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Investments Accounted for Using Equity Method - Market Prices of Investments Accounted for Using Equity Method in Publicly Traded Stocks Calculated by Closing Price at End of Reporting Period (Detail) - Level 1 [member] - TWD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Vanguard International Semiconductor Corporation [member]
Disclosure of associates [line items]
Closing Price in Active Markets	$ 35,977.3	$ 73,347.3
Global Unichip Corporation [member]
Disclosure of associates [line items]
Closing Price in Active Markets	29,926.9	27,359.1
Xintec Inc. [member]
Disclosure of associates [line items]
Closing Price in Active Markets	$ 10,716.4	$ 15,913.3

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- Definition

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

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- Definition

The fair value of investments in associates if there are quoted market prices for the investment. [Refer: Associates [member]; Investments in associates reported in separate financial statements]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2022-03-24
-Paragraph 21
-Subparagraph b
-Clause iii
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-URIDate 2022-03-24

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