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Provisions - Summary of Provisions (Detail) $ in Millions, $ in Millions	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)	Dec. 31, 2018 TWD ($)
Provisions [Abstract]
Warranties	$ 213		$ 182
Onerous contracts	147		171
Employee benefits	63		57
Others	4		5
Provisions	427		415	$ 304	$ 207
Current	285	$ 10	314
Noncurrent	$ 142	$ 5	$ 101

X

- Definition

Provisions for onerous contracts.

+ References

No definition available.

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X

- Definition

The amount of current provisions, including provisions for employee benefits. [Refer: Provisions]

+ References

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X

- Definition

The amount of miscellaneous other provisions. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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X

- Definition

The amount of non-current provisions, including provisions for employee benefits. [Refer: Provisions]

+ References

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- Definition

The amount of liabilities of uncertain timing or amount, including provisions for employee benefits.

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No definition available.

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- Definition

The amount of provisions for employee benefits. [Refer: Employee benefits expense; Provisions]

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X

- Definition

The amount of provision for estimated costs of making good under warranties for products sold. [Refer: Provisions]

+ References

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