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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, 2020
Statement [LineItems] |
Summary of Financial Assets and Liabilities at Fair Value through Profit or Loss |
|  | December 31, 2019 |  |  | December 31, 2020 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Financial assets |  |  |  |  |  |  |  |
Mandatorily measured at FVTPL |  |  |  |  |  |  |  |
Forward exchange contracts |  | $ | 162.1 |  |  | $ | 2,259.4 |
Convertible bonds |  |  | 123.8 |  |  |  | — |
Agency mortgage-backed securities |  |  | 40.9 |  |  |  | — |
|  | $ | 326.8 |  |  | $ | 2,259.4 |
Financial liabilities |  |  |  |  |  |  |  |
Held for trading |  |  |  |  |  |  |  |
Forward exchange contracts |  | $ | 982.3 |  |  | $ | 94.1 |
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, 2019 |  |  |  |  |  |
Sell NT$ |  | January 2020 to June 2020 |  |  | NT$108,428.0 |
Sell JPY |  | January 2020 to February 2020 |  |  | JPY57,471.6 |
Sell US$ |  | January 2020 to March 2020 |  |  | US$529.2 |
December 31, 2020 |  |  |  |  |  |
Sell NT$ |  | January 2021 to March 2021 |  |  | NT$144,698.0 |
Sell US$ |  | January 2021 to March 2021 |  |  | US$1,176.9 |

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