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Hedging Derivative Financial Instruments - Additional Information (Detail) - TWD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Detailed Information About Hedging Instruments [Abstract] |  |  |
Gains (losses) on change in value of forward elements of forward contracts, net of tax | $ 1 | $ 1 |
Reclassification of gain (loss) arising from forward exchange contracts | $ 2 | $ 1 | $ (1)

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- References No definition available. + Details
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- Definition The gains (losses) recognised in other comprehensive income on change in value of forward elements of forward contracts, net of tax. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_91_a&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition The amount of reclassification adjustments related to change in value of forward elements of forward contracts, net of tax. Reclassification adjustments are amounts reclassified to profit (loss) in the current period that were recognised in other comprehensive income in the current or previous periods. [Refer: Other comprehensive income] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 92 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_92&doctype=Standard -URIDate 2018-03-16 + Details
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