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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, 2022 TWD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CNY (¥) | Dec. 31, 2021 USD ($)
Sell NT$ [Member] | Bottom of range [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Maturity Date | 2023-01 | 2022-01 |  |  |
Sell NT$ [Member] | Top of range [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Maturity Date | 2023-03 | 2022-03 |  |  |
Sell NT$ [Member] | Sell [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Contract Amount | $ 79,610.6 | $ 132,734.5 |  |  |
Sell US$ [Member] | Bottom of range [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Maturity Date | 2023-01 | 2022-01 |  |  |
Sell US$ [Member] | Top of range [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Maturity Date | 2023-03 | 2022-03 |  |  |
Sell US$ [Member] | Sell [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Contract Amount |  |  | $ 752.5 |  | $ 2,009.1
Sell RMB [Member] | Bottom of range [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Maturity Date | 2023-01 |  |  |  |
Sell RMB [Member] | Top of range [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Maturity Date | 2023-03 |  |  |  |
Sell RMB [Member] | Sell [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Contract Amount | ¥ |  |  |  | ¥ 1,448.4 |

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