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Financial Instruments at Fair Value Through Profit or Loss - Outstanding Forward Exchange Contracts Not Designated for Hedge (Detail) € in Millions, $ in Millions, $ in Millions | 12 Months Ended |  |
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Dec. 31, 2024 TWD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2024 EUR (€) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 EUR (€)
Forward exchange contracts [Member] | EUR [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |
Currency |  | NT$/EUR |  |  |
Maturity Period |  | March 2024 |  |  |
Contract Amount | € |  |  |  |  | € 4.0
Forward exchange contracts [Member] | Taiwan, New Dollars |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |
Currency | NT$/USD |  |  |  |
Maturity Period | January 2025 |  |  |  |
Contract Amount | $ 46 | $ 145 |  |  |
Forward exchange contracts [Member] | USD [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |
Contract Amount |  |  |  | $ 1 |
Forward exchange contracts one [Member] | EUR [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |
Currency | NT$/EUR |  |  |  |
Maturity Period | March 2025 |  |  |  |
Contract Amount | € |  |  | € 0.3 |  |
Forward exchange contracts one [Member] | Taiwan, New Dollars |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |
Contract Amount | $ 10 |  |  |  |

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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 112 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard -URIDate 2024-03-27 + Details
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