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Financial Assets and Liabilities - Summary of Analysis of Gains (Losses) on Derivative Financial Instruments (Detail) - PHP (₱) ₱ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Net Gain Losses On Derivative Financial Instruments [Abstract] |  |  |
Gains on derivative financial instruments (Note 4) | ₱ 1,135 | ₱ 724 | ₱ 1,539
Hedge costs | (49) | (191) | (543)
Net gains on derivative financial instruments (Notes 4 and 5) | ₱ 1,086 | ₱ 533 | ₱ 996

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