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Income Taxes - Summary of Components of Net Deferred Income Tax Assets and Liabilities (Detail) - PHP (₱) ₱ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | ₱ 19,556 | ₱ 23,623 | ₱ 27,697
Net deferred income tax liabilities | 726 | 2,583 | ₱ 2,981
Unamortized past service pension costs [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 4,874 | 5,846 |
Accumulated provision for doubtful accounts [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 3,577 | 3,806 |
Provisions [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 2,917 | 1,661 |
Customer list and trademark [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 1,116 | 3,890 |
Pension and other employee benefits [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 6,394 | 4,886 |
Unearned revenues [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 2,509 | 2,108 |
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 | 699 | 701 |
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 | 666 | 393 |
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 | 61 | 138 |
NOLCO [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 88 | 432 |
Excess MCIT over RCIT [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 3 | 1,408 |
Derivative financial instruments [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 33 |  |
Taxes and duties capitalized [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | (124) |  |
Unrealized foreign exchange losses (gains) [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | (457) | 580 |
Others [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | (2,800) | (2,226) |
Net deferred income tax liabilities | 80 | 87 |
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 | 1,964 |
Unrealized foreign exchange gains [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax liabilities | 167 | 254 |
Investment Property [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax liabilities | ₱ 569 | ₱ 278 |

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