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Inventories and Supplies - Summary of Changes in Allowance for Inventory Obsolescence and Write-down (Detail) - PHP (₱) ₱ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Classes Of Inventories [Abstract] |  |  |
Balances at beginning of the year | ₱ 2,303 | ₱ 3,212 |
Provisions (Note 5) | 934 | 471 | ₱ 1,528
Translation revaluation | (1) |  |
Write-off | (56) | (136) |
Reclassification | (209) | (220) |
Cost of sales | (262) | (495) |
Reversals | (346) | (529) |
Balances at end of the year | ₱ 2,363 | ₱ 2,303 | ₱ 3,212

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- Definition The amount of expense recognised related to the write-down of inventories to net realisable value. [Refer: Inventories] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2020-01-01 -Paragraph 36 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=2&code=ifrs-tx-2020-en-r&anchor=para_36_e&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_98_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount recognised as a reduction in the amount of inventories recognised as an expense due to the reversal of any write-down of inventories resulting from an increase in net realisable value. [Refer: Inventories; Inventory write-down] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 2 -IssueDate 2020-01-01 -Paragraph 36 -Subparagraph f -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=2&code=ifrs-tx-2020-en-r&anchor=para_36_f&doctype=Standard -URIDate 2020-01-01 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 98 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_98_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Allowance for inventory obsolescence for the year. + References No definition available. + Details
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- Definition Inventory obsolescence write-off. + References No definition available. + Details
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- Definition Inventory write down cost of sales. + References No definition available. + Details
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- Definition Reclassification of inventory write down. + References No definition available. + Details
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- Definition Translation revaluation. + References No definition available. + Details
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