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Other Operating Income and Expenses, Net (Tables)
 12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Summary of Other Operating Income and Expenses, Net
     Years Ended December 31  
     2015      2016      2017  
     NT$      NT$      NT$  
     (In Millions)      (In Millions)      (In Millions)  

Gain (loss) on disposal or retirement of property, plant and equipment, net

    $ 433.5      $ 46.5      $ (1,097.9 ) 

Impairment loss on property, plant and equipment

      (2,545.6 )       —        —  

Gain from lease agreement modification

      430.0        —        —  

Others

      (198.5 )       (16.7 )       (267.6 ) 
  

 

 

     

 

 

     

 

 

  
   $ (1,880.6 )     $ 29.8      $ (1,365.5 )