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Financial Assets and Liabilities - Summary of Derivative Financial Instruments (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2019
PHP (₱)
USD ($)
EUR (€)
Dec. 31, 2018
PHP (₱)
Disclosure of detailed information about financial instruments [Line Items]    
Weighted Average Foreign Exchange Rate 1.00  
Mark-to-market loss/gain ₱ 11,000,000 ₱ 129,000,000
Accrued interest income 2,000,000 17,000,000
Fair value recognized 0 0
Transactions Designated As Hedges    
Disclosure of detailed information about financial instruments [Line Items]    
Net Mark-to-market Gains (Losses) (71,000,000) 243,000,000
Long Term Currency Swaps | Transactions Designated As Hedges    
Disclosure of detailed information about financial instruments [Line Items]    
Interest accrual 2,000,000 16,000,000
Hedge cost portion of the movements in the fair value 1,000,000 2,000,000
Net Mark-to-market Gains (Losses) (12,000,000) 50,000,000
Long Term Currency Swaps | Transactions Designated As Hedges | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Mark-to-market loss/gain 23,000,000 45,000,000
Interest accrual 7,000,000 3,000,000
Hedge cost portion of the movements in the fair value 2,000,000 1,000,000
Interest rate swap contract [member] | Transactions Designated As Hedges    
Disclosure of detailed information about financial instruments [Line Items]    
Interest accrual 3,000,000 18,000,000
Hedge cost portion of the movements in the fair value 0 0
Net Mark-to-market Gains (Losses) ₱ 6,000,000 ₱ 63,000,000
E U R Assets | Weighted average [member] | Foreign Exchange Contracts    
Disclosure of detailed information about financial instruments [Line Items]    
Weighted Average Foreign Exchange Rate | € 1.185  
Exchange rate, description no  
Termination Date Various Dates In November Two Thousand Eighteen And December Two Thousand And Eighteen | E U R Assets | Various Dates In Two Thousand And Eighteen [Member] | Weighted average [member] | Foreign Exchange Contracts    
Disclosure of detailed information about financial instruments [Line Items]    
Weighted Average Foreign Exchange Rate | € 1.161  
Termination Date Various Dates In Two Thousand Eighteen | US Dollar Liabilities [Member] | Various Dates In Two Thousand Seventeen And Two Thousand Eighteen | Foreign Exchange Contracts | Transactions Not Designated As Hedges [Member] | PLDT [Member]    
Disclosure of detailed information about financial instruments [Line Items]    
Weighted Average Foreign Exchange Rate 50.64  
Termination Date Various Dates In Two Thousand Eighteen | US Dollar Liabilities [Member] | Various Dates In Two Thousand Seventeen And Two Thousand Eighteen | Weighted average [member] | Foreign Exchange Contracts | Condition Three    
Disclosure of detailed information about financial instruments [Line Items]    
Weighted Average Foreign Exchange Rate 51.58  
Termination Date Various Dates In Two Thousand Eighteen | US Dollar Liabilities [Member] | Various Dates In Two Thousand Seventeen And Two Thousand Eighteen | Weighted average [member] | Foreign Exchange Contracts | Condition One    
Disclosure of detailed information about financial instruments [Line Items]    
Exchange rate, description 52.48  
Termination Date Various Dates In Two Thousand Eighteen | US Dollar Liabilities [Member] | Various Dates In Two Thousand Seventeen And Two Thousand Eighteen | Weighted average [member] | Foreign Exchange Contracts | Condition Two    
Disclosure of detailed information about financial instruments [Line Items]    
Weighted Average Foreign Exchange Rate 52.48