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Other Gains and Losses, Net (Tables)
 6 Months Ended
Jun. 30, 2021
Text Block [Abstract]  
Summary of Other Gains and Losses
    
Six Months Ended June 30
  
    
2020
     
2021
  
    
NT$
     
NT$
  
    
(In Millions)
     
(In Millions)
  
     
Gain on disposal of financial assets, net
                 
Investments in debt instruments at FVTOCI
   
$
 926.9     
$
 169.3  
Gain (loss) on financial instruments at FVTPL, net
                 
Mandatorily measured at FVTPL
      (1,507.8 )      (2,398.9 )
The reversal (accrual) of expected credit loss of financial assets
                 
Investments in debt instruments at FVTOCI
      0.2        (1.6 )
Financial assets at amortized cost
      (0.4 )       4.9  
Other gains, net
      79.3        273.1  
    
 
 
     
 
 
  
     $ (501.8 )     $ (1,953.2 )