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Expenses by nature (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Expenses by nature [Line Items]      
Raw materials used ₩ 19,537,928 ₩ 15,924,707 ₩ 13,470,586
Salaries 4,236,623 4,214,974 4,160,642
Employee benefits expense 440,612 468,946 447,638
Welfare and benefit expense 596,572 723,144 669,934
Insurance expense 106,057 106,091 91,500
Depreciation 9,898,386 9,652,219 8,873,956
Amortization of intangible assets 118,938 113,672 79,715
Bad debt expense 39,784 126,714 38,719
Commission 1,189,284 1,143,435 1,029,058
Advertising expense 40,313 125,436 44,351
Training expense 20,373 21,389 19,661
Vehicle maintenance expense 17,957 17,466 17,406
Publishing expense 6,837 7,920 8,258
Business promotion expense 6,645 8,673 8,313
Rental expense 213,983 186,889 173,690
Telecommunication expense 106,073 98,872 101,373
Transportation expense 5,223 9,640 5,749
Taxes and dues 486,741 486,038 511,493
Expendable supplies expense 38,010 39,725 41,502
Water, light and heating expense 47,269 40,695 35,540
Repairs and maintenance expense 2,219,248 2,111,420 1,971,778
Ordinary development expense 723,888 721,437 705,504
Travel expense 81,427 85,673 79,726
Clothing expense 14,476 13,395 13,636
Survey and analysis expense 4,634 4,359 3,875
Membership fee 12,606 9,604 9,846
Power purchase 18,307,289 14,264,331 10,755,739
Disclosure - Other selling and administrative expenses      
Accommodation development expenses 52,822 55,799 186,896
Miscellaneous wages 32,447 32,300 31,907
Litigation and filing expenses 12,853 11,881 12,328
Compensation for damages 19,193 12,297 60,341
Outsourcing expenses 3,036 2,647 3,530
Reward expenses 2,713 2,786 3,267
Overseas market development expenses 1,361 1,876 2,177
Others 23,772 35,123 31,086
Others 2,318,435 4,134,846 4,819,597
General and administrative expenses 2,627,890 2,762,855 2,639,232
Cost of sales 58,207,721 52,098,855 45,549,553
Total expenses, by nature 60,835,611 54,861,710 48,188,785
Selling and administrative expense      
Expenses by nature [Line Items]      
Raw materials used 0 0  
Salaries 757,819 735,383 734,930
Employee benefits expense 65,107 71,094 72,812
Welfare and benefit expense 132,089 179,406 162,243
Insurance expense 12,181 15,414 11,513
Depreciation 214,499 190,245 169,431
Amortization of intangible assets 54,153 44,990 35,171
Bad debt expense 39,784 126,714 38,719
Commission 714,096 673,740 605,879
Advertising expense 30,894 114,519 34,658
Training expense 6,277 7,027 6,314
Vehicle maintenance expense 10,148 9,998 10,390
Publishing expense 3,307 3,672 3,643
Business promotion expense 2,785 3,700 3,477
Rental expense 42,851 38,380 40,020
Telecommunication expense 23,505 24,916 25,448
Transportation expense 686 495 596
Taxes and dues 46,424 48,395 46,531
Expendable supplies expense 6,166 7,731 6,834
Water, light and heating expense 12,629 10,545 9,720
Repairs and maintenance expense 62,580 63,477 75,122
Ordinary development expense 215,494 211,417 188,063
Travel expense 14,363 16,658 16,115
Clothing expense 10,108 8,410 8,273
Survey and analysis expense 705 698 666
Membership fee 1,043 1,122 1,132
Power purchase 0 0 0
Disclosure - Other selling and administrative expenses      
Accommodation development expenses 52,822 55,799 186,896
Miscellaneous wages 32,447 32,300 31,907
Litigation and filing expenses 12,853 11,881 12,328
Compensation for damages 19,193 12,297 60,341
Outsourcing expenses 3,036 2,647 3,530
Reward expenses 2,713 2,786 3,267
Overseas market development expenses 1,361 1,876 2,177
Others 23,772 35,123 31,086
Others 148,197 154,709 331,532
General and administrative expenses 2,627,890 2,762,855 2,639,232
Total expenses, by nature 2,627,890 2,762,855 2,639,232
Cost of sales      
Expenses by nature [Line Items]      
Raw materials used 19,537,928 15,924,707 13,470,586
Salaries 3,478,804 3,479,591 3,425,712
Employee benefits expense 375,505 397,852 374,826
Welfare and benefit expense 464,483 543,738 507,691
Insurance expense 93,876 90,677 79,987
Depreciation 9,683,887 9,461,974 8,704,525
Amortization of intangible assets 64,785 68,682 44,544
Bad debt expense 0 0 0
Commission 475,188 469,695 423,179
Advertising expense 9,419 10,917 9,693
Training expense 14,096 14,362 13,347
Vehicle maintenance expense 7,809 7,468 7,016
Publishing expense 3,530 4,248 4,615
Business promotion expense 3,860 4,973 4,836
Rental expense 171,132 148,509 133,670
Telecommunication expense 82,568 73,956 75,925
Transportation expense 4,537 9,145 5,153
Taxes and dues 440,317 437,643 464,962
Expendable supplies expense 31,844 31,994 34,668
Water, light and heating expense 34,640 30,150 25,820
Repairs and maintenance expense 2,156,668 2,047,943 1,896,656
Ordinary development expense 508,394 510,020 517,441
Travel expense 67,064 69,015 63,611
Clothing expense 4,368 4,985 5,363
Survey and analysis expense 3,929 3,661 3,209
Membership fee 11,563 8,482 8,714
Power purchase 18,307,289 14,264,331 10,755,739
Disclosure - Other selling and administrative expenses      
Others 2,170,238 3,980,137 4,488,065
Cost of sales 58,207,721 52,098,855 45,549,553
Total expenses, by nature ₩ 58,207,721 ₩ 52,098,855 ₩ 45,549,553