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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, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of operating segments [line items] |  |  |
Total segment revenue | ₩ 92,578,265 | ₩ 87,476,410 | ₩ 70,546,024
Intersegment revenue | 0 | 0 | 0
Revenue from external customers | 92,578,265 | 87,476,410 | 70,546,024
Depreciation and amortisation | 13,997,355 | 13,032,263 | 12,461,412
Interest income | 467,525 | 429,620 | 340,753
Interest expense | 4,665,095 | 4,451,659 | 2,818,546
Employee benefit expense | 427,980 | 358,730 | 485,700
Loss on abandonment of property, plant and equipment | 195,697 | 196,697 | 160,909
Increase in provisions, net | 1,762,526 | 1,611,082 | 2,146,979
Operating profit (loss) | 8,461,260 | (4,245,016) | (32,240,531)
Finance income | 3,448,177 | 1,425,031 | 1,833,312
Finance expense | (7,535,228) | (5,347,018) | (4,746,791)
Profit (loss) related to associates and joint ventures | 882,320 | 613,026 | 1,310,391
Profit (loss) before income tax | 5,256,529 | (7,553,977) | (33,843,619)
Segment assets | 246,807,795 | 239,714,965 |
Investments in associates and joint ventures | 11,286,094 | 9,662,588 | 8,992,048
Acquisition of non-current assets | 15,080,353 | 14,746,889 |
Segment liabilities | 205,444,962 | 202,450,215 |
Equity method adjustment |  |  |
Disclosure of operating segments [line items] |  |  |
Segment assets | 4,032,207 | 2,997,016 |
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 | 1,557 | 1,636 |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | 0 | 0 |
Segment liabilities | 2,152,192 | 1,629,280 |
Others |  |  |
Disclosure of operating segments [line items] |  |  |
Segment assets | (11,650,487) | (10,501,492) |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | 0 | 0 |
Segment liabilities | 870 | (3,450) |
Operating segments |  |  |
Disclosure of operating segments [line items] |  |  |
Profit (loss) related to associates and joint ventures | 882,320 | 613,026 | 1,310,391
Segment assets | 298,314,767 | 293,288,882 |
Investments in associates and joint ventures | 11,286,094 | 9,662,588 |
Acquisition of non-current assets | 15,266,334 | 15,137,575 |
Segment liabilities | 212,111,512 | 212,288,190 |
Operating segments | Transmission and distribution |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 90,825,950 | 85,082,542 | 68,239,707
Intersegment revenue | 2,217,014 | 1,728,602 | 1,922,354
Revenue from external customers | 88,608,936 | 83,353,940 | 66,317,353
Depreciation and amortisation | 4,368,806 | 4,258,909 | 4,130,004
Interest income | 86,889 | 92,380 | 67,076
Interest expense | 2,946,080 | 2,826,916 | 1,420,802
Employee benefit expense | 156,144 | 127,038 | 180,114
Loss on abandonment of property, plant and equipment | 171,134 | 182,742 | 157,784
Increase in provisions, net | 745,016 | 419,564 | 611,534
Operating profit (loss) | 3,542,715 | (6,153,936) | (33,623,874)
Profit (loss) related to associates and joint ventures | 578,973 | 314,373 | 980,146
Segment assets | 139,472,103 | 138,838,342 |
Investments in associates and joint ventures | 6,839,513 | 5,872,000 |
Acquisition of non-current assets | 8,417,992 | 7,636,677 |
Segment liabilities | 120,083,068 | 120,181,250 |
Operating segments | Electric power generation (Nuclear) |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 13,447,880 | 10,798,378 | 10,386,091
Intersegment revenue | 13,118,098 | 10,666,260 | 10,254,271
Revenue from external customers | 329,782 | 132,118 | 131,820
Depreciation and amortisation | 5,182,841 | 4,403,610 | 4,034,774
Interest income | 72,760 | 69,209 | 45,789
Interest expense | 786,491 | 687,743 | 557,218
Employee benefit expense | 68,273 | 62,280 | 82,466
Loss on abandonment of property, plant and equipment | 0 | 0 | 0
Increase in provisions, net | 343,963 | 585,630 | 624,221
Operating profit (loss) | 1,442,490 | 819,838 | 761,109
Profit (loss) related to associates and joint ventures | (20,548) | (2,639) | (753)
Segment assets | 72,508,359 | 70,535,018 |
Investments in associates and joint ventures | 171,956 | 169,155 |
Acquisition of non-current assets | 2,629,626 | 3,070,528 |
Segment liabilities | 47,082,862 | 45,660,916 |
Operating segments | Electric power generation (Non-nuclear) |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 31,563,589 | 35,159,641 | 41,944,339
Intersegment revenue | 29,186,796 | 32,253,979 | 39,252,851
Revenue from external customers | 2,376,793 | 2,905,662 | 2,691,488
Depreciation and amortisation | 4,252,872 | 4,180,939 | 4,091,081
Interest income | 67,835 | 65,403 | 53,242
Interest expense | 704,678 | 741,282 | 694,559
Employee benefit expense | 113,146 | 109,151 | 140,067
Loss on abandonment of property, plant and equipment | 2,744 | 13,863 | 0
Increase in provisions, net | 511,174 | 352,058 | 619,947
Operating profit (loss) | 2,662,597 | 929,210 | 289,001
Profit (loss) related to associates and joint ventures | 138,347 | 301,681 | 329,112
Segment assets | 66,834,569 | 66,265,884 |
Investments in associates and joint ventures | 4,272,928 | 3,567,345 |
Acquisition of non-current assets | 3,862,287 | 3,490,863 |
Segment liabilities | 36,363,754 | 38,415,202 |
Operating segments | Plant maintenance & engineering service |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 3,266,873 | 3,091,022 | 2,975,062
Intersegment revenue | 2,765,640 | 2,626,190 | 2,516,699
Revenue from external customers | 501,233 | 464,832 | 458,363
Depreciation and amortisation | 164,749 | 129,628 | 123,168
Interest income | 26,262 | 23,638 | 14,003
Interest expense | 7,144 | 1,270 | 1,405
Employee benefit expense | 70,891 | 52,890 | 82,070
Loss on abandonment of property, plant and equipment | 0 | 0 | 0
Increase in provisions, net | 241,073 | 206,215 | 213,671
Operating profit (loss) | 417,667 | 355,284 | 239,529
Profit (loss) related to associates and joint ventures | 185,548 | (389) | 1,886
Segment assets | 4,522,610 | 4,271,409 |
Investments in associates and joint ventures | 1,697 | 54,088 |
Acquisition of non-current assets | 160,978 | 203,352 |
Segment liabilities | 1,508,112 | 1,549,863 |
Operating segments | Others |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | 2,283,458 | 2,175,972 | 2,750,231
Intersegment revenue | 1,521,937 | 1,556,114 | 1,803,231
Revenue from external customers | 761,521 | 619,858 | 947,000
Depreciation and amortisation | 218,505 | 204,322 | 211,719
Interest income | 271,709 | 226,243 | 195,966
Interest expense | 336,718 | 258,877 | 195,860
Employee benefit expense | 47,039 | 48,105 | 53,017
Loss on abandonment of property, plant and equipment | 0 | 92 | 3,125
Increase in provisions, net | 2,409 | 444 | 9,463
Operating profit (loss) | 96,984 | 89,302 | 333,547
Profit (loss) related to associates and joint ventures | 0 | 0 | 0
Segment assets | 14,977,126 | 13,378,229 |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | 195,451 | 736,155 |
Segment liabilities | 7,073,716 | 6,480,959 |
Elimination of intersegment amounts |  |  |
Disclosure of operating segments [line items] |  |  |
Segment assets | (43,890,249) | (46,071,077) |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | (185,981) | (390,686) |
Segment liabilities | (8,819,612) | (11,463,805) |
Material reconciling items |  |  |
Disclosure of operating segments [line items] |  |  |
Total segment revenue | (48,809,485) | (48,831,145) | (55,749,406)
Intersegment revenue | (48,809,485) | (48,831,145) | (55,749,406)
Revenue from external customers | 0 | 0 | 0
Depreciation and amortisation | (190,418) | (145,145) | (129,334)
Interest income | (57,930) | (47,253) | (35,323)
Interest expense | (116,016) | (64,429) | (51,298)
Employee benefit expense | (27,513) | (40,734) | (52,034)
Loss on abandonment of property, plant and equipment | 21,819 | 0 | 0
Increase in provisions, net | (81,109) | 47,171 | 68,143
Operating profit (loss) | 298,807 | (284,714) | (239,843)
Profit (loss) related to associates and joint ventures | 0 | 0 | ₩ 0
Segment assets | (51,506,972) | (53,573,917) |
Investments in associates and joint ventures | 0 | 0 |
Acquisition of non-current assets | (185,981) | (390,686) |
Segment liabilities | ₩ (6,666,550) | ₩ (9,837,975) |

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