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Consolidated Subsidiaries - Summary of Cash Dividends Received from Subsidiaries (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Subsidiaries      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries ₩ 466,268 ₩ 454,255 ₩ 362,162
Korea Hydro & Nuclear Power Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 136,010 279,779 106,675
Korea South-East Power Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 4,808 0 11,905
Korea Midland Power Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 24,694 0 0
Korea East-West Power Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 4,866 0 17,959
KEPCO Engineering & Construction Company, Inc.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 5,983 7,089 7,793
KEPCO Plant Service & Engineering Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 27,517 26,301 44,068
KEPCO Nuclear Fuel Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 11,184 5,206 7,270
KEPCO KDN Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 36,986 18,854 14,720
KEPCO International HongKong Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 9,044 0 11,858
KEPCO Ilijan Corporation      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 9,195 7,955 34,502
KEPCO Philippines Holdings Inc.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 34,913 60,520 70,876
KOSEP Australia Pty., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 0 0 1,856
KOSPO Australia Pty., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 31,386 3,095 0
Qatrana Electric Power Company      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 2,751 2,615 0
KEPCO KPS Philippines Corp.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 302 0 1,215
Tamra Offshore Wind Power Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 2,877 0 2,640
KEPCO Netherlands S3 B.V.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 4,005 0 6,981
PT. KOMIPO Pembangkitan Jawa Bali      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 859 153 0
KEPCO Netherlands J3 B.V.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 46,510 27,237 0
Gyeongju Wind Power Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 2,100 2,800 2,800
VI Carbon Professional Private Special Asset Investment Trust 1      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 0 0 7
KOSPO Power Services Ltda.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 305 0 0
KEPCO Netherlands B.V.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 16,795 0 11,098
PT. Cirebon Power Service      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 241 0 221
Chitose Solar Power Plant LLC      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 639 0 858
Fujeij Wind Power Company      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 15,102 11,920 6,306
KOSPO Jordan LLC      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 11,450 731 535
Energy Innovation Fund I      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 0 0 19
KEPCO Energy Solution Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 1,707 0 0
KEPCO Solar Co., Ltd.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 1,409 0 0
KEPCO Philippines Corporation      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 2,375 0 0
PT. EWP Indonesia      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 4,262 0 0
EWP America Inc.      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 3,887 0 0
KOWEPO Lao International      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries ₩ 12,106 ₩ 0 ₩ 0