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Financial Instruments at Fair Value Through Profit or Loss (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Financial Instruments [Abstract] |
Summary of Financial Instruments at Fair Value through Profit or Loss |
|  | December 31 |
|  | 2016 |  |  | 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |
Financial assets held for trading |  |  |  |  |  |  |  |
Derivatives (not designated for hedge) |  |  |  |  |  |  |  |
Forward exchange contracts |  | $ | — |  |  | $ | — |
Financial liabilities held for trading |  |  |  |  |  |  |  |
Derivatives (not designated for hedge) |  |  |  |  |  |  |  |
Forward exchange contracts |  | $ | 1 |  |  | $ | 1 |
Outstanding Forward Exchange Contracts Not Designated for Hedge | Outstanding forward exchange contracts not designated for hedge as of balance sheet dates were as follows:
|  |  |  | Maturity |  | Contract Amount
|  | Currency |  | Period |  | (In Millions)
December 31, 2016 |  |  |  |  |  |
Forward exchange contracts - buy |  | EUR/NT$ |  | 2017.03 |  | EUR5/NT$167
Forward exchange contracts - buy |  | US$/NT$ |  | 2017.01 |  | US$2/NT$55
December 31, 2017 |  |  |  |  |  |
Forward exchange contracts - buy |  | EUR/NT$ |  | 2018.03-06 |  | EUR2/NT$69
Forward exchange contracts - buy |  | US$/NT$ |  | 2018.01 |  | US$4/NT$125

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- Definition Disclosure of detailed information about financial instruments at fair value through profit or loss explanatory. + References No definition available. + Details
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