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Selling and Administrative Expenses (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Expenses by nature [Line Items]      
Raw materials used ₩ 13,544,827 ₩ 17,084,029 ₩ 19,537,928
Salaries 5,278,637 4,609,976 4,236,623
Retirement benefits expense 561,996 809,739 440,612
Welfare and benefit expense 639,390 563,945 596,572
Insurance expense 103,308 106,129 106,057
Depreciation 11,369,496 10,966,756 9,898,386
Amortization of intangible assets 170,466 156,915 118,938
Bad debt expense 20,648 (12,719) 39,784
Commission 744,322 1,011,710 1,189,284
Advertising expense 37,720 44,305 40,313
Training expense 18,108 24,077 20,373
Vehicle maintenance expense 16,596 17,177 17,957
Publishing expense 7,201 6,837 6,837
Business promotion expense 7,334 7,019 6,645
Rent expense 227,410 216,918 213,983
Telecommunication expense 18,647 19,485 106,073
Transportation expense 11,369 5,420 5,223
Taxes and dues 555,031 540,350 486,741
Expendable supplies expense 44,995 39,681 38,010
Water, light and heating expense 42,958 44,245 47,269
Repairs and maintenance expense 2,544,901 2,298,854 2,219,248
Ordinary development expense 700,642 735,715 723,888
Travel expense 71,689 84,233 81,427
Clothing expense 22,950 16,908 14,476
Survey and analysis expense 4,572 4,797 4,634
Membership fee 14,404 13,699 12,606
Power purchase 15,725,220 18,269,732 18,307,289
Disclosure - Other selling and administrative expenses      
Others 1,978,202 2,763,479 2,318,435
General and administrative expenses 2,678,443 2,669,576 2,627,890
Cost of sales 51,804,596 57,779,835 58,207,721
Total expenses, by nature 54,483,039 60,449,411 60,835,611
Selling and administrative expense      
Expenses by nature [Line Items]      
Raw materials used 0 0 0
Salaries 1,095,183 775,204 757,819
Retirement benefits expense 103,967 157,272 65,107
Welfare and benefit expense 155,071 120,463 132,089
Insurance expense 10,178 12,427 12,181
Depreciation 218,103 232,510 214,499
Amortization of intangible assets 87,086 76,547 54,153
Bad debt expense 20,648 (12,719) 39,784
Commission 368,275 632,849 714,096
Advertising expense 29,559 34,453 30,894
Training expense 5,196 7,174 6,277
Vehicle maintenance expense 9,435 9,525 10,148
Publishing expense 3,677 3,414 3,307
Business promotion expense 3,614 3,038 2,785
Rent expense 36,337 40,505 42,851
Telecommunication expense 8,686 8,451 23,505
Transportation expense 1,007 865 686
Taxes and dues 62,828 58,666 46,424
Expendable supplies expense 8,029 6,682 6,166
Water, light and heating expense 11,749 11,867 12,629
Repairs and maintenance expense 79,185 88,576 62,580
Ordinary development expense 197,436 224,463 215,494
Travel expense 10,793 15,652 14,363
Clothing expense 14,834 9,369 10,108
Survey and analysis expense 826 848 705
Membership fee 1,274 969 1,043
Power purchase 0 0 0
Disclosure - Other selling and administrative expenses      
Accommodation development expenses 30,889 53,945 52,822
Miscellaneous wages 45,887 39,794 32,447
Litigation and filing expenses 19,341 21,768 12,853
Compensation for damages 8,374 (1,924) 19,193
Outsourcing expenses 3,610 3,293 3,036
Reward expenses 3,228 2,858 2,713
Overseas market development expenses 1,218 1,997 1,361
Others 22,920 28,775 23,772
Others 135,467 150,506 148,197
General and administrative expenses 2,678,443 2,669,576 2,627,890
Total expenses, by nature ₩ 2,678,443 ₩ 2,669,576 ₩ 2,627,890