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Cash and Cash Equivalents (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Cash and Cash Equivalents
     December 31,
2016		      December 31,
2017		  
     NT$      NT$  
     (In Millions)      (In Millions)  

Cash and deposits in banks

    $ 536,895.3      $ 551,919.8  

Agency bonds

      —        776.0  

Commercial paper

      1,997.2        695.9  

Repurchase agreements collateralized by corporate bonds

      2,361.3        —  
  

 

 

     

 

 

  
   $ 541,253.8      $ 553,391.7