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Long-Term Bank Loans - Summary of Loans and Bonds Payable (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)	Dec. 31, 2022 USD ($)
Disclosure of detailed information about borrowings [line items]
Less: Current portion	$ (18,100.0)	$ (4,400.0)
Long-term bank loans	4,760.0	3,309.1	$ 154.9
Long-term bank loans [member]
Disclosure of detailed information about borrowings [line items]
Unsecured loans	6,013.3	3,510.0
Less: Discounts on government grants	(39.4)	(34.2)
Less: Current portion	(1,213.9)	(166.7)
Long-term bank loans	$ 4,760.0	$ 3,309.1
Maturity date	December 2027	September 2026
Long-term bank loans [member] | Bottom of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rate	1.03%	0.40%	1.03%
Long-term bank loans [member] | Top of range [member]
Disclosure of detailed information about borrowings [line items]
Annual interest rate	1.23%	0.90%	1.23%

X

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2022-03-24
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- Definition

The maturity of borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2022-03-24
-Paragraph 7
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- Definition

The amount of current bonds issued and the current portion of non-current bonds issued. [Refer: Bonds issued]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 1
-IssueDate 2022-03-24
-Paragraph 112
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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

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2022-03-24
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- Definition

The nominal or face amount of a financial instrument, used to calculate payments made on that instrument.

+ References

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- Definition

Discounts on government grants.

+ References

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