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Financial Assets at Amortized Cost - Schedule of Financial Assets at Amortized Cost (Detail) $ in Millions, $ in Millions	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2018 TWD ($)
Disclosure of financial assets [line items]
Less: Allowance for impairment loss	$ (246.6)		$ (325.3)	$ (7.3)
Corporate bonds	10,970.2		7,648.8
Current portion	6,598.0	$ 235.0	299.9
Noncurrent portion	4,372.2	$ 155.7	7,348.9
Corporate bonds [member]
Disclosure of financial assets [line items]
Less: Allowance for impairment loss	(7.1)		(2.9)
Corporate bonds	$ 10,977.3		$ 7,651.7

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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-IssueDate 2020-01-01
-Paragraph 16
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X

- 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
-Number 1
-IssueDate 2020-01-01
-Paragraph 112
-Subparagraph c
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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
-Subparagraph f
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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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-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 8
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-URIDate 2020-01-01

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