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Long Term Loans - Summary of Long-term Loans (Detail) $ in Millions, $ in Millions	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)
Disclosure of detailed information about borrowings [Line Items]
Less: Current portion	$ 0	$ 0	$ (1,600)
Non-current portion of non-current borrowings	1,600	$ 58	0
Long-term loans [Member]
Disclosure of detailed information about borrowings [Line Items]
Secured loans	1,600		1,600
Less: Current portion	0		(1,600)
Non-current portion of non-current borrowings	$ 1,600		$ 0
Long-term loans [Member] | Secured loans [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rates of loans	0.89%	0.89%	0.72%

X

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2021-01-01
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-URIDate 2021-03-24

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X

- Definition

The current portion of non-current borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2021-01-01
-Paragraph 55
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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.

+ Details

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- Definition

The non-current portion of non-current borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 1
-IssueDate 2021-01-01
-Paragraph 55
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-URIDate 2021-03-24

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X

- Definition

The amount of loans received from banks that have been secured by collateral. [Refer: Loans received]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2021-01-01
-Paragraph 112
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+ Details

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X

- Details

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Period Type:

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- Details

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