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Long-Term Bank Loans - Summary of Loans and Bonds Payable (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2021
TWD ($)
Dec. 31, 2020
TWD ($)
Dec. 31, 2021
USD ($)
Disclosure of detailed information about borrowings [line items]      
Less: Current portion $ (4,400.0) $ (2,600.0)  
Long-term bank loans 3,309.1 1,967.6 $ 119.3
Long-term bank loans [member]      
Disclosure of detailed information about borrowings [line items]      
Unsecured loans 3,510.0 2,000.0  
Less: Discounts on government grants (34.2) (32.4)  
Less: Current portion (166.7)    
Long-term bank loans $ 3,309.1 $ 1,967.6  
Annual interest rate   0.40%  
Maturity date September 2026 September 2025  
Long-term bank loans [member] | Bottom of range [member]      
Disclosure of detailed information about borrowings [line items]      
Annual interest rate 0.40%   0.40%
Long-term bank loans [member] | Top of range [member]      
Disclosure of detailed information about borrowings [line items]      
Annual interest rate 0.90%   0.90%