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Financial Assets at Amortized Cost - Schedule of Financial Assets at Amortized Cost (Detail) $ in Millions, $ in Millions	Jun. 30, 2021 TWD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Jun. 30, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Disclosure of financial assets [line items]
Less: Allowance for impairment loss	$ (291.1)		$ (246.6)	$ (340.2)	$ (325.3)
Corporate bonds	4,336.6		10,970.2
Current portion			6,598.0
Noncurrent portion	4,336.6	$ 155.4	4,372.2
Corporate bonds [member]
Disclosure of financial assets [line items]
Less: Allowance for impairment loss	(2.2)		(7.1)
Corporate bonds	$ 4,338.8		$ 10,977.3

X

- Definition

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
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- Definition

The amount of debt instruments held by the entity that were issued by a corporate entity. [Refer: Debt instruments held]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2020-01-01
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- Definition

The amount of current financial assets measured at amortised cost. [Refer: Financial assets at amortised cost]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 8
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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The amount of non-current financial assets measured at amortised cost. [Refer: Financial assets at amortised cost]

+ References

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