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Income Taxes - Summary of Amount of Unrecognized Deferred Income Tax Assets (Details) - PHP (₱) ₱ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognized | ₱ 7,583 | ₱ 10,693
Consolidated unrecognized deferred income tax assets | 2,294 | 3,227
NOLCO [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognized | 3,322 | 4,289
Accumulated provision for expected credit losses [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognized | 2,947 | 3,144
Fixed asset impairment [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognized | 1,146 | 1,148
Gain on disposal of asset [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognized | 105 | 106
Pension and other employee benefits [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognized |  | 13
Unrealized foreign exchange losses [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognized | 45 | 49
MCIT [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognized | 27 | 27
Accumulated Writedown Of Inventories To Net Realizable Values |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognized | 11 | 11
Unearned revenues [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognized | 95 | 25
Operating lease [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognized | 1 |
Provision for other assets [Member] |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognized | ₱ (116) | ₱ 1,881

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