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Inventories (Tables)
 12 Months Ended
Dec. 31, 2022
Text Block [Abstract]  
Summary of Inventories
     
                         
      
                         
  
    
  December 31,  
2021
     
  December 31,  

2022
  
    
NT$
     
NT$
  
    
(In Millions)
     
(In Millions)
  
Finished goods
   
$
32,562.8
 
   
$
54,818.4
 
Work in process
   
 
137,700.4
 
   
 
125,661.9
 
Raw materials
   
 
11,111.1
 
   
 
20,389.1
 
Supplies and spare parts
   
 
11,728.0
 
   
 
20,279.7
 
    
 
 
     
 
 
  
     
    
$
193,102.3
 
   
$
221,149.1
 
    
 
 
     
 
 
  
Inventory write downs
Write-down of inventories to net realizable value and reversal of write-down of inventories resulting from the increase in net realizable value were included in the cost of revenue during reporting period. The amounts are illustrated below:
 
     
                         
      
                         
      
                         
  
    
Years Ended December 31
  
    
2020
     
2021
       
2022
  
    
NT$
     
NT$
       
NT$
  
    
(In Millions)
     
  (In Millions)   
       
 (In Millions) 
  
Inventory losses
   
$
3,664.5
 
   
$
533.0
 
     
$
       4,689.1