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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, 2020 PHP (₱) | Dec. 31, 2019 PHP (₱) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | ₱ 75,089 | ₱ 63,671 |  |
Long-term Debt | ₱ | 415,474 | 372,490 |  |
Fair Value [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | 8,023 | 13,196 |  |
Long-term Debt | ₱ | 8,385 | 7,964 |  |
Costs [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | 91,914 | 80,873 |  |
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 | 540 | 952 | $ 11 | $ 19
Interest rate risk [member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ 161,597 | ₱ 156,996 | 3,365 | 3,090
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] |  |  |  |
Borrowings, interest rate basis | — | — |  |
Interest rate risk [member] | Debt Instruments at Amortized Cost [Member] | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ 1,153 |  | 24 |
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 |  | 3
Interest rate risk [member] | Cash In Bank | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 2,337 | 1,586 | 49 | 31
Interest rate risk [member] | Cash In Bank | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 4,940 | 4,228 | 103 | 83
Interest rate risk [member] | Cash In Bank | Other Currencies |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  | 92 |  | 2
Interest rate risk [member] | Temporary Cash Investments | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 12,222 | 3,645 | 254 | 72
Interest rate risk [member] | Temporary Cash Investments | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 18,490 | 14,018 | 385 | 276
Interest rate risk [member] | Short Term Investments1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 40,131 | 24,033 | 836 | 474
Interest rate risk [member] | Short Term Investments1 | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 480 |  | 10 |
Interest rate risk [member] | Short Term Investments1 | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 509 | 29 | 11 | 1
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 | ₱ 224,027 | ₱ 193,047 | 4,665 | 3,800
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 |  |  | 258 | 42
Borrowings, interest rate basis | 5.2250 |  |  |
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] |  |  |  |
Borrowings, interest rate basis |  | 4.4850 |  |
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] |  |  |  |
Borrowings, interest rate basis |  | 5.5000 |  |
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 | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  | 49 | 31
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 | 0.50% | 1.00% |  |
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 |  |  | 103 | 83
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 | 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% |  |
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% |  |
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 |  |  | 254 | 72
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 | 0.025% | 0.70% |  |
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 | 0.375% | 4.75% |  |
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 |  |  | 385 | 276
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% | 0.125% |  |
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 | 1.60% | 5.00% |  |
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 |  |  | 812 | 474
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 | ₱ | ₱ 10 |  |  |
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 |  |  | 11 | 1
Interest rate | 2.00% |  |  |
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 | 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] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 258 | 300
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 |  |  | $ 11 | $ 15
Fixed Rate | 2.885% | 2.885% | 2.885% | 2.885%
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 |  |  | $ 313 | $ 376
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] |  |  |  |
Borrowings, interest rate basis | 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] |  |  |  |
Borrowings, interest rate basis | 6.7339 | 6.7339 |  |
Interest rate risk [member] | 1-2 years [Member] | Debt Instruments at Amortized Cost [Member] | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  | 24 |
Interest rate risk [member] | 1-2 years [Member] | Debt Instruments at Amortized Cost [Member] | U.S. Dollars [Member] | Bottom of range [member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 0.90% |  |  |
Interest rate risk [member] | 1-2 years [Member] | Debt Instruments at Amortized Cost [Member] | U.S. Dollars [Member] | Top of range [member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Interest rate | 2.00% |  |  |
Interest rate risk [member] | 1-2 years [Member] | Short Term Investments1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  | 24 |
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 |  |  | 426 | 536
Interest rate risk [member] | 2-3 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] | 2-3 years [Member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 525 | $ 302
Interest rate risk [member] | 2-3 years [Member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Borrowings, interest rate basis | 3.9000 | 3.9000 |  |
Interest rate risk [member] | 2-3 years [Member] | Philippine Peso [Member] | Top of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Borrowings, interest rate basis | 6.7339 | 6.7339 |  |
Interest rate risk [member] | 2-3 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 |  |  | 568 | 335
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 |  |  | 657 | 673
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] |  |  |  |
Borrowings, interest rate basis | 3.9500 | 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] |  |  |  |
Borrowings, interest rate basis | 6.7339 | 6.7339 |  |
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 |  |  | 787 | 793
Interest rate risk [member] | Later than five years [member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 1,612 | 1,697
Interest rate risk [member] | Later than five years [member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Borrowings, interest rate basis | 4.2500 | 4.2500 |  |
Interest rate risk [member] | Later than five years [member] | Philippine Peso [Member] | Top of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Borrowings, interest rate basis | 6.7339 | 6.7339 |  |
Interest rate risk [member] | Later than five 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 |  |  | 2,626 | 1,836
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 | ₱ 20,855 | ₱ 18,975 | 434 | 374
Borrowings, interest rate basis | — | — |  |
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
Borrowings, interest rate basis | — | 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 |  |  | 9 | 69
Borrowings, interest rate basis | 0.5000% to 0.7500% over PHP BVAL (floor rate 4.5000%) | 0.5000% to 1.0000% over PHP BVAL |  |
Interest rate risk [member] | Floating interest rate [member] | 2-3 years [Member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 4 | 3
Borrowings, interest rate basis | 0.5000% to 0.7500% over PHP BVAL (floor rate 4.5000%) | 0.5000% to 0.6000% 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 |  |  | 77 | 70
Borrowings, interest rate basis | 0.5000% to 0.7500% over PHP BVAL (floor rate 4.5000%) | 0.5000% to 0.6000% over PHP BVAL |  |
Interest rate risk [member] | Floating interest rate [member] | Later than five years [member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 344 | 139
Borrowings, interest rate basis | 0.6000% to 0.7500% over PHP BVAL (floor rate 4.5000%) | 0.6000% over PHP BVAL |  |
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 | ₱ 545 | ₱ 945 | 11 | 19
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 | ₱ 167,520 | ₱ 153,644 | 3,489 | 3,024
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] |  |  |  |
Borrowings, interest rate basis | — | — |  |
Interest rate risk [member] | Fair Value [Member] | Debt Instruments at Amortized Cost [Member] | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ 1,163 |  | 24 |
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 |  | 3
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 | 2,337 | 1,586 | 49 | 31
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 | 4,940 | 4,228 | 103 | 83
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 |  | 2
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 | 12,222 | 3,645 | 254 | 72
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 | 18,490 | 14,018 | 385 | 276
Interest rate risk [member] | Fair Value [Member] | Short Term Investments1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 40,141 | 24,033 | 836 | 474
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 | 480 |  | 10 |
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 | 509 | 29 | 11 | 1
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 | 231,478 | 189,687 | 4,821 | 3,734
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 | ₱ 20,855 | ₱ 18,975 | 434 | 374
Borrowings, interest rate basis | — | — |  |
Interest rate risk [member] | U S Dollar Notes | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ 28,813 |  | $ 600 |
Interest rate risk [member] | U S Dollar Notes | Later than five years [member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ | ₱ 600 |  |  |
Interest rate risk [member] | U S Dollar Notes | Later than five years [member] | U.S. Dollars [Member] | Bottom of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Fixed Rate | 2.50% |  | 2.50% |
Interest rate risk [member] | U S Dollar Notes | Later than five years [member] | U.S. Dollars [Member] | Top of range [member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Fixed Rate | 3.45% |  | 3.45% |
Interest rate risk [member] | U S Dollar Notes | Fair Value [Member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ 30,336 |  | $ 632 |
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 | ₱ 12,222 | ₱ 16,124 | 255 | 317
Borrowings, interest rate basis | — | — |  |
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
Borrowings, interest rate basis | — | 0.7900% to 1.4500% 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 |  |  | 93 | 76
Borrowings, interest rate basis | 0.7900% to 1.0500% over LIBOR | 0.7900% to 0.9500% over LIBOR |  |
Interest rate risk [member] | U.S. Dollar Debts [Member] | Floating interest rate [member] | 2-3 years [Member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 39 | 26
Borrowings, interest rate basis | 1.0500% 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 |  |  | 53 | 50
Borrowings, interest rate basis | 1.0500% over LIBOR | 1.0500% over LIBOR |  |
Interest rate risk [member] | U.S. Dollar Debts [Member] | Floating interest rate [member] | Later than five years [member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt |  |  | 70 |
Borrowings, interest rate basis | 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 | ₱ 12,222 | ₱ 16,123 | $ 255 | $ 317
Borrowings, interest rate basis | — | — |  |
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 | ₱ | ₱ 457 | ₱ 408 |  |
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] |  |  |  |
Borrowings, interest rate basis | — | — |  |
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 | ₱ | ₱ 1,262 | ₱ 491 |  |
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 | ₱ | ₱ 101 | ₱ 36 |  |
Borrowings, interest rate basis | — | — |  |
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | U S Dollar Notes | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ | ₱ 634 |  |  |
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 | ₱ | ₱ 69 | ₱ 47 |  |
Borrowings, interest rate basis | — | — |  |
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 | ₱ | ₱ 540 | ₱ 952 |  |
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 | ₱ | ₱ 161,040 | ₱ 156,588 |  |
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] |  |  |  |
Borrowings, interest rate basis | — | — |  |
Interest rate risk [member] | Costs [Member] | Debt Instruments at Amortized Cost [Member] | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | ₱ 1,153 |  |  |
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 |  |
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 | ₱ | 2,337 | 1,586 |  |
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 | ₱ | 4,940 | 4,228 |  |
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 |  |
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 | ₱ | 12,222 | 3,645 |  |
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 | ₱ | 18,490 | 14,018 |  |
Interest rate risk [member] | Costs [Member] | Short Term Investments1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | 40,131 | 24,033 |  |
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 | ₱ | 480 |  |  |
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 | ₱ | 509 | 29 |  |
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 | ₱ | 222,665 | 192,556 |  |
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 | ₱ | ₱ 20,754 | ₱ 18,939 |  |
Borrowings, interest rate basis | — | — |  |
Interest rate risk [member] | Costs [Member] | U S Dollar Notes | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Long-term Debt | ₱ | ₱ 28,179 |  |  |
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 | ₱ | ₱ 12,153 | ₱ 16,077 |  |
Borrowings, interest rate basis | — | — |  |

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