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Hedging Financial Instruments - Summary of Information Relating to Hedges for Foreign Currency Risk (Detail) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 TWD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 TWD ($) | Dec. 31, 2022 TWD ($) | Dec. 31, 2023 JPY (¥)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Change in Value Used for Calculating Hedged Ineffectiveness | $ 5,000,000 | $ 0.1 | $ 39,900,000 | $ 0 |
Bank loans [member] | Hedges of net investments in foreign operations [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Contract Amount | ¥ |  |  |  |  | ¥ 124,500
Annual Interest Rate |  |  | 0.00% |  |
Maturity |  |  | April 2024 |  |
Balance in Other Equity (Continuing Hedges) |  |  | $ 618.2 |  |
Change in Value Used for Calculating Hedged Ineffectiveness | 793,800,000 |  | 618.2 |  |
Forward exchange contracts [member] | Cash flow hedges [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Change in Value Used for Calculating Hedged Ineffectiveness | 5,000,000 |  | 39,900,000 |  |
Forward interest rate contracts [member] | Cash flow hedges [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Change in Value Used for Calculating Hedged Ineffectiveness |  |  |  | 1,379,100,000 |
Forecast Transaction Capital Expenditures [member] | Cash flow hedges [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Change in Value Used for Calculating Hedged Ineffectiveness | (5,000,000) |  | (39,900,000) |  |
Forecast Transaction Relates To Issuance of Debts [Member] | Cash flow hedges [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Change in Value Used for Calculating Hedged Ineffectiveness |  |  |  | $ (1,379,100,000) |
Net investments in foreign operations [member] | Hedges of net investments in foreign operations [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Change in Value Used for Calculating Hedged Ineffectiveness | $ (793,800,000) |  | $ (618.2) |  |

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- Definition The gain (loss) recognised in other comprehensive income on hedge ineffectiveness. [Refer: Gain (loss) on hedge ineffectiveness] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24C -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24C_a_i&doctype=Standard -URIDate 2024-03-27 + Details
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