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Interest Bearing Financial Liabilities - Summary of Obtained Loans Extended And/Or Guaranteed by Export Credit Agencies (Parenthetical) (Detail) - PHP (₱) ₱ in Millions | Dec. 31, 2018 | May 29, 2017
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Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Prepaid loan amount |  | ₱ 2,000
Export Kreditnamnden [member] | U.S. Dollar Debts [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates on borrowings | 8.35% |
Fixed Rate Retail Bonds [Member] | Loan Agreement Date January Twenty Two Two Thousand Fourteen [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Loans Amount | ₱ 15,000 |
Fixed Rate Retail Bonds [Member] | Philippine Peso Debts [Member] | Loan Agreement Date January Twenty Two Two Thousand Fourteen [Member] | Tranche A [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates on borrowings | 5.225% |
Loans Amount | ₱ 12,400 |
Fixed Rate Retail Bonds [Member] | Philippine Peso Debts [Member] | Loan Agreement Date January Twenty Two Two Thousand Fourteen [Member] | Tranche B [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates on borrowings | 5.2813% |
Loans Amount | ₱ 2,600 |

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