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v3.19.1

Financial Assets and Liabilities at Fair Value through Profit or Loss (Tables) | 12 Months Ended
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Dec. 31, 2018
Statement [LineItems] |
Summary of Financial Assets and Liabilities at Fair Value through Profit or Loss |
|  | December 31, 2017 |  |  | December 31, 2018 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Financial assets |  |  |  |  |  |  |  |
Mandatorily measured at FVTPL |  |  |  |  |  |  |  |
Agency mortgage-backed securities |  | $ | — |  |  | $ | 3,419.3 |
Forward exchange contracts |  |  | — |  |  |  | 85.3 |
|  |  | — |  |  |  | 3,504.6 |
Held for trading |  |  |  |  |  |  |  |
Forward exchange contracts |  |  | 569.8 |  |  |  | — |
|  | $ | 569.8 |  |  | $ | 3,504.6 |
Financial liabilities |  |  |  |  |  |  |  |
Held for trading |  |  |  |  |  |  |  |
Forward exchange contracts |  | $ | 26.7 |  |  | $ | 40.8 |
Forward exchange contracts [member] |
Statement [LineItems] |
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, 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$49,673.3
Sell RMB /Buy EUR |  | January 2018 |  | RMB39.0/EUR5.0
Sell RMB/Buy JPY |  | January 2018 |  | RMB409.7/JPY7,062.5
Sell RMB/Buy GBP |  | January 2018 |  | RMB3.6/GBP0.4
December 31, 2018 |  |  |  |
Sell NT$/Buy EUR |  | January 2019 to March 2019 |  | NT$18,545.9/EUR527.0
Sell NT$/Buy JPY |  | January 2019 to March 2019 |  | NT$4,757.9/JPY17,200.0
Sell US$/Buy EUR |  | January 2019 |  | US$0.5/EUR0.4
Sell US$/Buy JPY |  | January 2019 |  | US$175.6/JPY19,389.0
Sell US$/Buy RMB |  | January 2019 |  | US$318.0/RMB2,188.7
Sell US$/Buy NT$ |  | January 2019 to February 2019 |  | US$127.0/NT$3,908.6
Sell RMB/Buy US$ |  | January 2019 |  | RMB667.5/ US$97.0

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