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Financial Assets at Amortized Cost (Tables)
12 Months Ended
Dec. 31, 2020
Text Block [Abstract]  
Schedule of Financial Assets at Amortized Cost
   
December 31,

2019
   
December 31,

2020
 
   
NT$
   
NT$
 
   
(In Millions)
   
(In Millions)
 
Corporate bonds
  $7,651.7   $10,977.3 
Less: Allowance for impairment loss
   (2.9   (7.1
  
 
 
   
 
 
 
  $7,648.8   $10,970.2 
  
 
 
   
 
 
 
Current
  $299.9   $6,598.0 
Noncurrent
   7,348.9    4,372.2 
  
 
 
   
 
 
 
  $7,648.8   $10,970.2