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Details of non-controlling interest prior to intra-group eliminations (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Subsidiaries [Member]    
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]    
Current assets of subsidiaries ₩ 2,311,226 ₩ 2,190,745
Non-current assets of subsidiaries 3,978,658 3,831,694
Current liabilities of subsidiaries (916,288) (867,716)
Non-current liabilities of subsidiaries (2,150,581) (2,074,333)
Net assets of subsidiaries 3,223,015 3,080,390
Book value of non-controlling interest 1,412,707 1,456,618
Sales of subsidiaries 2,550,576 2,511,444
Profit for the period of subsidiaries 289,443 258,175
Profit for the period attributable to non-controlling interest of subsidiaries 126,529 100,467
Cash flows from operating activities of subsidiaries 375,934 326,620
Cash flows from investing activities of subsidiaries (616,659) (295,540)
Cash flows from financing activities before dividends to non-controlling interest of subsidiaries 223,880 779,455
Dividends to non-controlling interest of subsidiaries (86,108) (116,437)
Effect of exchange rate fluctuation of subsidiaries (33,006) 8,018
Net increase (decrease) of cash and cash equivalents of subsidiaries ₩ (135,959) ₩ 702,116
KEPCO Ilijan Corporation [Member]    
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]    
Percentage of noncontrolling interest 49.00% 49.00%
Current assets of subsidiaries ₩ 160,588 ₩ 154,758
Non-current assets of subsidiaries 314,036 403,272
Current liabilities of subsidiaries (21,546) (19,256)
Non-current liabilities of subsidiaries (36,255) (39,193)
Net assets of subsidiaries 416,823 499,581
Book value of non-controlling interest 204,243 244,794
Sales of subsidiaries 109,183 116,667
Profit for the period of subsidiaries 66,320 51,552
Profit for the period attributable to non-controlling interest of subsidiaries 32,497 25,260
Cash flows from operating activities of subsidiaries 123,534 102,546
Cash flows from investing activities of subsidiaries (5,276) (117)
Cash flows from financing activities before dividends to non-controlling interest of subsidiaries (44,442) (56,863)
Dividends to non-controlling interest of subsidiaries (48,855) (55,705)
Effect of exchange rate fluctuation of subsidiaries (7,432) 1,529
Net increase (decrease) of cash and cash equivalents of subsidiaries ₩ 17,529 ₩ (8,610)
KEPCO Plant Service & Engineering [Member]    
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]    
Percentage of noncontrolling interest 49.00% 49.00%
Current assets of subsidiaries ₩ 623,934 ₩ 553,924
Non-current assets of subsidiaries 571,152 532,497
Current liabilities of subsidiaries (278,562) (264,506)
Non-current liabilities of subsidiaries (16,127) (36,984)
Net assets of subsidiaries 900,397 784,931
Book value of non-controlling interest 441,194 384,616
Sales of subsidiaries 1,232,113 1,214,304
Profit for the period of subsidiaries 135,482 86,657
Profit for the period attributable to non-controlling interest of subsidiaries 66,386 42,462
Cash flows from operating activities of subsidiaries 129,801 121,240
Cash flows from investing activities of subsidiaries (193,408) 79,807
Cash flows from financing activities before dividends to non-controlling interest of subsidiaries (15,606) (39,911)
Dividends to non-controlling interest of subsidiaries (14,994) (36,139)
Effect of exchange rate fluctuation of subsidiaries (1,267) 127
Net increase (decrease) of cash and cash equivalents of subsidiaries ₩ (95,474) ₩ 125,124
KEPCO Engineering & Construction Company [Member]    
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]    
Percentage of noncontrolling interest 33.92% 33.92%
Current assets of subsidiaries ₩ 257,529 ₩ 270,553
Non-current assets of subsidiaries 504,637 516,043
Current liabilities of subsidiaries (221,860) (286,444)
Non-current liabilities of subsidiaries (83,274) (78,232)
Net assets of subsidiaries 457,032 421,920
Book value of non-controlling interest 155,025 143,115
Sales of subsidiaries 490,193 506,012
Profit for the period of subsidiaries 21,222 17,796
Profit for the period attributable to non-controlling interest of subsidiaries 7,199 6,036
Cash flows from operating activities of subsidiaries 62,578 18,748
Cash flows from investing activities of subsidiaries (8,622) (7,556)
Cash flows from financing activities before dividends to non-controlling interest of subsidiaries (55,504) (1,634)
Dividends to non-controlling interest of subsidiaries (1,419) (2,539)
Effect of exchange rate fluctuation of subsidiaries (101) (854)
Net increase (decrease) of cash and cash equivalents of subsidiaries (3,068) 6,165
Others [Member]    
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]    
Current assets of subsidiaries 1,269,175 1,211,510
Non-current assets of subsidiaries 2,588,833 2,379,882
Current liabilities of subsidiaries (394,320) (297,510)
Non-current liabilities of subsidiaries (2,014,925) (1,919,924)
Net assets of subsidiaries 1,448,763 1,373,958
Book value of non-controlling interest 612,245 684,093
Sales of subsidiaries 719,087 674,461
Profit for the period of subsidiaries 66,419 102,170
Profit for the period attributable to non-controlling interest of subsidiaries 20,447 26,709
Cash flows from operating activities of subsidiaries 60,021 84,086
Cash flows from investing activities of subsidiaries (409,353) (367,674)
Cash flows from financing activities before dividends to non-controlling interest of subsidiaries 339,432 877,863
Dividends to non-controlling interest of subsidiaries (20,840) (22,054)
Effect of exchange rate fluctuation of subsidiaries (24,206) 7,216
Net increase (decrease) of cash and cash equivalents of subsidiaries ₩ (54,946) ₩ 579,437