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Selling and Administrative Expenses - Summary of Selling and Administrative Expenses (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]      
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
Disclosure - Other selling and administrative expenses      
General and administrative expenses 3,061,582 3,009,422 2,875,796
Selling and administrative expense      
Disclosure of attribution of expenses by nature to their function [line items]      
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
Disclosure - Other selling and administrative expenses      
Accommodation development expenses 49,988 56,038 57,815
Miscellaneous wages 97,474 31,910 47,221
Litigation and filing expenses 19,204 14,876 16,383
Compensation for damages 4,300 3,116 3,303
Outsourcing expenses 3,511 3,635 3,799
Reward expenses 2,770 2,740 3,006
Overseas market development expenses 1,503 1,376 1,192
Others 17,261 29,428 17,226
Others 196,011 143,119 149,945
General and administrative expenses ₩ 3,061,582 ₩ 3,009,422 ₩ 2,875,796