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Income and Expenses - Summary of Changes in Contract Liabilities and Unearned Revenues Accounts (Detail) - PHP (₱) ₱ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Contract Liabilities [Abstract] |  |  |
Balances at beginning of the year | ₱ 8,483 | ₱ 7,182 | ₱ 8,541
Deferred during the year | 127,160 | 111,084 | 102,288
Recognized as revenue during the year | (126,072) | (109,783) | (103,647)
Balances at end of the year | ₱ 9,571 | ₱ 8,483 | ₱ 7,182

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- References No definition available. + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Contract liabilities and unearned revenues. + References No definition available. + Details
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Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Contract liability revenue as recognized. + References No definition available. + Details
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Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Deferred contract liabilities. + References No definition available. + Details
Name: | phi_DeferredContractLiabilities
Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration