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

Corporate bonds

    $ 40,165.2  

Agency bonds/Agency mortgage-backed securities

      29,235.4  

Asset-backed securities

      13,459.5  

Government bonds

      7,817.7  

Non-publicly traded equity investments

      4,874.3  

Publicly traded stocks

      2,548.1  

Commercial paper

      148.3  
  

 

 

  
   $ 98,248.5  
  

 

 

  

Current portion

    $ 93,374.2  

Noncurrent portion

      4,874.3  
  

 

 

  
   $ 98,248.5