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Cash dividends received from subsidiaries (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Subsidiaries [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries ₩ 1,088,210 ₩ 1,150,208 ₩ 833,195
Korea Hydro & Nuclear Power [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 543,072 635,200 446,399
Korea South-East Power [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 106,546 124,169 57,485
Korea Midland Power [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 54,305 23,073 16,580
Korea Western Power [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 66,992 36,238 22,749
Korea Southern Power [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 60,630 17,849 10,272
Korea East-West Power [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 94,430 67,906 25,280
KEPCO Engineering & Construction Company [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 2,765 5,069 14,574
KEPCO Plant Service & Engineering [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 15,607 39,911 40,584
KEPCO Nuclear Fuel [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 3,231 3,411 6,280
KEPCO KDN [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 4,352 3,392 4,046
KEPCO International HongKong [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 4,304 9,107 25,826
KEPCO International Philippines [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 44,906 61,862 32,891
KEPCO Ilijan Corporation [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 50,849 57,979 38,128
KEPCO Philippines Holdings [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 26,023 17,747 19,221
KEPCO Neimenggu International [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries   10,735 25,338
KOMIPO Global Pte [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries   10,432  
Qatrana Electric Power Company [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 5,939 8,331 16,857
KOSPO Jordan [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries   1,095  
KEPCO Energy Service Company [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries   294  
EWP Philippines Corporation [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries     5,586
KEPCO Netherlands S3 B.V. [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries     1,382
PT. KOMIPO Pembangkitan Jawa Bali [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 3,188 3,222 3,169
KEPCO Netherlands J3 B.V. [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries   12,507 19,254
Gyeongju Wind Power [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries   ₩ 679 ₩ 1,294
Energy New Industry Specialized Investment Private Investment Trust [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 291    
HI Carbon Professional Private Special Asset Investment Trust 1 [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 11    
KOSPO Power Services Limitada [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries 425    
Cogentrix Solar Services [Member]      
Disclosure of Cash dividends received from subsidiaries [Line Items]      
Cash dividends received from subsidiaries ₩ 344