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Other Gains and Losses, Net
 12 Months Ended
Dec. 31, 2022
Text Block [Abstract]  
Other Gains and Losses, Net
26.
OTHER GAINS AND LOSSES, NET
 
                                                                                              
    
Years Ended December 31
  
    
2020
     
2021
     
2022
  
    
NT$
     
NT$
     
NT$
  
    
(In Millions)
     
  (In Millions)
     
  (In Millions)
  
       
Gain (loss) on disposal of financial assets, net
                           
Investments in debt instruments at FVTOCI
   
$
1,439.4
 
   
$
93.2
 
   
$
(410.1
) 
Gain (loss) on financial instruments at FVTPL, net
                           
Mandatorily measured at FVTPL
   
 
8,244.5
 
   
 
(7,973.6
) 
   
 
(622.5
) 
The reversal (accrual) of expected credit loss of financial assets
                           
Investments in debt instruments at FVTOCI
   
 
0.9
 
   
 
(1.3
) 
   
 
(0.9
) 
Financial assets at amortized cost
   
 
(4.6
) 
   
 
4.0
 
   
 
(51.5
) 
Other gains, net
   
 
426.2
 
   
 
489.7
 
   
 
72.8
 
    
 
 
     
 
 
     
 
 
  
       
    
$
10,106.4
 
   
$
(7,388.0
) 
   
$
(1,012.2
)