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Hedging Financial Instruments - Summary of Information Relating to Hedges for Foreign Currency Risk (Detail) $ in Millions, $ in Millions	6 Months Ended
	Jun. 30, 2021 TWD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 TWD ($)
Disclosure of detailed information about financial instruments [line items]
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness	$ (41.4)	$ (1.5)	$ (42.8)
Cash flow hedges [member] | Forecast Transaction Capital Expenditures [member]
Disclosure of detailed information about financial instruments [line items]
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness	41.4		42.8
Cash flow hedges [member] | Forward exchange contracts [member]
Disclosure of detailed information about financial instruments [line items]
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness	$ (41.4)		$ (42.8)

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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.

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No definition available.

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- Definition

The gain (loss) recognised in other comprehensive income on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2020-01-01
-Paragraph 24C
-Subparagraph a
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-URIDate 2020-01-01

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