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Finance Costs (Tables)
 12 Months Ended
Dec. 31, 2022
Text Block [Abstract]  
Summary of Finance Costs
 
                                                                                              
    
Years Ended December 31
  
    
2020
     
2021
     
2022
  
    
NT$
     
NT$
     
NT$
  
    
(In Millions)
     
  (In Millions)
     
  (In Millions)
  
       
Interest expense
                           
Corporate bonds
   
$
1,337.3
 
   
$
5,203.0
 
   
$
14,116.1
 
Lease liabilities
   
 
227.8
 
   
 
193.3
 
   
 
267.1
 
Bank loans
   
 
500.9
 
   
 
17.6
 
   
 
32.0
 
Others
   
 
15.5
 
   
 
0.3
 
   
 
1.7
 
Less: Capitalized interest under property, plant and equipment
   
 
—
 
   
 
—
 
   
 
(2,666.9
) 
    
 
 
     
 
 
     
 
 
  
       
    
$
2,081.5
 
   
$
5,414.2
 
   
$
11,750.0
 
    
 
 
     
 
 
     
 
 
  
Information about capitalized interest is as follows:
 
    
Years Ended
December 31,
2022
Capitalization rate
   
0.56%-3.36%