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Other Gains (Losses) (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Other gains      
Gains on disposal of property, plant and equipment ₩ 85,990 ₩ 32,196 ₩ 148,667
Gains on disposal of inventories 18,789 20,447 11,091
Gains on disposal of intangible assets 41 136 41
Reversal of impairment loss on other current assets 0 16,035 0
Gains on proxy collection of TV license fee 33,191 41,372 42,286
Reversal of impairment loss on property, plant and equipment 0 0 134,735
Gains on foreign currency translation 77,269 27,123 36,097
Gains on foreign currency transaction 74,520 139,077 235,221
Gains on insurance proceeds 3,411 6,785 43,497
Miscellaneous Other Gains 273,745 346,795 294,091
Gains on compensation of impaired electric poles 688 1,138 768
Gains on harbor facilities dues 3,710 3,666 4,198
Gains on technical fees 1,836 3,071 2,972
Reversal of occupation development training fees 1,466 1,452 525
Gains on disposal of waste 2,950 3,815 7,749
Gains on tax rebate 206 374 548
Gains on other commission 1,945 2,044 2,097
Gains on disposal of assets held-for-sale 0 0 236
Others of Miscellaneous Other Gains 208,964 269,416 221,621
Other losses      
Losses on disposal of property, plant and equipment (112,018) (98,120) (100,066)
Losses on disposal of intangible assets (111) (71) (116)
Losses on valuation of other non-current assets (29,225) (3,901) (14,738)
Impairment loss on property, plant and equipment (11,240) (17,031) (37,311)
Impairment loss on intangible assets (902) (2,865) (164)
Losses on foreign currency translation (148,381) (165,187) (299,117)
Miscellaneous Other Losses (128,215) (258,286) (197,715)
Losses on valuation of inventories 9,941 9,936 14,528
Losses on disposal of inventories 15,494 5,471 8,324
Losses due to disaster 5,761 7,138 5,068
Losses on rounding adjustment of electric charge surtax 1,351 1,332 1,317
Others of miscellaneous other losses 95,668 234,409 168,478
Total miscellaneous other losses 128,215 258,286 197,715
Net other gains ₩ 84,884 ₩ 22,686 ₩ 243,122