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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, 2021 TWD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 TWD ($) | Dec. 31, 2019 TWD ($) | Dec. 31, 2021 USD ($)
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness | $ (41.4) | $ (1.5) | $ 24.1 | $ (109.6) |
Cash flow hedges [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness | (41.4) |  | 24.1 | (109.6) |
Cash flow hedges [member] | Forecast Transaction Capital Expenditures [member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness | 41.4 |  | $ (24.1) | $ 109.6 |
Cash flow hedges [member] | Forecast Transaction Relates To Issuance of Debts [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness | (132.5) |  |  |  |
Cash flow hedges [member] | Forward interest rate contracts |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Maturity |  |  | January 2022 |  |
Cash flow hedges [member] | Forward interest rate contracts | 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 | Forecast Transaction Relates To Issuance of Debts [Member] |  |  |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |  |  |
Increase (Decrease) in Value Used for Calculating Hedge Ineffectiveness | $ 132.5 |  |  |  |

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