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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items] |  |  |
Current assets of subsidiaries | ₩ 2,312,226 | ₩ 2,029,674 | ₩ 2,075,884
Non-current assets of subsidiaries | 4,931,883 | 4,638,564 | 4,421,596
Current liabilities of subsidiaries | (1,078,273) | (867,786) | (933,560)
Non-current liabilities of subsidiaries | (2,729,199) | (2,602,653) | (2,304,159)
Net assets of subsidiaries | 3,436,637 | 3,197,799 | 3,259,761
Book value of non-controlling interest | 1,542,839 | 1,370,166 | 1,393,331
Sales of subsidiaries | 3,147,175 | 2,769,001 | 2,643,343
Profit for the year of subsidiaries | 248,053 | 253,180 | 175,990
Profit for the year attributable to non-controlling interest of subsidiaries | 85,830 | 101,122 | 81,982
Cash flows from operating activities of subsidiaries | 528,862 | 452,206 | 512,611
Cash flows from investing activities of subsidiaries | (319,569) | (661,844) | (393,916)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries | (2,308) | 282,681 | 75,591
Dividends to non-controlling interests of subsidiaries | (31,516) | (81,298) | (99,256)
Effect of exchange rate fluctuation of subsidiaries | 18,849 | (18,239) | 4,005
Net increase (decrease) of cash and cash equivalents of subsidiaries | ₩ 194,318 | ₩ (26,494) | ₩ 99,035
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 | ₩ 234,224 | ₩ 236,602 | ₩ 173,931
Non-current assets of subsidiaries | 24,845 | 85,464 | 197,446
Current liabilities of subsidiaries | (30,783) | (12,322) | (11,990)
Non-current liabilities of subsidiaries | (7,772) | (34,912) | (44,166)
Net assets of subsidiaries | 220,514 | 274,832 | 315,221
Book value of non-controlling interest | 108,052 | 134,668 | 154,458
Sales of subsidiaries | 60,532 | 81,400 | 95,072
Profit for the year of subsidiaries | 12,981 | 39,443 | 40,818
Profit for the year attributable to non-controlling interest of subsidiaries | 6,361 | 19,327 | 20,001
Cash flows from operating activities of subsidiaries | 116,440 | 121,835 | 101,707
Cash flows from investing activities of subsidiaries | 2,216 | 7,561 | 4,458
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries | (88,927) | (31,793) | (68,678)
Dividends to non-controlling interests of subsidiaries | 0 | (30,319) | (48,750)
Effect of exchange rate fluctuation of subsidiaries | 10,683 | (8,153) | 2,111
Net increase (decrease) of cash and cash equivalents of subsidiaries | ₩ 40,412 | ₩ 59,131 | ₩ (9,152)
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 | ₩ 793,995 | ₩ 755,454 | ₩ 779,764
Non-current assets of subsidiaries | 626,710 | 590,403 | 577,219
Current liabilities of subsidiaries | (265,017) | (254,495) | (247,737)
Non-current liabilities of subsidiaries | (46,590) | (42,020) | (47,020)
Net assets of subsidiaries | 1,109,098 | 1,049,342 | 1,062,226
Book value of non-controlling interest | 543,458 | 514,177 | 520,491
Sales of subsidiaries | 1,375,668 | 1,299,186 | 1,244,613
Profit for the year of subsidiaries | 98,132 | 85,916 | 157,737
Profit for the year attributable to non-controlling interest of subsidiaries | 48,085 | 42,099 | 77,291
Cash flows from operating activities of subsidiaries | 133,160 | 74,159 | 164,373
Cash flows from investing activities of subsidiaries | (39,444) | 26,748 | (89,159)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries | (30,599) | (47,809) | (44,332)
Dividends to non-controlling interests of subsidiaries | (25,269) | (42,336) | (39,466)
Effect of exchange rate fluctuation of subsidiaries | 885 | (2,171) | (593)
Net increase (decrease) of cash and cash equivalents of subsidiaries | ₩ 38,733 | ₩ 8,591 | ₩ (9,177)
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 | ₩ 253,958 | ₩ 235,805 | ₩ 257,593
Non-current assets of subsidiaries | 451,085 | 463,439 | 477,614
Current liabilities of subsidiaries | (183,100) | (186,296) | (223,522)
Non-current liabilities of subsidiaries | (8,492) | (13,873) | (19,472)
Net assets of subsidiaries | 513,451 | 499,075 | 492,213
Book value of non-controlling interest | 174,163 | 169,286 | 166,959
Sales of subsidiaries | 433,127 | 431,723 | 448,635
Profit for the year of subsidiaries | 16,452 | 20,160 | 26,398
Profit for the year attributable to non-controlling interest of subsidiaries | 5,581 | 6,838 | 8,954
Cash flows from operating activities of subsidiaries | (16,270) | 15,225 | 27,081
Cash flows from investing activities of subsidiaries | 19,061 | (34,333) | 47,219
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries | (8,467) | (9,165) | (34,632)
Dividends to non-controlling interests of subsidiaries | (3,639) | (4,000) | (1,807)
Effect of exchange rate fluctuation of subsidiaries | 38 | (22) | (14)
Net increase (decrease) of cash and cash equivalents of subsidiaries | (9,277) | (32,295) | 37,847
Others |  |  |
Disclosure - Details of non-controlling interest prior to intra-group eliminations [Line Items] |  |  |
Current assets of subsidiaries | 1,030,049 | 801,813 | 864,596
Non-current assets of subsidiaries | 3,829,243 | 3,499,258 | 3,169,317
Current liabilities of subsidiaries | (599,373) | (414,673) | (450,311)
Non-current liabilities of subsidiaries | (2,666,345) | (2,511,848) | (2,193,501)
Net assets of subsidiaries | 1,593,574 | 1,374,550 | 1,390,101
Book value of non-controlling interest | 717,166 | 552,035 | 551,423
Sales of subsidiaries | 1,277,848 | 956,692 | 855,023
Profit for the year of subsidiaries | 120,488 | 107,661 | (48,963)
Profit for the year attributable to non-controlling interest of subsidiaries | 25,803 | 32,858 | (24,264)
Cash flows from operating activities of subsidiaries | 295,532 | 240,987 | 219,450
Cash flows from investing activities of subsidiaries | (301,402) | (661,820) | (356,434)
Cash flows from financing activities before dividends to non-controlling interests of subsidiaries | 125,685 | 371,448 | 223,233
Dividends to non-controlling interests of subsidiaries | (2,608) | (4,643) | (9,233)
Effect of exchange rate fluctuation of subsidiaries | 7,243 | (7,893) | 2,501
Net increase (decrease) of cash and cash equivalents of subsidiaries | ₩ 124,450 | ₩ (61,921) | ₩ 79,517

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