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Financial Assets and Liabilities at Fair Value through Profit or Loss - Outstanding Forward Exchange Contracts for which Hedge Accounting Treatment is not Applied (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Sell NT$ [Member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date		2024-01
Sell NT$ [Member] | Sell [member]
Disclosure of detailed information about financial instruments [line items]
Contract Amount		$ 26,251.8
Sell US$ [Member] | Bottom of range [member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date	2025-01	2024-01
Sell US$ [Member] | Top of range [member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date	2025-03	2024-03
Sell US$ [Member] | Sell [member]
Disclosure of detailed information about financial instruments [line items]
Contract Amount	$ 3,331.4	$ 1,112.0
Sell JPY [Member]
Disclosure of detailed information about financial instruments [line items]
Maturity Date	2025-01	2024-01
Sell JPY [Member] | Sell [member]
Disclosure of detailed information about financial instruments [line items]
Contract Amount	$ 45,234.0	$ 20,000.0

X

- Definition

The amount of contractual undiscounted cash flows in relation to contractual amounts to be exchanged in a derivative financial instrument for which gross cash flows are exchanged. [Refer: Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph B11D
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_B11D_d&doctype=Appendix&subtype=B
-URIDate 2024-03-27

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X

- 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.

+ References

No definition available.

+ Details

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X

- Definition

Derivative maturity date month and year.

+ References

No definition available.

+ Details

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- Details

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- Details

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