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Details of non-controlling interest prior to intra-group eliminations (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Subsidiaries [Member]      
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]      
Current assets of subsidiaries ₩ 2,029,674 ₩ 2,075,884 ₩ 2,030,665
Non-current assets of subsidiaries 4,638,564 4,421,596 4,165,052
Current liabilities of subsidiaries (867,786) (933,560) (1,094,870)
Non-current liabilities of subsidiaries (2,602,653) (2,304,159) (2,058,206)
Net assets of subsidiaries 3,197,799 3,259,761 3,042,641
Book value of non-controlling interest 1,370,166 1,393,331 1,502,377
Sales of subsidiaries 2,769,001 2,643,343 2,739,186
Profit for the period of subsidiaries 253,180 175,990 315,816
Profit for the period attributable to non-controlling interest of subsidiaries 101,122 81,982 135,970
Cash flows from operating activities of subsidiaries 452,206 512,611 414,012
Cash flows from investing activities of subsidiaries (661,844) (393,916) (143,447)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries 282,681 75,591 (476,730)
Dividends to non-controlling interests of subsidiaries (81,298) (99,256) (110,331)
Effect of exchange rate fluctuation of subsidiaries (18,239) 4,005 4,051
Net increase (decrease) of cash and cash equivalents of subsidiaries ₩ (26,494) ₩ 99,035 ₩ (312,445)
KEPCO Ilijan Corporation      
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]      
Percentage of ownership 49.00% 49.00% 49.00%
Current assets of subsidiaries ₩ 236,602 ₩ 173,931 ₩ 163,622
Non-current assets of subsidiaries 85,464 197,446 267,822
Current liabilities of subsidiaries (12,322) (11,990) (16,819)
Non-current liabilities of subsidiaries (34,912) (44,166) (36,594)
Net assets of subsidiaries 274,832 315,221 378,031
Book value of non-controlling interest 134,668 154,458 185,235
Sales of subsidiaries 81,400 95,072 99,844
Profit for the period of subsidiaries 39,443 40,818 49,631
Profit for the period attributable to non-controlling interest of subsidiaries 19,327 20,001 24,319
Cash flows from operating activities of subsidiaries 121,835 101,707 92,822
Cash flows from investing activities of subsidiaries 7,561 4,458 (4,452)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries (31,793) (68,678) (53,733)
Dividends to non-controlling interests of subsidiaries (30,319) (48,750) (51,626)
Effect of exchange rate fluctuation of subsidiaries (8,153) 2,111 2,840
Net increase (decrease) of cash and cash equivalents of subsidiaries ₩ 59,131 ₩ (9,152) ₩ (14,149)
KEPCO Plant Service & Engineering Co., Ltd.      
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]      
Percentage of ownership 49.00% 49.00% 49.00%
Current assets of subsidiaries ₩ 755,454 ₩ 779,764 ₩ 628,725
Non-current assets of subsidiaries 590,403 577,219 646,640
Current liabilities of subsidiaries (254,495) (247,737) (270,097)
Non-current liabilities of subsidiaries (42,020) (47,020) (26,331)
Net assets of subsidiaries 1,049,342 1,062,226 978,937
Book value of non-controlling interest 514,177 520,491 479,679
Sales of subsidiaries 1,299,186 1,244,613 1,239,604
Profit for the period of subsidiaries 85,916 157,737 160,791
Profit for the period attributable to non-controlling interest of subsidiaries 42,099 77,291 78,788
Cash flows from operating activities of subsidiaries 74,159 164,373 129,700
Cash flows from investing activities of subsidiaries 26,748 (89,159) (123,593)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries (47,809) (44,332) (33,737)
Dividends to non-controlling interests of subsidiaries (42,336) (39,466) (32,414)
Effect of exchange rate fluctuation of subsidiaries (2,171) (593) (124)
Net increase (decrease) of cash and cash equivalents of subsidiaries ₩ 8,591 ₩ (9,177) ₩ (60,168)
KEPCO Engineering & Construction Company, Inc.      
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]      
Percentage of ownership 33.92% 33.92% 33.92%
Current assets of subsidiaries ₩ 235,805 ₩ 257,593 ₩ 281,390
Non-current assets of subsidiaries 463,439 477,614 490,090
Current liabilities of subsidiaries (186,296) (223,522) (248,402)
Non-current liabilities of subsidiaries (13,873) (19,472) (61,698)
Net assets of subsidiaries 499,075 492,213 461,380
Book value of non-controlling interest 169,286 166,959 156,500
Sales of subsidiaries 431,723 448,635 433,701
Profit for the period of subsidiaries 20,160 26,398 12,937
Profit for the period attributable to non-controlling interest of subsidiaries 6,838 8,954 4,388
Cash flows from operating activities of subsidiaries 15,225 27,081 81,042
Cash flows from investing activities of subsidiaries (34,333) 47,219 (50,569)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries (9,165) (34,632) (14,591)
Dividends to non-controlling interests of subsidiaries (4,000) (1,807) (2,839)
Effect of exchange rate fluctuation of subsidiaries (22) (14) 31
Net increase (decrease) of cash and cash equivalents of subsidiaries (32,295) 37,847 13,074
Others      
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]      
Current assets of subsidiaries 801,813 864,596 956,928
Non-current assets of subsidiaries 3,499,258 3,169,317 2,760,500
Current liabilities of subsidiaries (414,673) (450,311) (559,552)
Non-current liabilities of subsidiaries (2,511,848) (2,193,501) (1,933,583)
Net assets of subsidiaries 1,374,550 1,390,101 1,224,293
Book value of non-controlling interest 552,035 551,423 680,963
Sales of subsidiaries 956,692 855,023 966,037
Profit for the period of subsidiaries 107,661 (48,963) 92,457
Profit for the period attributable to non-controlling interest of subsidiaries 32,858 (24,264) 28,475
Cash flows from operating activities of subsidiaries 240,987 219,450 110,448
Cash flows from investing activities of subsidiaries (661,820) (356,434) 35,167
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries 371,448 223,233 (374,669)
Dividends to non-controlling interests of subsidiaries (4,643) (9,233) (23,452)
Effect of exchange rate fluctuation of subsidiaries (7,893) 2,501 1,304
Net increase (decrease) of cash and cash equivalents of subsidiaries ₩ (61,921) ₩ 79,517 ₩ (251,202)