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Financial Assets and Liabilities - Summary of Movements of Consolidated Mark-to-Market Losses (Detail) - PHP (₱)
₱ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Changes In Fair Value Of Credit Derivative [Abstract]      
Net mark-to-market losses at beginning of the year ₱ (514) ₱ (71)  
Gains (losses) on derivative financial instruments (Note 4) 1,651 (284) ₱ (233)
Effective portion recognized in the profit or loss for the cash flow hedges (75) (156)  
Settlements, interest expense and others (169) 430  
Net fair value losses on cash flow hedges (Note 28) (967) (433) (330)
Net mark-to-market losses at end of the year ₱ (74) ₱ (514) ₱ (71)