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

Capacity guarantee

    $ 20,929.3      $ 13,346.6  

Receivables guarantee

      5,560.0        2,427.5  

Others

      181.3        306.5  
  

 

 

     

 

 

  
   $ 26,670.6      $ 16,080.6  
  

 

 

     

 

 

  

Current portion (classified under accrued expenses and other current liabilities)

    $ 12,000.2      $ 8,493.8  

Noncurrent portion

      14,670.4        7,586.8  
  

 

 

     

 

 

  
   $  26,670.6      $  16,080.6