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Financial Assets and Liabilities - Summary of Derivative Financial Instruments by Classification (Detail) - PHP (₱)
₱ in Millions
Dec. 31, 2019
Dec. 31, 2018
Reconciliation Of Fair Value Of Credit Derivative [Abstract]    
Noncurrent assets ₱ 1 ₱ 140
Current assets 41 183
Noncurrent liabilities (Note 29) (25)  
Current liabilities (Note 29) (88) (80)
Net assets (liabilities) ₱ (71)  
Net assets (liabilities)   ₱ 243