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Financial Assets at FVPL - Additional Information (Detail) € / shares in Units, ₱ in Millions, € in Millions, $ in Millions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
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Oct. 25, 2021 PHP (₱) | Oct. 25, 2021 USD ($) | Jul. 31, 2020 EUR (€) shares | Jun. 19, 2020 USD ($) | Jan. 31, 2020 EUR (€) shares | Oct. 09, 2019 EUR (€) shares | Dec. 15, 2018 USD ($) | Dec. 14, 2018 | Dec. 06, 2018 EUR (€) shares | Nov. 28, 2018 | May 23, 2018 EUR (€) shares | May 04, 2018 PHP (₱) shares | May 04, 2018 EUR (€) shares | Apr. 16, 2018 € / shares shares | Feb. 27, 2018 USD ($) | Aug. 04, 2017 PHP (₱) | Aug. 04, 2017 USD ($) | Mar. 10, 2016 PHP (₱) | Mar. 10, 2016 USD ($) | Sep. 03, 2015 USD ($) | Apr. 23, 2015 PHP (₱) | Apr. 23, 2015 USD ($) | Oct. 02, 2014 | Oct. 31, 2020 PHP (₱) shares | Oct. 31, 2020 EUR (€) shares | Sep. 30, 2020 PHP (₱) shares | Sep. 30, 2020 EUR (€) shares | Feb. 28, 2015 | Aug. 31, 2014 PHP (₱) | Nov. 30, 2010 PHP (₱) shares | Sep. 30, 2018 PHP (₱) shares | Sep. 30, 2018 EUR (€) shares | Dec. 31, 2021 | Dec. 31, 2020 PHP (₱) | Dec. 31, 2019 PHP (₱) shares | Dec. 31, 2019 EUR (€) shares | Mar. 15, 2019 USD ($) | Dec. 18, 2015 USD ($) | Sep. 04, 2015 USD ($) | Oct. 01, 2014 € / shares | Aug. 31, 2014 EUR (€)
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of subscribed promissory note in associate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of subscribed promissory note issued by associate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible promissory note payable |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.0 |  |
Aggregate amount against shares sold |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 508.0 | € 9 | ₱ 1,508.0 | € 26 |  |  |  | ₱ 1,346.0 | € 22 |  |  | ₱ 1,021.0 | € 18 |  |  |  |  |
Date of investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Aug. 07, 2014 |  |  |  |  |  |  |  |
Non-current financial assets available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 19,577.0 |  |  |  |  |  |  |  |  |  |  |  | € 333
Percentage of ownership |  |  |  |  |  |  | 5.30% | 7.30% |  |  |  |  |  | 67.40% |  |  |  |  |  |  |  |  | 6.60% |  |  |  |  | 6.10% | 10.00% |  |  |  |  |  |  |  |  |  |  |  |
Initial public offering | € / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | € 42.50 |
Number of shares buyback pursuant to share buyback Program | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,720,000 |  |  |  |  |  |  |  |  |  |  |
Offering price per share | € / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | € 24 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum number of shares committed to accept offer | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares accepted against tender | shares |  |  |  |  |  |  |  |  |  |  |  | 7,000,000 | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total consideration pursuant to share buyback program |  |  |  |  |  |  |  |  |  |  |  | ₱ 10,059.0 | € 163 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 6,505.0 |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership |  |  | 1.40% |  |  | 1.30% |  |  | 1.70% | 48.74% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 38.45% | 43.97% |  |  |  |  |  |  |
Shares redeemed | shares |  |  | 1,600,000 |  |  | 1,700,000 |  |  | 1,900,000 |  | 10,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reducing share capital | € |  |  | € 136 |  |  | € 151 |  |  | € 153 |  | € 154 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Common Shares Sold | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 | 500,000 | 1,400,000 | 1,400,000 |  |  |  | 700,000 | 700,000 |  |  | 700,000 | 700,000 |  |  |  |  |
Purchase of available-for-sale financial investments |  |  |  | $ 22.5 |  |  |  |  |  |  |  |  |  |  |  | ₱ 75.0 | $ 1.5 |  |  |  | ₱ 686.0 | $ 15.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible note held |  |  |  |  |  |  | $ 1.5 |  |  |  |  |  |  |  |  |  |  |  | $ 15.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to ordinary shares | ₱ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 20.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation gain |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 898.0 | 19.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Increasing fair value of investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 1,584.0 | $ 34.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Conversion of notes to ordinary shares |  |  |  |  |  |  | $ 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derecognition of investment charged to other income (expenses) – net | ₱ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ₱ 599.0 |  |  |  |  |  |  |
Potential Ordinary Share Transactions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares redeemed | shares |  |  |  |  | 13,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reducing share capital | € |  |  |  |  | € 137 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Top of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership |  |  |  |  |  |  |  |  |  |  | 2.10% | 6.10% | 6.10% |  |  |  |  |  |  |  |  |  |  |  |  | 1.40% | 1.40% |  |  |  | 2.10% | 2.10% |  | 4.90% | 1.70% | 1.70% |  |  |  |  |
Top of range [member] | Potential Ordinary Share Transactions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 1.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bottom of range [member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership |  |  |  |  |  |  |  |  |  |  | 2.00% | 2.00% | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  | 0.40% | 0.40% |  |  |  | 1.70% | 1.70% |  | 5.30% | 1.30% | 1.30% |  |  |  |  |
Bottom of range [member] | Potential Ordinary Share Transactions [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Ownership |  |  |  |  | 1.30% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Phunware [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business combination enterprise value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 301.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares conversion ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of total consideration paid for common shares purchase |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.6 |  |  |  |
Aggregate amount against shares sold | ₱ 482.0 | $ 9.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on fair value changes | ₱ | 306.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on sales of common shares | ₱ | ₱ 115.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Phunware [Member] | Series F Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure Of Financial Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of total consideration of preferred shares subscribed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3.0 |  |  |

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- Definition Number of shares accepted against tender. + References No definition available. + Details
Name: | phi_NumberOfSharesAcceptedAgainstTender
Namespace Prefix: | phi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Offering price per share. + References No definition available. + Details
Name: | phi_OfferingPricePerShare
Namespace Prefix: | phi_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of ownership held. + References No definition available. + Details
Name: | phi_PercentageOfOwnershipHeld
Namespace Prefix: | phi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of subscribed promissory note in associate. + References No definition available. + Details
Name: | phi_PercentageOfSubscribedPromissoryNoteInAssociate
Namespace Prefix: | phi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Preferred shares conversion ratio. + References No definition available. + Details
Name: | phi_PreferredSharesConversionRatio
Namespace Prefix: | phi_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Reducing share capital. + References No definition available. + Details
Name: | phi_ReducingShareCapital
Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Shares redeemed. + References No definition available. + Details
Name: | phi_SharesRedeemed
Namespace Prefix: | phi_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Valuation gain for conversion of security. + References No definition available. + Details
Name: | phi_ValuationGainForConversionOfSecurity
Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=ifrs-full_PotentialOrdinaryShareTransactionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=phi_PhunwareIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=phi_SeriesFPreferredSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |