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Restricted Deposits - Summary of Restricted Deposits (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2024
Dec. 31, 2023
Restricted Deposits [Line Items]    
Total Restricted Deposits ₩ 1,400,071 ₩ 1,302,733
Cash and cash equivalents    
Restricted Deposits [Line Items]    
Escrow accounts 3,280 3,010
Deposits for government project 30,812 26,969
Collateral provided for borrowings 211,522 190,525
Collateral provided for lawsuit 54 54
Deposits for transmission regional support program 8,959 9,481
Deposits for other business purposes 4,187 5,550
Short-term financial instruments    
Restricted Deposits [Line Items]    
Collateral provided for borrowings 85,569 24,728
Restriction on withdrawal related to 'win-win growth program' for small and medium enterprises 83,520 80,500
Non-Current financial assets at fair value through profit or loss    
Restricted Deposits [Line Items]    
Decommissioning costs of nuclear power plants 296,496 271,047
Long-term financial instruments    
Restricted Deposits [Line Items]    
Collateral provided for borrowings 6,500 28,245
Decommissioning costs of nuclear power plants 660,000 655,030
Guarantee deposits for banking accounts at overseas branches 22 36
Other Non-current assets    
Restricted Deposits [Line Items]    
Deposits for other business purposes ₩ 9,150 ₩ 7,558