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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]      
Current assets ₩ 2,945,422 ₩ 2,735,212 ₩ 2,611,740
Non-current assets of subsidiaries 5,833,560 5,680,421 6,080,580
Current liabilities of subsidiaries (1,984,573) (1,573,191) (1,405,456)
Non-current liabilities of subsidiaries (2,600,698) (2,800,982) (3,000,673)
Net assets of subsidiaries 4,193,711 4,041,460 4,286,191
Book value of non-controlling interest 1,447,597 1,419,707 1,454,860
Sales 3,119,878 3,280,495 3,663,857
Profit for the year 354,711 261,366 223,856
Profit for the year attributable to non-controlling interest of subsidiaries 130,270 106,405 37,745
Cash flows from operating activities of subsidiaries 934,881 373,994 386,465
Cash flows from investing activities of subsidiaries (606,591) (501,190) (678,819)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries (300,782) (17,359) 532,524
Dividends to non-controlling interests of subsidiaries (137,216) (55,534) (42,344)
Effect of exchange rate fluctuation of subsidiaries 42,892 7,459 (2,697)
Net increase (decrease) of cash and cash equivalents ₩ (66,816) ₩ (192,630) ₩ 195,129
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 ₩ 1,033,936 ₩ 953,211 ₩ 861,705
Non-current assets of subsidiaries 641,840 632,169 693,748
Current liabilities of subsidiaries (341,918) (313,249) (316,497)
Non-current liabilities of subsidiaries (13,561) (5,348) (28,205)
Net assets of subsidiaries 1,320,297 1,266,783 1,210,751
Book value of non-controlling interest 646,946 620,723 593,268
Sales 1,534,269 1,523,031 1,425,913
Profit for the year 170,967 161,849 97,881
Profit for the year attributable to non-controlling interest of subsidiaries 83,774 79,306 47,962
Cash flows from operating activities of subsidiaries 538,151 (35,492) 81,419
Cash flows from investing activities of subsidiaries (379,243) 26,915 27,372
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries (63,535) (36,433) (33,187)
Dividends to non-controlling interests of subsidiaries (47,584) (28,775) (26,438)
Effect of exchange rate fluctuation of subsidiaries 1,362 (454) (486)
Net increase (decrease) of cash and cash equivalents ₩ 49,151 ₩ (74,239) ₩ 48,680
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 ₩ 58,291 ₩ 142,023 ₩ 230,031
Non-current assets of subsidiaries 461 688 1,101
Current liabilities of subsidiaries (280) (252) (3,642)
Non-current liabilities of subsidiaries (335) (548) 0
Net assets of subsidiaries 58,137 141,911 227,490
Book value of non-controlling interest 28,487 69,536 111,470
Sales 0 0 23,263
Profit for the year 4,549 3,718 16,455
Profit for the year attributable to non-controlling interest of subsidiaries 2,229 1,822 8,063
Cash flows from operating activities of subsidiaries 5,034 1,086 68,475
Cash flows from investing activities of subsidiaries 0 84 22,604
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries (64,696) (93,348) (9,609)
Dividends to non-controlling interests of subsidiaries (36,759) (643) (8,834)
Effect of exchange rate fluctuation of subsidiaries 12,321 5,135 8,807
Net increase (decrease) of cash and cash equivalents ₩ (84,100) ₩ (87,686) ₩ 81,443
KEPCO Engineering & Construction Company, Inc.      
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]      
Percentage of ownership 48.76% 48.76% 33.92%
Current assets ₩ 568,226 ₩ 446,900 ₩ 372,031
Non-current assets of subsidiaries 377,158 407,804 443,502
Current liabilities of subsidiaries (359,629) (249,899) (243,796)
Non-current liabilities of subsidiaries (8,281) (57,497) (28,323)
Net assets of subsidiaries 577,474 547,308 543,414
Book value of non-controlling interest 281,576 266,867 184,326
Sales 553,363 545,092 505,291
Profit for the year 58,513 32,654 17,954
Profit for the year attributable to non-controlling interest of subsidiaries 28,531 15,922 6,090
Cash flows from operating activities of subsidiaries 46,528 39,985 4,918
Cash flows from investing activities of subsidiaries (31,761) (19,345) 18,712
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries (11,104) (6,687) (7,260)
Dividends to non-controlling interests of subsidiaries (9,552) (5,250) (3,071)
Effect of exchange rate fluctuation of subsidiaries 447 (35) 5
Net increase (decrease) of cash and cash equivalents (5,442) 8,668 13,304
Others      
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]      
Current assets 1,284,969 1,193,078 1,147,973
Non-current assets of subsidiaries 4,814,101 4,639,760 4,942,229
Current liabilities of subsidiaries (1,282,746) (1,009,791) (841,521)
Non-current liabilities of subsidiaries (2,578,521) (2,737,589) (2,944,145)
Net assets of subsidiaries 2,237,803 2,085,458 2,304,536
Book value of non-controlling interest 490,588 462,581 565,796
Sales 1,032,246 1,212,372 1,709,390
Profit for the year 120,682 63,145 91,566
Profit for the year attributable to non-controlling interest of subsidiaries 15,736 9,355 (24,370)
Cash flows from operating activities of subsidiaries 345,168 368,415 231,653
Cash flows from investing activities of subsidiaries (195,587) (508,844) (747,507)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries (161,447) 119,109 582,580
Dividends to non-controlling interests of subsidiaries (43,321) (20,866) (4,001)
Effect of exchange rate fluctuation of subsidiaries 28,762 2,813 (11,023)
Net increase (decrease) of cash and cash equivalents ₩ (26,425) ₩ (39,373) ₩ 51,702