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Financial Assets and Liabilities at Fair Value through Profit or Loss - Outstanding Forward Exchange Contracts for which Hedge Accounting Treatment is not Applied (Detail) ¥ in Millions, $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 JPY (¥)
Sell NT$ | Bottom of range [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Maturity Date | 2021-01 | 2020-01 |  |  |
Sell NT$ | Top of range [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Maturity Date | 2021-03 | 2020-06 |  |  |
Sell NT$ | Sell [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Contract Amount | $ 144,698.0 | $ 108,428.0 |  |  |
Sell JPY | Bottom of range [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Maturity Date |  | 2020-01 |  |  |
Sell JPY | Top of range [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Maturity Date |  | 2020-02 |  |  |
Sell JPY | Sell [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Contract Amount | ¥ |  |  |  |  | ¥ 57,471.6
Sell US$ | Bottom of range [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Maturity Date | 2021-01 | 2020-01 |  |  |
Sell US$ | Top of range [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Maturity Date | 2021-03 | 2020-03 |  |  |
Sell US$ | Sell [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Contract Amount |  |  | $ 1,176.9 | $ 529.2 |

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