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Earnings Per Share (Tables)
 12 Months Ended
Dec. 31, 2020
Text Block [Abstract]  
Computation of Earnings Per Share
 
   
Years Ended December 31
 
   
2018
   
2019
   
2020
 
   
(NT$)
   
(NT$)
   
(NT$)
 
Basic EPS
  $14.00   $13.65   $19.70 
   
 
 
   
 
 
   
 
 
 
Diluted EPS
  $               14.00   $                 13.65   $                19.70 
   
 
 
   
 
 
   
 
 
 
EPS is computed as follows:
 
   
Amounts
(Numerator)
NT$
(In Millions)
   
Number of
Shares
(Denominator)
(In Millions)
   
EPS (NT$)
 
Year Ended December 31, 2018
                                                                                    
Basic/Diluted EPS
               
Net income available to common shareholders of the parent
  $363,052.7    25,930.3   $14.00 
   
 
 
   
 
 
   
 
 
 
Year Ended December 31, 2019
               
Basic/Diluted EPS
               
Net income available to common shareholders of the parent
  $353,948.0    25,930.3   $13.65 
   
 
 
   
 
 
   
 
 
 

   
Amounts
(Numerator)
NT$
(In Millions)
   
Number of
Shares
(Denominator)
(In Millions)
   
EPS (NT$)
 
Year Ended December 31, 2020
                                                                                        
Basic/Diluted EPS
               
Net income available to common shareholders of the parent
  $510,744.0    25,930.3   $19.70