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Short Term Loans - Summary of Short-term Loans (Detail) $ in Millions, $ in Millions	Dec. 31, 2017 TWD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 TWD ($)
Disclosure of detailed information about borrowings [Line Items]
Total	$ 70	$ 2	$ 138
Short-term loans [Member]
Disclosure of detailed information about borrowings [Line Items]
Secured loans	0		20
Unsecured loans	$ 70		$ 118
Short-term loans [Member] | Secured loans [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rates of loans	0.00%	0.00%	1.98%
Short-term loans [Member] | Unsecured loans [Member] | Minimum [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rates of loans	2.15%	2.15%	1.95%
Short-term loans [Member] | Unsecured loans [Member] | Top of range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rates of loans	2.19%	2.19%	2.25%

X

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2016-01-13
-Paragraph 7
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-URIDate 2016-03-31

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- Definition

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+ References

No definition available.

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- Definition

The amount of loans received from banks that have been secured by collateral. [Refer: Loans received]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 1
-IssueDate 2016-01-13
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- Definition

The amount of current borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2016-01-13
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-URIDate 2016-03-31

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X

- Definition

The amount of loans received from banks that have not been secured by collateral. [Refer: Loans received]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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