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Interest-bearing Financial Liabilities - Summary of Long-term Debt (Detail)
₱ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
PHP (₱)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
PHP (₱)
Dec. 31, 2018
USD ($)
Disclosure Of Detailed Information About Borrowings [Line Items]        
Total long-term debt (Notes 29 and 30) ₱ 192,556 $ 25 ₱ 176,276  
Long-term debt maturing within one year (Notes 28 and 29) 19,722   20,441  
Noncurrent portion of long-term debt (Note 28) 172,834   155,835  
U.S. Dollars [Member]        
Disclosure Of Detailed Information About Borrowings [Line Items]        
Total long-term debt (Notes 29 and 30) 17,029 335 23,352 $ 444
Philippine Peso [Member]        
Disclosure Of Detailed Information About Borrowings [Line Items]        
Total long-term debt (Notes 29 and 30) ₱ 175,527   152,924  
Export Credit Agencies-Supported Loans [Member] | Export Kreditnamnden [member] | U.S. Dollars [Member]        
Disclosure Of Detailed Information About Borrowings [Line Items]        
Interest Rates, description 1.4100% in 2019 and 2018      
Total long-term debt (Notes 29 and 30)     103 2
Term Loans [Member]        
Disclosure Of Detailed Information About Borrowings [Line Items]        
Total long-term debt (Notes 29 and 30) ₱ 154,410   122,470  
Term Loans [Member] | Others [Member] | U.S. Dollars [Member]        
Disclosure Of Detailed Information About Borrowings [Line Items]        
Interest Rates, description 2.8850% and US$ LIBOR + 0.7900% to 1.4500% in 2019 and 2.8850% and US$ LIBOR + 0.7900% to 1.6000% in 2018      
Total long-term debt (Notes 29 and 30) ₱ 17,029 $ 335 23,249 $ 442
Term Loans [Member] | Unsecured Term Loans [Member] | Philippine Peso [Member]        
Disclosure Of Detailed Information About Borrowings [Line Items]        
Interest Rates, description 3.9000% to 6.7339%; PHP BVAL + 0.6000% to 1.0000% and PDST-R2 + 0.5000% to 0.6000% in 2019 and 3.9000% to 6.7339%; PDST-R2/(1) PHP BVAL + 0.5000% to 1.0000% in 2018      
Total long-term debt (Notes 29 and 30) ₱ 154,410   122,470  
Philippine Peso Debts [Member] | Fixed ​Rate​ Corporate​ Notes [​Member] | Philippine Peso [Member]        
Disclosure Of Detailed Information About Borrowings [Line Items]        
Interest Rates, description 5.3938% to 5.9058% in 2019 and 2018      
Total long-term debt (Notes 29 and 30) ₱ 6,152   15,511  
Philippine Peso Debts [Member] | Fixed Rate Retail Bonds [Member] | Philippine Peso [Member]        
Disclosure Of Detailed Information About Borrowings [Line Items]        
Interest Rates, description 5.2250% to 5.2813% in 2019 and 2018      
Total long-term debt (Notes 29 and 30) ₱ 14,965   ₱ 14,943