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Property and Equipment - Summary of Estimated Useful Lives of Property and Equipment (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Cable and wire facilities [Member] | Bottom of range [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 5 years | 5 years
Cable and wire facilities [Member] | Top of range [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 15 years | 15 years
Central equipment [Member] | Bottom of range [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 3 years | 3 years
Central equipment [Member] | Top of range [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 15 years | 15 years
Network facilities [Member] | Bottom of range [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 3 years | 3 years
Network facilities [Member] | Top of range [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 15 years | 15 years
Buildings [Member] | Bottom of range [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 25 years | 25 years
Buildings [Member] | Top of range [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 50 years | 50 years
Vehicles, furniture and other network equipment [Member] | Bottom of range [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 3 years | 3 years
Vehicles, furniture and other network equipment [Member] | Top of range [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 15 years | 15 years
Information origination and termination equipment [Member] | Bottom of range [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 3 years | 3 years
Information origination and termination equipment [Member] | Top of range [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 15 years | 7 years
Land improvements [Member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 10 years | 10 years
IT systems and platforms [Member] | Bottom of range [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 3 years | 3 years
IT systems and platforms [Member] | Top of range [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 5 years | 5 years
Leasehold improvements [Member] | Bottom of range [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 3 years | 3 years
Leasehold improvements [Member] | Top of range [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 10 years | 10 years
Security platforms [Member] | Bottom of range [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 3 years | 3 years
Security platforms [Member] | Top of range [member] |  |
Disclosure Of Property Plant And Equipment [Line Items] |  |
Estimated useful lives of assets | 5 years | 5 years

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- Definition Description of useful life used for property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2020-01-01 -Paragraph 73 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=16&code=ifrs-tx-2020-en-r&anchor=para_73_c&doctype=Standard -URIDate 2020-01-01 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=phi_CentralEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=phi_LandImprovements1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=phi_ITSystemsAndPlatformsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_LeaseholdImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=phi_SecurityPlatformsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |