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Cash dividends received from subsidiaries (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Subsidiaries      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries ₩ 362,162 ₩ 353,310 ₩ 704,782
Korea Hydro & Nuclear Power Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 106,675 0 281,234
Korea South-East Power Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 11,905 7,143 33,928
Korea Midland Power Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 0 0 26,581
Korea Western Power Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 0 0 28,996
Korea Southern Power Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 0 15,277 25,780
Korea East-West Power Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 17,959 985 61,408
KEPCO Engineering & Construction Company, Inc.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 7,793 3,519 5,531
KEPCO Plant Service & Engineering Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 44,068 41,084 33,739
KEPCO Nuclear Fuel Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 7,270 4,219 1,077
KEPCO KDN Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 14,720 19,136 13,888
KEPCO International HongKong Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 11,858 10,243 23,314
KEPCO International Philippines Inc.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 0 70,480 52,507
KEPCO Ilijan Corporation      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 34,502 65,776 53,900
KEPCO Philippines Holdings Inc.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 70,876 63,522 0
KOSEP Australia Pty., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 1,856 8,120 0
KOSPO Australia Pty., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 0 4,335 0
Qatrana Electric Power Company      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 0 10,313 6,240
KEPCO KPS Philippines Corp.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 1,215 3,854 0
Tamra Offshore Wind Power Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 2,640 4,823 0
KEPCO Netherlands S3 B.V.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 6,981 874 3,115
PT. KOMIPO Pembangkitan Jawa Bali      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 0 1,971 20,658
KEPCO Netherlands J3 B.V.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 0 0 12,090
Gyeongju Wind Power Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 2,800 2,800 0
VI Carbon Professional Private Special Asset Investment Trust 1      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 7 11 11
KOSPO Power Services Ltda.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 0 745 993
KEPCO Netherlands B.V.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 11,098 13,266 17,424
PT. Cirebon Power Service      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 221 0 382
Chitose Solar Power Plant LLC      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 858 814 1,986
Fujeij Wind Power Company      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 6,306 0 0
KOSPO Jordan LLC      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 535 0 0
Energy Innovation Fund I      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries ₩ 19 ₩ 0 ₩ 0