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Financial Assets and Liabilities at Fair Value through Profit or Loss (Tables)
6 Months Ended
Jun. 30, 2021
Statement [LineItems]  
Summary of Financial Assets and Liabilities at Fair Value through Profit or Loss
    
December 31,

2020
    
June 30,

2021
 
    
NT$
    
NT$
 
    
(In Millions)
    
(In Millions)
 
Financial assets
                 
     
Mandatorily measured at FVTPL
                 
Forward exchange contracts
   $ 2,259.4      $ 58.3  
    
 
 
    
 
 
 
     
Financial liabilities
                 
     
Held for trading
                 
Forward exchange contracts
   $ 94.1      $ 1,828.3  
    
 
 
    
 
 
 
Forward exchange contracts [member]  
Statement [LineItems]  
Outstanding Derivative Contracts for which Hedge Accounting Treatment is not Applied
Outstanding forward exchange contracts consisted of the following:
 
    
Maturity Date
  
Contract Amount
(In Millions)
 
December 31, 2020
             
     
Sell NT$
   January 2021 to March 2021      NT$144,698.0  
Sell US$
   January 2021 to March 2021      US$1,176.9  
     
June 30, 2021
             
Sell NT$
   July 2021 to September 2021      NT$153,952.4  
Sell US$
   July 2021 to September 2021      US$1,738.7