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Statements of Appropriation of Retained Earnings (Disposition of Deficit) (Tables)
 12 Months Ended
Dec. 31, 2022
Statement of Appropriation of Retained Earnings [Abstract]  
Statements of Appropriation of Retained Earnings (Disposition of Deficit) Statements of disposition of deficit of KEPCO, the controlling company, for the years ended December 31, 2021 and 2022, respectively, are as follows:
 
          
2021
     
2022
  
                     
          
In millions of won except for
dividends per share
  
I.   Deficit before disposition
                          
Undisposed deficit carried over from prior years
   ￦          —          —    
Net loss
              (5,607,732 )       (25,297,713 ) 
Remeasurement of the defined benefit plan
                     107,884        327,056  
            
 
 
     
 
 
  
               (5,499,848 )       (24,970,657 ) 
            
 
 
     
 
 
  
II. Transfer from voluntary reserves
              5,499,848        24,970,657  
            
 
 
     
 
 
  
III.  Subtotal ( I+II )
              —          —    
            
 
 
     
 
 
  
IV.  Disposition of deficit
                          
            
 
 
     
 
 
  
V. Undisposed deficit to be carried over forward to subsequent year
              —          —