Financial Assets and Liabilities at Fair Value through Profit or Loss - Summary of Financial Assets and Liabilities at Fair Value through Profit or Loss (Detail) - TWD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Disclosure of detailed information about financial instruments [line items]
Financial assets, Mandatorily measured at FVTPL	$ 1,070.4	$ 159.0
Forward exchange contracts [member]
Disclosure of detailed information about financial instruments [line items]
Financial liabilities, Held for trading	116.2	681.9
Financial assets, Mandatorily measured at FVTPL	947.5	159.0
Convertible Bonds [Member]
Disclosure of detailed information about financial instruments [line items]
Financial assets, Mandatorily measured at FVTPL	$ 122.9	$ 0.0

The amount of financial liabilities at fair value through profit or loss that meet the definition of held for trading. A financial liability is classified as held for trading if: (a) it is acquired or incurred principally for the purpose of selling or repurchasing it in the near term; (b) on initial recognition it is part of a portfolio of identified financial instruments that are managed together and for which there is evidence of a recent actual pattern of short-term profit-taking; or (c) it is a derivative (except for a derivative that is a financial guarantee contract or a designated and effective hedging instrument). [Refer: Financial liabilities at fair value through profit or loss]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2022-03-24
-Paragraph 8
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_8_e&doctype=Standard
-URIDate 2022-03-24

Name:	ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant