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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