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Income Taxes - Summary of Components of Net Deferred Income Tax Assets and Liabilities (Detail) - PHP (₱)
₱ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Net deferred income tax assets ₱ 13,385 ₱ 19,556 ₱ 23,623
Net deferred income tax liabilities 169 726 ₱ 2,583
Pension and other employee benefits [Member]      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Net deferred income tax assets 3,590 6,394  
Unamortized past service pension costs [Member]      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Net deferred income tax assets 3,364 4,874  
Unearned revenues [Member]      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Net deferred income tax assets 3,022 2,509  
Accumulated provision for expected credit loss [Member]      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Net deferred income tax assets 2,920 3,577  
Accumulated write-down of inventories to net realizable values [Member]      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Net deferred income tax assets 662 699  
Lease liability over right-of-use assets under IFRS 16 [Member]      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Net deferred income tax assets 581 666  
Unrealized foreign exchange losses (gains) [Member]      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Net deferred income tax assets 403 (457)  
Customer list and trademark [Member]      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Net deferred income tax assets 129 1,116  
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 79 61  
NOLCO [Member]      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Net deferred income tax assets 10 88  
Excess MCIT over RCIT [Member]      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Net deferred income tax assets 1 3  
Derivative financial instruments [Member]      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Net deferred income tax assets (30) 33  
Taxes and duties capitalized [Member]      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Net deferred income tax assets (141) (124)  
Capitalized charges and others [Member]      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Net deferred income tax assets (1,205) 117  
Investment Property [Member]      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Net deferred income tax liabilities 241 569  
Unrealized foreign exchange gains [Member]      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Net deferred income tax liabilities 5 167  
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   70  
Others [Member]      
Disclosure Of Temporary Difference Unused Tax Losses And Unused Tax Credits [Line Items]      
Net deferred income tax liabilities ₱ 77 ₱ 80