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Hedging Derivative Financial Instruments - Summary of Hedging Derivative Financial Instruments (Detail) - Cash flow hedges [member] - TWD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure Of Detailed Information About Hedging Instruments [Line Items] |  |
Cash flow hedge-forward exchange contracts, financial liabilities | $ 0 | $ 1
Forward exchange contracts [Member] |  |
Disclosure Of Detailed Information About Hedging Instruments [Line Items] |  |
Cash flow hedge-forward exchange contracts, financial liabilities |  | $ 1

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- 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 2018-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard -URIDate 2018-03-16 + Details
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Balance Type: | credit
Period Type: | instant

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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. + Details
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- Details
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Data Type: | na
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- Details
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