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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) $ in Millions, $ in Millions	Dec. 31, 2018 TWD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 TWD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 TWD ($)	Dec. 31, 2015 TWD ($)
Disclosure of financial assets [abstract]
Cash and deposits in banks	$ 575,825.5		$ 551,919.8
Repurchase agreements collateralized by corporate bonds	1,229.6
Commercial paper	759.5		695.9
Agency bonds			776.0
Cash and cash equivalents	$ 577,814.6	$ 18,876.7	$ 553,391.7	$ 18,078.8	$ 541,253.8	$ 562,688.9

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

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

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Agency bonds.

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