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Financial Assets and Liabilities at Fair Value through Profit or Loss (Tables)
 12 Months Ended
Dec. 31, 2023
Statement [LineItems]  
Summary of Financial Assets and Liabilities at Fair Value through Profit or Loss
    
December 31,

2022
     
December 31,

2023
  
           
NT$
                  
NT$
        
           
(In Millions)
                  
(In Millions)
        
Financial assets
                
Mandatorily measured at FVTPL
                
Convertible preferred stocks
       $ -             $ 13,307.2    
Forward exchange contracts
         947.5             701.2    
Convertible bonds
         122.9             223.4    
Mutual funds
         -               110.3    
     
 
 
          
 
 
    
      $ 1,070.4           $ 14,342.1    
     
 
 
          
 
 
    
Current
       $ 1,070.4           $ 924.6    
Noncurrent
         -               13,417.5    
     
 
 
          
 
 
    
      $ 1,070.4           $ 14,342.1    
     
 
 
          
 
 
    
Financial liabilities
                
Held for trading
                
Forward exchange contracts
       $ 116.2           $ 121.4    
     
 
 
          
 
 
    
Forward exchange contracts [member]  
Statement [LineItems]  
Outstanding Derivative Contracts for which Hedge Accounting Treatment is not Applied
Outstanding forward exchange contracts consisted of the following:
 
    
Maturity Date
   
Contract Amount
(In Millions)
December 31, 2022
      
Sell NT$
   
January 2023
to
March 2023
    NT$  79,610.6
Sell US$
   
January 2023
to
March 2023
    US$    752.5
Sell RMB
   
January 2023
to
March 2023
    RMB  1,448.4
December 31, 2023
      
Sell NT$
   
January 2024
    NT$  26,251.8
Sell US$
   
January 2024
to
March 2024
    US$   1,112.0
Sell JPY
   
January 2024
    JPY  20,000.0