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Cash and Cash Equivalents (Tables)
12 Months Ended
Dec. 31, 2019
TextBlock [abstract]  
Summary of Cash and Cash Equivalents
   
December 31,
2018
   
December 31,

2019
 
   
NT$
   
NT$
 
   
(In Millions)
   
(In Millions)
 
Cash and deposits in bank
s
  $575,825.5   $452,734.4 
Government bonds
       2,188.1 
Commercial paper
   759.5    476.8 
Repurchase agreements collateralized by corporate bonds
   1,229.6     
  
 
 
   
 
 
 
  $577,814.6   $455,399.3