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Expenses Classified by Nature (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of attribution of expenses by nature to their function [line items]      
Raw materials used ₩ 27,135,770 ₩ 34,832,581 ₩ 18,660,477
Power purchase 38,304,309 41,984,858 21,619,039
Salaries 5,515,166 5,471,459 5,397,682
Retirement benefit expense 460,302 615,370 601,390
Welfare and benefit expense 695,203 695,839 725,998
Insurance expense 147,690 127,507 122,453
Depreciation 12,864,913 12,301,131 11,771,324
Amortization of intangible assets 163,174 156,160 166,161
Bad debt expense 62,808 23,634 17,968
Commission 801,768 771,947 717,559
Advertising expense 39,161 44,291 38,782
Training expense 23,964 22,140 18,206
Vehicle maintenance expense 18,172 21,024 17,001
Publishing expense 6,160 6,746 6,878
Business promotion expense 5,082 6,538 7,299
Rent expense 206,556 234,119 237,884
Telecommunication expense 17,519 17,622 19,528
Transportation expense 103,601 114,857 54,235
Taxes and dues 687,066 676,497 622,826
Expendable supplies expense 54,504 56,776 50,466
Water, light and heating expense 57,407 77,952 55,376
Repairs and maintenance expense 2,774,262 2,739,424 2,617,995
Ordinary development expense 717,561 727,810 689,397
Travel expense 93,497 95,061 78,202
Clothing expense 19,940 21,822 18,534
Survey and analysis expense 5,224 5,448 4,881
Membership fee 16,667 18,381 9,823
Others 1,763,663 2,046,022 2,172,722
Total expenses, by nature 92,761,109 103,913,016 66,520,086
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 1,098,460 1,142,360 1,121,188
Retirement benefit expense 89,533 109,758 113,127
Welfare and benefit expense 152,836 155,781 155,558
Insurance expense 27,726 20,835 17,909
Depreciation 241,533 244,676 219,427
Amortization of intangible assets 88,648 85,661 91,428
Bad debt expense 62,808 23,634 17,968
Commission 460,644 420,390 410,287
Advertising expense 30,305 33,739 29,230
Training expense 7,900 7,327 4,923
Vehicle maintenance expense 9,044 10,749 8,849
Publishing expense 3,281 3,732 3,568
Business promotion expense 2,559 3,198 3,522
Rent expense 44,807 47,680 43,650
Telecommunication expense 7,813 7,945 8,569
Transportation expense 1,099 1,012 870
Taxes and dues 112,449 122,177 93,446
Expendable supplies expense 7,252 9,617 9,052
Water, light and heating expense 16,207 17,950 12,351
Repairs and maintenance expense 154,062 152,449 123,134
Ordinary development expense 217,319 213,932 213,936
Travel expense 16,265 16,062 11,099
Clothing expense 10,450 13,044 10,540
Survey and analysis expense 1,068 1,126 889
Membership fee 1,503 1,469 1,331
Others 196,011 143,119 149,945
Total expenses, by nature 3,061,582 3,009,422 2,875,796
Cost of sales      
Disclosure of attribution of expenses by nature to their function [line items]      
Raw materials used 27,135,770 34,832,581 18,660,477
Power purchase 38,304,309 41,984,858 21,619,039
Salaries 4,416,706 4,329,099 4,276,494
Retirement benefit expense 370,769 505,612 488,263
Welfare and benefit expense 542,367 540,058 570,440
Insurance expense 119,964 106,672 104,544
Depreciation 12,623,380 12,056,455 11,551,897
Amortization of intangible assets 74,526 70,499 74,733
Bad debt expense 0 0 0
Commission 341,124 351,557 307,272
Advertising expense 8,856 10,552 9,552
Training expense 16,064 14,813 13,283
Vehicle maintenance expense 9,128 10,275 8,152
Publishing expense 2,879 3,014 3,310
Business promotion expense 2,523 3,340 3,777
Rent expense 161,749 186,439 194,234
Telecommunication expense 9,706 9,677 10,959
Transportation expense 102,502 113,845 53,365
Taxes and dues 574,617 554,320 529,380
Expendable supplies expense 47,252 47,159 41,414
Water, light and heating expense 41,200 60,002 43,025
Repairs and maintenance expense 2,620,200 2,586,975 2,494,861
Ordinary development expense 500,242 513,878 475,461
Travel expense 77,232 78,999 67,103
Clothing expense 9,490 8,778 7,994
Survey and analysis expense 4,156 4,322 3,992
Membership fee 15,164 16,912 8,492
Others 1,567,652 1,902,903 2,022,777
Total expenses, by nature ₩ 89,699,527 ₩ 100,903,594 ₩ 63,644,290