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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

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- Definition The amount of raw materials and consumables used in the production process or in the rendering of services. [Refer: Current raw materials] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 102 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_102&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 99 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_99&doctype=Standard -URIDate 2023-03-23 + Details
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