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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, 2019
Statement [LineItems] |
Summary of Financial Assets and Liabilities at Fair Value through Profit or Loss |
|  | December 31, 2018 |  |  | December 31, 2019 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Financial asset s |  |  |  |  |  |  |  |
Mandatorily measured at FVTPL |  |  |  |  |  |  |  |
Forward exchange contracts |  | $ | 85.3 |  |  | $ | 162.1 |
Convertible bonds |  |  | — |  |  |  | 123.8 |
Agency mortgage-backed securities |  |  | 3,419.3 |  |  |  | 40.9 |
|  | $ | 3,504.6 |  |  | $ | 326.8 |
Financial liabilities |  |  |  |  |  |  |  |
Held for trading |  |  |  |  |  |  |  |
Forward exchange contracts |  | $ | 40.8 |  |  | $ | 982.3 |
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:
|  | Maturity Date |  | Contract Amount (In Millions) |
December 31, 201 8 |  |  |  |  |  |
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$97.0 |
December 31, 2019 |  |  |  |  |  |
Sell NT$/Buy EUR |  | January 2020 to June 2020 |  |  | NT$84,690.4/EUR2,509.0 |
Sell NT$/Buy JPY |  | January 2020 to March 2020 |  |  | NT$23,737.6/JPY85,600.0 |
Sell US$/Buy JPY |  | January 2020 |  |  | US$6.2 /JPY678.0 |
Sell US$/Buy RMB |  | January 2020 |  |  | US$497.0/RMB3,493.9 |
Sell US$/Buy NT$ |  | January 2020 to March 2020 |  |  | US$26.0/NT$787.0 |
Sell JPY/Buy US$ |  | January 2020 to February 2020 |  |  | JPY57,471.6/US$526.4 |

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