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Income Taxes - Summary of Components of Net Deferred Income Tax Assets and Liabilities (Detail) - PHP (₱) ₱ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | ₱ 23,623 | ₱ 27,697 | ₱ 30,466
Net deferred income tax liabilities | 2,583 | 2,981 | ₱ 3,366
Unamortized past service pension costs [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 5,846 | 5,252 |
Pension and other employee benefits [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 4,886 | 4,296 |
Lease liabilities [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 4,474 |  |
Customer list and trademark [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 3,890 | 4,670 |
Accumulated provision for expected credit losses [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 3,806 | 3,709 |
Unearned revenues [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 2,108 | 1,776 |
Provision for other assets [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 1,661 | 1,595 |
MCIT [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 1,408 | 905 |
Accumulated provision for inventory obsolescence and write-down [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 701 | 916 |
Unrealized foreign exchange gains (losses) [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 580 | 1,092 |
Net deferred income tax liabilities | 254 | 366 |
NOLCO [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | 432 | 3,231 |
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 | 138 | 1,870 |
Derivative financial instruments [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets |  | (58) |
ROU assets [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | (4,081) |  |
Others [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax assets | (2,226) | (1,557) |
Net deferred income tax liabilities | 87 | 156 |
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 | 1,964 | 2,175 |
Investment property [member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax liabilities | ₱ 278 | 277 |
Undepreciated capitalized interest charges [Member] |  |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |  |
Net deferred income tax liabilities |  | ₱ 7 |

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