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Debt Instruments at Amortized Cost - Additional Information (Detail) ₱ in Millions, $ in Millions |  | 1 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 09, 2021 PHP (₱) | Jul. 31, 2020 USD ($) | Jun. 30, 2020 USD ($) | Sep. 30, 2019 PHP (₱) | Dec. 31, 2020 PHP (₱) | Dec. 31, 2018 PHP (₱) | Dec. 31, 2019 PHP (₱) | Feb. 28, 2013 PHP (₱)
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Investment in debt securities and other long-term investments |  |  |  |  | ₱ 1,153.0 |  | ₱ 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 |
Retail Treasury Bond [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Gross coupon rate | 2.375% |  |  |  |  |  |  |
Purchased retail treasury bond | 3 years |  |  |  |  |  |  |
Face value of retail treasury bond | ₱ 100.0 |  |  |  |  |  |  |
Maturity on face value of retail treasury bond | Mar. 09, 2024 |  |  |  |  |  |  |
BDO Unibank, Inc. [Member] | 0.90% Two Year Time Deposit [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Investment in debt securities and other long-term investments | $ |  |  | $ 10.0 |  |  |  |  |
Time deposit maturity date |  |  | Jun. 29, 2022 |  |  |  |  |
Gross coupon rate |  |  | 0.90% |  |  |  |  |
Long term fixed rate time deposit interest period |  |  | 30 days |  |  |  |  |
BDO Unibank, Inc. [Member] | 1.00% Two Year Time Deposit [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Investment in debt securities and other long-term investments | $ |  | $ 10.0 |  |  |  |  |  |
Time deposit maturity date |  | Jul. 02, 2022 |  |  |  |  |  |
Gross coupon rate |  | 1.00% |  |  |  |  |  |
Long term fixed rate time deposit interest period |  | 30 days |  |  |  |  |  |
Landbank of Philippines [Member] | 2.00% Two Year Time Deposit [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Investment in debt securities and other long-term investments | $ |  | $ 2.0 |  |  |  |  |  |
Gross coupon rate |  | 2.00% |  |  |  |  |  |
Long term fixed rate time deposit interest period |  | 360 days |  |  |  |  |  |
Landbank of Philippines [Member] | 2.00% Two Year Time Deposit [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Time deposit maturity date |  | Jul. 29, 2022 |  |  |  |  |  |
Landbank of Philippines [Member] | 2.00% Two Year Time Deposit [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |  |  |
Time deposit maturity date |  | Aug. 01, 2022 |  |  |  |  |  |
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
Gross coupon rate |  |  |  |  |  |  |  | 4.84%
Interest income, net of withholding tax |  |  |  | ₱ 5.8 | ₱ 1.0 | ₱ 5.8 |  |

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