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Retirement Benefit Plans - Fair Value of Plan Assets by Major Categories (Detail) - TWD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Disclosure of fair value of plan assets [abstract]
Cash	$ 1,351.8	$ 1,337.9
Equity instruments	4,998.9	4,696.9
Debt instruments	2,387.2	2,128.1
Fair value of plan assets	$ 8,737.9	$ 8,162.9

X

- Definition

The amount cash and cash equivalents contribute to the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [member]]

+ References

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X

- Definition

The amount instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

+ References

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No definition available.

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- Definition

The amount instruments representing equity (rather than debt) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]]

+ References

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-Name IAS
-Number 19
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- Definition

The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

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