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Share-based Payment Arrangement - CHIEF's Summary of Compensation Costs for Stock Options (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Compensation costs	$ 19.0	$ 0	$ 8.0	$ 2.0
CHIEF Telecom Inc. (CHIEF) [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Compensation costs	10.0		1.8	1.5
CHIEF Telecom Inc. (CHIEF) [Member] | Granted on October 22, 2015 [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Compensation costs	0.0		0.0	0.3
CHIEF Telecom Inc. (CHIEF) [Member] | Granted on December 19, 2017 [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Compensation costs	0.1		0.2	0.6
CHIEF Telecom Inc. (CHIEF) [Member] | Granted on October 31, 2018 [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Compensation costs	0.2		0.3	0.6
CHIEF Telecom Inc. (CHIEF) [Member] | Granted on November 13, 2020 [Member]
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Compensation costs	$ 9.7		$ 1.3	$ 0.0

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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.

+ References

No definition available.

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- Definition

The amount of expense from share-based payment transactions with employees. [Refer: Expense from share-based payment transactions]

+ References

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