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Financial Assets at Amortized Cost-2018 (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Schedule of Financial Assets at Amortized Cost

     December 31,
2018		  
     NT$  
     (In Millions)  

Corporate bonds

    $ 19,520.0  

Commercial paper

      2,294.1  

Less: Allowance for impairment loss

      (8.2 ) 
  

 

 

  
   $ 21,805.9  
  

 

 

  

Current portion

    $ 14,277.6  

Noncurrent portion

      7,528.3  
  

 

 

  
   $ 21,805.9