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Financial Assets and Liabilities - Summary of Derivative Financial Instruments (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2019 PHP (₱) USD ($) EUR (€) | Dec. 31, 2018 PHP (₱)
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 1.00 |
Mark-to-market loss/gain | ₱ 11,000,000 | ₱ 129,000,000
Accrued interest income | 2,000,000 | 17,000,000
Fair value recognized | 0 | 0
Transactions Designated As Hedges |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Net Mark-to-market Gains (Losses) | (71,000,000) | 243,000,000
Long Term Currency Swaps | Transactions Designated As Hedges |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Interest accrual | 2,000,000 | 16,000,000
Hedge cost portion of the movements in the fair value | 1,000,000 | 2,000,000
Net Mark-to-market Gains (Losses) | (12,000,000) | 50,000,000
Long Term Currency Swaps | Transactions Designated As Hedges | PLDT [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Mark-to-market loss/gain | 23,000,000 | 45,000,000
Interest accrual | 7,000,000 | 3,000,000
Hedge cost portion of the movements in the fair value | 2,000,000 | 1,000,000
Interest rate swap contract [member] | Transactions Designated As Hedges |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Interest accrual | 3,000,000 | 18,000,000
Hedge cost portion of the movements in the fair value | 0 | 0
Net Mark-to-market Gains (Losses) | ₱ 6,000,000 | ₱ 63,000,000
E U R Assets | Weighted average [member] | Foreign Exchange Contracts |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | € | 1.185 |
Exchange rate, description | no |
Termination Date Various Dates In November Two Thousand Eighteen And December Two Thousand And Eighteen | E U R Assets | Various Dates In Two Thousand And Eighteen [Member] | Weighted average [member] | Foreign Exchange Contracts |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | € | 1.161 |
Termination Date Various Dates In Two Thousand Eighteen | US Dollar Liabilities [Member] | Various Dates In Two Thousand Seventeen And Two Thousand Eighteen | Foreign Exchange Contracts | Transactions Not Designated As Hedges [Member] | PLDT [Member] |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 50.64 |
Termination Date Various Dates In Two Thousand Eighteen | US Dollar Liabilities [Member] | Various Dates In Two Thousand Seventeen And Two Thousand Eighteen | Weighted average [member] | Foreign Exchange Contracts | Condition Three |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 51.58 |
Termination Date Various Dates In Two Thousand Eighteen | US Dollar Liabilities [Member] | Various Dates In Two Thousand Seventeen And Two Thousand Eighteen | Weighted average [member] | Foreign Exchange Contracts | Condition One |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Exchange rate, description | 52.48 |
Termination Date Various Dates In Two Thousand Eighteen | US Dollar Liabilities [Member] | Various Dates In Two Thousand Seventeen And Two Thousand Eighteen | Weighted average [member] | Foreign Exchange Contracts | Condition Two |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 52.48 |

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