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Income Taxes - Summary of Provision for (Benefit from) Income Tax (Detail) - PHP (₱)
₱ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Major Components Of Tax Expense Income [Abstract]      
Current ₱ 3,841 ₱ 6,043 ₱ 9,273
Deferred (2,738) (4,134) (4,710)
Actual provision for (benefit from) corporate income tax ₱ 1,103 ₱ 1,909 ₱ 4,563