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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
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