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Income Taxes - Summary of Amount of Unrecognized Deferred Income Tax Assets (Details) - PHP (₱)
₱ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]    
Deductible temporary differences for which no deferred tax asset is recognized ₱ 6,421 ₱ 7,815
Consolidated unrecognized deferred income tax assets 1,940 2,294
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 2,907 2,947
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 1,358 3,322
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 1,284 1,146
Provisions [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 761 116
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
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 61  
Excess MCIT over RCIT [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 20 27
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 5 45
Accumulated write-down of inventories to net realizable values [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 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 17 95
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 10 ₱ 1
Interest on subordinated shareholder advances [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)