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Consolidated Subsidiaries - Summary of Non-Controlling Interest Prior to Intra-Group Eliminations (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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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)

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