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Financial Assets at FVPL/Available-for-Sale Financial Investments - Summary of Details on Investment in Rocket (Detail)
€ / shares in Units, ₱ in Millions, € in Millions
12 Months Ended
Dec. 31, 2018
PHP (₱)
Dec. 31, 2018
EUR (€)
€ / shares
Dec. 31, 2017
PHP (₱)
Dec. 31, 2017
EUR (€)
€ / shares
Dec. 31, 2016
PHP (₱)
Dec. 31, 2016
EUR (€)
€ / shares
Disclosure Of Financial Assets [Line Items]            
Total market value as at beginning of the year (in million pesos) ₱ 15,165          
Total market value as at end of the year (in million Euros)     ₱ 15,165      
Recognized in profit or loss (in million pesos)     (540)   ₱ (5,381)  
Rocket Internet S E [Member]            
Disclosure Of Financial Assets [Line Items]            
Total market value as at beginning of the year (in million pesos) 12,848   10,058      
Impairment loss     (540)      
Fair value adjustment in other comprehensive income     3,330      
Total market value as at end of the year (in million Euros) 3,128   12,848   10,058  
Recognized in profit or loss (in million pesos)     (540)   (5,381)  
Fair value adjustment in profit or loss (157)          
Disposal of investments (9,563)          
Rocket [Member] | Rocket Internet S E [Member]            
Disclosure Of Financial Assets [Line Items]            
Total market value as at beginning of the year (in million pesos) 12,848 € 213 10,058 € 193 14,587  
Closing price per share at end of the year (in Euros) | € / shares   € 20.18   € 21.13   € 19.13
Total market value as at end of the year (in million Euros) 3,128 € 52 12,848 € 213 10,058 € 193
Total cost of sold shares (in million pesos) 9,563          
Net gains (losses) recognized during the year (in million pesos) (157)   2,790   (4,529)  
Recognized in profit or loss (in million pesos) ₱ (157)   (540)   (5,381)  
Recognized in other comprehensive loss (in million pesos)     ₱ 3,330   ₱ 852