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Financial Assets and Liabilities - Summary of Gross Carrying Amount of Financial Assets Not Subject to Impairment (Detail) - PHP (₱)
₱ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Financial Assets [Line Items]    
Financial assets at FVPL ₱ 380 ₱ 3,369
Total assets 75,089 63,671
Credit risk [member]    
Disclosure Of Financial Assets [Line Items]    
Total assets 402 3,411
Derivative Financial Assets – Net of Current Portion [Member] | Credit risk [member]    
Disclosure Of Financial Assets [Line Items]    
Financial assets at FVPL   1
Current Portion Of Derivative Financial Assets | Credit risk [member]    
Disclosure Of Financial Assets [Line Items]    
Financial assets at FVPL ₱ 22 ₱ 41