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Assets Pledged as Collateral or for Security (Tables)
 12 Months Ended
Dec. 31, 2021
Text block [abstract]  
Summary of Assets Pledged as Collateral or for Security
The following assets were provided as collateral for bank borrowings, tariff guarantees of imported raw materials or collateral:
 
    
December 31
  
    
2020
     
2021
  
    
NT$
     
NT$
     
US$ (Note 4)
  
       
Inventories related to real estate business
    $ 10,564,873      $ 2,587,110      $ 93,263  
Property, plant and equipment
      124,124        114,390        4,124  
Investment properties
      11,847,145        20,796,862        749,707  
Other financial assets (including current and
non-current)
      460,890        444,358        16,018  
    
 
 
     
 
 
     
 
 
  
       
     $ 22,997,032      $ 23,942,720      $ 863,112