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Restricted Deposits (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Restricted Deposits [Line Items]    
Total Restricted Deposits ₩ 1,173,068 ₩ 1,126,975
Cash and Cash Equivalents    
Restricted Deposits [Line Items]    
Deposits for government project 9,287 12,747
Collateral provided for borrowings 63,198 100,998
Collateral provided for lawsuit 3 3
Deposits for transmission regional support program 3,002 4,337
Decommissioning costs of nuclear power plants   604
Total Restricted Deposits 75,490 118,689
Short-term financial instruments    
Restricted Deposits [Line Items]    
Restriction on withdrawal related to 'win-win growth program' for small and medium enterprises 93,000 34,000
Total Restricted Deposits 93,000 34,000
Current financial assets at fair value through profit or loss    
Restricted Deposits [Line Items]    
Decommissioning costs of nuclear power plants 0 29,451
Total Restricted Deposits 0 29,451
Non-Current financial assets at fair value through profit or loss    
Restricted Deposits [Line Items]    
Decommissioning costs of nuclear power plants 541,969 498,555
Total Restricted Deposits 541,969 498,555
Long-term financial instruments    
Restricted Deposits [Line Items]    
Escrow accounts 74 69
Collateral provided for borrowings 11,745  
Decommissioning costs of nuclear power plants 250,464 245,896
Guarantee deposits for banking accounts at oversea branches 326 315
Funds for developing small and medium enterprises [1] 200,000 200,000
Total Restricted Deposits ₩ 462,609 ₩ 446,280
[1] Deposits for small and medium enterprise at the Industrial Bank of Korea (IBK) and others for construction of Bitgaram Energy Valley businesses as of December 31, 2018 and 2019.