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Other Gains (Losses) (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other gains [Abstract]      
Gains on disposal of property, plant and equipment ₩ 48,316 ₩ 74,035 ₩ 8,637,508
Gains on disposal of intangible assets 564   32
Reversal of impairment loss on intangible assets 54 3 275
Gains on foreign currency translation 20,485 15,311 13,784
Gains on foreign currency transaction 93,151 55,377 61,007
Gains on insurance proceeds 400   30
Miscellaneous Other Gains 269,562 187,792 162,128
Gains on disposal of inventories 6,024 9,494 10,758
Gains on valuation of inventories   2 7
Gains on proxy collection of TV license fee 39,711 38,991 38,529
Gains on compensation of impaired electric poles 1,526 3,650  
Gains on compensation for infringement on contract 18,990 3,040 7,414
Gains on harbor facilities dues 3,025 2,957 5,943
Gains on technical fees 2,105 1,271 1,258
Reversal of occupation development training fees 1,697 1,756 1,878
Gains on disposal of waste 4,261 4,222 2,880
Gains on insurance 10,410 3,786 11,865
Gains on litigation     600
Gains on tax rebate 2,161 5,226 1,661
Gains on other commission 4,790 4,639 2,177
Gains on research tasks   10 1,446
Gains on settlement and others   2,188 2,803
Gains on sales of greenhouse gas emissions rights   46 52
Others of Miscellaneous Other Gains 174,862 106,514 72,857
Other losses [Abstract]      
Losses on disposal of property, plant and equipment (70,514) (42,715) (73,073)
Losses on disposal of intangible assets (183) (158) (16)
Impairment loss on property, plant and equipment (51,067)   (30,344)
Impairment loss on intangible assets (20) (3,945) (22)
Losses on foreign currency translation (25,495) (23,835) (15,097)
Losses on foreign currency transaction (36,241) (72,058) (75,615)
Miscellaneous Other Losses (92,385) (119,309) (69,824)
Losses on valuation of inventories 3,875 2,683 1,318
Losses on disposal of inventories 3,273 3,092 13,469
Losses due to disaster 5,374 1,522 263
Losses on rounding adjustment of electric charge surtax 1,253 1,260 1,251
Losses on adjustments of levies 1 1,184 13,928
Forfeit of taxes and dues 656 4,582 190
Losses on litigation   2,581 488
Others Of Miscellaneous Other Losses 77,953 102,405 38,917
Net other gains ₩ 156,627 ₩ 70,498 ₩ 8,610,773