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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

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