Segment Information - Additional Information (Detail) $ in Millions, $ in Millions	12 Months Ended
Dec. 31, 2024 TWD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 TWD ($)
Disclosure Of Operating Segments [Line Items]
Long-lived assets	$ 421,329	$ 12,850	$ 420,537
Information about major customers	Company did not have any single customer whose revenue exceeded 10% of the total revenues.
Overseas [Member]
Disclosure Of Operating Segments [Line Items]
Long-lived assets	$ 2,948		$ 3,093

The amount of assets that do not meet the definition of current assets. [Refer: Current assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2024-01-01
-Paragraph B12
-Subparagraph b
-Clause ii
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-URIDate 2024-03-27

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 12
-IssueDate 2024-01-01
-Paragraph B10
-Subparagraph b
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-URIDate 2024-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 66
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_66&doctype=Standard
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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant