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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) $ in Millions, $ in Millions	Dec. 31, 2024 TWD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 TWD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 TWD ($)	Dec. 31, 2021 TWD ($)
Disclosure of financial assets [abstract]
Cash and deposits in banks	$ 2,120,674.8		$ 1,453,101.6
Money market funds	2,826.7		10,898.7
Repurchase agreements	2,127.0		1,346.7
Commercial paper	1,998.5		30.0
Government bonds/Agency bonds	0.0		50.8
Cash and cash equivalents	$ 2,127,627.0	$ 64,886.5	$ 1,465,427.8	$ 44,691.3	$ 1,342,814.1	$ 1,064,990.2

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

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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

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- Definition

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

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