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Sensitivity analysis for provisions assumptions (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
PCBs | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase ₩ (292) ₩ (527)
0.1% Decrease 293 530
PCBs | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 295 534
0.1% Decrease (294) (532)
Nuclear plants | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase (326,926) (316,184)
0.1% Decrease 336,928 325,828
Nuclear plants | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 357,676 346,082
0.1% Decrease (347,450) (336,182)
Spent fuel | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase (51,558) (51,607)
0.1% Decrease 53,571 53,621
Spent fuel | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 54,345 54,396
0.1% Decrease ₩ (52,375) ₩ (52,424)