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Investment Properties - Summary of Changes in Investment Properties (Detail) - PHP (₱)
₱ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Investment Property [Line Items]    
Balances at beginning of the year ₱ 778 ₱ 777
Transfers from property and equipment 74  
Net gains (losses) from fair value adjustments charged to profit or loss 43 12
Disposals during the year   (11)
Balances at end of the year 895 778
Land [Member]    
Disclosure Of Investment Property [Line Items]    
Balances at beginning of the year 607 595
Transfers from property and equipment 70  
Net gains (losses) from fair value adjustments charged to profit or loss 51 23
Disposals during the year   (11)
Balances at end of the year 728 607
Land Improvements [Member]    
Disclosure Of Investment Property [Line Items]    
Balances at beginning of the year 5 6
Net gains (losses) from fair value adjustments charged to profit or loss (1) (1)
Balances at end of the year 4 5
Building [Member]    
Disclosure Of Investment Property [Line Items]    
Balances at beginning of the year 166 176
Transfers from property and equipment 4  
Net gains (losses) from fair value adjustments charged to profit or loss (7) (10)
Balances at end of the year ₱ 163 ₱ 166