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Hedging Derivative Financial Instruments | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Detailed Information About Hedging Instruments [Abstract] |
Hedging Derivative Financial Instruments | 21.HEDGING DERIVATIVE FINANCIAL INSTRUMENTS
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Hedging derivative financial liabilities |  |  |  |  |  |  |  |
Cash flow hedge - forward exchange contracts |  | $ | 1 |  |  | $ | 1 |
Chunghwa’s hedge strategy is to enter forward exchange contracts - buy to avoid its foreign currency exposure to certain foreign currency denominated equipment payments in the following six months. In addition, Chunghwa’s management considers the market condition to determine the hedge ratio, and enters into forward exchange contracts with the banks to avoid the foreign currency risk. Chunghwa signed equipment purchase contracts with suppliers, and entered into forward exchange contracts to avoid foreign currency risk exposure to Euro-denominated purchase commitments. Those forward exchange contracts were designated as cash flow hedges. For the years ended December 31, 2015, 2016 and 2017, gain (loss) arising from changes in fair value of the hedged items recognized in other comprehensive income was gain of $1 million, loss of $1 million and loss of $1 million, respectively. Upon the completion of the purchase transaction, the amount deferred and recognized in equity initially will be reclassified into equipment as its carrying value. As of December 31, 2015, 2016 and 2017, Chunghwa expected part of the equipment purchase transactions will not occur and reclassified the related loss of $1 million, gain of $1 million and gain of $2 million, respectively, arising from the forward exchange contracts of the aforementioned transactions from equity to profit or loss. The outstanding forward exchange contracts at the balance sheet dates were as follows:
|  | Currency |  | Maturity Period |  | Contract Amount (Millions)
December 31, 2016 |  |  |  |  |  |
Forward exchange contracts - buy |  | EUR/NT$ |  | 2017.03 |  | EUR3/NT$102
December 31, 2017 |  |  |  |  |  |
Forward exchange contracts - buy |  | EUR/NT$ |  | 2018.03-06 |  | EUR4/NT$142
Loss (gain) arising from the hedging derivative financial instruments that have been reclassified from equity to initial cost of the property, plant and equipment were as follows:
|  | Year Ended December 31 |
|  | 2015 |  |  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  |  |  |  |  | (In Millions) |  |  |  |  |
Construction in progress and equipment to be accepted |  | $ | (18 | ) |  | $ | (15 | ) |  | $ | (2 | )

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- Definition The disclosure of derivative financial instruments. [Refer: Derivatives [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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