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Held-to-maturity Financial Assets-2017 (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Held-to-maturity Financial Assets
     December 31,
2017		  
     NT$  
     (In Millions)  

Corporate bonds

    $ 19,338.8  

Structured product

      1,482.9  
  

 

 

  
   $ 20,821.7  
  

 

 

  

Current portion

    $ 1,988.4  

Noncurrent portion

      18,833.3  
  

 

 

  
   $ 20,821.7