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Restricted Deposits (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Restricted Deposits [Line Items]    
Total Restricted Deposits ₩ 1,126,975 ₩ 991,634
Cash and Cash Equivalents    
Restricted Deposits [Line Items]    
Escrow accounts 0 53
Deposits for government project 12,747 15,365
Collateral provided for borrowings 100,998 79,569
Collateral provided for lawsuit 3 2
Deposits for transmission regional support program 4,337 2,320
Decommissioning costs of nuclear power plants 604 0
Financial assets available-for-sale    
Restricted Deposits [Line Items]    
Decommissioning costs of nuclear power plants 0 214,156
Short-term financial instruments    
Restricted Deposits [Line Items]    
Bidding guarantees 0 119
Restriction on withdrawal related to 'win-win growth program' for small and medium enterprises 34,000 34,000
Long-term financial instruments    
Restricted Deposits [Line Items]    
Escrow accounts 69 0
Decommissioning costs of nuclear power plants 245,896 337,234
Guarantee deposits for checking account 0 2
Guarantee deposits for banking accounts at oversea branches 315 302
Funds for developing small and medium enterprises [1] 200,000 200,000
Current Financial assets at fair value through other comprehensive income    
Restricted Deposits [Line Items]    
Decommissioning costs of nuclear power plants 29,451 0
Non-Current Financial assets at fair value through other comprehensive income    
Restricted Deposits [Line Items]    
Decommissioning costs of nuclear power plants 498,555 0
Financial assets at fair value through other comprehensive income    
Restricted Deposits [Line Items]    
Decommissioning costs of nuclear power plants ₩ 0 ₩ 108,512
[1] Deposits for small and medium enterprise at IBK and others for construction of Bitgaram Energy Valley and support for the high potential businesses as of December 31, 2017 and 2018.