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Cash and Cash Equivalents (Tables)
6 Months Ended
Jun. 30, 2021
Text Block [Abstract]  
Summary of Cash and Cash Equivalents
    
December 31,

2020
    
June 30,

2021
 
    
NT$
    
NT$
 
    
(In Millions)
    
(In Millions)
 
Cash and deposits in banks
   $ 653,580.6      $ 745,313.2  
Government bonds
     3,716.1        2,668.9  
Repurchase agreements
     1,750.4         
Commercial paper
     1,123.5         
    
 
 
    
 
 
 
     $ 660,170.6      $ 747,982.1