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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of operating segments [line items] |  |  |
Total segment revenue | ₩ 59,913,607 | ₩ 57,925,837 | ₩ 58,568,082
Intersegment revenue | 0 | 0 | 0
Revenue from external customers | 59,913,607 | 57,925,837 | 58,568,082
Depreciation and amortisation | 11,938,272 | 11,548,019 | 11,128,740
Interest income | 221,874 | 242,586 | 268,118
Interest expense | 1,914,457 | 1,995,425 | 2,046,811
Employee benefit expense | 511,942 | 492,288 | 725,120
Loss on abandonment of property, plant and equipment | 207,934 | 255,346 | 364,233
Increase in provisions, net | 2,466,452 | 1,832,765 | 2,301,215
Operating profit (loss) | (5,736,635) | 4,096,620 | (1,707,527)
Finance income | 1,402,614 | 1,510,249 | 1,009,706
Finance expense | (3,245,777) | (2,896,443) | (2,782,156)
Profit (loss) related to associates and joint ventures | 494,584 | 281,107 | 214,138
Profit (loss) before income tax | (7,085,214) | 2,991,533 | (3,265,838)
Segment assets | 211,108,870 | 203,142,111 |
Investments in associates and joint ventures | 7,471,384 | 6,170,533 |
Acquisition of non-current assets | 12,781,634 | 13,401,665 |
Segment liabilities | 145,797,021 | 132,475,265 |
Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Profit (loss) related to associates and joint ventures | 494,584 | 281,107 | 214,139
Segment assets | 252,045,653 | 241,913,304 |
Investments in associates and joint ventures | 7,471,384 | 6,170,533 |
Acquisition of non-current assets | 12,793,635 | 13,432,396 |
Segment liabilities | 148,745,359 | 133,818,362 |
Operating segments | Transmission and distribution |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 58,999,388 | 57,345,933 | 58,328,372
Intersegment revenue | 1,672,776 | 1,224,602 | 1,336,725
Revenue from external customers | 57,326,612 | 56,121,331 | 56,991,647
Depreciation and amortisation | 3,990,464 | 3,836,355 | 3,814,428
Interest income | 36,831 | 48,220 | 73,478
Interest expense | 678,986 | 737,973 | 777,120
Employee benefit expense | 193,412 | 190,302 | 298,144
Loss on abandonment of property, plant and equipment | 202,262 | 236,727 | 350,865
Increase in provisions, net | 1,194,643 | 731,194 | 987,828
Operating profit (loss) | (7,244,319) | 3,045,912 | (2,568,529)
Profit (loss) related to associates and joint ventures | 391,116 | 169,176 | 140,757
Segment assets | 115,578,517 | 113,115,667 |
Investments in associates and joint ventures | 4,700,863 | 4,204,090 |
Acquisition of non-current assets | 6,754,298 | 6,535,380 |
Segment liabilities | 68,531,927 | 59,772,046 |
Operating segments | Electric power generation (Nuclear) |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 9,324,391 | 9,938,941 | 8,937,026
Intersegment revenue | 9,207,516 | 9,817,147 | 8,908,803
Revenue from external customers | 116,875 | 121,794 | 28,223
Depreciation and amortisation | 3,611,594 | 3,564,120 | 3,227,695
Interest income | 22,209 | 25,581 | 37,277
Interest expense | 477,512 | 503,485 | 511,864
Employee benefit expense | 86,730 | 86,672 | 132,283
Loss on abandonment of property, plant and equipment | 0 | 0 | 0
Increase in provisions, net | 680,358 | 691,052 | 672,134
Operating profit (loss) | 762,164 | 1,168,833 | 782,511
Profit (loss) related to associates and joint ventures | (18,146) | (4,905) | (5,497)
Segment assets | 64,628,651 | 61,850,865 |
Investments in associates and joint ventures | 141,885 | 116,867 |
Acquisition of non-current assets | 1,959,479 | 2,419,939 |
Segment liabilities | 38,361,337 | 35,652,467 |
Operating segments | Electric power generation (Non-nuclear) |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 25,837,982 | 20,329,611 | 24,254,957
Intersegment revenue | 24,518,167 | 19,552,376 | 23,472,153
Revenue from external customers | 1,319,815 | 777,235 | 782,804
Depreciation and amortisation | 4,178,520 | 4,034,024 | 3,955,333
Interest income | 22,226 | 20,843 | 35,626
Interest expense | 624,391 | 622,346 | 655,466
Employee benefit expense | 121,020 | 112,775 | 163,626
Loss on abandonment of property, plant and equipment | 5,672 | 17,679 | 13,364
Increase in provisions, net | 285,152 | 346,195 | 766,407
Operating profit (loss) | 364,572 | (172,884) | 551,287
Profit (loss) related to associates and joint ventures | 109,765 | 115,096 | 77,641
Segment assets | 57,304,296 | 54,531,155 |
Investments in associates and joint ventures | 2,575,019 | 1,807,409 |
Acquisition of non-current assets | 3,331,813 | 3,758,795 |
Segment liabilities | 35,803,289 | 33,292,680 |
Operating segments | Plant maintenance & engineering service |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 2,805,785 | 2,703,472 | 2,627,539
Intersegment revenue | 2,370,900 | 2,283,333 | 2,254,841
Revenue from external customers | 434,885 | 420,139 | 372,698
Depreciation and amortisation | 121,493 | 119,056 | 125,546
Interest income | 9,515 | 11,789 | 14,214
Interest expense | 933 | 1,250 | 2,861
Employee benefit expense | 94,269 | 101,255 | 124,745
Loss on abandonment of property, plant and equipment | 0 | 0 | 0
Increase in provisions, net | 213,500 | 230,264 | 124,242
Operating profit (loss) | 245,360 | 197,553 | 312,341
Profit (loss) related to associates and joint ventures | 11,849 | 1,740 | 1,237
Segment assets | 3,672,366 | 3,492,571 |
Investments in associates and joint ventures | 53,617 | 42,167 |
Acquisition of non-current assets | 110,330 | 141,226 |
Segment liabilities | 1,086,926 | 1,061,949 |
Operating segments | Others |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 2,010,843 | 1,582,001 | 1,049,324
Intersegment revenue | 1,295,423 | 1,096,663 | 656,614
Revenue from external customers | 715,420 | 485,338 | 392,710
Depreciation and amortisation | 158,952 | 122,092 | 127,364
Interest income | 158,680 | 167,005 | 141,262
Interest expense | 162,345 | 162,843 | 134,248
Employee benefit expense | 52,698 | 50,889 | 18,409
Loss on abandonment of property, plant and equipment | 0 | 940 | 4
Increase in provisions, net | 2,981 | 3,711 | 2,408
Operating profit (loss) | 200,363 | 148,393 | (489,585)
Profit (loss) related to associates and joint ventures | 0 | 0 | 0
Segment assets | 10,861,823 | 8,923,046 |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | 637,715 | 577,056 |
Segment liabilities | 4,961,880 | 4,039,220 |
Material reconciling items |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | (39,064,782) | (33,974,121) | (36,629,136)
Intersegment revenue | (39,064,782) | (33,974,121) | (36,629,136)
Revenue from external customers | 0 | 0 | 0
Depreciation and amortisation | (122,751) | (127,628) | (121,626)
Interest income | (27,587) | (30,852) | (33,739)
Interest expense | (29,710) | (32,472) | (34,748)
Employee benefit expense | (36,187) | (49,605) | (12,087)
Loss on abandonment of property, plant and equipment | 0 | 0 | 0
Increase in provisions, net | 89,818 | (169,651) | (251,804)
Operating profit (loss) | (64,775) | (291,187) | (295,552)
Profit (loss) related to associates and joint ventures | 0 | 0 | ₩ 0
Segment assets | (40,936,783) | (38,771,193) |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | (12,001) | (30,731) |
Segment liabilities | (2,948,338) | (1,343,097) |
Elimination of intersegment amounts |  |  |
Disclosure of operating segments [line items] |  |  |
Segment assets | (41,701,400) | (39,762,888) |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | (12,001) | (30,731) |
Segment liabilities | (8,101,011) | (6,749,728) |
Equity method adjustment |  |  |
Disclosure of operating segments [line items] |  |  |
Segment assets | 1,866,554 | 1,372,001 |
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 | 1,881 | 47,664 |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | 0 | 0 |
Segment liabilities | 5,248,627 | 5,417,629 |
Others |  |  |
Disclosure of operating segments [line items] |  |  |
Segment assets | (1,103,818) | (427,970) |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | 0 | 0 |
Segment liabilities | ₩ (95,954) | ₩ (10,998) |

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