Inventories and Supplies - Summary of Cost of Inventories and Supplies Recognized as Expense (Detail) - PHP (₱) ₱ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Classes of current inventories [abstract]
Cost of sales	₱ 9,904	₱ 11,912	₱ 11,287
Repairs and maintenance	407	734	986
Provisions	196	89	408
Selling and promotions			4
Inventories and supplies recognized as expense	₱ 10,507	₱ 12,735	₱ 12,685

The amount of expense recognised related to the write-down of inventories to net realisable value. [Refer: Inventories]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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