] | Bottom of range [member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Exchange rate | 54.00 |  |
Termination Date Various Dates In Two Thousand Eighteen | US Dollar Liabilities [Member] | Top of range [member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Exchange rate | 48.00 |  |
PLDT [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Net Mark-to-market Gains (Losses) |  | ₱ (483,000,000) | (40,000,000)
Foreign Exchange Contracts | Termination Date in January 23, 2031 | US Dollar Liabilities [Member] | Various Dates In July Two Thousand Twenty | Weighted Average |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Foreign exchange rate subsidy |  | 6.00 |
Foreign Exchange Contracts | Termination Date in January 23, 2031 | Condition Three | US Dollar Liabilities [Member] | Various Dates In July Two Thousand Twenty | Weighted Average |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Exchange rate |  | 50.00 |
Foreign Exchange Contracts | Termination Date in January 23, 2031 | Condition One | US Dollar Liabilities [Member] | Various Dates In July Two Thousand Twenty | Weighted Average |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Exchange rate, description |  | 56.00 |
Foreign Exchange Contracts | Termination Date in January 23, 2031 | Condition Two | US Dollar Liabilities [Member] | Various Dates In July Two Thousand Twenty | Weighted Average |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Exchange rate |  | 56.00 |
Foreign Exchange Contracts | Termination Date in January 23, 2031 | Condition Four | US Dollar Liabilities [Member] | Various Dates In July Two Thousand Twenty | Weighted Average |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Exchange rate |  | 50.00 |
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 | PLDT [Member] | Long-term Foreign Currency Options [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Mark-to-market loss/gain |  | 342,000,000 |
Interest accrual |  | 64,000,000 |
Hedge cost portion of the movements in the fair value |  | 26,000,000 |
Transactions Designated As Hedges | Long Term Currency Swaps |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Interest accrual |  | 2,000,000 | 2,000,000
Hedge cost portion of the movements in the fair value |  | 1,000,000 | 1,000,000
Net Mark-to-market Gains (Losses) |  | (13,000,000) | 12,000,000
Transactions Designated As Hedges | Long Term Currency Swaps | PLDT [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Mark-to-market loss/gain |  | 46,000,000 | 23,000,000
Interest accrual |  | 6,000,000 | 7,000,000
Hedge cost portion of the movements in the fair value |  | 2,000,000 | 2,000,000
Transactions Designated As Hedges | Interest rate swap contract [member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Interest accrual |  | 197,000 | 3,000,000
Hedge cost portion of the movements in the fair value |  | 0 | 0
Net Mark-to-market Gains (Losses) |  | ₱ 2,000,000 | ₱ 6,000,000

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