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Other Gains (Losses) (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Other gains      
Gains on disposal of property, plant and equipment ₩ 56,284 ₩ 93,195 ₩ 43,784
Gains on disposal of inventories 4,446 3,373 3,424
Gains on disposal of intangible assets 1 1,556 206
Reversal of impairment loss on property, plant and equipment 0 7,805 16,692
Reversal of impairment loss on intangible assets 14 0 0
Gains on proxy collection of TV license fee 42,271 41,438 41,013
Gains on foreign currency translation 20,598 8,917 16,340
Gains on foreign currency transaction 48,671 61,865 53,152
Gains on insurance proceeds 144 43,800 17,410
Miscellaneous Other Gains 250,174 322,379 238,688
Gains on compensation of impaired electric poles 812 978 1,372
Gains on harbor facilities dues 3,281 2,231 3,741
Gains on technical fees 3,968 4,826 3,044
Reversal of occupation development training fees 229 352 1,472
Gains on disposal of waste 4,272 6,927 5,317
Gains on insurance 690 0 812
Gains on tax rebate 685 772 341
Gains on other commission 1,822 1,643 1,111
Gains on disposal of assets held-for-sale 160 0 23,778
Others of Miscellaneous Other Gains 178,799 259,839 153,263
Gains on disposal of greenhouse gas emissions rights 8,739 0 0
Other losses      
Losses on disposal of property, plant and equipment (92,622) (162,725) (72,508)
Losses on disposal of intangible assets (145) (392) (827)
Losses on valuation of other non-current assets 0 (241) 0
Impairment loss on property, plant and equipment (4,056) (80,413) (50,034)
Impairment loss on intangible assets 0 (3,599) (513,609)
Impairment loss on other non-current assets (16,035) 0 (49,620)
Losses on foreign currency translation (4,732) (17,664) (8,757)
Losses on foreign currency transaction (67,990) (49,694) (55,283)
Miscellaneous Other Losses (181,787) (189,695) (217,892)
Losses on valuation of inventories 7,761 4,998 3,127
Losses on disposal of inventories 8,874 37,644 10,456
Losses due to disaster 6,238 16,814 7,635
Losses on rounding adjustment of electric charge surtax 1,283 1,276 1,268
Others of miscellaneous other losses 146,349 128,963 195,406
Loss on disposal of greenhouse gas emissions rights 11,282    
Total miscellaneous other losses 181,787 189,695 217,892
Net other gains ₩ 8,519 ₩ 35,094 ₩ (582,258)