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Cash dividends received from subsidiaries (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Subsidiaries |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | ₩ 704,782 | ₩ 1,088,210 | ₩ 1,150,208
Korea Hydro & Nuclear Power |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 281,234 | 543,072 | 635,200
Korea South-East Power |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 33,928 | 106,546 | 124,169
Korea Midland Power |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 26,581 | 54,305 | 23,073
Korea Western Power |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 28,996 | 66,992 | 36,238
Korea Southern Power |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 25,780 | 60,630 | 17,849
Korea East-West Power |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 61,408 | 94,430 | 67,906
KEPCO Engineering & Construction Company |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 5,531 | 2,765 | 5,069
KEPCO Plant Service & Engineering |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 33,739 | 15,607 | 39,911
KEPCO Nuclear Fuel |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 1,077 | 3,231 | 3,411
KEPCO KDN |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 13,888 | 4,352 | 3,392
KEPCO International HongKong |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 23,314 | 4,304 | 9,107
KEPCO International Philippines |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 52,507 | 44,906 | 61,862
KEPCO Ilijan Corporation |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 53,900 | 50,849 | 57,979
KEPCO Philippines Holdings |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 26,023 | 17,747
KEPCO Neimenggu International |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 0 | 10,735
KOMIPO Global Pte |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 0 | 10,432
Qatrana Electric Power Company |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 6,240 | 5,939 | 8,331
KOSPO Jordan |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 0 | 1,095
KEPCO Energy Service Company |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 0 | 294
EWP Philippines Corporation |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 0 | 0
KEPCO Netherlands S3 B.V. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 3,115 | 0 | 0
PT. KOMIPO Pembangkitan Jawa Bali |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 20,658 | 3,188 | 3,222
KEPCO Netherlands J3 B.V. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 12,090 | 0 | 12,507
Gyeongju Wind Power |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 0 | 679
Energy New Industry Specialized Investment Private Investment Trust |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 291 | 0
HI Carbon Professional Private Special Asset Investment Trust 1 |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 11 | 11 | 0
KOSPO Power Services Limitada |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 993 | 425 | 0
Cogentrix Solar Services |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 0 | 344 | 0
KEPCO Netherlands B.V. |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 17,424 | 0 | 0
PT. Cirebon Power Service |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | 382 | 0 | 0
Chitose Solar Power Plant LLC |  |  |
Disclosure of Cash dividends received from subsidiaries [Line Items] |  |  |
Cash dividends received from subsidiaries | ₩ 1,986 | ₩ 0 | ₩ 0

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