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

Finished goods

    $ 8,521.9      $ 9,923.3  

Work in process

      33,330.8        53,362.2  

Raw materials

      4,012.2        7,143.8  

Supplies and spare parts

      2,817.3        3,451.4  
  

 

 

     

 

 

  
   $ 48,682.2      $ 73,880.7