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Income and Expenses - Additional Information (Detail) - PHP (₱) ₱ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Analysis Of Contract Balances [Abstract] |  |  |
Decrease in trade and other receivables | ₱ 1,219 |  |
Decrease in contract assets | 582 |  |
Contract liabilities and unearned revenues | 1,301 |  |
Noncurrent portion of contract liabilities and unearned revenues | 604 | ₱ 532 |
Current portion of contract liabilities and unearned revenues | ₱ 7,879 | 6,650 |
Decrease in service revenue and interconnection costs due to adjustments |  | ₱ 1,838 | ₱ 993

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- Definition Current portion of contract liabilities and unearned revenues. + References No definition available. + Details
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Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Decrease in service revenue and interconnection costs due to adjustments. + References No definition available. + Details
Name: | phi_DecreaseInServiceRevenueAndInterconnectionCostsDueToAdjustments
Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disclosure of analysis of contract balances. + References No definition available. + Details
Name: | phi_DisclosureOfAnalysisOfContractBalancesAbstract
Namespace Prefix: | phi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Increase decrease in contract assets. + References No definition available. + Details
Name: | phi_IncreaseDecreaseInContractAssets
Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Increase decrease in contract liabilities and unearned revenues. + References No definition available. + Details
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Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Increase decrease in trade and other receivables. + References No definition available. + Details
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Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Non-current portion of contract liabilities and unearned revenues. + References No definition available. + Details
Name: | phi_NonCurrentPortionOfContractLiabilitiesAndUnearnedRevenues
Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant