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Investment Properties - Summary of Changes in Investment Properties (Detail) - PHP (₱)
₱ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Investment Property [Line Items]    
Balances at beginning of the year ₱ 777 ₱ 1,635
Net gains (losses) from fair value adjustments charged to profit or loss 12 378
Disposals during the year (11)  
Transfers to property and equipment   (1,236)
Balances at end of the year 778 777
Land [Member]    
Disclosure Of Investment Property [Line Items]    
Balances at beginning of the year 596 1,322
Net gains (losses) from fair value adjustments charged to profit or loss 23 389
Disposals during the year (11)  
Transfers to property and equipment   (1,115)
Balances at end of the year 608 596
Land Improvements [Member]    
Disclosure Of Investment Property [Line Items]    
Balances at beginning of the year 7 8
Net gains (losses) from fair value adjustments charged to profit or loss (6) (1)
Balances at end of the year 1 7
Building [Member]    
Disclosure Of Investment Property [Line Items]    
Balances at beginning of the year 174 305
Net gains (losses) from fair value adjustments charged to profit or loss (5) (10)
Transfers to property and equipment   (121)
Balances at end of the year ₱ 169 ₱ 174