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Investments in Associates and Joint Ventures - Carrying Value of PCEV's Investments in VIH (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]      
Investments in associates and joint ventures ₱ 52,123 ₱ 53,863 ₱ 55,427
Goodwill arising from acquisition 61,379 61,379  
VIH [Member]      
Disclosure of Investments in Associates and Joint Ventures [Line Items]      
Investments in associates and joint ventures ₱ 3,224 ₱ 4,848  
PCEV's noncontrolling interests 43.97% 48.74%  
Share in net assets of VIH ₱ 1,418 ₱ 2,363  
Goodwill arising from acquisition 5,283 5,856  
Carrying amount of interest in VIH 6,701 8,219  
Minority interest's share in net losses 1    
Carrying amount of interest in VIH ₱ 6,702 ₱ 8,219