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Other Gains (Losses) (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other gains      
Gains on disposal of property, plant and equipment ₩ 93,195 ₩ 43,784 ₩ 98,077
Gains on disposal of intangible assets 1,556 206 12
Reversal of impairment loss on property, plant and equipment 7,805 16,692 0
Reversal of impairment loss on intangible assets 0 0 17
Gains on foreign currency translation 8,917 16,340 14,905
Gains on foreign currency transaction 61,865 53,152 47,297
Gains on insurance proceeds 43,800 17,410 0
Miscellaneous Other Gains 322,379 238,688 221,556
Gains on disposal of inventories 3,373 3,424 6,350
Gains on proxy collection of TV license fee 41,438 41,013 40,450
Gains on compensation of impaired electric poles 978 1,372 1,166
Gains on compensation for infringement on contract 0 0 3,648
Gains on harbor facilities dues 2,231 3,741 3,803
Gains on technical fees 4,826 3,044 2,026
Reversal of occupation development training fees 352 1,472 1,602
Gains on disposal of waste 6,927 5,317 4,232
Gains on insurance 0 812 22,382
Gains on tax rebate 772 341 542
Gains on other commission 1,643 1,111 4,347
Gains on disposal of assets held-for-sale 0 23,778 0
Others of Miscellaneous Other Gains 259,839 153,263 131,008
Other losses      
Losses on disposal of property, plant and equipment (162,725) (72,508) (60,704)
Losses on disposal of intangible assets (392) (827) (43)
Losses on valuation of other non-current assets (241) 0 0
Impairment loss on property, plant and equipment (80,413) (50,034) (710,162)
Impairment loss on intangible assets (3,599) (513,609) (8,112)
Impairment loss on other non-current assets 0 (49,620) (87,024)
Losses on foreign currency translation (17,664) (8,757) (7,678)
Losses on foreign currency transaction (49,694) (55,283) (65,366)
Miscellaneous Other Losses (189,695) (217,892) (63,899)
Losses on valuation of inventories 4,998 3,127 1,953
Losses on disposal of inventories 37,644 10,456 3,555
Losses due to disaster 16,814 7,635 2,129
Losses on rounding adjustment of electric charge surtax 1,276 1,268 1,265
Others Of Miscellaneous Other Losses 128,963 195,406 54,997
Net other gains ₩ 35,094 ₩ (582,258) ₩ (621,124)