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Financial Assets and Liabilities - Summary of Carrying Amounts, by Maturity, of Financial Instruments that are Expected to Have Exposure on Interest Rate Risk (Detail)
₱ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
PHP (₱)
Dec. 31, 2019
PHP (₱)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱ ₱ 75,089 ₱ 63,671    
Long-term Debt | ₱ 415,474 372,490    
Fair Value [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱ 8,023 13,196    
Long-term Debt | ₱ 8,385 7,964    
Costs [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱ 91,914 80,873    
Interest rate risk [member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt 540 952 $ 11 $ 19
Interest rate risk [member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt ₱ 161,597 ₱ 156,996 3,365 3,090
Interest rate risk [member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Borrowings, interest rate basis — —    
Interest rate risk [member] | Debt Instruments at Amortized Cost [Member] | U.S. Dollars [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets ₱ 1,153   24  
Interest rate risk [member] | Debt Instruments at Amortized Cost [Member] | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets   ₱ 150   3
Interest rate risk [member] | Cash In Bank | U.S. Dollars [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 2,337 1,586 49 31
Interest rate risk [member] | Cash In Bank | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 4,940 4,228 103 83
Interest rate risk [member] | Cash In Bank | Other Currencies        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets   92   2
Interest rate risk [member] | Temporary Cash Investments | U.S. Dollars [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 12,222 3,645 254 72
Interest rate risk [member] | Temporary Cash Investments | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 18,490 14,018 385 276
Interest rate risk [member] | Short Term Investments1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 40,131 24,033 836 474
Interest rate risk [member] | Short Term Investments1 | U.S. Dollars [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 480   10  
Interest rate risk [member] | Short Term Investments1 | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 509 29 11 1
Interest rate risk [member] | Short Term Investments1 | Other Currencies        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets   285   6
Interest rate risk [member] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt ₱ 224,027 ₱ 193,047 4,665 3,800
Interest rate risk [member] | Less than 1 year [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     258 42
Borrowings, interest rate basis 5.2250      
Interest rate risk [member] | Less than 1 year [Member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Borrowings, interest rate basis   4.4850    
Interest rate risk [member] | Less than 1 year [Member] | Philippine Peso [Member] | Top of range [member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Borrowings, interest rate basis   5.5000    
Interest rate risk [member] | Less than 1 year [Member] | Debt Instruments at Amortized Cost [Member] | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets       3
Interest rate   4.8371%    
Interest rate risk [member] | Less than 1 year [Member] | Cash In Bank | U.S. Dollars [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets     49 31
Interest rate risk [member] | Less than 1 year [Member] | Cash In Bank | U.S. Dollars [Member] | Bottom of range [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate 0.01% 0.01%    
Interest rate risk [member] | Less than 1 year [Member] | Cash In Bank | U.S. Dollars [Member] | Top of range [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate 0.50% 1.00%    
Interest rate risk [member] | Less than 1 year [Member] | Cash In Bank | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets     103 83
Interest rate risk [member] | Less than 1 year [Member] | Cash In Bank | Philippine Peso [Member] | Bottom of range [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate 0.05% 0.05%    
Interest rate risk [member] | Less than 1 year [Member] | Cash In Bank | Philippine Peso [Member] | Top of range [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate 1.25% 1.25%    
Interest rate risk [member] | Less than 1 year [Member] | Cash In Bank | Other Currencies        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets       2
Interest rate risk [member] | Less than 1 year [Member] | Cash In Bank | Other Currencies | Bottom of range [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate   0.10%    
Interest rate risk [member] | Less than 1 year [Member] | Cash In Bank | Other Currencies | Top of range [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate   0.50%    
Interest rate risk [member] | Less than 1 year [Member] | Temporary Cash Investments | U.S. Dollars [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets     254 72
Interest rate risk [member] | Less than 1 year [Member] | Temporary Cash Investments | U.S. Dollars [Member] | Bottom of range [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate 0.025% 0.70%    
Interest rate risk [member] | Less than 1 year [Member] | Temporary Cash Investments | U.S. Dollars [Member] | Top of range [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate 0.375% 4.75%    
Interest rate risk [member] | Less than 1 year [Member] | Temporary Cash Investments | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets     385 276
Interest rate risk [member] | Less than 1 year [Member] | Temporary Cash Investments | Philippine Peso [Member] | Bottom of range [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate 0.125% 0.125%    
Interest rate risk [member] | Less than 1 year [Member] | Temporary Cash Investments | Philippine Peso [Member] | Top of range [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate 1.60% 5.00%    
Interest rate risk [member] | Less than 1 year [Member] | Short Term Investments1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets     812 474
Interest rate risk [member] | Less than 1 year [Member] | Short Term Investments1 | U.S. Dollars [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱ ₱ 10      
Interest rate risk [member] | Less than 1 year [Member] | Short Term Investments1 | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets     11 1
Interest rate 2.00%      
Interest rate risk [member] | Less than 1 year [Member] | Short Term Investments1 | Philippine Peso [Member] | Bottom of range [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate   1.50%    
Interest rate risk [member] | Less than 1 year [Member] | Short Term Investments1 | Philippine Peso [Member] | Top of range [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate   3.00%    
Interest rate risk [member] | Less than 1 year [Member] | Short Term Investments1 | Other Currencies        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets       6
Interest rate   0.00%    
Interest rate risk [member] | Less than 1 year [Member] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     258 300
Interest rate risk [member] | 1-2 years [Member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     $ 11 $ 15
Fixed Rate 2.885% 2.885% 2.885% 2.885%
Interest rate risk [member] | 1-2 years [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     $ 313 $ 376
Interest rate risk [member] | 1-2 years [Member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Borrowings, interest rate basis 3.9000 3.9000    
Interest rate risk [member] | 1-2 years [Member] | Philippine Peso [Member] | Top of range [member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Borrowings, interest rate basis 6.7339 6.7339    
Interest rate risk [member] | 1-2 years [Member] | Debt Instruments at Amortized Cost [Member] | U.S. Dollars [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets     24  
Interest rate risk [member] | 1-2 years [Member] | Debt Instruments at Amortized Cost [Member] | U.S. Dollars [Member] | Bottom of range [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate 0.90%      
Interest rate risk [member] | 1-2 years [Member] | Debt Instruments at Amortized Cost [Member] | U.S. Dollars [Member] | Top of range [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate 2.00%      
Interest rate risk [member] | 1-2 years [Member] | Short Term Investments1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets     24  
Interest rate risk [member] | 1-2 years [Member] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     426 536
Interest rate risk [member] | 2-3 years [Member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt       $ 4
Fixed Rate   2.885%   2.885%
Interest rate risk [member] | 2-3 years [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     525 $ 302
Interest rate risk [member] | 2-3 years [Member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Borrowings, interest rate basis 3.9000 3.9000    
Interest rate risk [member] | 2-3 years [Member] | Philippine Peso [Member] | Top of range [member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Borrowings, interest rate basis 6.7339 6.7339    
Interest rate risk [member] | 2-3 years [Member] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     568 335
Interest rate risk [member] | 3-5 years [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     657 673
Interest rate risk [member] | 3-5 years [Member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Borrowings, interest rate basis 3.9500 3.9000    
Interest rate risk [member] | 3-5 years [Member] | Philippine Peso [Member] | Top of range [member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Borrowings, interest rate basis 6.7339 6.7339    
Interest rate risk [member] | 3-5 years [Member] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     787 793
Interest rate risk [member] | Later than five years [member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     1,612 1,697
Interest rate risk [member] | Later than five years [member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Borrowings, interest rate basis 4.2500 4.2500    
Interest rate risk [member] | Later than five years [member] | Philippine Peso [Member] | Top of range [member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Borrowings, interest rate basis 6.7339 6.7339    
Interest rate risk [member] | Later than five years [member] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     2,626 1,836
Interest rate risk [member] | Floating interest rate [member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt ₱ 20,855 ₱ 18,975 434 374
Borrowings, interest rate basis — —    
Interest rate risk [member] | Floating interest rate [member] | Less than 1 year [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt       93
Borrowings, interest rate basis — 1.0000% over PHP BVAL    
Interest rate risk [member] | Floating interest rate [member] | 1-2 years [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     9 69
Borrowings, interest rate basis 0.5000% to 0.7500% over PHP BVAL (floor rate 4.5000%) 0.5000% to 1.0000% over PHP BVAL    
Interest rate risk [member] | Floating interest rate [member] | 2-3 years [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     4 3
Borrowings, interest rate basis 0.5000% to 0.7500% over PHP BVAL (floor rate 4.5000%) 0.5000% to 0.6000% over PHP BVAL    
Interest rate risk [member] | Floating interest rate [member] | 3-5 years [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     77 70
Borrowings, interest rate basis 0.5000% to 0.7500% over PHP BVAL (floor rate 4.5000%) 0.5000% to 0.6000% over PHP BVAL    
Interest rate risk [member] | Floating interest rate [member] | Later than five years [member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     344 139
Borrowings, interest rate basis 0.6000% to 0.7500% over PHP BVAL (floor rate 4.5000%) 0.6000% over PHP BVAL    
Interest rate risk [member] | Fair Value [Member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt ₱ 545 ₱ 945 11 19
Interest rate risk [member] | Fair Value [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt ₱ 167,520 ₱ 153,644 3,489 3,024
Interest rate risk [member] | Fair Value [Member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Borrowings, interest rate basis — —    
Interest rate risk [member] | Fair Value [Member] | Debt Instruments at Amortized Cost [Member] | U.S. Dollars [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets ₱ 1,163   24  
Interest rate risk [member] | Fair Value [Member] | Debt Instruments at Amortized Cost [Member] | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets   ₱ 150   3
Interest rate risk [member] | Fair Value [Member] | Cash In Bank | U.S. Dollars [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 2,337 1,586 49 31
Interest rate risk [member] | Fair Value [Member] | Cash In Bank | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 4,940 4,228 103 83
Interest rate risk [member] | Fair Value [Member] | Cash In Bank | Other Currencies        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets   92   2
Interest rate risk [member] | Fair Value [Member] | Temporary Cash Investments | U.S. Dollars [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 12,222 3,645 254 72
Interest rate risk [member] | Fair Value [Member] | Temporary Cash Investments | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 18,490 14,018 385 276
Interest rate risk [member] | Fair Value [Member] | Short Term Investments1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 40,141 24,033 836 474
Interest rate risk [member] | Fair Value [Member] | Short Term Investments1 | U.S. Dollars [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 480   10  
Interest rate risk [member] | Fair Value [Member] | Short Term Investments1 | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 509 29 11 1
Interest rate risk [member] | Fair Value [Member] | Short Term Investments1 | Other Currencies        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets   285   6
Interest rate risk [member] | Fair Value [Member] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt 231,478 189,687 4,821 3,734
Interest rate risk [member] | Fair Value [Member] | Floating interest rate [member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt ₱ 20,855 ₱ 18,975 434 374
Borrowings, interest rate basis — —    
Interest rate risk [member] | U S Dollar Notes | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt ₱ 28,813   $ 600  
Interest rate risk [member] | U S Dollar Notes | Later than five years [member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt | ₱ ₱ 600      
Interest rate risk [member] | U S Dollar Notes | Later than five years [member] | U.S. Dollars [Member] | Bottom of range [member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Fixed Rate 2.50%   2.50%  
Interest rate risk [member] | U S Dollar Notes | Later than five years [member] | U.S. Dollars [Member] | Top of range [member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Fixed Rate 3.45%   3.45%  
Interest rate risk [member] | U S Dollar Notes | Fair Value [Member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt ₱ 30,336   $ 632  
Interest rate risk [member] | U.S. Dollar Debts [Member] | Floating interest rate [member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt ₱ 12,222 ₱ 16,124 255 317
Borrowings, interest rate basis — —    
Interest rate risk [member] | U.S. Dollar Debts [Member] | Floating interest rate [member] | Less than 1 year [Member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt       165
Borrowings, interest rate basis — 0.7900% to 1.4500% over LIBOR    
Interest rate risk [member] | U.S. Dollar Debts [Member] | Floating interest rate [member] | 1-2 years [Member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     93 76
Borrowings, interest rate basis 0.7900% to 1.0500% over LIBOR 0.7900% to 0.9500% over LIBOR    
Interest rate risk [member] | U.S. Dollar Debts [Member] | Floating interest rate [member] | 2-3 years [Member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     39 26
Borrowings, interest rate basis 1.0500% over LIBOR 0.7900% to 0.9500% over LIBOR    
Interest rate risk [member] | U.S. Dollar Debts [Member] | Floating interest rate [member] | 3-5 years [Member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     53 50
Borrowings, interest rate basis 1.0500% over LIBOR 1.0500% over LIBOR    
Interest rate risk [member] | U.S. Dollar Debts [Member] | Floating interest rate [member] | Later than five years [member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt     70  
Borrowings, interest rate basis 1.0500% over LIBOR —    
Interest rate risk [member] | U.S. Dollar Debts [Member] | Fair Value [Member] | Floating interest rate [member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt ₱ 12,222 ₱ 16,123 $ 255 $ 317
Borrowings, interest rate basis — —    
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt | ₱ ₱ 457 ₱ 408    
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Borrowings, interest rate basis — —    
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt | ₱ ₱ 1,262 ₱ 491    
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | Floating interest rate [member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt | ₱ ₱ 101 ₱ 36    
Borrowings, interest rate basis — —    
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | U S Dollar Notes | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt | ₱ ₱ 634      
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | U.S. Dollar Debts [Member] | Floating interest rate [member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt | ₱ ₱ 69 ₱ 47    
Borrowings, interest rate basis — —    
Interest rate risk [member] | Costs [Member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt | ₱ ₱ 540 ₱ 952    
Interest rate risk [member] | Costs [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt | ₱ ₱ 161,040 ₱ 156,588    
Interest rate risk [member] | Costs [Member] | Philippine Peso [Member] | Bottom of range [member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Borrowings, interest rate basis — —    
Interest rate risk [member] | Costs [Member] | Debt Instruments at Amortized Cost [Member] | U.S. Dollars [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱ ₱ 1,153      
Interest rate risk [member] | Costs [Member] | Debt Instruments at Amortized Cost [Member] | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱   ₱ 150    
Interest rate risk [member] | Costs [Member] | Cash In Bank | U.S. Dollars [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱ 2,337 1,586    
Interest rate risk [member] | Costs [Member] | Cash In Bank | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱ 4,940 4,228    
Interest rate risk [member] | Costs [Member] | Cash In Bank | Other Currencies        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱   92    
Interest rate risk [member] | Costs [Member] | Temporary Cash Investments | U.S. Dollars [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱ 12,222 3,645    
Interest rate risk [member] | Costs [Member] | Temporary Cash Investments | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱ 18,490 14,018    
Interest rate risk [member] | Costs [Member] | Short Term Investments1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱ 40,131 24,033    
Interest rate risk [member] | Costs [Member] | Short Term Investments1 | U.S. Dollars [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱ 480      
Interest rate risk [member] | Costs [Member] | Short Term Investments1 | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱ 509 29    
Interest rate risk [member] | Costs [Member] | Short Term Investments1 | Other Currencies        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱   285    
Interest rate risk [member] | Costs [Member] | Total Assets Excluding Short Term Investments [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt | ₱ 222,665 192,556    
Interest rate risk [member] | Costs [Member] | Floating interest rate [member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt | ₱ ₱ 20,754 ₱ 18,939    
Borrowings, interest rate basis — —    
Interest rate risk [member] | Costs [Member] | U S Dollar Notes | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt | ₱ ₱ 28,179      
Interest rate risk [member] | Costs [Member] | U.S. Dollar Debts [Member] | Floating interest rate [member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Long-term Debt | ₱ ₱ 12,153 ₱ 16,077    
Borrowings, interest rate basis — —