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Inventories Related to Real Estate Business (Tables)
 12 Months Ended
Dec. 31, 2022
Text block [abstract]  
Summary of Inventories Related to Real Estate Business
   
December 31
  
   
2021
    
2022
  
   
NT$
    
NT$
    
US$ (Note 4)
  
       
Land and buildings held for sale
   $ 667,630     $ 678,080     $ 22,066  
Construction in progress
     2,956,958       3,023,070       98,375  
Land held for construction
     1,787,526       1,787,526       58,169  
   
 
 
    
 
 
    
 
 
  
       
    $   5,412,114     $   5,488,676     $    178,610