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Cash and Cash Equivalents (Tables)
 12 Months Ended
Dec. 31, 2018
Text block [abstract]  
Summary of Cash and Cash Equivalents
     December 31,
2017		      December 31,
2018		  
     NT$      NT$  
     (In Millions)      (In Millions)  

Cash and deposits in banks

    $ 551,919.8      $ 575,825.5  

Repurchase agreements collateralized by corporate bonds

      —        1,229.6  

Commercial paper

      695.9        759.5  

Agency bonds

      776.0        —  
  

 

 

     

 

 

  
   $ 553,391.7      $ 577,814.6