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Other Gains (Losses) (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Other gains      
Gains on disposal of property, plant and equipment ₩ 148,667 ₩ 56,284 ₩ 93,195
Gains on disposal of inventories 11,091 4,446 3,373
Gains on disposal of intangible assets 41 1 1,556
Reversal of impairment loss on property, plant and equipment 134,735 0 7,805
Reversal of impairment loss on intangible assets 0 14 0
Gains on proxy collection of TV license fee 42,286 42,271 41,438
Gains on foreign currency translation 36,097 20,598 8,917
Gains on foreign currency transaction 235,221 48,671 61,865
Gains on insurance proceeds 43,497 144 43,800
Miscellaneous Other Gains 294,091 250,174 322,379
Gains on compensation of impaired electric poles 768 812 978
Gains on harbor facilities dues 4,198 3,281 2,231
Gains on technical fees 2,972 3,968 4,826
Reversal of occupation development training fees 525 229 352
Gains on disposal of waste 7,749 4,272 6,927
Gains on insurance 0 690 0
Gains on tax rebate 548 685 772
Gains on other commission 2,097 1,822 1,643
Gains on disposal of assets held-for-sale 236 160 0
Others of Miscellaneous Other Gains 221,621 178,799 259,839
Gains on disposal of greenhouse gas emissions rights 0 8,739 0
Other losses      
Losses on disposal of property, plant and equipment (100,066) (92,622) (162,725)
Losses on disposal of intangible assets (116) (145) (392)
Losses on valuation of other non-current assets 0 0 (241)
Impairment loss on property, plant and equipment (37,311) (4,056) (80,413)
Impairment loss on intangible assets (164) 0 (3,599)
Impairment loss on other non-current assets 0 (16,035) 0
Losses on foreign currency translation (14,738) (4,732) (17,664)
Losses on foreign currency transaction (299,117) (67,990) (49,694)
Miscellaneous Other Losses (197,715) (181,787) (189,695)
Losses on valuation of inventories 14,528 7,761 4,998
Losses on disposal of inventories 8,324 8,874 37,644
Losses due to disaster 5,068 6,238 16,814
Losses on rounding adjustment of electric charge surtax 1,317 1,283 1,276
Others of miscellaneous other losses 168,478 146,349 128,963
Loss on disposal of greenhouse gas emissions rights 0 11,282 0
Total miscellaneous other losses 197,715 181,787 189,695
Net other gains ₩ 243,122 ₩ 8,519 ₩ 35,094