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Hedging Derivative Financial Instruments (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Detailed Information About Hedging Instruments [Abstract] |
Summary of Hedging Derivative Financial Instruments |
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Hedging derivative financial liabilities |  |  |  |  |  |  |  |
Cash flow hedge - forward exchange contracts |  | $ | 1 |  |  | $ | 1 |
Outstanding Forward Exchange Contracts | The outstanding forward exchange contracts at the balance sheet dates were as follows:
|  | Currency |  | Maturity Period |  | Contract Amount (Millions)
December 31, 2016 |  |  |  |  |  |
Forward exchange contracts - buy |  | EUR/NT$ |  | 2017.03 |  | EUR3/NT$102
December 31, 2017 |  |  |  |  |  |
Forward exchange contracts - buy |  | EUR/NT$ |  | 2018.03-06 |  | EUR4/NT$142
Loss (Gain) Arising from Hedging Derivative Financial Instruments that have been Reclassified from Equity to Initial Cost of the Property, Plant and Equipment | Loss (gain) arising from the hedging derivative financial instruments that have been reclassified from equity to initial cost of the property, plant and equipment were as follows:
|  | Year Ended December 31 |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  |  |  | (In Millions) |  |  |  |  |
Construction in progress and equipment to be accepted |  | $ | (18 | ) |  | $ | (15 | ) |  | $ | (2 | )

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- Definition The disclosure of detailed information about hedging instruments. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2016-01-13 -Paragraph 24A -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_24A&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The disclosure of information about the terms and conditions of hedging instruments and how they affect future cash flows. [Refer: Hedging instruments [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2016-01-13 -Paragraph 23A -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2016-03-30&anchor=para_23A&doctype=Standard -URIDate 2016-03-31 + Details
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- Definition The disclosure of the reclassification of financial instruments. [Refer: Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_10_e&doctype=Standard -URIDate 2016-03-31 + Details
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