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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) - TWD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Sell NT$ [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Maturity Date |  | 2024-01
Sell NT$ [Member] | Sell [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Contract Amount |  | $ 26,251.8
Sell US$ [Member] | Bottom of range [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Maturity Date | 2025-01 | 2024-01
Sell US$ [Member] | Top of range [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Maturity Date | 2025-03 | 2024-03
Sell US$ [Member] | Sell [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Contract Amount | $ 3,331.4 | $ 1,112.0
Sell JPY [Member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Maturity Date | 2025-01 | 2024-01
Sell JPY [Member] | Sell [member] |  |
Disclosure of detailed information about financial instruments [line items] |  |
Contract Amount | $ 45,234.0 | $ 20,000.0

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