v3.26.1
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, 2025
PHP (₱)
Dec. 31, 2024
PHP (₱)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱ ₱ 49,418 ₱ 47,627    
Total liabilities | ₱ 479,419 473,478    
Fair Value [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱ 1,233 1,131    
Total liabilities | ₱ 2 22    
Costs [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱ 68,585 65,102    
Interest rate risk [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets ₱ 8,281 8,076 $ 141 $ 139
Total liabilities   283,575 5,050 4,902
Borrowings, interest rate basis 30      
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 ₱ 370 395 6 7
Interest rate risk [member] | Cash In Bank | U.S. Dollars [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 1,177 785 20 14
Interest rate risk [member] | Cash In Bank | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 5,355 5,296 91 91
Interest rate risk [member] | Temporary Cash Investments | U.S. Dollars [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 584 395 10 7
Interest rate risk [member] | Temporary Cash Investments | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 785 1,069 14 18
Interest rate risk [member] | Short Term Investments1 | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets 10 ₱ 136   2
Interest rate risk [member] | Total Assets Excluding Short Term Investments [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities | ₱ ₱ 296,939      
Interest rate risk [member] | Less than 1 year [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets     135 133
Total liabilities     $ 208 339
Interest rate risk [member] | Less than 1 year [Member] | Philippine Peso [Member] | Bottom of range [member] | Short-term Debt        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate 6.0249%   6.0249%  
Interest rate risk [member] | Less than 1 year [Member] | Philippine Peso [Member] | Top of range [member] | Short-term Debt        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate 6.079%   6.079%  
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       $ 1
Interest rate 6.25% 4.25% 6.25% 4.25%
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     $ 20 $ 14
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% 0.05% 0.01% 0.05%
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% 0.50% 0.50% 0.50%
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     $ 91 $ 91
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% 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 4.50% 5.10% 4.50% 5.10%
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     $ 10 $ 7
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 3.61% 4.50% 3.61% 4.50%
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 3.90% 5.25% 3.90% 5.25%
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     $ 14 $ 18
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 0.25% 0.25% 0.25% 0.25%
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 6.00% 6.00% 6.00% 6.00%
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       $ 2
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 2.00% 6.00% 2.00% 6.00%
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 6.00% 6.10% 6.00% 6.10%
Interest rate risk [member] | 1-2 years [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets     $ 6  
Total liabilities     368 $ 346
Interest rate risk [member] | 1-2 years [Member] | Debt Instruments at Amortized Cost [Member] | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets     $ 6  
Interest rate   6.25%   6.25%
Interest rate risk [member] | 1-2 years [Member] | Debt Instruments at Amortized Cost [Member] | Philippine Peso [Member] | Bottom of range [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate 4.625%   4.625%  
Interest rate risk [member] | 1-2 years [Member] | Debt Instruments at Amortized Cost [Member] | Philippine Peso [Member] | Top of range [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate 4.875%   4.875%  
Interest rate risk [member] | 2-3 years [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets       $ 6
Total liabilities     $ 548 475
Interest rate risk [member] | 2-3 years [Member] | Debt Instruments at Amortized Cost [Member] | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets       $ 6
Interest rate risk [member] | 2-3 years [Member] | Debt Instruments at Amortized Cost [Member] | Philippine Peso [Member] | Bottom of range [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate   4.625%   4.625%
Interest rate risk [member] | 2-3 years [Member] | Debt Instruments at Amortized Cost [Member] | Philippine Peso [Member] | Top of range [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate   4.875%   4.875%
Interest rate risk [member] | 3-5 years [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities     $ 879 $ 822
Interest rate risk [member] | 3-5 years [Member] | Debt Instruments at Amortized Cost [Member] | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate 6.50% 6.50% 6.50% 6.50%
Interest rate risk [member] | Later than five years [member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities     $ 3,047 $ 2,920
Interest rate risk [member] | Fixed Rate [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]        
Interest rate 4.65% 4.00% 4.65% 4.00%
Interest rate risk [member] | Fixed Rate [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]        
Interest rate 5.35% 4.65% 5.35% 4.65%
Interest rate risk [member] | Fixed Rate [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]        
Interest rate 4.00% 4.00% 4.00% 4.00%
Interest rate risk [member] | Fixed Rate [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]        
Interest rate 5.20% 5.35% 5.20% 5.35%
Interest rate risk [member] | Fixed Rate [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]        
Interest rate 4.00% 4.00% 4.00% 4.00%
Interest rate risk [member] | Fixed Rate [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]        
Interest rate 5.20% 5.20% 5.20% 5.20%
Interest rate risk [member] | Fixed Rate [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]        
Interest rate 4.00% 4.00% 4.00% 4.00%
Interest rate risk [member] | Fixed Rate [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]        
Interest rate 5.156% 5.20% 5.156% 5.20%
Interest rate risk [member] | Fixed Rate [Member] | Later than five years [member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Interest rate 4.00%   4.00%  
Interest rate risk [member] | Fixed Rate [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]        
Interest rate   4.00%   4.00%
Interest rate risk [member] | Fixed Rate [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]        
Interest rate   5.088%   5.088%
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]        
Borrowings, interest rate basis   BVAL + 1.0000%    
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]        
Borrowings, interest rate basis   0.5000% to 1.0000% over PHP BVAL (floor rate 4.5000% to 4.6250%)    
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]        
Borrowings, interest rate basis   0.5000% to 1.0000% over PHP BVAL (floor rate 4.5000% to 4.6250%)    
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]        
Borrowings, interest rate basis   0.5000% to 0.9000% over PHP BVAL (floor rate 4.5000% to 4.6250%)    
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]        
Borrowings, interest rate basis   0.5000% to 0.7500% over PHP BVAL (floor rate 4.5000%)    
Interest rate risk [member] | Fair Value [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets ₱ 8,280 ₱ 8,069 $ 141 $ 139
Total liabilities 288,191 269,912 4,901 4,665
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 369 388 6 7
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 1,177 785 20 14
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 5,355 5,296 91 91
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 584 395 10 7
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 785 1,069 $ 14 18
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 ₱ 10 136   2
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]        
Interest rate 2.50%   2.50%  
Interest rate risk [member] | U S Dollar Notes | Fixed Rate [Member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities   ₱ 34,708 $ 600 600
Interest rate risk [member] | U S Dollar Notes | Fixed Rate [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities | ₱ ₱ 35,274      
Interest rate risk [member] | U S Dollar Notes | Fixed 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]        
Total liabilities     $ 600 $ 600
Interest rate risk [member] | U S Dollar Notes | Fixed Rate [Member] | 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]        
Interest rate   2.50%   2.50%
Interest rate risk [member] | U S Dollar Notes | Fixed Rate [Member] | 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]        
Interest rate 3.45% 3.45% 3.45% 3.45%
Interest rate risk [member] | U S Dollar Notes | Fair Value [Member] | Fixed Rate [Member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities ₱ 28,819 ₱ 26,811 $ 490 $ 463
Interest rate risk [member] | U S Dollar Debts | Floating Interest Rate [Member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities 4,115 ₱ 4,860 70 84
Interest rate risk [member] | U S Dollar Debts | 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]        
Total liabilities ₱ 28     28
Borrowings, interest rate basis SOFR+ 1.31161% SOFR+ 1.31161%    
Interest rate risk [member] | U S Dollar Debts | 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]        
Total liabilities ₱ 28     14
Borrowings, interest rate basis SOFR+ 1.31161% SOFR+ 1.31161%    
Interest rate risk [member] | U S Dollar Debts | 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]        
Total liabilities ₱ 14     28
Borrowings, interest rate basis SOFR+ 1.31161% SOFR+ 1.31161%    
Interest rate risk [member] | U S Dollar Debts | 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]        
Total liabilities       14
Borrowings, interest rate basis SOFR+ 1.31161% SOFR+ 1.31161%    
Interest rate risk [member] | U S Dollar Debts | 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]        
Total liabilities ₱ 4,115 ₱ 4,859 70 84
Interest rate risk [member] | Philippine Peso Debt | U.S. Dollars [Member] | Short-term Debt        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities | ₱ 300      
Interest rate risk [member] | Philippine Peso Debt | Philippine Peso [Member] | Short-term Debt        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities     5  
Interest rate risk [member] | Philippine Peso Debt | Less than 1 year [Member] | Philippine Peso [Member] | Short-term Debt        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities     5  
Interest rate risk [member] | Philippine Peso Debt | Fixed Rate [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities 62,345 81,315 1,060 1,406
Interest rate risk [member] | Philippine Peso Debt | Fixed Rate [Member] | Less than 1 year [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities     203 315
Interest rate risk [member] | Philippine Peso Debt | Fixed Rate [Member] | 1-2 years [Member] | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities       231
Interest rate risk [member] | Philippine Peso Debt | Fixed Rate [Member] | 1-2 years [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities     344  
Interest rate risk [member] | Philippine Peso Debt | Fixed Rate [Member] | 2-3 years [Member] | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities       339
Interest rate risk [member] | Philippine Peso Debt | Fixed Rate [Member] | 2-3 years [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities     198  
Interest rate risk [member] | Philippine Peso Debt | Fixed Rate [Member] | 3-5 years [Member] | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities       316
Interest rate risk [member] | Philippine Peso Debt | Fixed Rate [Member] | 3-5 years [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities     238  
Interest rate risk [member] | Philippine Peso Debt | Fixed Rate [Member] | Later than five years [member] | Philippine Peso [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities       205
Interest rate risk [member] | Philippine Peso Debt | Fixed Rate [Member] | Later than five years [member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities     77  
Interest rate risk [member] | Philippine Peso Debt | Floating Interest Rate [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities ₱ 194,905 162,692 3,315 2,812
Interest rate risk [member] | Philippine Peso Debt | 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]        
Total liabilities       24
Interest rate risk [member] | Philippine Peso Debt | 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]        
Total liabilities     176 87
Borrowings, interest rate basis PHP BVAL + 0.4000% to 0.7500%      
Interest rate risk [member] | Philippine Peso Debt | 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]        
Total liabilities     142 122
Borrowings, interest rate basis PHP BVAL + 0.4000% to 0.7500%      
Interest rate risk [member] | Philippine Peso Debt | 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]        
Total liabilities     627 478
Borrowings, interest rate basis PHP BVAL + 0.4000% to 0.7500%      
Interest rate risk [member] | Philippine Peso Debt | 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]        
Total liabilities     2,370 2,101
Borrowings, interest rate basis PHP BVAL + 0.4000% to 0.7500%      
Interest rate risk [member] | Philippine Peso Debt | Fair Value [Member] | U.S. Dollars [Member] | Short-term Debt        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities ₱ 300   5  
Interest rate risk [member] | Philippine Peso Debt | Fair Value [Member] | Fixed Rate [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities 60,052 75,550 1,021 1,306
Interest rate risk [member] | Philippine Peso Debt | Fair Value [Member] | Floating Interest Rate [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities 194,905 162,692 $ 3,315 $ 2,812
Interest rate risk [member] | Debt Issuance ​Cost [​Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities | ₱   1,989    
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | Total Assets Excluding Short Term Investments [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities | ₱ 1,891      
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | U S Dollar Notes | Fixed Rate [Member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities | ₱ 495 531    
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | U S Dollar Debts | Floating Interest Rate [Member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities | ₱ 15 22    
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | Philippine Peso Debt | Fixed Rate [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities | ₱ 423 581    
Interest rate risk [member] | Debt Issuance ​Cost [​Member] | Philippine Peso Debt | Floating Interest Rate [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities | ₱ 958 855    
Interest rate risk [member] | Costs [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total assets | ₱ 8,281 8,076    
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 | ₱ 370 395    
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 | ₱ 1,177 785    
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 | ₱ 5,355 5,296    
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 | ₱ 584 395    
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 | ₱ 785 1,069    
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 | ₱ 10 136    
Interest rate risk [member] | Carrying Value [Member]        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities | ₱ 295,048 281,586    
Interest rate risk [member] | Carrying Value [Member] | U S Dollar Notes | Fixed Rate [Member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities | ₱ 34,779 34,177    
Interest rate risk [member] | Carrying Value [Member] | U S Dollar Debts | Floating Interest Rate [Member] | U.S. Dollars [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities | ₱ 4,100 4,838    
Interest rate risk [member] | Carrying Value [Member] | Philippine Peso Debt | U.S. Dollars [Member] | Short-term Debt        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities | ₱ 300      
Interest rate risk [member] | Carrying Value [Member] | Philippine Peso Debt | Fixed Rate [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities | ₱ 61,922 80,734    
Interest rate risk [member] | Carrying Value [Member] | Philippine Peso Debt | Floating Interest Rate [Member] | Philippine Peso [Member] | Long Term Debt1        
Disclosure Of Risk Management Strategy Related To Hedge Accounting [Line Items]        
Total liabilities | ₱ ₱ 193,947 ₱ 161,837