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Restricted Deposits - Summary of Restricted Deposits (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2022
Dec. 31, 2021
Restricted Deposits [Line Items]    
Total Restricted Deposits ₩ 1,310,402 ₩ 1,288,589
Cash and cash equivalents    
Restricted Deposits [Line Items]    
Escrow accounts 2,912 0
Deposits for government project 30,586 22,286
Collateral provided for borrowings 250,346 264,813
Collateral provided for lawsuit 57 42
Deposits for transmission regional support program 8,626 5,921
Deposits for other business purposes 3,825 3,050
Short-term financial instruments    
Restricted Deposits [Line Items]    
Collateral provided for borrowings 1,000 11,745
Restriction on withdrawal related to 'win-win growth program' for small and medium enterprises 101,500 114,000
Non-Current financial assets at fair value through profit or loss    
Restricted Deposits [Line Items]    
Decommissioning costs of nuclear power plants 386,220 531,720
Long-term financial instruments    
Restricted Deposits [Line Items]    
Escrow accounts 1,603 70
Collateral provided for borrowings 21,745 0
Decommissioning costs of nuclear power plants 497,609 324,609
Guarantee deposits for banking accounts at oversea branches 18 333
Funds for developing small and medium enterprises 0 10,000
Other Non-current assets    
Restricted Deposits [Line Items]    
Deposits for other business purposes ₩ 4,355 ₩ 0