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Restricted Deposits (Tables)
 12 Months Ended
Dec. 31, 2023
Restricted Deposits [Abstract]  
Summary of Restricted Deposits
Restricted deposits as of December 31, 2022 and 2023 are as follows:
 
                
2022
     
2023
  
                
In millions of won
  
Cash and cash equivalents
   
Escrow accounts
    ￦        2,912        3,010  
  
Deposits for government project and others
         30,586        26,969  
  
Collateral provided for borrowings
         250,346        190,525  
  
Collateral provided for lawsuit
         57        54  
  
Deposits for transmission regional support program
         8,626        9,481  
  
Deposits for other business purposes
         3,825        5,550  
Short-term financial instruments
   
Restriction on withdrawal related to ‘win-win growth program’ for small and medium enterprises and others
         101,500        80,500  
  
Collateral provided for borrowings
         1,000        24,728  
Non-current financial assets at fair value through profit or loss
   
Decommissioning costs of nuclear power plants
         386,220        271,047  
Long-term financial instruments
   
Escrow accounts
         1,603        —   
  
Guarantee deposits for banking accounts at oversea branches
         18        36  
  
Collateral provided for borrowings
         21,745        28,245  
  
Decommissioning costs of nuclear power plants
         497,609        655,030  
Other non-current assets
   
Deposits for other business purposes
         4,355        7,558  
        
 
 
     
 
 
  
      ￦        1,310,402        1,302,733