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Income Taxes - Additional Information (Detail) - PHP (₱) ₱ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Other Income Expense [Line Items] |  |  |
Consolidated unrecognized deferred income tax assets | ₱ 2,294 | ₱ 3,227 |
MCIT | 1,435 |  |
Excess MCIT deducted against RCIT | 206 | 488 | ₱ 15
Expired portion of excess MCIT | 10 | 1 | 72
NOLCO | 4,762 |  |
Deduction against taxable income | 9,530 | 1,094 | 4,241
Expired portion of excess NOLCO | 973 | 1,272 | ₱ 354
Digitel and DMPI [Member] |  |  |
Disclosure Of Other Income Expense [Line Items] |  |  |
Consolidated unrecognized deferred income tax assets | ₱ 1,362 | ₱ 1,421 |
Subic Tel and Clark Tel [Member] |  |  |
Disclosure Of Other Income Expense [Line Items] |  |  |
Special income tax rate as percentage of gross sales | 5.00% |  |

X
- Definition Amount of excess minimum corporate income tax deducted against regular corporate income tax. + References No definition available. + Details
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Namespace Prefix: | phi_
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- Definition Amount of net operating loss carry over deducted against future taxable income. + References No definition available. + Details
Name: | phi_AmountOfNetOperatingLossCarryOverDeductedAgainstFutureTaxableIncome
Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disclosure of other income (expense) line items. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Excess minimum corporate income tax. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition Expired Portion of Excess Minimum Corporate Income Tax + References No definition available. + Details
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Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
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- Definition Expired portion of net operating loss carry over. + References No definition available. + Details
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Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Net operating loss carry over. + References No definition available. + Details
Name: | phi_NetOperatingLossCarryOver
Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Percentage Of Special Increase In Income Tax Rate + References No definition available. + Details
Name: | phi_PercentageOfSpecialIncreaseInIncomeTaxRate
Namespace Prefix: | phi_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Unrecognized deferred income tax assets. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |