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Deferred Credits and Other Noncurrent Liabilities - Summary of Changes to Asset Retirement Obligations (Detail) - PHP (₱) ₱ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Subclassifications Of Assets Liabilities And Equities [Abstract] |  |
Provision for asset retirement obligations at beginning of the year | ₱ 1,630 | ₱ 1,582
Additional liability recognized during the year | 161 | 82
Accretion expenses | 47 | 39
Settlement of obligations and others | (182) | (73)
Provision for asset retirement obligations at end of the year | ₱ 1,656 | ₱ 1,630

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