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Financial Instruments at Fair Value Through Profit or Loss - Outstanding Forward Exchange Contracts Not Designated for Hedge (Detail) - Forward exchange contracts [Member] € in Millions, $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2021 EUR (€)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)
EUR [Member]
Disclosure of detailed information about financial instruments [Line Items]
Currency	NT$/EUR	NT$/EUR
Maturity Period	2022.03	2021.03
Contract Amount	$ 257	$ 50	€ 8		€ 2
Taiwan, New Dollars
Disclosure of detailed information about financial instruments [Line Items]
Currency		US$/NT$
Maturity Period		2021.02-03
Contract Amount		$ 379		$ 14

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+ References

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- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2021-01-01
-Paragraph 112
-Subparagraph c
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