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Financial Assets And Liabilities - Summary of Effect of the Cash Flow Hedge in Consolidated Income Statements and Statements of Other Comprehensive Income (Detail) - Cash Flow Hedges [Member] - PHP (₱)
₱ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Foreign currency exchange risk [Member] | Long Term Currency Swaps    
Disclosure Of Hedge Accounting [Line Items]    
Total hedging loss recognized in OCI ₱ (366) ₱ (234)
Line item in our Consolidated Income Statements Other comprehensive loss Other comprehensive loss
Interest rate risk [member] | Interest Rate Swap1    
Disclosure Of Hedge Accounting [Line Items]    
Total hedging loss recognized in OCI ₱ (68) ₱ 179
Line item in our Consolidated Income Statements Other comprehensive loss Other comprehensive gain