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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, 2021
Statement [LineItems] |
Summary of Financial Assets and Liabilities at Fair Value through Profit or Loss |
|  | December 31, 2020 |  |  | December 31, 2021 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Financial assets |  |  |  |  |  |  |  |
Mandatorily measured at FVTPL |  |  |  |  |  |  |  |
Forward exchange contracts |  | $ | 2,259.4 |  |  | $ | 159.0 |
Financial liabilities |  |  |  |  |  |  |  |
Held for trading |  |  |  |  |  |  |  |
Forward exchange contracts |  | $ | 94.1 |  |  | $ | 681.9 |
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, 2020 |  |  |  |
Sell NT$ |  | January 2021 to March 2021 |  | NT$144,698.0
Sell US$ |  | January 2021 to March 2021 |  | US$1,176.9
December 31, 2021 |  |  |  |
Sell NT$ |  | January 2022 to March 2022 |  | NT$132,734.5
Sell US$ |  | January 2022 to March 2022 |  | US$2,009.1

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