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Income Taxes - Summary of Provision for Income Tax (Detail) - PHP (₱) ₱ in Millions | 12 Months Ended
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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

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