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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] |  |  |
Gain (loss) arising from changes in fair value of the hedged items recognized in other comprehensive income | $ (1) | $ (1) | $ 1
Reclassification of gain (loss) arising from forward exchange contracts | $ 2 | $ 1 | $ (1)

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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 -Note Effective 2018-01-01 -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 91 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_91_a&doctype=Standard -URIDate 2016-03-31 + 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 -Note Effective 2018-01-01 -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 92 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_92&doctype=Standard -URIDate 2016-03-31 + Details
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