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Income and Expenses - Summary of Movement in Allowance for Expected Credit Losses of Contracts Assets (Detail) - PHP (₱) ₱ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Movement In Allowance For Expected Credit Losses Of Contract Assets [Abstract] |  |  |
Balances at beginning of the year | ₱ 70 | ₱ 131 | ₱ 114
Reclassification | 22 | (61) |
Provisions |  |  | 17
Balances at end of the year | ₱ 92 | ₱ 70 | ₱ 131

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- Definition Contract assets allowance for expected credit loss. + References No definition available. + Details
Name: | phi_ContractAssetsAllowanceForExpectedCreditLoss
Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Contract assets provision for expected credit losses. + References No definition available. + Details
Name: | phi_ContractAssetsProvisionForExpectedCreditLosses
Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Contract assets reclassification for expected credit losses. + References No definition available. + Details
Name: | phi_ContractAssetsReclassificationForExpectedCreditLosses
Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Movement in allowance for expected credit losses of contract assets. + References No definition available. + Details
Name: | phi_MovementInAllowanceForExpectedCreditLossesOfContractAssetsAbstract
Namespace Prefix: | phi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration