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Risk Management - Summary of Sensitivity Analysis for Provisions Assumptions (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
PCBs | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase ₩ (222) ₩ (292)
0.1% Decrease 223 293
PCBs | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 224 295
0.1% Decrease (224) (294)
Nuclear plants | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase (369,540) (326,926)
0.1% Decrease 381,026 336,928
Nuclear plants | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 403,420 357,676
0.1% Decrease (391,754) (347,450)
Spent fuel | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase (51,430) (51,558)
0.1% Decrease 53,438 53,571
Spent fuel | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 54,210 54,345
0.1% Decrease ₩ (52,245) ₩ (52,375)