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Restricted Deposits - Summary of Restricted Deposits (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2021
Dec. 31, 2020
Restricted Deposits [Line Items]    
Total Restricted Deposits ₩ 1,288,589 ₩ 1,295,758
Cash and Cash Equivalents    
Restricted Deposits [Line Items]    
Escrow accounts 0 544
Deposits for government project 22,286 5,066
Collateral provided for borrowings 264,813 117,747
Collateral provided for lawsuit 42 42
Deposits for transmission regional support program 5,921 5,469
Deposits for Other Business Purposes 3,050  
Short-term financial instruments    
Restricted Deposits [Line Items]    
Collateral provided for borrowings 11,745  
Restriction on withdrawal related to 'win-win growth program' for small and medium enterprises 114,000 109,000
Non-Current financial assets at fair value through profit or loss    
Restricted Deposits [Line Items]    
Decommissioning costs of nuclear power plants 531,720 577,481
Long-term financial instruments    
Restricted Deposits [Line Items]    
Escrow accounts 70 76
Collateral provided for borrowings 0 11,745
Decommissioning costs of nuclear power plants 324,609 258,282
Guarantee deposits for banking accounts at oversea branches 333 306
Funds for developing small and medium enterprises [1] ₩ 10,000 ₩ 210,000
[1] As of December 31, 2020, it consisted of the deposits for small and medium enterprises at the Industrial Bank of Korea (IBK) and others for construction of Bitgaram Energy Valley and support for high potential businesses amounting to ￦200,000 million and the deposits were returned during the year ended December 31, 2021.