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Deferred Credits and Other Noncurrent Liabilities - Summary of Changes to Provision for Asset Retirement Obligations (Detail) - PHP (₱) ₱ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Subclassifications Of Assets Liabilities And Equities [Abstract] |  |
Provision for asset retirement obligations at beginning of the year | ₱ 1,656 | ₱ 1,630
Additional liability | 154 | 161
Accretion expenses | 82 | 47
Settlement of obligations and others | (125) | (182)
Provision for asset retirement obligations at end of the year | ₱ 1,767 | ₱ 1,656

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