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Share-based Payment (Tables)
12 Months Ended
Dec. 31, 2017
Text block1 [abstract]  
Information about Outstanding Employee Stock Options

Information about the TSMC’s outstanding employee stock options is described as follows:

 

    

Number of

Stock Options

(In Millions)

    

Weighted-

average

Exercise Price

(NT$)

 

Year ended December 31, 2015

     

Balance, beginning of year

     0.7      $ 47.2  

Options exercised

     (0.7      47.2  
  

 

 

    

Balance, end of year

             
  

 

 

    

Balance exercisable, end of year