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Cash and Cash Equivalents - Additional Information (Detail) - PHP (₱) ₱ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash And Cash Equivalents [Abstract] |  |  |
Interest income earned from cash in banks and temporary cash investments | ₱ 560 | ₱ 1,022 | ₱ 957

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- Definition The amount of interest income on cash and cash equivalents. [Refer: Interest income; Cash and cash equivalents] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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