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Interest-bearing Financial Liabilities - Summary of Scheduled Maturities of Consolidated Outstanding Long-term Debt at Nominal Values (Detail) - Dec. 31, 2018 ₱ in Millions, $ in Millions | PHP (₱) | USD ($)
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Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | ₱ 176,694 |
U.S. Dollars [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 23,447 | $ 446
Philippine Peso [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 153,247 |
2019 [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 20,555 |
2019 [Member] | U.S. Dollars [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 5,779 | 110
2019 [Member] | Philippine Peso [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 14,776 |
1-2 years [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 20,000 |
1-2 years [Member] | U.S. Dollars [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 11,057 | 210
1-2 years [Member] | Philippine Peso [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 8,943 |
2021 [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 22,484 |
2021 [Member] | U.S. Dollars [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 2,386 | 46
2021 [Member] | Philippine Peso [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 20,098 |
2022 [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 15,989 |
2022 [Member] | U.S. Dollars [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 1,597 | 30
2022 [Member] | Philippine Peso [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 14,392 |
2023 [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 25,412 |
2023 [Member] | U.S. Dollars [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 1,314 | 25
2023 [Member] | Philippine Peso [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 24,098 |
2024 and onwards [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 72,254 |
2024 and onwards [Member] | U.S. Dollars [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | 1,314 | $ 25
2024 and onwards [Member] | Philippine Peso [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Outstanding long-term debt at nominal values | ₱ 70,940 |

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