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Expenses Classified by Nature (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of attribution of expenses by nature to their function [line items]      
Raw materials used ₩ 21,070,280 ₩ 27,135,770 ₩ 34,832,581
Power purchase 34,659,893 38,304,309 41,984,858
Salaries 6,067,385 5,515,166 5,471,459
Retirement benefit expense 532,199 460,302 615,370
Welfare and benefit expense 697,964 695,203 695,839
Insurance expense 161,364 147,690 127,507
Depreciation 13,829,464 12,864,913 12,301,131
Amortization of intangible assets 163,567 163,174 156,160
Bad debt expense 35,232 62,808 23,634
Commission 856,953 801,768 771,947
Advertising expense 43,564 39,161 44,291
Training expense 26,067 23,964 22,140
Vehicle maintenance expense 18,634 18,172 21,024
Publishing expense 5,607 6,160 6,746
Business promotion expense 5,314 5,082 6,538
Rent expense 230,832 206,556 234,119
Telecommunication expense 19,326 17,519 17,622
Transportation expense 53,640 103,601 114,857
Taxes and dues 723,189 687,066 676,497
Expendable supplies expense 57,427 54,504 56,776
Water, light and heating expense 57,189 57,407 77,952
Repairs and maintenance expense 2,947,956 2,774,262 2,739,424
Ordinary development expense 773,931 717,561 727,810
Travel expense 93,569 93,497 95,061
Clothing expense 20,515 19,940 21,822
Survey and analysis expense 5,253 5,224 5,448
Membership fee 17,704 16,667 18,381
Others 1,860,168 1,763,663 2,046,022
Total expenses, by nature 85,034,186 92,761,109 103,913,016
Selling and administrative expense      
Disclosure of attribution of expenses by nature to their function [line items]      
Raw materials used 0 0 0
Power purchase 0 0 0
Salaries 1,180,379 1,098,460 1,142,360
Retirement benefit expense 104,036 89,533 109,758
Welfare and benefit expense 151,840 152,836 155,781
Insurance expense 30,460 27,726 20,835
Depreciation 231,114 241,533 244,676
Amortization of intangible assets 88,920 88,648 85,661
Bad debt expense 35,232 62,808 23,634
Commission 429,977 460,644 420,390
Advertising expense 32,205 30,305 33,739
Training expense 8,911 7,900 7,327
Vehicle maintenance expense 9,218 9,044 10,749
Publishing expense 2,857 3,281 3,732
Business promotion expense 2,687 2,559 3,198
Rent expense 48,474 44,807 47,680
Telecommunication expense 9,406 7,813 7,945
Transportation expense 1,108 1,099 1,012
Taxes and dues 98,714 112,449 122,177
Expendable supplies expense 6,976 7,252 9,617
Water, light and heating expense 15,009 16,207 17,950
Repairs and maintenance expense 197,942 154,062 152,449
Ordinary development expense 217,975 217,319 213,932
Travel expense 18,726 16,265 16,062
Clothing expense 11,216 10,450 13,044
Survey and analysis expense 871 1,068 1,126
Membership fee 1,709 1,503 1,469
Others 134,064 196,011 143,119
Total expenses, by nature 3,070,026 3,061,582 3,009,422
Cost of sales      
Disclosure of attribution of expenses by nature to their function [line items]      
Raw materials used 21,070,280 27,135,770 34,832,581
Power purchase 34,659,893 38,304,309 41,984,858
Salaries 4,887,006 4,416,706 4,329,099
Retirement benefit expense 428,163 370,769 505,612
Welfare and benefit expense 546,124 542,367 540,058
Insurance expense 130,904 119,964 106,672
Depreciation 13,598,350 12,623,380 12,056,455
Amortization of intangible assets 74,647 74,526 70,499
Bad debt expense 0 0 0
Commission 426,976 341,124 351,557
Advertising expense 11,359 8,856 10,552
Training expense 17,156 16,064 14,813
Vehicle maintenance expense 9,416 9,128 10,275
Publishing expense 2,750 2,879 3,014
Business promotion expense 2,627 2,523 3,340
Rent expense 182,358 161,749 186,439
Telecommunication expense 9,920 9,706 9,677
Transportation expense 52,532 102,502 113,845
Taxes and dues 624,475 574,617 554,320
Expendable supplies expense 50,451 47,252 47,159
Water, light and heating expense 42,180 41,200 60,002
Repairs and maintenance expense 2,750,014 2,620,200 2,586,975
Ordinary development expense 555,956 500,242 513,878
Travel expense 74,843 77,232 78,999
Clothing expense 9,299 9,490 8,778
Survey and analysis expense 4,382 4,156 4,322
Membership fee 15,995 15,164 16,912
Others 1,726,104 1,567,652 1,902,903
Total expenses, by nature ₩ 81,964,160 ₩ 89,699,527 ₩ 100,903,594