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Selling and Administrative Expenses - Summary of Selling and Administrative Expenses (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]      
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
Disclosure - Other selling and administrative expenses      
General and administrative expenses 2,875,784 2,678,443 2,669,576
Selling and administrative expense      
Disclosure of attribution of expenses by nature to their function [line items]      
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
Disclosure - Other selling and administrative expenses      
Accommodation development expenses 57,815 30,889 53,945
Miscellaneous wages 47,221 45,887 39,794
Litigation and filing expenses 16,383 19,341 21,768
Compensation for damages 3,303 8,374 (1,924)
Outsourcing expenses 3,799 3,610 3,293
Reward expenses 3,006 3,228 2,858
Overseas market development expenses 1,192 1,218 1,997
Others 17,226 22,920 28,775
Others 149,945 135,467 150,506
General and administrative expenses ₩ 2,875,784 ₩ 2,678,443 ₩ 2,669,576