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Financial Assets and Liabilities - Summary of Derivative Financial Instruments (Parenthetical) (Detail) | 12 Months Ended
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Dec. 31, 2018 PHP (₱) EUR (€) | Dec. 31, 2017 PHP (₱)
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 52.56 |
Mark-to-market gains | ₱ 129,000,000 | ₱ (44,000,000)
Accrued interest income | 17,000,000 | 11,000,000
Fair value recognized | 0 | 0
Long Term Currency Swaps [Member] | Transactions Designated As Hedges |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Interest accrual | 16,000,000 | 9,000,000
Hedge cost portion of the movements in the fair value | 2,000,000 | 4,000,000
Net Mark-to-Market Gains (Losses) | 50,000,000 | 124,000,000
Long Term Currency Swaps [Member] | Transactions Designated As Hedges | P L D T |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Mark-to-market gains | 45,000,000 | 108,000,000
Interest accrual | 3,000,000 | 18,000,000
Hedge cost portion of the movements in the fair value | 1,000,000 | 3,000,000
Interest rate swap contract [member] | Transactions Designated As Hedges |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Interest accrual | 18,000,000 | 4,000,000
Hedge cost portion of the movements in the fair value | 0 | 0
Net Mark-to-Market Gains (Losses) | ₱ 63,000,000 | ₱ 85,000,000
EUR Assets [Member] | 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 | EUR Assets [Member] | Various dates in two thousand 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 seventeen [Member] | US Dollar Liabilities [Member] | Various Dates In Two Thousand Sixteen And Two Thousand Seventeen | Weighted average [Member] | Foreign Exchange Contracts | Condition Three |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 50.30 |
Termination date various dates in two thousand seventeen [Member] | US Dollar Liabilities [Member] | Various Dates In Two Thousand Sixteen And Two Thousand Seventeen | Weighted average [Member] | Foreign Exchange Contracts | Condition One |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Exchange rate, description | 51.24 |
Termination date various dates in two thousand seventeen [Member] | US Dollar Liabilities [Member] | Various Dates In Two Thousand Sixteen And Two Thousand Seventeen | Weighted average [Member] | Foreign Exchange Contracts | Condition Two |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 51.24 |
Termination date various dates in two thousand eighteen [Member] | US Dollar Liabilities [Member] | Various Dates In Two Thousand Seventeen And Two Thousand Eighteen | Weighted average [Member] | Foreign Exchange Contracts | Condition Six |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 51.58 |
Termination date various dates in two thousand eighteen [Member] | US Dollar Liabilities [Member] | Various Dates In Two Thousand Seventeen And Two Thousand Eighteen | Weighted average [Member] | Foreign Exchange Contracts | Condition Four |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Exchange rate, description | 52.48 |
Termination date various dates in two thousand eighteen [Member] | US Dollar Liabilities [Member] | Various Dates In Two Thousand Seventeen And Two Thousand Eighteen | Weighted average [Member] | Foreign Exchange Contracts | Condition Five |  |
Disclosure of detailed information about financial instruments [Line Items] |  |
Weighted Average Foreign Exchange Rate | 52.48 |

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