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Financial Assets and Liabilities at Fair Value through Profit or Loss (Tables)
 12 Months Ended
Dec. 31, 2017
Summary of Financial Assets and Liabilities at Fair Value through Profit or Loss
     December 31,
2016		      December 31,
2017		  
     NT$      NT$  
     (In Millions)      (In Millions)  

Financial assets

      

Held for trading

      

Forward exchange contracts

    $ 142.4      $ 569.8  

Cross currency swap contracts

      11.0        —  
  

 

 

     

 

 

  
     153.4        569.8  
  

 

 

     

 

 

  

Designated as at FVTPL

      

Time deposit

      6,297.7        —  
  

 

 

     

 

 

  
   $ 6,451.1      $ 569.8  
  

 

 

     

 

 

  

Financial liabilities

      

Held for trading

      

Forward exchange contracts

    $ 91.6      $ 26.7  

Designated as at FVTPL

      

Forward exchange contracts

      99.5        —  
  

 

 

     

 

 

  
   $ 191.1      $ 26.7  
  

 

 

     

 

 
Forward exchange contracts [member]  
Outstanding Derivative Contracts for which Hedge Accounting Treatment is not Applied

Outstanding forward exchange contracts consisted of the following:

 

          Contract Amount
     Maturity Date    (In Millions)
December 31, 2016      
Sell NT$/Buy EUR    January 2017    NT$5,393.3/EUR159.4
Sell NT$/Buy JPY    January 2017    NT$7,314.8/JPY26,501.8
Sell US$/Buy EUR    January 2017    US$4.2/EUR4.0
Sell US$/Buy JPY    January 2017    US$0.4/JPY50.0
Sell US$/Buy NT$    January 2017 to February 2017    US$439.0/NT$14,138.2
Sell US$/Buy RMB    January 2017 to June 2017    US$421.8/RMB2,908.4
December 31, 2017      
Sell NT$/Buy EUR    January 2018 to February 2018    NT$6,002.8/EUR169.0
Sell NT$/Buy JPY    February 2018    NT$996.3/JPY3,800.0
Sell US$/Buy JPY    January 2018    US$2.2/JPY246.7
Sell US$/Buy RMB    January 2018    US$558.0/RMB3,679.6
Sell US$/Buy NT$    January 2018 to February 2018    US$1,661.5/NT$49,673.3
Sell RMB /Buy EUR    January 2018    RMB39.0/EUR5.0
Sell RMB/Buy JPY    January 2018    RMB409.7/JPY7,062.5
Sell RMB/Buy GBP    January 2018    RMB3.6/GBP0.4
Cross currency swap contracts [member]  
Outstanding Derivative Contracts for which Hedge Accounting Treatment is not Applied

Outstanding cross currency swap contracts consisted of the following:

 

Maturity Date   

Contract Amount

(In Millions)

     

Range of

    Interest Rates    
Paid

    

Range of

  Interest Rates  
Received

  

December 31, 2016

        

January 2017

      US$170.0/ NT$5,487.6        3.98%       —