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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) $ in Millions, $ in Millions	Dec. 31, 2017 TWD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 TWD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 TWD ($)	Dec. 31, 2014 TWD ($)
Disclosure of financial assets [abstract]
Cash and deposits in banks	$ 551,919.8		$ 536,895.3
Agency bonds	776.0
Commercial paper	695.9		1,997.2
Repurchase agreements collateralized by corporate bonds			2,361.3
Cash and cash equivalents	$ 553,391.7	$ 18,670.4	$ 541,253.8	$ 18,260.9	$ 562,688.9	$ 358,449.0

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

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

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

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- Definition

Agency bonds.

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No definition available.

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