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Financial Assets and Liabilities - Summary of Maximum Exposure to Credit Risk (Detail) - PHP (₱)
₱ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure ₱ 63,110 ₱ 95,231
Collateral and Other Credit Enhancements 561 516
Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 63,671 95,747
Cash and Cash Equivalent [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 24,185 51,467
Collateral and Other Credit Enhancements 184 187
Cash and Cash Equivalent [member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 24,369 51,654
Financial instruments at amortized cost [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 25,729 27,492
Collateral and Other Credit Enhancements 377 329
Financial instruments at amortized cost [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 26,106 27,821
Financial instruments at amortized cost [Member] | Other financial assets [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 3,206 2,450
Financial instruments at amortized cost [Member] | Other financial assets [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 3,206 2,450
Financial instruments at amortized cost [Member] | Debt Instruments at Amortized Cost [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 150 150
Financial instruments at amortized cost [Member] | Debt Instruments at Amortized Cost [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 150 150
Financial instruments at amortized cost [Member] | Short Term Investments1    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 314 1,165
Financial instruments at amortized cost [Member] | Short Term Investments1 | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 314 1,165
Financial instruments at amortized cost [Member] | Retail subscribers [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 6,440 9,565
Collateral and Other Credit Enhancements 46 55
Financial instruments at amortized cost [Member] | Retail subscribers [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 6,486 9,620
Financial instruments at amortized cost [Member] | Corporate subscribers [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 8,072 6,291
Collateral and Other Credit Enhancements 331 273
Financial instruments at amortized cost [Member] | Corporate subscribers [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 8,403 6,564
Financial instruments at amortized cost [Member] | Foreign administrations [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 1,519 3,306
Financial instruments at amortized cost [Member] | Foreign administrations [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 1,519 3,306
Financial instruments at amortized cost [Member] | Domestic carriers [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 799 193
Financial instruments at amortized cost [Member] | Domestic carriers [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 799 193
Financial instruments at amortized cost [Member] | Dealers agents and others [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 5,229 4,372
Collateral and Other Credit Enhancements   1
Financial instruments at amortized cost [Member] | Dealers agents and others [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 5,229 4,373
Financial instruments at FVPL [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 10,277 11,919
Financial instruments at FVPL [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 10,277 11,919
Financial instruments at FVPL [Member] | Other financial assets [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 6,866 6,833
Financial instruments at FVPL [Member] | Other financial assets [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 6,866 6,833
Financial instruments at FVPL [Member] | Financial assets at FVPL [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 3,369 4,763
Financial instruments at FVPL [Member] | Financial assets at FVPL [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 3,369 4,763
Financial instruments at FVPL [Member] | Interest rate swap contract [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 31 227
Financial instruments at FVPL [Member] | Interest rate swap contract [member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 31 227
Financial instruments at FVPL [Member] | Forward Foreign Exchange Contracts [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 8  
Financial instruments at FVPL [Member] | Forward Foreign Exchange Contracts [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 8  
Financial instruments at FVPL [Member] | Long-term currency swap [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 1 83
Financial instruments at FVPL [Member] | Long-term currency swap [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 1 83
Financial instruments at FVPL [Member] | Currency Swap Contract [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 2 13
Financial instruments at FVPL [Member] | Currency Swap Contract [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 2 13
Financial instruments at FVOCI [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 2,919 4,353
Financial instruments at FVOCI [Member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 2,919 4,353
Financial instruments at FVOCI [Member] | Financial instruments at FVOCI [member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure 2,919 4,353
Financial instruments at FVOCI [Member] | Financial instruments at FVOCI [member] | Costs [Member]    
Disclosure Of Credit Risk Exposure [Line Items]    
Maximum Exposure ₱ 2,919 ₱ 4,353