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Investment in Debt Securities and Other Long-term Investments - Additional Information (Detail) ₱ in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 30, 2017 PHP (₱) | Dec. 30, 2017 USD ($) | Apr. 30, 2013 PHP (₱) | Dec. 31, 2018 PHP (₱) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 PHP (₱) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 PHP (₱) | Dec. 31, 2016 USD ($) | Oct. 11, 2017 | May 31, 2013 USD ($) | Feb. 28, 2013 PHP (₱) | Oct. 31, 2012 USD ($)
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in debt securities and other long-term investments |  |  |  | ₱ 150,000 |  | ₱ 250,000 |  |  |  |  |  |  |
Seven Year GT Capital Bond [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in debt securities and other long-term investments |  |  |  | 150,000 |  | 150,000 |  |  |  |  |  |  |
4.00% Security Bank Five Year Time Deposit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Gross coupon rate |  |  |  |  |  |  |  |  |  | 4.00% |  |  |
Interest income, net of withholding tax | ₱ 7,000 | $ 146 |  |  |  |  |  | ₱ 8,900 | $ 188 |  |  |  |
Smart Communications, Inc. [Member] | Seven Year GT Capital Bond [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in debt securities and other long-term investments |  |  |  | 150,000 |  | 150,000 |  |  |  |  |  | ₱ 150,000 |
Gross coupon rate |  |  |  |  |  |  |  |  |  |  |  | 4.84% |
Interest income, net of withholding tax |  |  |  | 5,800 |  | 5,800 |  | 5,800 |  |  |  |  |
Smart Communications, Inc. [Member] | PSALM Bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in debt securities and other long-term investments |  |  | ₱ 200,000 |  |  |  |  |  |  |  |  |  |
Gross coupon rate |  |  | 7.75% |  |  |  |  |  |  |  |  |  |
Interest income, net of withholding tax |  |  |  |  |  | 2,300 |  | 7,300 |  |  |  |  |
Percentage yield to maturity |  |  | 4.25% |  |  |  |  |  |  |  |  |  |
PLDT Inc and Smart Communications Inc [Member] | 4.00% Security Bank Five Year Time Deposit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in debt securities and other long-term investments | $ |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,500
PLDT Inc. [Member] | 3.5% Security Bank Five Year Time Deposit [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Investment in debt securities and other long-term investments |  |  |  |  |  | 100 |  |  |  |  | $ 2,000 |  |
Gross coupon rate |  |  |  |  |  |  |  |  |  |  | 3.50% |  |
Interest income, net of withholding tax |  |  |  | ₱ 1,300 | $ 25 | ₱ 3,300 | $ 66 | ₱ 3,100 | $ 66 |  |  |  |

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