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Cash and Cash Equivalents (Tables)
 12 Months Ended
Dec. 31, 2022
Text Block [Abstract]  
Summary of Cash and Cash Equivalents
     
                        
      
                        
  
    
December 31,

2021
     
 December 31, 

2022
  
    
NT$
     
NT$
  
    
(In Millions)
     
(In Millions)
  
Cash and deposits in banks
   
$
1,058,808.1
 
   
$
1,329,291.4
 
Commercial paper
   
 
—
 
   
 
9,566.4
 
Government bonds
   
 
906.8
 
   
 
2,451.6
 
Repurchase agreements
   
 
5,275.3
 
   
 
1,133.3
 
Corporate bonds
   
 
—
 
   
 
371.4
 
    
 
 
     
 
 
  
    
$
1,064,990.2
 
   
$
1,342,814.1