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Long-Term Bank Loans - Summary of Loans and Bonds Payable (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
TWD ($)
Dec. 31, 2023
TWD ($)
Dec. 31, 2024
USD ($)
Disclosure of detailed information about borrowings [line items]      
Less: Current portion $ (57,148.0) $ (6,997.7)  
Long-term bank loans 31,824.4 4,383.0 $ 970.5
Long-term bank loans [member]      
Disclosure of detailed information about borrowings [line items]      
Less: Discounts on government grants (1.3) (27.8)  
Less: Current portion (2,709.9) (2,295.6)  
Long-term bank loans $ 31,824.4 $ 4,383.0  
Maturity date Due by December 2030 Due by December 2027  
Long-term bank loans [member] | Bottom of range [member]      
Disclosure of detailed information about borrowings [line items]      
Annual interest rate 0.13% 1.15% 0.13%
Long-term bank loans [member] | Top of range [member]      
Disclosure of detailed information about borrowings [line items]      
Annual interest rate 1.78% 1.35% 1.78%
Long term borrowings new taiwan dollar [member]      
Disclosure of detailed information about borrowings [line items]      
Unsecured loans $ 4,410.8 $ 6,706.4  
Long term borrowings japanese yen [member]      
Disclosure of detailed information about borrowings [line items]      
Unsecured loans $ 30,124.8