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Segment, Geographic and Other Information - Summary of Operating Segments (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of operating segments [line items] |  |  |
Total segment revenue | ₩ 87,476,410 | ₩ 70,546,024 | ₩ 60,012,375
Intersegment revenue | 0 | 0 | 0
Revenue from external customers | 87,476,410 | 70,546,024 | 60,012,375
Depreciation and amortisation | 13,032,263 | 12,461,412 | 11,942,492
Interest income | 429,620 | 340,753 | 221,874
Interest expense | 4,451,659 | 2,818,546 | 1,914,457
Employee benefit expense | 358,730 | 485,700 | 511,942
Loss on abandonment of property, plant and equipment | 196,697 | 160,909 | 207,934
Increase in provisions, net | 1,611,082 | 2,146,979 | 2,466,452
Operating profit (loss) | (4,245,016) | (32,240,531) | (5,722,991)
Finance income | 1,425,031 | 1,833,312 | 1,402,614
Finance expense | (5,347,018) | (4,746,791) | (3,245,777)
Profit (loss) related to associates and joint ventures | 613,026 | 1,310,391 | 494,584
Profit (loss) before income tax | (7,553,977) | (33,843,619) | (7,071,570)
Segment assets | 239,714,965 | 234,804,994 |
Investments in associates and joint ventures | 9,662,588 | 8,992,048 | 7,471,384
Acquisition of non-current assets | 14,746,889 | 12,612,993 |
Segment liabilities | 202,450,215 | 192,804,738 |
Deferred taxes |  |  |
Disclosure of operating segments [line items] |  |  |
Segment assets | 1,636 | (452) |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | 0 | 0 |
Segment liabilities | 1,629,280 | 2,801,832 |
Equity method adjustment |  |  |
Disclosure of operating segments [line items] |  |  |
Segment assets | 2,997,016 | 2,859,623 |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | 0 | 0 |
Segment liabilities | 0 | 0 |
Others |  |  |
Disclosure of operating segments [line items] |  |  |
Segment assets | (10,501,492) | (10,820,983) |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | 0 | 0 |
Segment liabilities | (3,450) | 2,489 |
Elimination of intersegment amounts |  |  |
Disclosure of operating segments [line items] |  |  |
Segment assets | (46,071,077) | (43,801,723) |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | (390,686) | (38,633) |
Segment liabilities | (11,463,805) | (9,304,648) |
Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Profit (loss) related to associates and joint ventures | 613,026 | 1,310,391 | 494,584
Segment assets | 293,288,882 | 286,568,529 |
Investments in associates and joint ventures | 9,662,588 | 8,992,048 |
Acquisition of non-current assets | 15,137,575 | 12,651,626 |
Segment liabilities | 212,288,190 | 199,305,065 |
Operating segments | Transmission and distribution |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 85,082,542 | 68,239,707 | 58,999,388
Intersegment revenue | 1,728,602 | 1,922,354 | 1,672,776
Revenue from external customers | 83,353,940 | 66,317,353 | 57,326,612
Depreciation and amortisation | 4,258,909 | 4,130,004 | 3,990,464
Interest income | 92,380 | 67,076 | 36,831
Interest expense | 2,826,916 | 1,420,802 | 678,986
Employee benefit expense | 127,038 | 180,114 | 193,412
Loss on abandonment of property, plant and equipment | 182,742 | 157,784 | 202,262
Increase in provisions, net | 419,564 | 611,534 | 1,194,643
Operating profit (loss) | (6,153,936) | (33,623,874) | (7,244,319)
Profit (loss) related to associates and joint ventures | 314,373 | 980,146 | 391,116
Segment assets | 138,838,342 | 131,023,727 |
Investments in associates and joint ventures | 5,872,000 | 5,678,141 |
Acquisition of non-current assets | 7,636,677 | 6,055,179 |
Segment liabilities | 120,181,250 | 108,963,058 |
Operating segments | Electric power generation (Nuclear) |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 10,798,378 | 10,386,091 | 9,324,391
Intersegment revenue | 10,666,260 | 10,254,271 | 9,207,516
Revenue from external customers | 132,118 | 131,820 | 116,875
Depreciation and amortisation | 4,403,610 | 4,034,774 | 3,611,594
Interest income | 69,209 | 45,789 | 22,209
Interest expense | 687,743 | 557,218 | 477,512
Employee benefit expense | 62,280 | 82,466 | 86,730
Loss on abandonment of property, plant and equipment | 0 | 0 | 0
Increase in provisions, net | 585,630 | 624,221 | 680,358
Operating profit (loss) | 819,838 | 761,109 | 762,164
Profit (loss) related to associates and joint ventures | (2,639) | (753) | (18,146)
Segment assets | 70,535,018 | 69,129,625 |
Investments in associates and joint ventures | 169,155 | 143,304 |
Acquisition of non-current assets | 3,070,528 | 2,008,409 |
Segment liabilities | 45,660,916 | 42,843,974 |
Operating segments | Electric power generation (Non-nuclear) |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 35,159,641 | 41,944,339 | 25,928,596
Intersegment revenue | 32,253,979 | 39,252,851 | 24,518,167
Revenue from external customers | 2,905,662 | 2,691,488 | 1,410,429
Depreciation and amortisation | 4,180,939 | 4,091,081 | 4,182,470
Interest income | 65,403 | 53,242 | 22,226
Interest expense | 741,282 | 694,559 | 624,391
Employee benefit expense | 109,151 | 140,067 | 121,020
Loss on abandonment of property, plant and equipment | 13,863 | 0 | 5,672
Increase in provisions, net | 352,058 | 619,947 | 285,152
Operating profit (loss) | 929,210 | 289,001 | 370,440
Profit (loss) related to associates and joint ventures | 301,681 | 329,112 | 109,765
Segment assets | 66,265,884 | 69,468,039 |
Investments in associates and joint ventures | 3,567,345 | 3,113,918 |
Acquisition of non-current assets | 3,490,863 | 3,547,815 |
Segment liabilities | 38,415,202 | 40,428,907 |
Operating segments | Plant maintenance & engineering service |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 3,091,022 | 2,975,062 | 2,805,785
Intersegment revenue | 2,626,190 | 2,516,699 | 2,370,900
Revenue from external customers | 464,832 | 458,363 | 434,885
Depreciation and amortisation | 129,628 | 123,168 | 121,493
Interest income | 23,638 | 14,003 | 9,515
Interest expense | 1,270 | 1,405 | 933
Employee benefit expense | 52,890 | 82,070 | 94,269
Loss on abandonment of property, plant and equipment | 0 | 0 | 0
Increase in provisions, net | 206,215 | 213,671 | 213,500
Operating profit (loss) | 355,284 | 239,529 | 245,360
Profit (loss) related to associates and joint ventures | (389) | 1,886 | 11,849
Segment assets | 4,271,409 | 4,051,157 |
Investments in associates and joint ventures | 54,088 | 56,685 |
Acquisition of non-current assets | 203,352 | 200,338 |
Segment liabilities | 1,549,863 | 1,272,408 |
Operating segments | Others |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 2,175,972 | 2,750,231 | 2,018,997
Intersegment revenue | 1,556,114 | 1,803,231 | 1,295,423
Revenue from external customers | 619,858 | 947,000 | 723,574
Depreciation and amortisation | 204,322 | 211,719 | 159,222
Interest income | 226,243 | 195,966 | 158,680
Interest expense | 258,877 | 195,860 | 162,345
Employee benefit expense | 48,105 | 53,017 | 52,698
Loss on abandonment of property, plant and equipment | 92 | 3,125 | 0
Increase in provisions, net | 444 | 9,463 | 2,981
Operating profit (loss) | 89,302 | 333,547 | 208,139
Profit (loss) related to associates and joint ventures | 0 | 0 | 0
Segment assets | 13,378,229 | 12,895,981 |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | 736,155 | 839,885 |
Segment liabilities | 6,480,959 | 5,796,718 |
Material reconciling items |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | (48,831,145) | (55,749,406) | (39,064,782)
Intersegment revenue | (48,831,145) | (55,749,406) | (39,064,782)
Revenue from external customers | 0 | 0 | 0
Depreciation and amortisation | (145,145) | (129,334) | (122,751)
Interest income | (47,253) | (35,323) | (27,587)
Interest expense | (64,429) | (51,298) | (29,710)
Employee benefit expense | (40,734) | (52,034) | (36,187)
Loss on abandonment of property, plant and equipment | 0 | 0 | 0
Increase in provisions, net | 47,171 | 68,143 | 89,818
Operating profit (loss) | (284,714) | (239,843) | (64,775)
Profit (loss) related to associates and joint ventures | 0 | 0 | ₩ 0
Segment assets | (53,573,917) | (51,763,535) |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | (390,686) | (38,633) |
Segment liabilities | ₩ (9,837,975) | ₩ (6,500,327) |

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