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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, 2019
Dec. 31, 2018
Disclosure Of Financial Assets [Line Items]    
Financial assets at FVPL ₱ 3,369 ₱ 4,763
Total assets 63,671 95,747
Credit risk [member]    
Disclosure Of Financial Assets [Line Items]    
Total assets 3,411 5,086
Derivative Financial Assets – Net of Current Portion [Member] | Credit risk [member]    
Disclosure Of Financial Assets [Line Items]    
Financial assets at FVPL 1 140
Current Portion of Derivative Financial Assets [Member] | Credit risk [member]    
Disclosure Of Financial Assets [Line Items]    
Financial assets at FVPL ₱ 41 ₱ 183