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Segment, Geographic and Other Information - Summary of Operating Segments (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
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)