XML 206 R190.htm IDEA: XBRL DOCUMENT v3.21.1
Hybrid bond (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Hybrid bond [Line Items]    
Amount ₩ 398,910 ₩ 398,910
Korea South-East Power Co., Ltd. | 1st bond-type hybrid bond    
Hybrid bond [Line Items]    
Issue date Dec. 07, 2012 Dec. 07, 2012
Maturity date Dec. 06, 2042 Dec. 06, 2042
Yield (%) 4.38% 4.38%
Amount ₩ 170,000 ₩ 170,000
Korea South-East Power Co., Ltd. | 2nd bond-type hybrid bond    
Hybrid bond [Line Items]    
Issue date Dec. 07, 2012 Dec. 07, 2012
Maturity date Dec. 06, 2042 Dec. 06, 2042
Yield (%) 4.44% 4.44%
Amount ₩ 230,000 ₩ 230,000
Expense of issuance    
Hybrid bond [Line Items]    
Amount ₩ (1,090) ₩ (1,090)