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Financial Assets and Liabilities - Summary of Carrying Amounts, by Maturity, of Financial Instruments that are Expected to Have Exposure on Interest Rate Risk (Detail) ₱ in Millions, $ in Millions | 12 Months Ended |  |
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Dec. 31, 2019 PHP (₱) | Dec. 31, 2018 PHP (₱) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | ₱ 63,671 | ₱ 95,747 |  |
Long-term Debt | ₱ | 372,490 | 332,771 |  |
Fair Value [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | 13,196 | 16,272 |  |
Long-term Debt | ₱ | 7,964 | 7,942 |  |
Costs [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | 80,873 | 112,486 |  |
Interest rate risk [member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ 156,996 | ₱ 138,637 | $ 3,090 | $ 2,638
Interest rate risk [member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | — | — |  |
Interest rate risk [member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ 952 | ₱ 1,483 | 19 | 28
Interest rate risk [member] | Debt Instruments at Amortized Cost [Member] | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 150 | 150 | 3 | 3
Interest rate risk [member] | Cash In Bank | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 4,228 | 3,017 | 83 | 57
Interest rate risk [member] | Cash In Bank | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 1,586 | 1,580 | 31 | 30
Interest rate risk [member] | Cash In Bank | Other Currencies |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 92 | 4 | 2 |
Interest rate risk [member] | Temporary Cash Investments | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 14,018 | 10,204 | 276 | 194
Interest rate risk [member] | Temporary Cash Investments | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 3,645 | 35,467 | 72 | 675
Interest rate risk [member] | Short Term Investments1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 24,033 | 51,587 | 474 | 982
Interest rate risk [member] | Short Term Investments1 | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 29 | 27 | 1 | 1
Interest rate risk [member] | Short Term Investments1 | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  | 1,138 |  | 22
Interest rate risk [member] | Short Term Investments1 | Other Currencies |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 285 |  | 6 |
Interest rate risk [member] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ 193,047 | ₱ 176,694 | 3,800 | 3,362
Interest rate risk [member] | Less than 1 year [Member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 42 | 234
Interest rate risk [member] | Less than 1 year [Member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 4.4850 | 4.9110 |  |
Interest rate risk [member] | Less than 1 year [Member] | Philippine Peso [Member] | Top of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 5.5000 | 5.6038 |  |
Interest rate risk [member] | Less than 1 year [Member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  |  | $ 2
Fixed Rate |  | 1.41% |  | 1.41%
Interest rate risk [member] | Less than 1 year [Member] | Debt Instruments at Amortized Cost [Member] | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  | 3 |
Interest rate | 4.8371% |  |  |
Interest rate risk [member] | Less than 1 year [Member] | Cash In Bank | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  | 83 | $ 57
Interest rate risk [member] | Less than 1 year [Member] | Cash In Bank | Philippine Peso [Member] | Bottom of range [member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 0.05% | 0.05% |  |
Interest rate risk [member] | Less than 1 year [Member] | Cash In Bank | Philippine Peso [Member] | Top of range [member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 1.25% | 1.25% |  |
Interest rate risk [member] | Less than 1 year [Member] | Cash In Bank | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  | 31 | 30
Interest rate risk [member] | Less than 1 year [Member] | Cash In Bank | U.S. Dollars [Member] | Bottom of range [member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 0.01% | 0.01% |  |
Interest rate risk [member] | Less than 1 year [Member] | Cash In Bank | U.S. Dollars [Member] | Top of range [member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 1.00% | 0.25% |  |
Interest rate risk [member] | Less than 1 year [Member] | Cash In Bank | Other Currencies |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  | 2 |
Interest rate risk [member] | Less than 1 year [Member] | Cash In Bank | Other Currencies | Bottom of range [member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 0.10% | 0.10% |  |
Interest rate risk [member] | Less than 1 year [Member] | Cash In Bank | Other Currencies | Top of range [member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 0.50% | 0.50% |  |
Interest rate risk [member] | Less than 1 year [Member] | Temporary Cash Investments | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  | 276 | 194
Interest rate risk [member] | Less than 1 year [Member] | Temporary Cash Investments | Philippine Peso [Member] | Bottom of range [member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 0.125% | 0.25% |  |
Interest rate risk [member] | Less than 1 year [Member] | Temporary Cash Investments | Philippine Peso [Member] | Top of range [member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 5.00% | 7.05% |  |
Interest rate risk [member] | Less than 1 year [Member] | Temporary Cash Investments | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  | 72 | 675
Interest rate risk [member] | Less than 1 year [Member] | Temporary Cash Investments | U.S. Dollars [Member] | Bottom of range [member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 0.70% | 2.70% |  |
Interest rate risk [member] | Less than 1 year [Member] | Temporary Cash Investments | U.S. Dollars [Member] | Top of range [member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 4.75% | 3.00% |  |
Interest rate risk [member] | Less than 1 year [Member] | Short Term Investments1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  | 474 | 979
Interest rate risk [member] | Less than 1 year [Member] | Short Term Investments1 | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  | 1 | 1
Interest rate |  | 3.50% |  |
Interest rate risk [member] | Less than 1 year [Member] | Short Term Investments1 | Philippine Peso [Member] | Bottom of range [member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 1.50% |  |  |
Interest rate risk [member] | Less than 1 year [Member] | Short Term Investments1 | Philippine Peso [Member] | Top of range [member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 3.00% |  |  |
Interest rate risk [member] | Less than 1 year [Member] | Short Term Investments1 | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  |  | 22
Interest rate risk [member] | Less than 1 year [Member] | Short Term Investments1 | Other Currencies |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  | 6 |
Interest rate | 0.00% |  |  |
Interest rate risk [member] | Less than 1 year [Member] | Short Term Investments1 | Other Currencies | Bottom of range [member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate |  | 2.50% |  |
Interest rate risk [member] | Less than 1 year [Member] | Short Term Investments1 | Other Currencies | Top of range [member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate |  | 3.00% |  |
Interest rate risk [member] | Less than 1 year [Member] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 300 | 253
Interest rate risk [member] | 1-2 years [Member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 376 | 123
Interest rate risk [member] | 1-2 years [Member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 3.9000 | 3.9000 |  |
Interest rate risk [member] | 1-2 years [Member] | Philippine Peso [Member] | Top of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 6.7339 | 6.7339 |  |
Interest rate risk [member] | 1-2 years [Member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | $ 15 | $ 15
Fixed Rate | 2.885% | 2.885% | 2.885% | 2.885%
Interest rate risk [member] | 1-2 years [Member] | Debt Instruments at Amortized Cost [Member] | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  |  | $ 3
Interest rate |  | 4.8371% |  |
Interest rate risk [member] | 1-2 years [Member] | Short Term Investments1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  |  | 3
Interest rate risk [member] | 1-2 years [Member] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | $ 536 | 518
Interest rate risk [member] | 2022 [Member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 302 | 319
Interest rate risk [member] | 2022 [Member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 3.9000 | 3.9000 |  |
Interest rate risk [member] | 2022 [Member] | Philippine Peso [Member] | Top of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 6.7339 | 6.7339 |  |
Interest rate risk [member] | 2022 [Member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | $ 4 | $ 7
Fixed Rate | 2.885% | 2.885% | 2.885% | 2.885%
Interest rate risk [member] | 2022 [Member] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | $ 335 | $ 428
Interest rate risk [member] | 3-5 years [Member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 673 | 730
Interest rate risk [member] | 3-5 years [Member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 3.9000 | 3.9000 |  |
Interest rate risk [member] | 3-5 years [Member] | Philippine Peso [Member] | Top of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 6.7339 | 6.7339 |  |
Interest rate risk [member] | 3-5 years [Member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  |  | $ 4
Fixed Rate |  | 2.885% |  | 2.885%
Interest rate risk [member] | 3-5 years [Member] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 793 | $ 788
Interest rate risk [member] | More than 5 years [Member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 1,697 | 1,232
Interest rate risk [member] | More than 5 years [Member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 4.2500 | 4.2500 |  |
Interest rate risk [member] | More than 5 years [Member] | Philippine Peso [Member] | Top of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 6.7339 | 6.7339 |  |
Interest rate risk [member] | More than 5 years [Member] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 1,836 | 1,375
Interest rate risk [member] | Floating interest rate [member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ 18,975 | ₱ 14,610 | 374 | 278
Interest rate | — | — |  |
Interest rate risk [member] | Floating interest rate [member] | Less than 1 year [Member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 93 |
Interest rate | 1.0000% over PHP BVAL | — |  |
Interest rate risk [member] | Floating interest rate [member] | 1-2 years [Member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 69 | 94
Interest rate | 0.5000% to 1.0000% over PHP BVAL | 0.5000% to 1.0000% over PHP BVAL |  |
Interest rate risk [member] | Floating interest rate [member] | 2022 [Member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 3 | 64
Interest rate | 0.5000% to 0.6000% over PHP BVAL | 0.5000% to 1.0000% over PHP BVAL |  |
Interest rate risk [member] | Floating interest rate [member] | 3-5 years [Member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 70 | 2
Interest rate | 0.5000% to 0.6000% over PHP BVAL | 0.5000% to 0.6000% over PHP BVAL |  |
Interest rate risk [member] | Floating interest rate [member] | More than 5 years [Member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 139 | 118
Interest rate | 0.6000% over PHP BVAL | 0.5000% to 0.6000% over PHP BVAL |  |
Interest rate risk [member] | Fair Value [Member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ 153,644 | ₱ 121,868 | 3,024 | 2,319
Interest rate risk [member] | Fair Value [Member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | — | — |  |
Interest rate risk [member] | Fair Value [Member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ 945 | ₱ 1,502 | 19 | 28
Interest rate risk [member] | Fair Value [Member] | Debt Instruments at Amortized Cost [Member] | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 150 | 148 | 3 | 3
Interest rate risk [member] | Fair Value [Member] | Cash In Bank | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 4,228 | 3,017 | 83 | 57
Interest rate risk [member] | Fair Value [Member] | Cash In Bank | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 1,586 | 1,580 | 31 | 30
Interest rate risk [member] | Fair Value [Member] | Cash In Bank | Other Currencies |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 92 | 4 | 2 |
Interest rate risk [member] | Fair Value [Member] | Temporary Cash Investments | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 14,018 | 10,204 | 276 | 194
Interest rate risk [member] | Fair Value [Member] | Temporary Cash Investments | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 3,645 | 35,467 | 72 | 675
Interest rate risk [member] | Fair Value [Member] | Short Term Investments1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 24,033 | 51,585 | 474 | 982
Interest rate risk [member] | Fair Value [Member] | Short Term Investments1 | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 29 | 27 | 1 | 1
Interest rate risk [member] | Fair Value [Member] | Short Term Investments1 | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  | 1,138 |  | 22
Interest rate risk [member] | Fair Value [Member] | Short Term Investments1 | Other Currencies |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 285 |  | 6 |
Interest rate risk [member] | Fair Value [Member] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | 189,687 | 159,945 | 3,734 | 3,043
Interest rate risk [member] | Fair Value [Member] | Floating interest rate [member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ 18,975 | ₱ 14,610 | 374 | 278
Interest rate | — | — |  |
Interest rate risk [member] | U.S. Dollar Debts [Member] | Floating interest rate [member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ 16,124 | ₱ 21,964 | 317 | 418
Interest rate | — | — |  |
Interest rate risk [member] | U.S. Dollar Debts [Member] | Floating interest rate [member] | Less than 1 year [Member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 165 | 17
Interest rate | 0.7900% to 1.4500% over LIBOR | 0.9500% to 1.1000% over LIBOR |  |
Interest rate risk [member] | U.S. Dollar Debts [Member] | Floating interest rate [member] | 1-2 years [Member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 76 | 286
Interest rate | 0.7900% to 0.9500% over LIBOR | 0.7900% to 1.4500% over LIBOR |  |
Interest rate risk [member] | U.S. Dollar Debts [Member] | Floating interest rate [member] | 2022 [Member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 26 | 38
Interest rate | 0.7900% to 0.9500% over LIBOR | 0.7900% to 0.9500% over LIBOR |  |
Interest rate risk [member] | U.S. Dollar Debts [Member] | Floating interest rate [member] | 3-5 years [Member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 50 | 52
Interest rate | 1.0500% over LIBOR | 0.7900% to 1.0500% over LIBOR |  |
Interest rate risk [member] | U.S. Dollar Debts [Member] | Floating interest rate [member] | More than 5 years [Member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  |  | 25
Interest rate | — | 1.0500% over LIBOR |  |
Interest rate risk [member] | U.S. Dollar Debts [Member] | Fair Value [Member] | Floating interest rate [member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ 16,123 | ₱ 21,965 | $ 317 | $ 418
Interest rate | — | — |  |
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ | ₱ 408 | ₱ 278 |  |
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | — | — |  |
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ |  | ₱ 1 |  |
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ | ₱ 491 | 418 |  |
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | Floating interest rate [member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ | ₱ 36 | ₱ 45 |  |
Interest rate | — | — |  |
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | U.S. Dollar Debts [Member] | Floating interest rate [member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ | ₱ 47 | ₱ 94 |  |
Interest rate | — | — |  |
Interest rate risk [member] | Costs [Member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ | ₱ 156,588 | ₱ 138,359 |  |
Interest rate risk [member] | Costs [Member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | — | — |  |
Interest rate risk [member] | Costs [Member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ | ₱ 952 | ₱ 1,482 |  |
Interest rate risk [member] | Costs [Member] | Debt Instruments at Amortized Cost [Member] | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | 150 | 150 |  |
Interest rate risk [member] | Costs [Member] | Cash In Bank | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | 4,228 | 3,017 |  |
Interest rate risk [member] | Costs [Member] | Cash In Bank | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | 1,586 | 1,580 |  |
Interest rate risk [member] | Costs [Member] | Cash In Bank | Other Currencies |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | 92 | 4 |  |
Interest rate risk [member] | Costs [Member] | Temporary Cash Investments | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | 14,018 | 10,204 |  |
Interest rate risk [member] | Costs [Member] | Temporary Cash Investments | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | 3,645 | 35,467 |  |
Interest rate risk [member] | Costs [Member] | Short Term Investments1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | 24,033 | 51,587 |  |
Interest rate risk [member] | Costs [Member] | Short Term Investments1 | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | 29 | 27 |  |
Interest rate risk [member] | Costs [Member] | Short Term Investments1 | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ |  | 1,138 |  |
Interest rate risk [member] | Costs [Member] | Short Term Investments1 | Other Currencies |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | 285 |  |  |
Interest rate risk [member] | Costs [Member] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ | 192,556 | 176,276 |  |
Interest rate risk [member] | Costs [Member] | Floating interest rate [member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ | ₱ 18,939 | ₱ 14,565 |  |
Interest rate | — | — |  |
Interest rate risk [member] | Costs [Member] | U.S. Dollar Debts [Member] | Floating interest rate [member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ | ₱ 16,077 | ₱ 21,870 |  |
Interest rate | — | — |  |

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