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Financial Assets and Liabilities - Summary of Maximum Exposure to Credit Risk (Detail) - PHP (₱)
₱ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure ₱ 58,675 ₱ 74,561
Collateral and Other Credit Enhancements* 513 528
Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 59,188 75,089
Financial assets at amortised cost, category [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 51,084 66,538
Collateral and Other Credit Enhancements* 513 528
Financial assets at amortised cost, category [member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 51,597 67,066
Financial assets at amortised cost, category [member] | Other Financial Assets [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 3,307 3,115
Financial assets at amortised cost, category [member] | Other Financial Assets [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 3,307 3,115
Financial assets at amortised cost, category [member] | Debt Instruments at Amortized Cost [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 607 1,153
Financial assets at amortised cost, category [member] | Debt Instruments at Amortized Cost [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 607 1,153
Financial assets at amortised cost, category [member] | Cash and Cash Equivalent [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 23,780 40,064
Collateral and Other Credit Enhancements* 127 173
Financial assets at amortised cost, category [member] | Cash and Cash Equivalent [member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 23,907 40,237
Financial assets at amortised cost, category [member] | Short Term Investments1    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 1,986 508
Financial assets at amortised cost, category [member] | Short Term Investments1 | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 1,986 508
Financial assets at amortised cost, category [member] | Corporate subscribers [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 7,992 8,123
Collateral and Other Credit Enhancements* 379 337
Financial assets at amortised cost, category [member] | Corporate subscribers [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 8,371 8,460
Financial assets at amortised cost, category [member] | Retail subscribers [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 7,630 7,134
Collateral and Other Credit Enhancements* 7 18
Financial assets at amortised cost, category [member] | Retail subscribers [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 7,637 7,152
Financial assets at amortised cost, category [member] | Foreign administrations [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 1,220 1,284
Financial assets at amortised cost, category [member] | Foreign administrations [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 1,220 1,284
Financial assets at amortised cost, category [member] | Domestic carriers [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 227 165
Financial assets at amortised cost, category [member] | Domestic carriers [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 227 165
Financial assets at amortised cost, category [member] | Dealers agents and others [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 4,335 4,992
Financial assets at amortised cost, category [member] | Dealers agents and others [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 4,335 4,992
financial assets at FVPL [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 7,591 7,855
financial assets at FVPL [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 7,591 7,855
financial assets at FVPL [Member] | Other Financial Assets [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 6,856 6,972
financial assets at FVPL [Member] | Other Financial Assets [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 6,856 6,972
financial assets at FVPL [Member] | Short Term Investments1    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 255 481
financial assets at FVPL [Member] | Short Term Investments1 | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 255 481
financial assets at FVPL [Member] | Financial Assets at FVPL    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 339 380
financial assets at FVPL [Member] | Financial Assets at FVPL | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 339 380
financial assets at FVPL [Member] | Interest Rate Swap Contract [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 93 22
financial assets at FVPL [Member] | Interest Rate Swap Contract [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 93 22
financial assets at FVPL [Member] | Long Term Currency Swap Contract    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 48  
financial assets at FVPL [Member] | Long Term Currency Swap Contract | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure ₱ 48  
Fair value changes of financial instrument at FVOCI [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure   168
Fair value changes of financial instrument at FVOCI [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure   168
Fair value changes of financial instrument at FVOCI [Member] | Financial Instruments at FVOCI [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure   168
Fair value changes of financial instrument at FVOCI [Member] | Financial Instruments at FVOCI [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure   ₱ 168