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Interest-bearing Financial Liabilities - Additional Information (Detail) $ in Millions |  |  |  | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 23, 2020 USD ($) | Oct. 11, 2019 | Oct. 10, 2019 | Dec. 31, 2020 PHP (₱) | Dec. 31, 2019 PHP (₱) | Jun. 30, 2020 PHP (₱) | May 31, 2020 PHP (₱) | Apr. 30, 2020 PHP (₱) | Mar. 31, 2020 PHP (₱) | Dec. 31, 2018 PHP (₱)
Disclosure Of Detailed Information About Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized Debt Discount |  |  |  | ₱ 1,262,000,000 | ₱ 491,000,000 |  |  |  |  | ₱ 418,000,000
Short-term debt |  |  |  | ₱ 0 |  |  |  |  |  |
Percentage of dollar portion of debt |  |  |  | 18.00% | 9.00% |  |  |  |  |
Total debt to EBITDA ratio |  | 400.00% | 300.00% |  |  |  |  |  |  |
Debt Transaction [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |
Unsecured short term debt |  |  |  |  |  |  |  | ₱ 4,000,000,000 | ₱ 6,000,000,000 |
Unsecured Short Term Debt [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  | 5.75% | 5.00% |
U.S. Dollar Global Notes [Member] | Senior Unsecured Fixed-rate Notes With Coupon of 2.50% [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 2.50% |  |  |  |  |  |  |  |  |
Perpetual notes issued | $ | $ 300 |  |  |  |  |  |  |  |  |
Borrowings, maturity | 10-year |  |  |  |  |  |  |  |  |
U.S. Dollar Global Notes [Member] | Senior Unsecured Fixed-rate Notes With Coupon of 3.45% [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 3.45% |  |  |  |  |  |  |  |  |
Perpetual notes issued | $ | $ 300 |  |  |  |  |  |  |  |  |
Borrowings, maturity | 30-year |  |  |  |  |  |  |  |  |
U.S. Dollar Global Notes [Member] | 2031 Notes [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings, maturity | January 23, 2031 |  |  |  |  |  |  |  |  |
U.S. Dollar Global Notes [Member] | 2050 Notes [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings, maturity | June 23, 2050 |  |  |  |  |  |  |  |  |
5.2250% 7-year fixed rate bonds due 2021 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 5.225% |  |  |  |  |  |  |  |
Borrowings, maturity |  | 7-Year |  |  |  |  |  |  |  |
5.2813 % 10-year fixed rate bonds due 2024 [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 5.2813% |  |  |  |  |  |  |  |
Borrowings, maturity |  | 10-Year |  |  |  |  |  |  |  |
Smart [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |
Prepaid outstanding short-term debt |  |  |  |  |  |  | ₱ 4,000,000,000 |  |  |
PLDT [Member] |  |  |  |  |  |  |  |  |  |
Disclosure Of Detailed Information About Borrowings [Line Items] |  |  |  |  |  |  |  |  |  |
Prepaid outstanding short-term debt |  |  |  |  |  |  | ₱ 3,000,000,000 |  |  |
Prepaid remaining short-term debt |  |  |  |  |  | ₱ 3,000,000,000 |  |  |  |

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