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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, 2021 PHP (₱) | Dec. 31, 2020 PHP (₱) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | ₱ 59,188 | ₱ 75,089 |  |
U.S. Dollar Notes | ₱ | 461,012 | 415,474 |  |
Fair Value [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | 7,591 | 8,023 |  |
U.S. Dollar Notes | ₱ | 8,057 | 8,385 |  |
Costs [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | 73,809 | 91,914 |  |
Interest rate risk [member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
U.S. Dollar Notes | 191 | 540 | $ 4 | $ 11
Interest rate risk [member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
U.S. Dollar Notes | ₱ 132,285 | ₱ 161,597 | 2,595 | 3,365
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 | 0 | 0 |  |
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 | ₱ 207 | ₱ 1,153 | 4 | 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 | 400 |  | 8 |
Interest rate risk [member] | Cash In Bank | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 152 | 2,337 | 3 | 49
Interest rate risk [member] | Cash In Bank | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 5,068 | 4,940 | 99 | 103
Interest rate risk [member] | Temporary Cash Investments | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 2,676 | 12,222 | 53 | 254
Interest rate risk [member] | Temporary Cash Investments | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 10,615 | 18,490 | 208 | 385
Interest rate risk [member] | Short Term Investments1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 21,104 | 40,131 | 414 | 836
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 | 1,986 | 509 | 39 | 11
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] |  |  |  |
U.S. Dollar Notes | ₱ 255,414 | ₱ 224,027 | 5,010 | 4,665
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] |  |  |  |
U.S. Dollar Notes |  |  | $ 4 |
Interest rate | 2.885% |  | 2.885% |
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] |  |  |  |
U.S. Dollar Notes |  |  | $ 120 | 258
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 | 4.5500 |  |  |
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 | 5.4000 |  |  |
Interest rate risk [member] | Less than 1 year [Member] | Debt Instruments at Amortized Cost [Member] | U.S. Dollars [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  | 4 |
Interest rate | 2.00% |  |  |
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 |  |  | 3 | 49
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 | 0.05% | 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% | 0.50% |  |
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 |  |  | 99 | 103
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 | 1.00% | 2.50% |  |
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 |  |  | 53 | 254
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 | 0.05% | 0.02% |  |
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 | 0.20% | 2.50% |  |
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 |  |  | 208 | 385
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 | 0.20% | 0.32% |  |
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 | 1.99% | 1.60% |  |
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 |  |  | 406 | 812
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 |  |  | 39 | 11
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 | 0.50% |  |  |
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 | 1.99% |  |  |
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] |  |  |  |
U.S. Dollar Notes |  |  | 150 | 258
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] |  |  |  |
U.S. Dollar Notes |  |  |  | $ 11
Interest rate |  | 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] |  |  |  |
U.S. Dollar Notes |  |  | 519 | $ 313
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 | 6.3457 | 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 |  | 0.8962% |  |
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] |  |  |  |
U.S. Dollar Notes |  |  | 631 | 426
Interest rate risk [member] | 2024 | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
U.S. Dollar Notes |  |  | 185 | 525
Interest rate risk [member] | 2024 | 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 | 4.0000 | 3.9000 |  |
Interest rate risk [member] | 2024 | 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 | 6.3457 | 6.7339 |  |
Interest rate risk [member] | 2024 | Debt Instruments at Amortized Cost [Member] | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  | 2 |
Interest rate | 2.375% |  |  |
Interest rate risk [member] | 2024 | Short Term Investments1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  | 2 |
Interest rate risk [member] | 2024 | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
U.S. Dollar Notes |  |  | 319 | 568
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] |  |  |  |
U.S. Dollar Notes |  |  | 649 | 657
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 | 4.0000 | 3.9500 |  |
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 | 6.3457 | 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] |  |  |  |
U.S. Dollar Notes |  |  | 736 | 787
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] |  |  |  |
U.S. Dollar Notes |  |  | 1,122 | 1,612
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 | 4.2588 | 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 | 6.3457 | 6.7339 |  |
Interest rate risk [member] | Later than five years [member] | Debt Instruments at Amortized Cost [Member] | Philippine Peso [Member] |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  | 6 |
Interest rate | 4.625% |  |  |
Interest rate risk [member] | Later than five years [member] | Short Term Investments1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets |  |  | 6 |
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] |  |  |  |
U.S. Dollar Notes |  |  | 3,174 | 2,626
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] |  |  |  |
U.S. Dollar Notes | ₱ 82,025 | ₱ 20,855 | 1,609 | 434
Borrowings, interest rate basis | 0 | 0 |  |
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] |  |  |  |
Borrowings, interest rate basis | 0 | 0 |  |
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] |  |  |  |
U.S. Dollar Notes |  |  | 59 | 9
Borrowings, interest rate basis | 0.5000% to 0.9000% over PHP BVAL/ 0.2500% over TDF (floor rate 3.9000% to 4.5000%) | 0.5000% to 0.7500% over PHP BVAL (floor rate 4.5000%) |  |
Interest rate risk [member] | Floating Interest Rate [Member] | 2024 | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
U.S. Dollar Notes |  |  | 95 | 4
Borrowings, interest rate basis | 0.5000% to 0.9000% over PHP BVAL/ 0.2500% over TDF (floor rate 3.9000% to 4.5000%) | 0.5000% to 0.7500% over PHP BVAL (floor rate 4.5000%) |  |
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] |  |  |  |
U.S. Dollar Notes |  |  | 59 | 77
Borrowings, interest rate basis | 0.6000% to 0.9000% over PHP BVAL/ 0.2500% over TDF (floor rate 3.9000% to 4.5000%) | 0.5000% to 0.7500% over PHP BVAL (floor rate 4.5000%) |  |
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] |  |  |  |
U.S. Dollar Notes |  |  | 1,396 | 344
Borrowings, interest rate basis | 0.6000% to 0.9000% over PHP BVAL/ 0.2500% over TDF (floor rate 3.9000% to 4.5000%) | 0.6000% to 0.7500% over PHP BVAL (floor rate 4.5000%) |  |
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] |  |  |  |
U.S. Dollar Notes | ₱ 193 | ₱ 545 | 4 | 11
Interest rate risk [member] | Fair Value [Member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
U.S. Dollar Notes | ₱ 131,039 | ₱ 167,520 | 2,571 | 3,489
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 | 0 | 0 |  |
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 | ₱ 207 | ₱ 1,163 | 4 | 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 | 403 |  | 8 |
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 | 152 | 2,337 | 3 | 49
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 | 5,068 | 4,940 | 99 | 103
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 | 2,676 | 12,222 | 53 | 254
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 | 10,615 | 18,490 | 208 | 385
Interest rate risk [member] | Fair Value [Member] | Short Term Investments1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | 21,107 | 40,141 | 414 | 836
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 | 1,986 | 509 | 39 | 11
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] |  |  |  |
U.S. Dollar Notes | 254,027 | 231,478 | 4,983 | 4,821
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] |  |  |  |
U.S. Dollar Notes | ₱ 82,025 | ₱ 20,855 | 1,609 | 434
Borrowings, interest rate basis | 0 | 0 |  |
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] |  |  |  |
U.S. Dollar Notes | ₱ 30,584 | ₱ 28,813 | 600 | 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] |  |  |  |
U.S. Dollar Notes |  |  | $ 600 | $ 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] |  |  |  |
Interest rate | 2.50% | 2.50% | 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] |  |  |  |
Interest rate | 3.45% | 3.45% | 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] |  |  |  |
U.S. Dollar Notes | ₱ 30,441 | ₱ 30,336 | $ 597 | $ 632
Interest rate risk [member] | U S Dollar Debts | Floating Interest Rate [Member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
U.S. Dollar Notes | ₱ 10,329 | ₱ 12,222 | 202 | 255
Borrowings, interest rate basis | 0 | 0 |  |
Interest rate risk [member] | U S Dollar Debts | 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] |  |  |  |
U.S. Dollar Notes |  |  | 26 |
Borrowings, interest rate basis | 0.7900% to 0.9500% over LIBOR | 0 |  |
Interest rate risk [member] | U S Dollar Debts | 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] |  |  |  |
U.S. Dollar Notes |  |  | 53 | 93
Borrowings, interest rate basis | 1.0500% over LIBOR | 0.7900% to 1.0500% over LIBOR |  |
Interest rate risk [member] | U S Dollar Debts | Floating Interest Rate [Member] | 2024 | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
U.S. Dollar Notes |  |  | 39 | 39
Borrowings, interest rate basis | 1.0500% over LIBOR | 1.0500% over LIBOR |  |
Interest rate risk [member] | U S Dollar Debts | 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] |  |  |  |
U.S. Dollar Notes |  |  | 28 | 53
Borrowings, interest rate basis | 1.0500% over LIBOR | 1.0500% over LIBOR |  |
Interest rate risk [member] | U S Dollar Debts | 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] |  |  |  |
U.S. Dollar Notes |  |  | 56 | 70
Borrowings, interest rate basis | 1.0500% over LIBOR | 1.0500% over LIBOR |  |
Interest rate risk [member] | U S Dollar Debts | 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] |  |  |  |
U.S. Dollar Notes | ₱ 10,329 | ₱ 12,222 | $ 202 | $ 255
Borrowings, interest rate basis | 0 | 0 |  |
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] |  |  |  |
U.S. Dollar Notes | ₱ | ₱ 1,056 | ₱ 532 |  |
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 | 0 | 0 |  |
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] |  |  |  |
U.S. Dollar Notes | ₱ | ₱ 2,857 | ₱ 1,262 |  |
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] |  |  |  |
U.S. Dollar Notes | ₱ | ₱ 1,136 | ₱ 27 |  |
Borrowings, interest rate basis | 0 | 0 |  |
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] |  |  |  |
U.S. Dollar Notes | ₱ | ₱ 613 | ₱ 634 |  |
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | U S Dollar Debts | Floating Interest Rate [Member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
U.S. Dollar Notes | ₱ | ₱ 52 | ₱ 69 |  |
Borrowings, interest rate basis | 0 | 0 |  |
Interest rate risk [member] | Costs [Member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
U.S. Dollar Notes | ₱ | ₱ 191 | ₱ 540 |  |
Interest rate risk [member] | Costs [Member] | Philippine Peso [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
U.S. Dollar Notes | ₱ | ₱ 131,229 | ₱ 161,065 |  |
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 | 0 | 0 |  |
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 | ₱ | ₱ 207 | ₱ 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 | ₱ | 400 |  |  |
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 | ₱ | 152 | 2,337 |  |
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 | ₱ | 5,068 | 4,940 |  |
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 | ₱ | 2,676 | 12,222 |  |
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 | ₱ | 10,615 | 18,490 |  |
Interest rate risk [member] | Costs [Member] | Short Term Investments1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
Total assets | ₱ | 21,104 | 40,131 |  |
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 | ₱ | 1,986 | 509 |  |
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] |  |  |  |
U.S. Dollar Notes | ₱ | 252,557 | 222,765 |  |
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] |  |  |  |
U.S. Dollar Notes | ₱ | ₱ 80,889 | ₱ 20,828 |  |
Borrowings, interest rate basis | 0 | 0 |  |
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] |  |  |  |
U.S. Dollar Notes | ₱ | ₱ 29,971 | ₱ 28,179 |  |
Interest rate risk [member] | Costs [Member] | U S Dollar Debts | Floating Interest Rate [Member] | U.S. Dollars [Member] | Long Term Debt1 |  |  |  |
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items] |  |  |  |
U.S. Dollar Notes | ₱ | ₱ 10,277 | ₱ 12,153 |  |
Borrowings, interest rate basis | 0 | 0 |  |

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