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Income Taxes - Summary of Changes in Consolidated Net Deferred Income Tax Assets (Liabilities) (Detail) - PHP (₱)
₱ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Major Components Of Tax Expense Income [Abstract]      
Net deferred income tax assets – balances at beginning of the year ₱ 19,556 ₱ 23,623  
Net deferred income tax liabilities – balances at beginning of the year (726) (2,583)  
Net balances at beginning of the year 13,216 18,830 ₱ 21,040
Provision for deferred income tax (2,348) (3,989) (6,267)
Movement charged directly to other comprehensive income (loss) (3,239) 1,811  
Others (27) (32)  
Net deferred income tax assets – balances at end of the year 13,385 19,556 23,623
Net deferred income tax liabilities – balances at end of the year ₱ (169) ₱ (726) ₱ (2,583)