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Cash and Cash Equivalents (Tables)
12 Months Ended
Dec. 31, 2020
Text Block [Abstract]  
Summary of Cash and Cash Equivalents
   
December 31,

2019
   
December 31,

2020
 
   
NT$
   
NT$
 
   
(In Millions)
   
(In Millions)
 
Cash and deposits in banks
  $452,734.4   $653,580.6 
Government bonds
   2,188.1    3,716.1 
Repurchase agreements
       1,750.4 
Commercial paper
   476.8    1,123.5 
  
 
 
   
 
 
 
  $455,399.3   $660,170.6