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

Finished goods

    $ 9,923.3      $ 11,329.8  

Work in process

      53,362.2        72,071.9  

Raw materials

      7,143.8        15,233.9  

Supplies and spare parts

      3,451.4        4,595.4  
  

 

 

     

 

 

  
   $ 73,880.7      $ 103,231.0