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Held-to-maturity Financial Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Held-to-maturity Financial Assets
     December 31,
2016		      December 31,
2017		  
     NT$      NT$  
     (In Millions)      (In Millions)  

Corporate bonds

    $ 23,849.7      $ 19,338.8  

Structured product

      1,609.9        1,482.9  

Commercial paper

      8,628.2        —  

Negotiable certificate of deposit

      4,829.9        —  
  

 

 

     

 

 

  
   $ 38,917.7      $ 20,821.7  
  

 

 

     

 

 

  

Current portion

    $ 16,610.1      $ 1,988.4  

Noncurrent portion

      22,307.6        18,833.3  
  

 

 

     

 

 

  
   $ 38,917.7      $ 20,821.7