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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) $ in Millions, $ in Millions	Dec. 31, 2022 TWD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 TWD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Disclosure of financial assets [abstract]
Cash and deposits in banks	$ 1,329,291.4		$ 1,058,808.1
Commercial paper	9,566.4		0.0
Government bonds	2,451.6		906.8
Repurchase agreements	1,133.3		5,275.3
Corporate bonds	371.4		0.0
Cash and cash equivalents	$ 1,342,814.1	$ 43,697.2	$ 1,064,990.2	$ 34,656.4	$ 660,170.6	$ 455,399.3

X

- Definition

A classification of cash equivalents representing banking arrangements that the entity does not separately disclose in the same statement or note. [Refer: Cash equivalents]

+ References

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

The amount of cash on hand and demand deposits. [Refer: Cash on hand]

+ References

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

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of debt instruments held by the entity that were issued by a government. [Refer: Debt instruments held; Government [member]]

+ References

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A classification of cash equivalents representing short-term investments. [Refer: Cash equivalents]

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Corporate bonds classified as cash equivalents.

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No definition available.

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