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Income Taxes - Summary of Components of Net Deferred Income Tax Assets and Liabilities (Detail) - PHP (₱) ₱ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax assets | ₱ 13,385 | ₱ 19,556 | ₱ 23,623
Net deferred income tax liabilities | 169 | 726 | ₱ 2,583
Pension and other employee benefits [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax assets | 3,590 | 6,394 |
Unamortized past service pension costs [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax assets | 3,364 | 4,874 |
Unearned revenues [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax assets | 3,022 | 2,509 |
Accumulated provision for expected credit loss [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax assets | 2,920 | 3,577 |
Accumulated write-down of inventories to net realizable values [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax assets | 662 | 699 |
Lease liability over right-of-use assets under IFRS 16 [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax assets | 581 | 666 |
Unrealized foreign exchange losses (gains) [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax assets | 403 | (457) |
Customer list and trademark [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax assets | 129 | 1,116 |
Fixed asset impairment/depreciation due to shortened life of property and equipment [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax assets | 79 | 61 |
NOLCO [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax assets | 10 | 88 |
Excess MCIT over RCIT [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax assets | 1 | 3 |
Derivative financial instruments [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax assets | (30) | 33 |
Taxes and duties capitalized [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax assets | (141) | (124) |
Capitalized charges and others [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax assets | (1,205) | 117 |
Investment Property [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax liabilities | 241 | 569 |
Unrealized foreign exchange gains [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax liabilities | 5 | 167 |
Intangible assets and fair value adjustment on assets acquired - net of amortization [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax liabilities |  | 70 |
Others [Member] |  |  |
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items] |  |  |
Net deferred income tax liabilities | ₱ 77 | ₱ 80 |

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- Definition The amounts of income taxes payable in future periods in respect of taxable temporary differences. [Refer: Temporary differences [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph g -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_g_i&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 54 -Subparagraph o -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_o&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 56 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_56&doctype=Standard -URIDate 2021-03-24 + Details
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