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Expenses Classified by Nature (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of attribution of expenses by nature to their function [line items]      
Raw materials used ₩ 34,832,581 ₩ 18,660,477 ₩ 13,544,410
Salaries 5,471,459 5,397,682 5,278,637
Retirement benefits expense 615,370 601,390 561,996
Welfare and benefit expense 695,839 725,998 639,390
Insurance expense 127,507 122,453 103,308
Depreciation 12,301,131 11,771,324 11,369,496
Amortization of intangible assets 156,160 166,161 170,466
Bad debt expense 23,634 17,968 20,648
Commission 771,947 717,559 744,322
Advertising expense 44,291 38,782 37,720
Training expense 22,140 18,206 18,108
Vehicle maintenance expense 21,024 17,001 16,596
Publishing expense 6,746 6,878 7,201
Business promotion expense 6,538 7,299 7,334
Rent expense 234,119 237,884 227,410
Telecommunication expense 17,622 19,528 18,647
Transportation expense 114,857 54,235 11,369
Taxes and dues 676,497 622,826 555,031
Expendable supplies expense 56,776 50,466 44,995
Water, light and heating expense 77,952 55,376 42,958
Repairs and maintenance expense 2,739,424 2,617,995 2,544,901
Ordinary development expense 727,810 689,397 700,642
Travel expense 95,061 78,202 71,689
Clothing expense 21,822 18,534 22,950
Survey and analysis expense 5,448 4,881 4,572
Membership fee 18,381 9,823 14,404
Power purchase 41,984,858 21,619,039 15,725,220
Others 2,046,022 2,172,722 1,978,202
Total expenses, by nature 103,913,016 66,520,086 54,482,622
Selling and administrative expense      
Disclosure of attribution of expenses by nature to their function [line items]      
Raw materials used 0 0 0
Salaries 1,142,360 1,121,188 1,095,183
Retirement benefits expense 109,758 113,127 103,967
Welfare and benefit expense 155,781 155,558 155,071
Insurance expense 20,835 17,909 10,178
Depreciation 244,676 219,427 218,103
Amortization of intangible assets 85,661 91,428 87,086
Bad debt expense 23,634 17,968 20,648
Commission 420,390 410,287 368,275
Advertising expense 33,739 29,230 29,559
Training expense 7,327 4,923 5,196
Vehicle maintenance expense 10,749 8,849 9,435
Publishing expense 3,732 3,568 3,677
Business promotion expense 3,198 3,522 3,614
Rent expense 47,680 43,650 36,337
Telecommunication expense 7,945 8,569 8,686
Transportation expense 1,012 870 1,007
Taxes and dues 122,177 93,446 62,828
Expendable supplies expense 9,617 9,052 8,029
Water, light and heating expense 17,950 12,351 11,749
Repairs and maintenance expense 152,449 123,134 79,185
Ordinary development expense 213,932 213,936 197,436
Travel expense 16,062 11,099 10,793
Clothing expense 13,044 10,540 14,834
Survey and analysis expense 1,126 889 826
Membership fee 1,469 1,331 1,274
Power purchase 0 0 0
Others 143,119 149,945 135,467
Total expenses, by nature 3,009,422 2,875,796 2,678,443
Cost of sales      
Disclosure of attribution of expenses by nature to their function [line items]      
Raw materials used 34,832,581 18,660,477 13,544,410
Salaries 4,329,099 4,276,494 4,183,454
Retirement benefits expense 505,612 488,263 458,029
Welfare and benefit expense 540,058 570,440 484,319
Insurance expense 106,672 104,544 93,130
Depreciation 12,056,455 11,551,897 11,151,393
Amortization of intangible assets 70,499 74,733 83,380
Bad debt expense 0 0 0
Commission 351,557 307,272 376,047
Advertising expense 10,552 9,552 8,161
Training expense 14,813 13,283 12,912
Vehicle maintenance expense 10,275 8,152 7,161
Publishing expense 3,014 3,310 3,524
Business promotion expense 3,340 3,777 3,720
Rent expense 186,439 194,234 191,073
Telecommunication expense 9,677 10,959 9,961
Transportation expense 113,845 53,365 10,362
Taxes and dues 554,320 529,380 492,203
Expendable supplies expense 47,159 41,414 36,966
Water, light and heating expense 60,002 43,025 31,209
Repairs and maintenance expense 2,586,975 2,494,861 2,465,716
Ordinary development expense 513,878 475,461 503,206
Travel expense 78,999 67,103 60,896
Clothing expense 8,778 7,994 8,116
Survey and analysis expense 4,322 3,992 3,746
Membership fee 16,912 8,492 13,130
Power purchase 41,984,858 21,619,039 15,725,220
Others 1,902,903 2,022,777 1,842,735
Total expenses, by nature ₩ 100,903,594 ₩ 63,644,290 ₩ 51,804,179