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Expenses Classified by Nature (Details) - KRW (₩) ₩ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Raw materials used | ₩ 18,575,160 | ₩ 13,544,827 | ₩ 17,084,029
Salaries | 5,394,159 | 5,278,637 | 4,609,976
Retirement benefits expense | 600,961 | 561,996 | 809,739
Welfare and benefit expense | 725,700 | 639,390 | 563,945
Insurance expense | 122,453 | 103,308 | 106,129
Depreciation | 11,767,104 | 11,369,496 | 10,966,756
Amortization of intangible assets | 166,161 | 170,466 | 156,915
Bad debt expense | 17,968 | 20,648 | (12,719)
Commission | 717,486 | 744,322 | 1,011,710
Advertising expense | 38,782 | 37,720 | 44,305
Training expense | 18,199 | 18,108 | 24,077
Vehicle maintenance expense | 17,001 | 16,596 | 17,177
Publishing expense | 6,868 | 7,201 | 6,837
Business promotion expense | 7,299 | 7,334 | 7,019
Rent expense | 237,120 | 227,410 | 216,918
Telecommunication expense | 19,528 | 18,647 | 19,485
Transportation expense | 54,235 | 11,369 | 5,420
Taxes and dues | 622,629 | 555,031 | 540,350
Expendable supplies expense | 50,419 | 44,995 | 39,681
Water, light and heating expense | 55,285 | 42,958 | 44,245
Repairs and maintenance expense | 2,615,164 | 2,544,901 | 2,298,854
Ordinary development expense | 689,397 | 700,642 | 735,715
Travel expense | 78,185 | 71,689 | 84,233
Clothing expense | 18,534 | 22,950 | 16,908
Survey and analysis expense | 4,844 | 4,572 | 4,797
Membership fee | 9,823 | 14,404 | 13,699
Power purchase | 21,632,127 | 15,725,220 | 18,269,732
Others | 2,172,371 | 1,978,202 | 2,763,479
Total expenses, by nature | 66,434,962 | 54,483,039 | 60,449,411
Selling and administrative expense |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Raw materials used | 0 | 0 | 0
Salaries | 1,121,188 | 1,095,183 | 775,204
Retirement benefits expense | 113,127 | 103,967 | 157,272
Welfare and benefit expense | 155,558 | 155,071 | 120,463
Insurance expense | 17,909 | 10,178 | 12,427
Depreciation | 219,427 | 218,103 | 232,510
Amortization of intangible assets | 91,428 | 87,086 | 76,547
Bad debt expense | 17,968 | 20,648 | (12,719)
Commission | 410,275 | 368,275 | 632,849
Advertising expense | 29,230 | 29,559 | 34,453
Training expense | 4,923 | 5,196 | 7,174
Vehicle maintenance expense | 8,849 | 9,435 | 9,525
Publishing expense | 3,568 | 3,677 | 3,414
Business promotion expense | 3,522 | 3,614 | 3,038
Rent expense | 43,650 | 36,337 | 40,505
Telecommunication expense | 8,569 | 8,686 | 8,451
Transportation expense | 870 | 1,007 | 865
Taxes and dues | 93,446 | 62,828 | 58,666
Expendable supplies expense | 9,052 | 8,029 | 6,682
Water, light and heating expense | 12,351 | 11,749 | 11,867
Repairs and maintenance expense | 123,134 | 79,185 | 88,576
Ordinary development expense | 213,936 | 197,436 | 224,463
Travel expense | 11,099 | 10,793 | 15,652
Clothing expense | 10,540 | 14,834 | 9,369
Survey and analysis expense | 889 | 826 | 848
Membership fee | 1,331 | 1,274 | 969
Power purchase | 0 | 0 | 0
Others | 149,945 | 135,467 | 150,506
Total expenses, by nature | 2,875,784 | 2,678,443 | 2,669,576
Cost of sales |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Raw materials used | 18,575,160 | 13,544,827 | 17,084,029
Salaries | 4,272,971 | 4,183,454 | 3,834,772
Retirement benefits expense | 487,834 | 458,029 | 652,467
Welfare and benefit expense | 570,142 | 484,319 | 443,482
Insurance expense | 104,544 | 93,130 | 93,702
Depreciation | 11,547,677 | 11,151,393 | 10,734,246
Amortization of intangible assets | 74,733 | 83,380 | 80,368
Bad debt expense | 0 | 0 | 0
Commission | 307,211 | 376,047 | 378,861
Advertising expense | 9,552 | 8,161 | 9,852
Training expense | 13,276 | 12,912 | 16,903
Vehicle maintenance expense | 8,152 | 7,161 | 7,652
Publishing expense | 3,300 | 3,524 | 3,423
Business promotion expense | 3,777 | 3,720 | 3,981
Rent expense | 193,470 | 191,073 | 176,413
Telecommunication expense | 10,959 | 9,961 | 11,034
Transportation expense | 53,365 | 10,362 | 4,555
Taxes and dues | 529,183 | 492,203 | 481,684
Expendable supplies expense | 41,367 | 36,966 | 32,999
Water, light and heating expense | 42,934 | 31,209 | 32,378
Repairs and maintenance expense | 2,492,030 | 2,465,716 | 2,210,278
Ordinary development expense | 475,461 | 503,206 | 511,252
Travel expense | 67,086 | 60,896 | 68,581
Clothing expense | 7,994 | 8,116 | 7,539
Survey and analysis expense | 3,955 | 3,746 | 3,949
Membership fee | 8,492 | 13,130 | 12,730
Power purchase | 21,632,127 | 15,725,220 | 18,269,732
Others | 2,022,426 | 1,842,735 | 2,612,973
Total expenses, by nature | ₩ 63,559,178 | ₩ 51,804,596 | ₩ 57,779,835

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