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Other Gains and Losses, Net (Tables)
 12 Months Ended
Dec. 31, 2023
Text Block [Abstract]  
Summary of Other Gains and Losses
   
Years Ended December 31
  
   
2021
    
2022
    
2023
  
   
NT$
(In Millions)
    
NT$
(In Millions)
    
NT$
(In Millions)
  
Gain (loss) on disposal of financial assets, net
                     
Investments in debt instruments at FVTOCI
      $ 93.2          $ (410.1 )         $ (473.9 )   
Gain on disposal of investments accounted for using equity method, net
              -                          -                          15.7          
Gain (loss) on financial instruments at FVTPL, net
                     
Mandatorily measured at FVTPL
        (7,973.6 )           (622.5 )           6,523.1    
The reversal (accrual) of expected credit loss of financial assets
                     
Investments in debt instruments at FVTOCI
        (1.3 )           (0.9 )           (9.5 )   
Financial assets at amortized cost
        4.0            (51.5 )           (26.2 )   
Other gains, net
        489.7            72.8            932.4    
    
 
 
         
 
 
         
 
 
    
     $  (7,388.0 )         $  (1,012.2 )         $  6,961.6