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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) $ in Millions, $ in Millions	Jun. 30, 2021 TWD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2020 TWD ($)	Dec. 31, 2019 TWD ($)
Disclosure of financial assets [abstract]
Cash and deposits in banks	$ 745,313.2		$ 653,580.6
Government bonds	2,668.9		3,716.1
Repurchase agreements			1,750.4
Commercial paper			1,123.5
Cash and cash equivalents	$ 747,982.1	$ 26,799.8	$ 660,170.6	$ 23,653.6	$ 467,613.4	$ 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

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

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