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Pension and Other Employee Benefits - Summary of Shares of Stocks of Defined Benefit Pension Plans (Detail) - PHP (₱)
₱ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Shares of stocks ₱ 1,903 ₱ 2,077
Preferred Stock [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Shares of stocks 360 360
PSE [member] | Common Stock [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Shares of stocks 1,026 1,161
Parent [Member] | Common Stock [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Shares of stocks 35 26
Others [Member] | Common Stock [Member]    
Disclosure Of Fair Value Of Plan Assets [Line Items]    
Shares of stocks ₱ 482 ₱ 530