Cash Flow Information - Non-cash Investing Activities (Detail) $ in Millions, $ in Millions	12 Months Ended
Dec. 31, 2024 TWD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 TWD ($)	Dec. 31, 2022 TWD ($)
Noncash Investing Activities [Abstract]
Additions of property, plant and equipment	$ 28,576		$ 30,398	$ 31,265
Changes in other payables	180		343	270
Payments for acquisition of property, plant and equipment	28,756	$ 877	30,741	31,535
Proceeds from disposal of financial assets at fair value through other comprehensive income	$ 0	$ 0	$ 0	$ 0

The cash outflow for the purchases of property, plant and equipment, classified as investing activities. [Refer: Property, plant and equipment]

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 7
-IssueDate 2024-01-01
-Paragraph 16
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_16_a&doctype=Standard
-URIDate 2024-03-27

Name:	ifrs-full_PurchaseOfPropertyPlantAndEquipmentClassifiedAsInvestingActivities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration