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Financial Assets at Amortized Cost (Tables)
 12 Months Ended
Dec. 31, 2019
TextBlock [abstract]  
Schedule of Financial Assets at Amortized Cost
 
   
December 31,
2018
   
December 31,

2019
 
   
NT$
   
NT$
 
   
(In Millions)
   
(In Millions)
 
Corporate bonds
  $19,520.0   $7,651.7 
Commercial paper
   2,294.1    — 
Less: Allowance for impairment loss
   (8.2)    (2.9) 
  
 
 
   
 
 
 
  $21,805.9   $7,648.8 
  
 
 
   
 
 
 
Current
  $14,277.6   $299.9 
Noncurrent
   7,528.3    7,348.9 
  
 
 
   
 
 
 
  $21,805.9   $7,648.8