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Segment, Geographic and Other Information - Summary of Operating Segments (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Disclosure of operating segments [line items] |  |  |
Total segment revenue | ₩ 70,546,024 | ₩ 60,012,375 | ₩ 57,926,634
Intersegment revenue | 0 | 0 | 0
Revenue from external customers | 70,546,024 | 60,012,375 | 57,926,634
Depreciation and amortisation | 12,461,412 | 11,942,492 | 11,548,019
Interest income | 340,753 | 221,874 | 242,586
Interest expense | 2,818,546 | 1,914,457 | 1,995,425
Employee benefit expense | 485,700 | 511,942 | 492,288
Loss on abandonment of property, plant and equipment | 160,909 | 207,934 | 255,346
Increase in provisions, net | 2,146,979 | 2,466,452 | 1,832,765
Operating profit (loss) | (32,240,531) | (5,722,991) | 4,097,834
Finance income | 1,833,312 | 1,402,614 | 1,510,249
Finance expense | (4,746,791) | (3,245,777) | (2,896,443)
Profit (loss) related to associates and joint ventures | 1,310,391 | 494,584 | 281,107
Profit (loss) before income tax | (33,843,619) | (7,071,570) | 2,992,747
Segment assets | 234,804,994 | 211,123,727 |
Investments in associates and joint ventures | 8,992,048 | 7,471,384 |
Acquisition of non-current assets | 12,612,993 | 12,799,826 |
Segment liabilities | 192,804,738 | 145,797,021 |
Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Profit (loss) related to associates and joint ventures | 1,310,391 | 494,584 | 281,107
Segment assets | 286,568,529 | 252,060,510 |
Investments in associates and joint ventures | 8,992,048 | 7,471,384 |
Acquisition of non-current assets | 12,651,626 | 12,811,827 |
Segment liabilities | 199,305,065 | 148,745,359 |
Operating segments | Transmission and distribution |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 68,239,707 | 58,999,388 | 57,345,933
Intersegment revenue | 1,922,354 | 1,672,776 | 1,224,602
Revenue from external customers | 66,317,353 | 57,326,612 | 56,121,331
Depreciation and amortisation | 4,130,004 | 3,990,464 | 3,836,355
Interest income | 67,076 | 36,831 | 48,220
Interest expense | 1,420,802 | 678,986 | 737,973
Employee benefit expense | 180,114 | 193,412 | 190,302
Loss on abandonment of property, plant and equipment | 157,784 | 202,262 | 236,727
Increase in provisions, net | 611,534 | 1,194,643 | 731,194
Operating profit (loss) | (33,623,874) | (7,244,319) | 3,045,912
Profit (loss) related to associates and joint ventures | 980,146 | 391,116 | 169,176
Segment assets | 131,023,727 | 115,578,517 |
Investments in associates and joint ventures | 5,678,141 | 4,700,863 |
Acquisition of non-current assets | 6,055,179 | 6,754,298 |
Segment liabilities | 108,963,058 | 68,531,927 |
Operating segments | Electric power generation (Nuclear) |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 10,386,091 | 9,324,391 | 9,938,941
Intersegment revenue | 10,254,271 | 9,207,516 | 9,817,147
Revenue from external customers | 131,820 | 116,875 | 121,794
Depreciation and amortisation | 4,034,774 | 3,611,594 | 3,564,120
Interest income | 45,789 | 22,209 | 25,581
Interest expense | 557,218 | 477,512 | 503,485
Employee benefit expense | 82,466 | 86,730 | 86,672
Loss on abandonment of property, plant and equipment | 0 | 0 | 0
Increase in provisions, net | 624,221 | 680,358 | 691,052
Operating profit (loss) | 761,109 | 762,164 | 1,168,833
Profit (loss) related to associates and joint ventures | (753) | (18,146) | (4,905)
Segment assets | 69,129,625 | 64,628,651 |
Investments in associates and joint ventures | 143,304 | 141,885 |
Acquisition of non-current assets | 2,008,409 | 1,959,479 |
Segment liabilities | 42,843,974 | 38,361,337 |
Operating segments | Electric power generation (Non-nuclear) |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 41,944,339 | 25,928,596 | 20,329,611
Intersegment revenue | 39,252,851 | 24,518,167 | 19,552,376
Revenue from external customers | 2,691,488 | 1,410,429 | 777,235
Depreciation and amortisation | 4,091,081 | 4,182,470 | 4,034,024
Interest income | 53,242 | 22,226 | 20,843
Interest expense | 694,559 | 624,391 | 622,346
Employee benefit expense | 140,067 | 121,020 | 112,775
Loss on abandonment of property, plant and equipment | 0 | 5,672 | 17,679
Increase in provisions, net | 619,947 | 285,152 | 346,195
Operating profit (loss) | 289,001 | 370,440 | (172,884)
Profit (loss) related to associates and joint ventures | 329,112 | 109,765 | 115,096
Segment assets | 69,468,039 | 57,310,164 |
Investments in associates and joint ventures | 3,113,918 | 2,575,019 |
Acquisition of non-current assets | 3,547,815 | 3,341,960 |
Segment liabilities | 40,428,907 | 35,803,289 |
Operating segments | Plant maintenance & engineering service |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 2,975,062 | 2,805,785 | 2,703,472
Intersegment revenue | 2,516,699 | 2,370,900 | 2,283,333
Revenue from external customers | 458,363 | 434,885 | 420,139
Depreciation and amortisation | 123,168 | 121,493 | 119,056
Interest income | 14,003 | 9,515 | 11,789
Interest expense | 1,405 | 933 | 1,250
Employee benefit expense | 82,070 | 94,269 | 101,255
Loss on abandonment of property, plant and equipment | 0 | 0 | 0
Increase in provisions, net | 213,671 | 213,500 | 230,264
Operating profit (loss) | 239,529 | 245,360 | 197,553
Profit (loss) related to associates and joint ventures | 1,886 | 11,849 | 1,740
Segment assets | 4,051,157 | 3,672,366 |
Investments in associates and joint ventures | 56,685 | 53,617 |
Acquisition of non-current assets | 200,338 | 110,330 |
Segment liabilities | 1,272,408 | 1,086,926 |
Operating segments | Others |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 2,750,231 | 2,018,997 | 1,582,798
Intersegment revenue | 1,803,231 | 1,295,423 | 1,096,663
Revenue from external customers | 947,000 | 723,574 | 486,135
Depreciation and amortisation | 211,719 | 159,222 | 122,092
Interest income | 195,966 | 158,680 | 167,005
Interest expense | 195,860 | 162,345 | 162,843
Employee benefit expense | 53,017 | 52,698 | 50,889
Loss on abandonment of property, plant and equipment | 3,125 | 0 | 940
Increase in provisions, net | 9,463 | 2,981 | 3,711
Operating profit (loss) | 333,547 | 208,139 | 149,607
Profit (loss) related to associates and joint ventures | 0 | 0 | 0
Segment assets | 12,895,981 | 10,870,812 |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | 839,885 | 645,760 |
Segment liabilities | 5,796,718 | 4,961,880 |
Material reconciling items |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | (55,749,406) | (39,064,782) | (33,974,121)
Intersegment revenue | (55,749,406) | (39,064,782) | (33,974,121)
Revenue from external customers | 0 | 0 | 0
Depreciation and amortisation | (129,334) | (122,751) | (127,628)
Interest income | (35,323) | (27,587) | (30,852)
Interest expense | (51,298) | (29,710) | (32,472)
Employee benefit expense | (52,034) | (36,187) | (49,605)
Loss on abandonment of property, plant and equipment | 0 | 0 | 0
Increase in provisions, net | 68,143 | 89,818 | (169,651)
Operating profit (loss) | (239,843) | (64,775) | (291,187)
Profit (loss) related to associates and joint ventures | 0 | 0 | ₩ 0
Segment assets | (51,763,535) | (40,936,783) |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | (38,633) | (12,001) |
Segment liabilities | (6,500,327) | (2,948,338) |
Elimination of intersegment amounts |  |  |
Disclosure of operating segments [line items] |  |  |
Segment assets | (43,801,723) | (41,701,400) |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | (38,633) | (12,001) |
Segment liabilities | (9,304,648) | (8,101,011) |
Equity method adjustment |  |  |
Disclosure of operating segments [line items] |  |  |
Segment assets | 2,859,623 | 1,866,554 |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | 0 | 0 |
Segment liabilities | 0 | 0 |
Deferred taxes |  |  |
Disclosure of operating segments [line items] |  |  |
Segment assets | (452) | 1,881 |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | 0 | 0 |
Segment liabilities | 2,801,832 | 5,248,627 |
Others |  |  |
Disclosure of operating segments [line items] |  |  |
Segment assets | (10,820,983) | (1,103,818) |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | 0 | 0 |
Segment liabilities | ₩ 2,489 | ₩ (95,954) |

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