XML 31 R213.htm IDEA: XBRL DOCUMENT v3.20.1
Sensitivity analysis for provisions assumptions (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
PCBs | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase ₩ (527) ₩ (623)
0.1% Decrease 530 627
PCBs | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 534 632
0.1% Decrease (532) (629)
Nuclear plants | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase (316,184) (256,513)
0.1% Decrease 325,828 263,595
Nuclear plants | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 346,082 294,984
0.1% Decrease (336,182) (287,110)
Spent fuel | Discount rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase (51,607) (49,182)
0.1% Decrease 53,621 51,098
Spent fuel | Inflation rate    
Disclosure of Sensitivity analysis for provisions assumptions [Line Items]    
0.1% Increase 54,396 51,837
0.1% Decrease ₩ (52,424) ₩ (49,961)