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v3.21.1

Accounts Payable - Additional Information (Detail) - PHP (₱) ₱ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Trade Financing Arrangements [Member] |  |
Accounts Payable [Line Items] |  |
Amount reclassified from accounts payable | ₱ 1,155 | ₱ 4,999
Trade Financing Arrangements [Member] | Parent [Member] |  |
Accounts Payable [Line Items] |  |
Trade receivables | 400 | 1,799
Trade Financing Arrangements [Member] | Smart [Member] |  |
Accounts Payable [Line Items] |  |
Trade receivables | ₱ 1,155 | ₱ 3,200
Top of range [member] |  |
Accounts Payable [Line Items] |  |
Accounts payable settlement period | 180 days |

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- Definition The amount due from customers for goods and services sold. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_78_b&doctype=Standard -URIDate 2020-01-01 + Details
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Balance Type: | debit
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- Definition Accounts payable. + References No definition available. + Details
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Namespace Prefix: | phi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Accounts payable settlement period. + References No definition available. + Details
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Namespace Prefix: | phi_
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Balance Type: | na
Period Type: | duration

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- Definition Amount reclassified from accounts payable. + References No definition available. + Details
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Namespace Prefix: | phi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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: |
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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: |