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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Subsidiaries |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | ₩ 407,308 | ₩ 3,575,130 | ₩ 466,268
Korea Hydro & Nuclear Power Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 1,560,120 | 136,010
Korea South-East Power Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 340,710 | 4,808
Korea Midland Power Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 291,558 | 24,694
Korea Western Power Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 344,756 | 0
Korea Southern Power Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 293,027 | 0
Korea East-West Power Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 300,436 | 4,866
KEPCO Engineering & Construction Company, Inc. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 10,039 | 7,114 | 5,983
KEPCO Plant Service & Engineering Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 49,529 | 29,952 | 27,517
KEPCO Nuclear Fuel Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 20,976 | 15,178 | 11,184
KEPCO KDN Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 185,549 | 36,986
KEPCO Solar Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 5,021 | 16,023 | 1,409
KEPCO MCS Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 15,353 | 0
KEPCO International HongKong Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 7,753 | 5,962 | 9,044
KEPCO Philippines Corporation |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 24,246 | 2,375
KEPCO Ilijan Corporation |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 41,234 | 1,298 | 9,195
KEPCO Philippines Holdings Inc. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 44,557 | 1,386 | 34,913
KOSPO Australia Pty., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 0 | 31,386
KEPCO Netherlands B.V. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 4,638 | 3,124 | 16,795
Qatrana Electric Power Company |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 1,056 | 6,511 | 2,751
KEPCO KPS Philippines Corp. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 0 | 302
Tamra Offshore Wind Power Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 3,863 | 2,877
KEPCO Netherlands S3 B.V. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 2,477 | 4,005
PT. KOMIPO Pembangkitan Jawa Bali |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 603 | 578 | 859
PT. EWP Indonesia |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 9,555 | 0 | 4,262
Gyeongju Wind Power Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 6,300 | 2,100
KOSPO Power Services Ltda. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 1,201 | 305
KEPCO Netherlands J3 B.V. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 8,820 | 13,144 | 46,510
PT. Cirebon Power Service |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 256 | 12,673 | 241
Chitose Solar Power Plant LLC |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 1,882 | 1,386 | 639
Fujeij Wind Power Company |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 8,563 | 6,047 | 15,102
KOSPO Jordan LLC |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 7,901 | 6,089 | 11,450
EWP America Inc. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 1,039 | 0 | 3,887
KOWEPO Lao International |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 3,631 | 0 | 12,106
KEPCO Neimenggu International Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 11,393 | 4,058 | 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 | 34,146 | 3,145 | 0
KOMIPO Global Pte Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 31,066 | 0
KOSPO Australia Pty., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 12,558 | 0
Changjuk Wind Power Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 4,015 | 0
EWP Barbados 1 SRL |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 12,987 | 0
KEPCO Energy Service Company |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 310 | 629 | 0
Chile Solar JV SpA |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 1,127 | 0
KEPCO ES Co., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 3,180 | 9,480 | 1,707
Haenanum Energy Fund |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 443 | 0 | 0
KEPCO International Philippines Inc. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 96,843 | 0 | 0
KOSEP Australia Pty., Ltd. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | ₩ 33,940 | ₩ 0 | ₩ 0

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