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Selling and Administrative Expenses - Summary of Selling and Administrative Expenses (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]      
Salaries ₩ 5,471,459 ₩ 5,397,682 ₩ 5,278,637
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
Disclosure - Other selling and administrative expenses      
General and administrative expenses 3,009,422 2,875,796 2,678,443
Selling and administrative expense      
Disclosure of attribution of expenses by nature to their function [line items]      
Salaries 1,142,360 1,121,188 1,095,183
Retirement benefit 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
Disclosure - Other selling and administrative expenses      
Accommodation development expenses 56,038 57,815 30,889
Miscellaneous wages 31,910 47,221 45,887
Litigation and filing expenses 14,876 16,383 19,341
Compensation for damages 3,116 3,303 8,374
Outsourcing expenses 3,635 3,799 3,610
Reward expenses 2,740 3,006 3,228
Overseas market development expenses 1,376 1,192 1,218
Others 29,428 17,226 22,920
Others 143,119 149,945 135,467
General and administrative expenses ₩ 3,009,422 ₩ 2,875,796 ₩ 2,678,443