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Summary of Significant Accounting Policies - Additional Information (Detail) |  |  |  |  |  |  |  |  |  | 12 Months Ended |  |  |  |  |  |
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Mar. 01, 2021 | Apr. 30, 2020 PHP (₱) Payment | Nov. 07, 2019 PHP (₱) | Aug. 07, 2018 PHP (₱) | Mar. 05, 2018 PHP (₱) | Jun. 13, 2017 PHP (₱) | May 30, 2016 PHP (₱) | Jun. 30, 2012 PHP (₱) | Mar. 24, 2000 | Dec. 31, 2020 PHP (₱) | Dec. 31, 2018 | Dec. 31, 2011 PHP (₱) | Apr. 27, 2020 PHP (₱) | Jan. 23, 2020 PHP (₱) | Dec. 31, 2019 PHP (₱) | Sep. 13, 2019 PHP (₱) | Aug. 15, 2019 PHP (₱) | Oct. 26, 2011
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid (received) |  |  |  |  |  | ₱ 21,800,000,000 | ₱ 26,200,000,000 |  |  |  |  |  |  |  |  |  |  |
Total consideration transferred |  |  |  |  |  |  | ₱ 52,800,000,000 |  |  |  |  |  |  |  |  |  |  |
Total expenses related to Covid-19 measures |  |  |  |  |  |  |  |  |  | ₱ 903,000,000 |  |  |  |  |  |  |  |
Rent concessions as effect of Covid-19 pandemic |  |  |  |  |  |  |  |  |  | 137,000,000 |  |  |  |  |  |  |  |
ECL recognized on investment |  |  |  |  |  |  |  |  |  | ₱ 0 |  |  |  |  |  |  |  |
Description of debt investment security credit risk |  |  |  |  |  |  |  |  |  | debt instruments to have low credit risk when its credit risk rating is equivalent to the globally understood definition of ‘investment grade’, or when the exposure is less than 30 days past due. |  |  |  |  |  |  |  |
Transaction price allocated to remaining performance obligations |  |  |  |  |  |  |  |  |  | ₱ 22,921,000,000 |  |  |  |  | ₱ 22,864,000,000 |  |  |
Equivalency of each Giga Point |  |  |  |  |  |  |  |  |  | ₱ 1.00 |  |  |  |  |  |  |  |
Less than 1 year [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining performance obligations percentage |  |  |  |  |  |  |  |  |  | 72.00% |  |  |  |  | 68.00% |  |  |
1-2 years [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining performance obligations percentage |  |  |  |  |  |  |  |  |  | 28.00% |  |  |  |  | 32.00% |  |  |
Events after Reporting Period [Member] | PHW Subscribers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notice period to subscribers | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial purchase price |  |  |  |  |  |  |  |  |  | ₱ 1,455,000,000 |  |  |  |  |  |  |  |
Sun Trademark [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization |  |  |  |  |  |  |  |  |  | 1,877,000,000 |  |  |  |  |  |  |  |
Digital Telecommunications Phils., Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquisition |  |  |  |  |  |  |  |  |  |  |  | ₱ 4,505,000,000 |  |  |  |  |  |
PLDT Home, Smart Consumer Postpaid, and Sun Consumer Postpaid Subscribers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equal monthly payments | Payment |  | 6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest |  | 0.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Penalties |  | ₱ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Digital Telecommunications Phils., Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest in subsidiary acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.60%
Smart Communications, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Amount paid to minority shareholders |  |  |  |  |  |  |  |  |  | 6,825,000,000 |  |  |  |  |  |  |  |
Smart Communications, Inc. [Member] | Red Mobile [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid (received) |  |  |  |  |  |  |  | ₱ 18,000,000 |  |  |  |  |  |  |  |  |  |
Connectivity Unlimited Resource Enterprise | Ph Communications Holdings Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership |  |  |  |  |  |  |  |  |  |  | 97.00% |  |  |  |  |  |  |
Connectivity Unlimited Resource Enterprise | Francom Holdings Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership |  |  |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |  |
Primeworld Digital Systems, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interest in subsidiary acquired |  |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration paid (received) |  |  | ₱ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership |  |  | 100.00% | 95.00% | 67.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Additional Investments |  |  |  | ₱ 66,000,000 | ₱ 134,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
PLDT Communications and Energy Ventures, Inc. [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount paid to minority shareholders |  |  |  |  |  |  |  |  |  | ₱ 4,000,000 |  |  |  |  |  |  |  |
Philcom [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration transferred |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 319,000,000 | ₱ 1,760,000,000 |
SubicTel [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration transferred |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 622,000,000 |  |  |  |
Maratel Subscribers [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration transferred |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 500,000,000 |  |  |  |  |

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