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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
Dec. 31, 2024
Dec. 31, 2023
Subclassifications of assets, liabilities and equities [abstract]    
Provision for asset retirement obligations at beginning of the year ₱ 1,164 ₱ 1,514
Revaluation due to change in IBR 515 (175)
Capitalized to ROU assets during the year 73 163
Accretion expenses 54 63
Reclassification to liabilities associated with assets classified as held-for-sale   (369)
Settlement of obligations and others (3) (2)
Change in assumptions (51) (30)
Provision for asset retirement obligations at end of the year ₱ 1,752 ₱ 1,164