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Consolidated Subsidiaries - Summary of Non-Controlling Interest Prior to Intra-Group Eliminations (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]      
Current assets ₩ 2,735,212 ₩ 2,611,740 ₩ 2,312,226
Non-current assets of subsidiaries 5,680,421 6,080,580 4,940,873
Current liabilities of subsidiaries (1,573,191) (1,405,456) (1,078,273)
Non-current liabilities of subsidiaries (2,800,982) (3,000,673) (2,729,199)
Net assets of subsidiaries 4,041,460 4,286,191 3,445,627
Book value of non-controlling interest 1,419,707 1,454,860 1,546,434
Sales 3,280,495 3,663,857 3,155,329
Profit for the year 261,366 223,856 255,829
Profit for the year attributable to non-controlling interest of subsidiaries 106,405 37,745 88,941
Cash flows from operating activities of subsidiaries 373,994 386,465 536,907
Cash flows from investing activities of subsidiaries (501,190) (678,819) (327,614)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries (17,359) 532,524 (2,308)
Dividends to non-controlling interests of subsidiaries (55,534) (42,344) (31,516)
Effect of exchange rate fluctuation of subsidiaries 7,459 (2,697) 18,849
Net increase (decrease) of cash and cash equivalents of subsidiaries ₩ (192,630) ₩ 195,129 ₩ 194,318
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 ₩ 142,023 ₩ 230,031 ₩ 234,224
Non-current assets of subsidiaries 688 1,101 24,845
Current liabilities of subsidiaries (252) (3,642) (30,783)
Non-current liabilities of subsidiaries (548) 0 (7,772)
Net assets of subsidiaries 141,911 227,490 220,514
Book value of non-controlling interest 69,536 111,470 108,052
Sales 0 23,263 60,532
Profit for the year 3,718 16,455 12,981
Profit for the year attributable to non-controlling interest of subsidiaries 1,822 8,063 6,361
Cash flows from operating activities of subsidiaries 1,086 68,475 116,440
Cash flows from investing activities of subsidiaries 84 22,604 2,216
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries (93,348) (9,609) (88,927)
Dividends to non-controlling interests of subsidiaries (643) (8,834) 0
Effect of exchange rate fluctuation of subsidiaries 5,135 8,807 10,683
Net increase (decrease) of cash and cash equivalents of subsidiaries ₩ (87,686) ₩ 81,443 ₩ 40,412
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 ₩ 953,211 ₩ 861,705 ₩ 793,995
Non-current assets of subsidiaries 632,169 693,748 626,710
Current liabilities of subsidiaries (313,249) (316,497) (265,017)
Non-current liabilities of subsidiaries (5,348) (28,205) (46,590)
Net assets of subsidiaries 1,266,783 1,210,751 1,109,098
Book value of non-controlling interest 620,723 593,268 543,458
Sales 1,523,031 1,425,913 1,375,668
Profit for the year 161,849 97,881 98,132
Profit for the year attributable to non-controlling interest of subsidiaries 79,306 47,962 48,085
Cash flows from operating activities of subsidiaries (35,492) 81,419 133,160
Cash flows from investing activities of subsidiaries 26,915 27,372 (39,444)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries (36,433) (33,187) (30,599)
Dividends to non-controlling interests of subsidiaries (28,775) (26,438) (25,269)
Effect of exchange rate fluctuation of subsidiaries (454) (486) 885
Net increase (decrease) of cash and cash equivalents of subsidiaries ₩ (74,239) ₩ 48,680 ₩ 38,733
KEPCO Engineering & Construction Company, Inc.      
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]      
Percentage of ownership 48.76% 33.92% 33.92%
Current assets ₩ 446,900 ₩ 372,031 ₩ 253,958
Non-current assets of subsidiaries 407,804 443,502 451,085
Current liabilities of subsidiaries (249,899) (243,796) (183,100)
Non-current liabilities of subsidiaries (57,497) (28,323) (8,492)
Net assets of subsidiaries 547,308 543,414 513,451
Book value of non-controlling interest 266,867 184,326 174,163
Sales 545,092 505,291 433,127
Profit for the year 32,654 17,954 16,452
Profit for the year attributable to non-controlling interest of subsidiaries 15,922 6,090 5,581
Cash flows from operating activities of subsidiaries 39,985 4,918 (16,270)
Cash flows from investing activities of subsidiaries (19,345) 18,712 19,061
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries (6,687) (7,260) (8,467)
Dividends to non-controlling interests of subsidiaries (5,250) (3,071) (3,639)
Effect of exchange rate fluctuation of subsidiaries (35) 5 38
Net increase (decrease) of cash and cash equivalents of subsidiaries 8,668 13,304 (9,277)
Others      
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]      
Current assets 1,193,078 1,147,973 1,030,049
Non-current assets of subsidiaries 4,639,760 4,942,229 3,838,233
Current liabilities of subsidiaries (1,009,791) (841,521) (599,373)
Non-current liabilities of subsidiaries (2,737,589) (2,944,145) (2,666,345)
Net assets of subsidiaries 2,085,458 2,304,536 1,602,564
Book value of non-controlling interest 462,581 565,796 720,761
Sales 1,212,372 1,709,390 1,286,002
Profit for the year 63,145 91,566 128,264
Profit for the year attributable to non-controlling interest of subsidiaries 9,355 (24,370) 28,914
Cash flows from operating activities of subsidiaries 368,415 231,653 303,577
Cash flows from investing activities of subsidiaries (508,844) (747,507) (309,447)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries 119,109 582,580 125,685
Dividends to non-controlling interests of subsidiaries (20,866) (4,001) (2,608)
Effect of exchange rate fluctuation of subsidiaries 2,813 (11,023) 7,243
Net increase (decrease) of cash and cash equivalents of subsidiaries ₩ (39,373) ₩ 51,702 ₩ 124,450