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Hedging Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2023
Statement [LineItems]  
Summary of hedging financial instruments
    
 December 31, 

2022
    
 December 31, 

2023
 
           
NT$
                
NT$
       
           
(In Millions)
                
(In Millions)
       
Financial assets- current
              
Fair value hedges
              
Interest rate futures contracts
      $ 2.3          $ -      
     
 
 
        
 
 
   
Financial liabilities- current
              
Fair value hedges
              
Interest rate futures contracts
      $ 0.8          $ 43.8    
Hedges of net investments in foreign operations
              
Bank loans
        -               27,290.4     
     
 
 
        
 
 
   
      $ 0.8          $ 27,334.2    
     
 
 
        
 
 
   
Interest rate risk [member]  
Statement [LineItems]  
Summary of Information Related to Hedged Items
The following tables summarize the information relating to the hedges of interest rate risks.
December 31, 2022
 
Hedging Instruments
  
Contract Amount
(US$ in Millions)
  
Maturity
Interest rate futures contracts - US Treasury futures
   US$ 74.3    March 2023
Hedged Items
  
Asset Carrying Amount
NT$
(In Millions)
  
Accumulated
Amount of Fair Value
Hedge Adjustments
NT$
(In Millions)
Financial assets at FVTOCI
   $ 4,008.2    $  (1.5)
December 31, 2023
 
Hedging Instruments
  
Contract Amount
(US$ in Millions)
  
Maturity
Interest rate futures contracts - US Treasury futures
   US$ 48.6    March 2024
Hedged Items
  
Asset Carrying Amount
  
Accumulated
Amount of Fair Value
Hedge Adjustments
    
NT$
  
NT$
    
(In Millions)
  
(In Millions)
Financial assets at FVTOCI
   $ 3,959.5    $  43.8
The effect for the years ended December 31, 2021, 2022 and 2023 is detailed below:
 
Hedging Instruments/Hedged Items
 
Change in Value Used for Calculating Hedge

Ineffectiveness
 
   
Years Ended December 31
 
   
2021
   
2022
   
2023
 
   
NT$
   
NT$
   
NT$
 
   
(In Millions)
   
(In Millions)
   
(In Millions)
 
Hedging Instruments
                                            
Interest rate futures contracts - US Treasury futures
     $ 148.8          $ 284.0          $ 20.5    
Hedged Items
                    
Financial assets at FVTOCI
         (148.8            (284.0            (20.5  
    
 
 
        
 
 
        
 
 
   
     $ -           $ -           $ -     
    
 
 
        
 
 
        
 
 
   
Cash flow hedges [member]  
Statement [LineItems]  
Summary of Hedging Derivative Financial Instruments
The effect for the years ended December 31, 2021, 2022 and 2023 is detailed below:
 
Hedging Instruments/Hedged Items
 
Change in Value Used for Calculating Hedge

Ineffectiveness
 
   
Years Ended December 31
 
   
2021
   
2022
   
2023
 
          
NT$
                
NT$
                
NT$
       
          
(In Millions)
                
(In Millions)
                
(In Millions)
       
Hedging Instruments
                    
Forward exchange contracts (capital expenditures)
         $ (41.4 )                $ -                 $ 39.9        
    
 
 
        
 
 
        
 
 
   
Forward interest rate contracts (issuance of debts)
     $ 132.5          $ 1,379.1          $ -     
    
 
 
        
 
 
        
 
 
   
Hedged Items
                    
Forecast transaction (capital expenditures)
     $ 41.4          $ -           $ (39.9  
    
 
 
        
 
 
        
 
 
   
Forecast transaction (issuance of debts)
     $ (132.5        $ (1,379.1        $ -     
    
 
 
        
 
 
        
 
 
   
Hedges of net investments in foreign operations [member]  
Statement [LineItems]  
Summary of Hedging Derivative Financial Instruments
The effect for the years ended December 31, 2023 is detailed below:
 
    
Change in

Value Used for

Calculating

Hedge

Ineffectiveness
 
  Hedging Instruments/Hedged Items
  
Year Ended
December 31,
2023
 
Hedging Instruments
  
Bank loans
   $ 618.2  
  
 
 
 
Hedged Items
  
Net investments in foreign operations
   $ (618.2
  
 
 
 
Summary of the information relating to the hedges of net investments in foreign operations
The following tables summarize the information relating to the hedges of net investments in foreign operations.
December 31, 2023
 
Hedging Instruments
  
Contract
Amount
(In Millions)
    
Annual
Interest Rate
 
Maturity
  
Balance in
Other Equity
(Continuing
Hedges)
 
Bank loans
     JPY  124,500.0      0%    Due by April 2024     $ 618.2