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Consolidated Subsidiaries - Summary of Cash Dividends Received from Subsidiaries (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Subsidiaries |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | ₩ 3,575,130 | ₩ 466,268 | ₩ 454,255
Korea Hydro & Nuclear Power Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 1,560,120 | 136,010 | 279,779
Korea South-East Power Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 340,710 | 4,808 | 0
Korea Midland Power Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 291,558 | 24,694 | 0
Korea Western Power Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 344,756 | 0 | 0
Korea Southern Power Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 293,027 | 0 | 0
Korea East-West Power Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 300,436 | 4,866 | 0
KEPCO Engineering & Construction Company, Inc. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 7,114 | 5,983 | 7,089
KEPCO Plant Service & Engineering Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 29,952 | 27,517 | 26,301
KEPCO Nuclear Fuel Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 15,178 | 11,184 | 5,206
KEPCO KDN Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 185,549 | 36,986 | 18,854
KEPCO Energy Solution Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 9,480 | 1,707 | 0
KEPCO Solar Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 16,023 | 1,409 | 0
KEPCO MCS Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 15,353 | 0 | 0
KEPCO International HongKong Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 5,962 | 9,044 | 0
KEPCO Philippines Corporation |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 24,246 | 2,375 | 0
KEPCO Ilijan Corporation |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 1,298 | 9,195 | 7,955
KEPCO Philippines Holdings Inc. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 1,386 | 34,913 | 60,520
KOSPO Australia Pty., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 31,386 | 3,095
KEPCO Netherlands B.V. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 3,124 | 16,795 | 0
Qatrana Electric Power Company |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 6,511 | 2,751 | 2,615
KEPCO KPS Philippines Corp. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 302 | 0
Tamra Offshore Wind Power Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 3,863 | 2,877 | 0
KEPCO Netherlands S3 B.V. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 2,477 | 4,005 | 0
PT. KOMIPO Pembangkitan Jawa Bali |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 578 | 859 | 153
PT. EWP Indonesia |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 4,262 | 0
Gyeongju Wind Power Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 6,300 | 2,100 | 2,800
KOSPO Power Services Ltda. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 1,201 | 305 | 0
KEPCO Netherlands J3 B.V. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 13,144 | 46,510 | 27,237
PT. Cirebon Power Service |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 12,673 | 241 | 0
Chitose Solar Power Plant LLC |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 1,386 | 639 | 0
Fujeij Wind Power Company |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 6,047 | 15,102 | 11,920
KOSPO Jordan LLC |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 6,089 | 11,450 | 731
EWP America Inc. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 3,887 | 0
KOWEPO Lao International |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 12,106 | 0
KEPCO Neimenggu International Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 4,058 | 0 | 0
KST Electric Power Company, S.A.P.I. de C.V. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 3,145 | 0 | 0
KOMIPO Global Pte Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 31,066 | 0 | 0
KOSPO Australia Pty., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 12,558 | 0 | 0
Changjuk Wind Power Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 4,015 | 0 | 0
EWP Barbados 1 SRL |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 12,987 | 0 | 0
KEPCO Energy Service Company |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 629 | 0 | 0
Chile Solar JV SpA |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | ₩ 1,127 | ₩ 0 | ₩ 0

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