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Sensitivity analysis for provisions assumptions (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
PCBs | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase ₩ (623) ₩ (811)
0.1% Decrease 627 816
PCBs | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 632 826
0.1% Decrease (629) (822)
Nuclear plants | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase (256,513) (262,949)
0.1% Decrease 263,595 270,370
Nuclear plants | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 294,984 287,926
0.1% Decrease (287,110) (280,249)
Spent fuel | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase (49,182) (51,015)
0.1% Decrease 51,098 52,997
Spent fuel | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 51,837 53,763
0.1% Decrease ₩ (49,961) ₩ (51,823)