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Financial Assets and Liabilities - Summary of Impact of Hedging Instruments (Detail)
₱ in Millions
 12 Months Ended
Dec. 31, 2019
PHP (₱)
USD ($)
Dec. 31, 2018
PHP (₱)
USD ($)
Foreign currency exchange risk [Member] | Derivative Financial Liabilities – Net of Current Portion [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Carrying Amount ₱ (24)  
Line item in our Consolidated Statements of Financial Position Derivative financial liabilities – net of current portion  
Foreign currency exchange risk [Member] | Current Portion of Derivative Financial Liabilities [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Carrying Amount ₱ (24)  
Line item in our Consolidated Statements of Financial Position Current portion of derivative financial liabilities  
Foreign currency exchange risk [Member] | Current Portion of Derivative Financial Assets [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Carrying Amount ₱ 3 ₱ 13
Line item in our Consolidated Statements of Financial Position Current portion of derivative financial assets Current portion of derivative financial assets
Foreign currency exchange risk [Member] | Long Term Currency Swaps | Derivative Financial Assets – Net of Current Portion [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Notional Amount | $ 37 46
Carrying Amount ₱ 1 ₱ 83
Line item in our Consolidated Statements of Financial Position Derivative financial assets – net of current portion Derivative financial assets – net of current portion
Interest rate risk [member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Notional Amount | $ 233,000,000 323,000,000
Carrying Amount   ₱ 227
Interest rate risk [member] | Interest Rate Swap1    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Notional Amount | $ 233,000,000 323,000,000
Carrying Amount ₱ 1 ₱ 57
Line item in our Consolidated Statements of Financial Position Derivative financial assets – net of current portion Derivative financial assets – net of current portion
Interest rate risk [member] | Current Portion of Derivative Financial Assets [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Carrying Amount ₱ 31 ₱ 170
Line item in our Consolidated Statements of Financial Position Current portion of derivative financial assets Current portion of derivative financial assets
Interest rate risk [member] | Derivative Financial Liabilities – Net of Current Portion [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Carrying Amount ₱ (1)  
Line item in our Consolidated Statements of Financial Position Derivative financial liabilities – net of current portion  
Interest rate risk [member] | Current Portion of Derivative Financial Liabilities [Member]    
Disclosure Of Information About Terms And Conditions Of Hedging Instruments And How They Affect Future Cash Flows [Line Items]    
Carrying Amount ₱ (31)  
Line item in our Consolidated Statements of Financial Position Current portion of derivative financial liabilities