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Hedging Financial Instruments - Summary of Information Relating to Hedges for Foreign Currency Risk (Detail) $ in Millions, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 TWD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 TWD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2021 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Change in Value Used for Calculating Hedged Ineffectiveness | $ 0.0 | $ 0.0 | $ (41.4) | $ 24.1 |
Cash flow hedges [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Change in Value Used for Calculating Hedged Ineffectiveness |  |  | (41.4) | 24.1 |
Cash flow hedges [member] | Forecast Transaction Capital Expenditures [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Change in Value Used for Calculating Hedged Ineffectiveness |  |  | 41.4 | $ (24.1) |
Cash flow hedges [member] | Forecast Transaction Relates To Issuance of Debts [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Change in Value Used for Calculating Hedged Ineffectiveness | (1,379.1) |  | $ (132.5) |  |
Cash flow hedges [member] | Forward interest rate contracts [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Maturity |  |  | January 2022 |  |
Cash flow hedges [member] | Forward interest rate contracts [member] | Interest rate risk [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Contract Amount |  |  |  |  | $ 328.0
Balance in Other Equity (Continuing Hedges) |  |  | $ 128.2 |  |
Cash flow hedges [member] | Forward interest rate contracts [member] | Forecast Transaction Relates To Issuance of Debts [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Change in Value Used for Calculating Hedged Ineffectiveness | $ 1,379.1 |  | $ 132.5 |  |

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