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Income Taxes - Summary of Provision for Income Tax (Detail) - PHP (₱)
₱ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Major Components Of Tax Expense Income [Abstract]      
Current ₱ 2,467 ₱ 3,841 ₱ 6,043
Benefit from deferred income taxes 1,375 (2,738) (4,134)
Actual provision for corporate income tax ₱ 3,842 ₱ 1,103 ₱ 1,909