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Investments in Associates and Joint Ventures - Changes in Accumulated Impairment Losses (Detail) - PHP (₱)
₱ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of Investments in Associates and Joint Ventures [Line Items]      
Balances at beginning of the year ₱ 53,863 ₱ 55,427  
Additional impairment (Note 4) 579 20 ₱ 111
Balances at end of the year 52,123 53,863 55,427
Accumulated Impairment Losses [Member]      
Disclosure of Investments in Associates and Joint Ventures [Line Items]      
Balances at beginning of the year 2,543 2,509  
Additional impairment (Note 4) 60 34  
Balances at end of the year ₱ 2,603 ₱ 2,543 ₱ 2,509