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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

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