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Expenses by nature (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Expenses by nature [Line Items]      
Raw materials used ₩ 17,084,029 ₩ 19,537,928 ₩ 15,924,707
Salaries 4,609,976 4,236,623 4,214,974
Retirement benefits expense 809,739 440,612 468,946
Welfare and benefit expense 563,945 596,572 723,144
Insurance expense 106,129 106,057 106,091
Depreciation 10,966,756 9,898,386 9,652,219
Amortization of intangible assets 156,915 118,938 113,672
Bad debt expense (12,719) 39,784 126,714
Commission 1,011,710 1,189,284 1,143,435
Advertising expense 44,305 40,313 125,436
Training expense 24,077 20,373 21,389
Vehicle maintenance expense 17,177 17,957 17,466
Publishing expense 6,837 6,837 7,920
Business promotion expense 7,019 6,645 8,673
Rental expense 216,918 213,983 186,889
Telecommunication expense 19,485 106,073 98,872
Transportation expense 5,420 5,223 9,640
Taxes and dues 540,350 486,741 486,038
Expendable supplies expense 39,681 38,010 39,725
Water, light and heating expense 44,245 47,269 40,695
Repairs and maintenance expense 2,298,854 2,219,248 2,111,420
Ordinary development expense 735,715 723,888 721,437
Travel expense 84,233 81,427 85,673
Clothing expense 16,908 14,476 13,395
Survey and analysis expense 4,797 4,634 4,359
Membership fee 13,699 12,606 9,604
Power purchase 18,269,732 18,307,289 14,264,331
Disclosure - Other selling and administrative expenses      
Accommodation development expenses 53,945 52,822 55,799
Miscellaneous wages 39,794 32,447 32,300
Litigation and filing expenses 21,768 12,853 11,881
Compensation for damages (1,924) 19,193 12,297
Outsourcing expenses 3,293 3,036 2,647
Reward expenses 2,858 2,713 2,786
Overseas market development expenses 1,997 1,361 1,876
Others 28,775 23,772 35,123
Others 2,763,479 2,318,435 4,134,846
General and administrative expenses 2,669,576 2,627,890 2,762,855
Cost of sales 57,779,835 58,207,721 52,098,855
Total expenses, by nature 60,449,411 60,835,611 54,861,710
Selling and administrative expense      
Expenses by nature [Line Items]      
Raw materials used 0 0 0
Salaries 775,204 757,819 735,383
Retirement benefits expense 157,272 65,107 71,094
Welfare and benefit expense 120,463 132,089 179,406
Insurance expense 12,427 12,181 15,414
Depreciation 232,510 214,499 190,245
Amortization of intangible assets 76,547 54,153 44,990
Bad debt expense (12,719) 39,784 126,714
Commission 632,849 714,096 673,740
Advertising expense 34,453 30,894 114,519
Training expense 7,174 6,277 7,027
Vehicle maintenance expense 9,525 10,148 9,998
Publishing expense 3,414 3,307 3,672
Business promotion expense 3,038 2,785 3,700
Rental expense 40,505 42,851 38,380
Telecommunication expense 8,451 23,505 24,916
Transportation expense 865 686 495
Taxes and dues 58,666 46,424 48,395
Expendable supplies expense 6,682 6,166 7,731
Water, light and heating expense 11,867 12,629 10,545
Repairs and maintenance expense 88,576 62,580 63,477
Ordinary development expense 224,463 215,494 211,417
Travel expense 15,652 14,363 16,658
Clothing expense 9,369 10,108 8,410
Survey and analysis expense 848 705 698
Membership fee 969 1,043 1,122
Power purchase 0 0 0
Disclosure - Other selling and administrative expenses      
Accommodation development expenses 53,945 52,822 55,799
Miscellaneous wages 39,794 32,447 32,300
Litigation and filing expenses 21,768 12,853 11,881
Compensation for damages (1,924) 19,193 12,297
Outsourcing expenses 3,293 3,036 2,647
Reward expenses 2,858 2,713 2,786
Overseas market development expenses 1,997 1,361 1,876
Others 28,775 23,772 35,123
Others 150,506 148,197 154,709
General and administrative expenses 2,669,576 2,627,890 2,762,855
Total expenses, by nature 2,669,576 2,627,890 2,762,855
Cost of sales      
Expenses by nature [Line Items]      
Raw materials used 17,084,029 19,537,928 15,924,707
Salaries 3,834,772 3,478,804 3,479,591
Retirement benefits expense 652,467 375,505 397,852
Welfare and benefit expense 443,482 464,483 543,738
Insurance expense 93,702 93,876 90,677
Depreciation 10,734,246 9,683,887 9,461,974
Amortization of intangible assets 80,368 64,785 68,682
Bad debt expense 0 0 0
Commission 378,861 475,188 469,695
Advertising expense 9,852 9,419 10,917
Training expense 16,903 14,096 14,362
Vehicle maintenance expense 7,652 7,809 7,468
Publishing expense 3,423 3,530 4,248
Business promotion expense 3,981 3,860 4,973
Rental expense 176,413 171,132 148,509
Telecommunication expense 11,034 82,568 73,956
Transportation expense 4,555 4,537 9,145
Taxes and dues 481,684 440,317 437,643
Expendable supplies expense 32,999 31,844 31,994
Water, light and heating expense 32,378 34,640 30,150
Repairs and maintenance expense 2,210,278 2,156,668 2,047,943
Ordinary development expense 511,252 508,394 510,020
Travel expense 68,581 67,064 69,015
Clothing expense 7,539 4,368 4,985
Survey and analysis expense 3,949 3,929 3,661
Membership fee 12,730 11,563 8,482
Power purchase 18,269,732 18,307,289 14,264,331
Disclosure - Other selling and administrative expenses      
Others 2,612,973 2,170,238 3,980,137
Cost of sales 57,779,835 58,207,721 52,098,855
Total expenses, by nature ₩ 57,779,835 ₩ 58,207,721 ₩ 52,098,855