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v3.19.1

Interest-bearing Financial Liabilities - Summary of Long-term Debt (Parenthetical) (Detail) | Dec. 31, 2018 | Dec. 31, 2017
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Export Credit Agencies-Supported Loans [Member] | Export Kreditnamnden [member] | U.S. Dollars [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates on borrowings | 1.41% |
Export Credit Agencies-Supported Loans [Member] | Export Kreditnamnden [member] | London Interbank Offered Rate [Member] | U.S. Dollars [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates at LIBOR |  | 0.30%
Export Credit Agencies-Supported Loans [Member] | Export Kreditnamnden [member] | U.S. Dollars [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates on borrowings |  | 8.35%
Export Credit Agencies-Supported Loans [Member] | Bottom Of Range [Member] | Export Kreditnamnden [member] | U.S. Dollars [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates on borrowings |  | 1.41%
Export Credit Agencies-Supported Loans [Member] | Top of range [member] | Export Kreditnamnden [member] | U.S. Dollars [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates on borrowings |  | 1.90%
Term Loans | GSM Network Expansion Facilities [Member] | London Interbank Offered Rate [Member] | U.S. Dollars [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates at LIBOR |  | 1.1125%
Term Loans | Others [Member] | U.S. Dollars [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates on borrowings | 2.885% | 2.885%
Term Loans | Unsecured Term Loans [Member] | Bangko Sentral ng Pilipinas Overnight Rate [Member] | Philippine Peso [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Overnight rates on borrowing |  | 1.00%
Term Loans | Bottom Of Range [Member] | Others [Member] | London Interbank Offered Rate [Member] | U.S. Dollars [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates at LIBOR | 0.79% | 0.79%
Term Loans | Bottom Of Range [Member] | Unsecured Term Loans [Member] | Philippine Peso [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates on borrowings | 3.90% |
Term Loans | Bottom Of Range [Member] | Unsecured Term Loans [Member] | Over PDSTR Two [Member] | Philippine Peso [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates on borrowings | 0.50% | 3.90%
Term Loans | Top of range [member] | Others [Member] | London Interbank Offered Rate [Member] | U.S. Dollars [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates at LIBOR | 1.60% | 1.60%
Term Loans | Top of range [member] | Unsecured Term Loans [Member] | Philippine Peso [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates on borrowings | 6.7339% |
Term Loans | Top of range [member] | Unsecured Term Loans [Member] | Over PDSTR Two [Member] | Philippine Peso [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates on borrowings | 1.00% | 6.4044%
Philippine Peso Debts [Member] | Bottom Of Range [Member] | Fixed ​Rate​ Corporate​ Notes [​Member] | Philippine Peso [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates on borrowings | 5.3938% | 5.33%
Philippine Peso Debts [Member] | Bottom Of Range [Member] | Fixed Rate Retail Bonds [Member] | Philippine Peso [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates on borrowings | 5.225% | 5.225%
Philippine Peso Debts [Member] | Top of range [member] | Fixed ​Rate​ Corporate​ Notes [​Member] | Philippine Peso [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates on borrowings | 5.9058% | 6.26%
Philippine Peso Debts [Member] | Top of range [member] | Fixed Rate Retail Bonds [Member] | Philippine Peso [Member] |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |
Interest rates on borrowings | 5.2813% | 5.2813%

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