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Financial Assets and Liabilities at Fair Value through Profit or Loss (Tables) | 12 Months Ended
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Dec. 31, 2017
Summary of Financial Assets and Liabilities at Fair Value through Profit or Loss |
|  | December 31, 2016 |  |  | December 31, 2017 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Financial assets |  |  |  |  |  |  |  |
Held for trading |  |  |  |  |  |  |  |
Forward exchange contracts |  | $ | 142.4 |  |  | $ | 569.8 |
Cross currency swap contracts |  |  | 11.0 |  |  |  | — |
|  |  | 153.4 |  |  |  | 569.8 |
Designated as at FVTPL |  |  |  |  |  |  |  |
Time deposit |  |  | 6,297.7 |  |  |  | — |
|  | $ | 6,451.1 |  |  | $ | 569.8 |
Financial liabilities |  |  |  |  |  |  |  |
Held for trading |  |  |  |  |  |  |  |
Forward exchange contracts |  | $ | 91.6 |  |  | $ | 26.7 |
Designated as at FVTPL |  |  |  |  |  |  |  |
Forward exchange contracts |  |  | 99.5 |  |  |  | — |
|  | $ | 191.1 |  |  | $ | 26.7 |
Forward exchange contracts [member] |
Outstanding Derivative Contracts for which Hedge Accounting Treatment is not Applied | Outstanding forward exchange contracts consisted of the following:
|  |  |  | Contract Amount
|  | Maturity Date |  | (In Millions)
December 31, 2016 |  |  |  |
Sell NT$/Buy EUR |  | January 2017 |  | NT$5,393.3/EUR159.4
Sell NT$/Buy JPY |  | January 2017 |  | NT$7,314.8/JPY26,501.8
Sell US$/Buy EUR |  | January 2017 |  | US$4.2/EUR4.0
Sell US$/Buy JPY |  | January 2017 |  | US$0.4/JPY50.0
Sell US$/Buy NT$ |  | January 2017 to February 2017 |  | US$439.0/NT$14,138.2
Sell US$/Buy RMB |  | January 2017 to June 2017 |  | US$421.8/RMB2,908.4
December 31, 2017 |  |  |  |
Sell NT$/Buy EUR |  | January 2018 to February 2018 |  | NT$6,002.8/EUR169.0
Sell NT$/Buy JPY |  | February 2018 |  | NT$996.3/JPY3,800.0
Sell US$/Buy JPY |  | January 2018 |  | US$2.2/JPY246.7
Sell US$/Buy RMB |  | January 2018 |  | US$558.0/RMB3,679.6
Sell US$/Buy NT$ |  | January 2018 to February 2018 |  | US$1,661.5/NT$49,673.3
Sell RMB /Buy EUR |  | January 2018 |  | RMB39.0/EUR5.0
Sell RMB/Buy JPY |  | January 2018 |  | RMB409.7/JPY7,062.5
Sell RMB/Buy GBP |  | January 2018 |  | RMB3.6/GBP0.4
Cross currency swap contracts [member] |
Outstanding Derivative Contracts for which Hedge Accounting Treatment is not Applied | Outstanding cross currency swap contracts consisted of the following:
Maturity Date |  | Contract Amount (In Millions) |  |  | Range of Interest Rates Paid |  |  | Range of Interest Rates Received |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |
January 2017 |  |  | US$170.0/ NT$5,487.6 |  |  |  | 3.98% |  |  |  | — |

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