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Debt Instruments at Amortized Cost - Additional Information (Detail) $ in Thousands, ₱ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 PHP (₱) | Dec. 31, 2018 PHP (₱) | Dec. 31, 2018 USD ($) | May 31, 2013 USD ($) | Feb. 28, 2013 PHP (₱)
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |
Investment in debt securities and other long-term investments | ₱ 150.0 | ₱ 150.0 |  |  |
Seven Year GT Capital Bond [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |
Investment in debt securities and other long-term investments | 150.0 | 150.0 |  |  |
3.5% Security Bank Five Year Time Deposit [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |
Gross coupon rate |  |  |  | 3.50% |
Interest income, net of withholding tax |  | 1.3 | $ 25 |  |
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 | 150.0 | 150.0 |  |  | ₱ 150.0
Gross coupon rate |  |  |  |  | 4.84%
Interest income, net of withholding tax | ₱ 5.8 | ₱ 5.8 |  |  |
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 | $ |  |  |  | $ 2,000 |

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