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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) $ in Millions, $ in Millions	Dec. 31, 2019 TWD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 TWD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 TWD ($)	Dec. 31, 2016 TWD ($)
Disclosure of financial assets [abstract]
Cash and deposits in banks	$ 452,734.4		$ 575,825.5
Government bonds	2,188.1
Commercial paper	476.8		759.5
Repurchase agreements collateralized by corporate bonds			1,229.6
Cash and cash equivalents	$ 455,399.3	$ 15,225.7	$ 577,814.6	$ 19,318.4	$ 553,391.7	$ 541,253.8

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

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