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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]      
Current assets ₩ 2,611,740 ₩ 2,312,226 ₩ 2,029,674
Non-current assets of subsidiaries 6,080,580 4,940,873 4,638,564
Current liabilities of subsidiaries (1,405,456) (1,078,273) (867,786)
Non-current liabilities of subsidiaries (3,000,673) (2,729,199) (2,602,653)
Net assets of subsidiaries 4,286,191 3,445,627 3,197,799
Book value of non-controlling interest 1,454,860 1,546,434 1,370,650
Sales 3,663,857 3,155,329 2,769,001
Profit for the year 223,856 255,829 253,180
Profit for the year attributable to non-controlling interest of subsidiaries 37,745 88,941 101,606
Cash flows from operating activities of subsidiaries 386,465 536,907 452,206
Cash flows from investing activities of subsidiaries (678,819) (327,614) (661,844)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries 532,524 (2,308) 282,681
Dividends to non-controlling interests of subsidiaries (42,344) (31,516) (81,298)
Effect of exchange rate fluctuation of subsidiaries (2,697) 18,849 (18,239)
Net increase (decrease) of cash and cash equivalents of subsidiaries ₩ 195,129 ₩ 194,318 ₩ (26,494)
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 ₩ 230,031 ₩ 234,224 ₩ 236,602
Non-current assets of subsidiaries 1,101 24,845 85,464
Current liabilities of subsidiaries (3,642) (30,783) (12,322)
Non-current liabilities of subsidiaries 0 (7,772) (34,912)
Net assets of subsidiaries 227,490 220,514 274,832
Book value of non-controlling interest 111,470 108,052 134,668
Sales 23,263 60,532 81,400
Profit for the year 16,455 12,981 39,443
Profit for the year attributable to non-controlling interest of subsidiaries 8,063 6,361 19,327
Cash flows from operating activities of subsidiaries 68,475 116,440 121,835
Cash flows from investing activities of subsidiaries 22,604 2,216 7,561
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries (9,609) (88,927) (31,793)
Dividends to non-controlling interests of subsidiaries (8,834) 0 (30,319)
Effect of exchange rate fluctuation of subsidiaries 8,807 10,683 (8,153)
Net increase (decrease) of cash and cash equivalents of subsidiaries ₩ 81,443 ₩ 40,412 ₩ 59,131
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 ₩ 861,705 ₩ 793,995 ₩ 755,454
Non-current assets of subsidiaries 693,748 626,710 590,403
Current liabilities of subsidiaries (316,497) (265,017) (254,495)
Non-current liabilities of subsidiaries (28,205) (46,590) (42,020)
Net assets of subsidiaries 1,210,751 1,109,098 1,049,342
Book value of non-controlling interest 593,268 543,458 514,177
Sales 1,425,913 1,375,668 1,299,186
Profit for the year 97,881 98,132 85,916
Profit for the year attributable to non-controlling interest of subsidiaries 47,962 48,085 42,099
Cash flows from operating activities of subsidiaries 81,419 133,160 74,159
Cash flows from investing activities of subsidiaries 27,372 (39,444) 26,748
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries (33,187) (30,599) (47,809)
Dividends to non-controlling interests of subsidiaries (26,438) (25,269) (42,336)
Effect of exchange rate fluctuation of subsidiaries (486) 885 (2,171)
Net increase (decrease) of cash and cash equivalents of subsidiaries ₩ 48,680 ₩ 38,733 ₩ 8,591
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 ₩ 372,031 ₩ 253,958 ₩ 235,805
Non-current assets of subsidiaries 443,502 451,085 463,439
Current liabilities of subsidiaries (243,796) (183,100) (186,296)
Non-current liabilities of subsidiaries (28,323) (8,492) (13,873)
Net assets of subsidiaries 543,414 513,451 499,075
Book value of non-controlling interest 184,326 174,163 169,286
Sales 505,291 433,127 431,723
Profit for the year 17,954 16,452 20,160
Profit for the year attributable to non-controlling interest of subsidiaries 6,090 5,581 6,838
Cash flows from operating activities of subsidiaries 4,918 (16,270) 15,225
Cash flows from investing activities of subsidiaries 18,712 19,061 (34,333)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries (7,260) (8,467) (9,165)
Dividends to non-controlling interests of subsidiaries (3,071) (3,639) (4,000)
Effect of exchange rate fluctuation of subsidiaries 5 38 (22)
Net increase (decrease) of cash and cash equivalents of subsidiaries 13,304 (9,277) (32,295)
Others      
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items]      
Current assets 1,147,973 1,030,049 801,813
Non-current assets of subsidiaries 4,942,229 3,838,233 3,499,258
Current liabilities of subsidiaries (841,521) (599,373) (414,673)
Non-current liabilities of subsidiaries (2,944,145) (2,666,345) (2,511,848)
Net assets of subsidiaries 2,304,536 1,602,564 1,374,550
Book value of non-controlling interest 565,796 720,761 552,519
Sales 1,709,390 1,286,002 956,692
Profit for the year 91,566 128,264 107,661
Profit for the year attributable to non-controlling interest of subsidiaries (24,370) 28,914 33,342
Cash flows from operating activities of subsidiaries 231,653 303,577 240,987
Cash flows from investing activities of subsidiaries (747,507) (309,447) (661,820)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries 582,580 125,685 371,448
Dividends to non-controlling interests of subsidiaries (4,001) (2,608) (4,643)
Effect of exchange rate fluctuation of subsidiaries (11,023) 7,243 (7,893)
Net increase (decrease) of cash and cash equivalents of subsidiaries ₩ 51,702 ₩ 124,450 ₩ (61,921)