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Risk Management - Summary of Sensitivity Analysis for Provisions Assumptions (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
PCBs | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase ₩ (169) ₩ (222)
0.1% Decrease 169 223
PCBs | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 169 224
0.1% Decrease (169) (224)
Nuclear plants | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase (474,432) (369,540)
0.1% Decrease 491,360 381,026
Nuclear plants | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 515,262 403,420
0.1% Decrease (498,258) (391,754)
Spent fuel | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase (54,330) (51,430)
0.1% Decrease 56,453 53,438
Spent fuel | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 57,269 54,210
0.1% Decrease (55,191) (52,245)
Radioactive waste | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase (15,089) (11,201)
0.1% Decrease 15,260 11,306
Radioactive waste | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 14,190 10,366
0.1% Decrease ₩ 14,056 ₩ (10,288)