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Investments in Associates and Joint Ventures - Changes in Cost of Investments (Detail) - PHP (₱)
₱ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Investments in Associates and Joint Ventures [Line Items]      
Balances at beginning of the year ₱ 55,427 ₱ 46,130  
Additions during the year 20 111 ₱ 5,633
Disposals   (1,710) (14,884)
Balances at end of the year 53,863 55,427 46,130
Costs [Member]      
Disclosure of Investments in Associates and Joint Ventures [Line Items]      
Balances at beginning of the year 59,519 51,487  
Additions during the year 80 13,247  
Disposals   (5,230)  
Translation and other adjustments (83) 15  
Balances at end of the year ₱ 59,516 ₱ 59,519 ₱ 51,487