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Interest-bearing Financial Liabilities - Summary of Scheduled Maturities of Consolidated Outstanding Long-term Debt at Nominal Values (Detail) - Dec. 31, 2020
₱ in Millions, $ in Millions
PHP (₱)
USD ($)
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) ₱ 224,027  
Less than 1 year [Member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 17,711  
2022 [Member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 15,131  
2023 [Member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 27,311  
2024 [Member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 15,648  
2025 [Member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 22,137  
Later than five years [member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 126,089  
U.S. Dollars [Member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 41,575 $ 866
U.S. Dollars [Member] | Less than 1 year [Member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 2,852 60
U.S. Dollars [Member] | 2022 [Member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 2,131 44
U.S. Dollars [Member] | 2023 [Member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 1,873 39
U.S. Dollars [Member] | 2024 [Member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 1,873 39
U.S. Dollars [Member] | 2025 [Member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 672 14
U.S. Dollars [Member] | Later than five years [member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 32,174 $ 670
Philippine Peso [Member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 182,452  
Philippine Peso [Member] | Less than 1 year [Member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 14,859  
Philippine Peso [Member] | 2022 [Member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 13,000  
Philippine Peso [Member] | 2023 [Member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 25,438  
Philippine Peso [Member] | 2024 [Member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 13,775  
Philippine Peso [Member] | 2025 [Member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) 21,465  
Philippine Peso [Member] | Later than five years [member]    
Disclosure Of Detailed Information About Borrowings [Line Items]    
Total long-term debt (Note 28) ₱ 93,915