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Short Term Loans - Summary of Short-term Loans (Detail) - Short-term loans [Member] - TWD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Disclosure of detailed information about borrowings [Line Items]
Unsecured loans	$ 100	$ 70
Unsecured loans [Member] | Bottom of Range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rates of loans	1.35%	2.15%
Unsecured loans [Member] | Top of Range [Member]
Disclosure of detailed information about borrowings [Line Items]
Interest rates of loans	2.35%	2.19%

X

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 7
-IssueDate 2018-01-01
-Paragraph 7
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-URIDate 2018-03-16

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

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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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-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2018-03-16

+ Details

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- Details

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