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Income Taxes - Summary of Amount of Unrecognized Deferred Income Tax Assets (Details) - PHP (₱) ₱ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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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 | ₱ 10,693 | ₱ 18,276
Consolidated unrecognized deferred income tax assets | 3,227 | 5,561
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 | 4,289 | 7,151
Accumulated provision for doubtful accounts [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 | 3,144 | 3,014
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 | 1,881 | 3,735
Impairment Allowance |  |
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items] |  |
Deductible temporary differences for which no deferred tax asset is recognized | 1,148 | 43
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 | 1,740
Asset retirement obligation [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 |  | 621
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 | 25 | 1,314
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 | 106 |
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 | 49 | 105
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 | 111
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 | 303
Derivative financial instruments and others [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 |  | ₱ 139

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