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Financial Assets at Fair Value through Other Comprehensive Income Noncurrent - Additional Information (Detail) - TWD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of financial assets [Line Items]
Unrealized losses on financial assets at FVOCI			$ (0.1)
Dividends received	$ 240.0	$ 167.0	157.0
Outstanding Investments [Member]
Disclosure of financial assets [Line Items]
Dividends received	$ 239.0	$ 167.0	157.0
UUPON Inc. (UUPON) [Member]
Disclosure of financial assets [Line Items]
Fair value amount			$ 0.2

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- Definition

Noncurrent financial assets at fair value through other comprehensive income.

+ References

No definition available.

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- Definition

The amount of dividends received.

+ References

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-IssueDate 2024-01-01
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- Definition

The amount investment funds contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [domain]; Investment funds [member]]

+ References

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- Definition

The amount of other comprehensive income, net of tax, related to gains (losses) from changes in the fair value of investments in equity instruments that the entity has designated at fair value through other comprehensive income applying paragraph 5.7.5 of IFRS 9. [Refer: Other comprehensive income]

+ References

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