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Selling and Administrative Expenses (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Expenses by nature [Line Items]      
Raw materials used ₩ 15,924,707 ₩ 13,470,586 ₩ 14,626,933
Salaries 4,214,974 4,160,642 3,617,908
Employee benefits expense 468,946 447,638 382,603
Welfare and benefit expense 723,144 669,934 546,052
Insurance expense 106,091 91,500 94,546
Depreciation 9,652,219 8,873,956 8,261,751
Amortization of intangible assets 113,672 79,715 72,266
Bad debt expense 126,714 38,719 290
Commission 1,143,435 1,029,058 915,874
Advertising expense 125,436 44,351 38,583
Training expense 21,389 19,661 16,174
Vehicle maintenance expense 17,466 17,406 18,852
Publishing expense 7,920 8,258 7,105
Business promotion expense 8,673 8,313 7,650
Rent expense 186,889 173,690 186,959
Telecommunication expense 98,872 101,373 95,858
Transportation expense 9,640 5,749 6,089
Taxes and dues 486,038 511,493 453,131
Expendable supplies expense 39,725 41,502 37,146
Water, light and heating expense 40,695 35,540 36,428
Repairs and maintenance expense 2,111,420 1,971,778 1,846,090
Ordinary development expense 721,437 705,504 611,220
Travel expense 85,673 79,726 67,298
Clothing expense 13,395 13,636 9,886
Survey and analysis expense 4,359 3,875 3,661
Membership fee 9,604 9,846 7,441
Power purchase 14,264,331 10,755,739 11,428,027
Disclosure - Other selling and administrative expenses [Abstract]      
Accommodation development expenses 55,799 186,896 28,134
Miscellaneous wages 32,300 31,907 43,109
Litigation and filing expenses 11,881 12,328 10,670
Compensation for damages 12,297 60,341 9,032
Outsourcing expenses 2,647 3,530 2,865
Reward expenses 2,786 3,267 2,472
Overseas market development expenses 1,876 2,177 1,541
Others 35,123 31,086 34,037
Others 4,134,846 4,819,597 4,215,169
General and administrative expenses 2,762,855 2,639,232 2,153,261
Cost of sales 52,098,855 45,549,553 45,457,729
Total expenses, by nature 54,861,710 48,188,785 47,610,990
Selling and administrative expense [Member]      
Expenses by nature [Line Items]      
Salaries 735,383 734,930 655,432
Employee benefits expense 71,094 72,812 61,903
Welfare and benefit expense 179,406 162,243 119,866
Insurance expense 15,414 11,513 10,636
Depreciation 190,245 169,431 102,867
Amortization of intangible assets 44,990 35,171 40,465
Bad debt expense 126,714 38,719 290
Commission 673,740 605,879 562,171
Advertising expense 114,519 34,658 30,085
Training expense 7,027 6,314 4,988
Vehicle maintenance expense 9,998 10,390 10,529
Publishing expense 3,672 3,643 3,124
Business promotion expense 3,700 3,477 3,338
Rent expense 38,380 40,020 44,905
Telecommunication expense 24,916 25,448 22,678
Transportation expense 495 596 753
Taxes and dues 48,395 46,531 55,970
Expendable supplies expense 7,731 6,834 7,272
Water, light and heating expense 10,545 9,720 9,558
Repairs and maintenance expense 63,477 75,122 74,330
Ordinary development expense 211,417 188,063 178,472
Travel expense 16,658 16,115 14,388
Clothing expense 8,410 8,273 5,751
Survey and analysis expense 698 666 590
Membership fee 1,122 1,132 1,040
Disclosure - Other selling and administrative expenses [Abstract]      
Accommodation development expenses 55,799 186,896 28,134
Miscellaneous wages 32,300 31,907 43,109
Litigation and filing expenses 11,881 12,328 10,670
Compensation for damages 12,297 60,341 9,032
Outsourcing expenses 2,647 3,530 2,865
Reward expenses 2,786 3,267 2,472
Overseas market development expenses 1,876 2,177 1,541
Others 35,123 31,086 34,037
Others 154,709 331,532 131,860
General and administrative expenses 2,762,855 2,639,232 2,153,261
Total expenses, by nature ₩ 2,762,855 ₩ 2,639,232 ₩ 2,153,261