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Pension and Other Employee Benefits - Summary of Unlisted Equity Investments of Defined Benefit Pension Plans (Detail) - PHP (₱)
₱ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Unlisted Equity Investments ₱ 53,863 ₱ 55,427 ₱ 46,130
MediaQuest PDRs [Member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
% of Ownership 100.00% 100.00%  
Unlisted Equity Investments ₱ 10,050 ₱ 10,022  
Tahanan Mutual Building and Loan Association Inc [member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
% of Ownership 100.00% 100.00%  
Unlisted Equity Investments ₱ 544 ₱ 474  
BTF Holdings, Inc. [Member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
% of Ownership 100.00% 100.00%  
Unlisted Equity Investments ₱ 221 ₱ 211  
Unquoted equity investments [Member]      
Disclosure Of Fair Value Of Plan Assets [Line Items]      
Unlisted Equity Investments ₱ 10,815 ₱ 10,707