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Financial Assets and Liabilities - Summary of Derivative Financial Instruments by Classification (Detail) - PHP (₱)
₱ in Millions
Dec. 31, 2021
Dec. 31, 2020
Reconciliation Of Fair Value Of Credit Derivative [Abstract]    
Noncurrent assets ₱ 48  
Current assets 93 ₱ 22
Noncurrent liabilities (Note 29) (100) (360)
Current liabilities (Note 29) (115) (176)
Net liabilities ₱ (74) ₱ (514)