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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, 2021 | Dec. 31, 2020
Subclassifications Of Assets Liabilities And Equities [Abstract] |  |
Provision for asset retirement obligations at beginning of the year | ₱ 2,000 | ₱ 1,767
Capitalized to ROU assets during the year | 239 | 205
Accretion expenses | 65 | 61
Change in assumptions | (62) | (22)
Revaluation due to change in IBR | (102) | 39
Gain on settlement of asset retirement obligation |  | (50)
Settlement of obligations and others | (19) |
Provision for asset retirement obligations at end of the year | ₱ 2,121 | ₱ 2,000

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