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

2020
    
December 31,

2021
 
    
NT$
    
NT$
 
    
(In Millions)
    
(In Millions)
 
Cash and deposits in banks
   $ 653,580.6      $ 1,058,808.1  
Repurchase agreements
     1,750.4        5,275.3  
Government bonds
     3,716.1        906.8  
Commercial paper
     1,123.5         
    
 
 
    
 
 
 
     $ 660,170.6      $ 1,064,990.2