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Share-Based Payment Arrangements - Summary of Granted 2021 RSAs (Detail) shares in Millions	12 Months Ended
	Dec. 31, 2023 TWD ($) shares
2021 Restricted Stock Award [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Balance, beginning of year	1.4
Issuance of stocks	0.0
Vested shares	(0.3)
Canceled shares	(0.4)
Balance, end of year	0.7
Weighted-average fair value of RSAs | $	$ 325.81
2022 Restricted Stock Award [Member]
Disclosure of terms and conditions of share-based payment arrangement [line items]
Balance, beginning of year	0.0
Issuance of stocks	2.1
Balance, end of year	2.1
Weighted-average fair value of RSAs | $	$ 277.71

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- Definition

The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

+ References

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The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement.

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The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement.

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The weighted average fair value at the measurement date of granted equity instruments other than share options. [Refer: Weighted average [member]]

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