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Hedging Derivative Financial Instruments - Summary of Hedging Derivative Financial Instruments (Detail) - Cash flow hedges [Member] - TWD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Disclosure of detailed information about hedging instruments [Line Items]
Cash flow hedge-forward exchange contracts, financial liabilities	$ 1	$ 1
Forward exchange contracts [Member]
Disclosure of detailed information about hedging instruments [Line Items]
Cash flow hedge-forward exchange contracts, financial liabilities	$ 1	$ 1

X

- Definition

The amount of financial liabilities classified as derivative instruments. [Refer: Financial assets; Derivatives [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2016-01-13
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_55&doctype=Standard
-URIDate 2016-03-31

+ Details

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Balance Type:	credit
Period Type:	instant

X

- 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.

+ Details

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- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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Namespace Prefix:
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