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Income Taxes - Additional Information (Detail) - PHP (₱) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure Of Other Income Expense [Line Items] |  |  |
Excess MCIT deducted against RCIT | ₱ 2,000,000 | ₱ 1,426,000,000 | ₱ 206,000,000
Unrecognized deferred income tax assets | 901,000,000 | 1,940,000,000 |
Total excess MCIT | 23,000,000 |  |
Expired portion of excess MCIT | 0 | 1,000,000 | 10,000,000
Total NOLCO claimed as deduction against future taxable income | 370,000,000 |  |
Deduction against taxable income | 556,000,000 | 2,109,000,000 | 9,530,000,000
Expired portion of excess NOLCO | 990,000,000 | 1,170,000,000 | ₱ 973,000,000
Expiration amount of NOLCO incurred after five years | ₱ 189,000,000 | 183,000,000 |
Extended period of carry over period for net operating loss carry over | 5 years |  |
Previous extended period of carry over period for net operating loss carry over | 3 years |  |
December Thirty One Two Thousand And Twenty One Net |  |  |
Disclosure Of Other Income Expense [Line Items] |  |  |
Total excess MCIT | ₱ 23,000,000 |  |
Total NOLCO claimed as deduction against future taxable income | 365,000,000 |  |
DMPI and ePLDT [Member] |  |  |
Disclosure Of Other Income Expense [Line Items] |  |  |
Unrecognized deferred income tax assets | 201,000,000 | ₱ 209,000,000 |
VIH [Member] |  |  |
Disclosure Of Other Income Expense [Line Items] |  |  |
Unrecognized deferred income tax liability | ₱ 58,000,000 |  |
Subic Tel and Clark Tel [Member] |  |  |
Disclosure Of Other Income Expense [Line Items] |  |  |
Special income tax rate as percentage of gross sales | 5.00% |  |

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