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Other Gains (Losses) (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Other gains      
Gains on disposal of property, plant and equipment ₩ 43,784 ₩ 98,077 ₩ 48,316
Gains on disposal of intangible assets 206 12 564
Reversal of impairment loss on property, plant and equipment 16,692    
Reversal of impairment loss on intangible assets 0 17 54
Gains on foreign currency translation 16,340 14,905 20,485
Gains on foreign currency transaction 53,152 47,297 93,151
Gains on insurance proceeds 17,410 0 400
Miscellaneous Other Gains 238,688 221,556 269,562
Gains on disposal of inventories 3,424 6,350 6,024
Gains on proxy collection of TV license fee 41,013 40,450 39,711
Gains on compensation of impaired electric poles 1,372 1,166 1,526
Gains on compensation for infringement on contract 0 3,648 18,990
Gains on harbor facilities dues 3,741 3,803 3,025
Gains on technical fees 3,044 2,026 2,105
Reversal of occupation development training fees 1,472 1,602 1,697
Gains on disposal of waste 5,317 4,232 4,261
Gains on insurance 812 22,382 10,410
Gains on tax rebate 341 542 2,161
Gains on other commission 1,111 4,347 4,790
Gains on disposal of assets held-for-sale 23,778    
Others of Miscellaneous Other Gains 153,263 131,008 174,862
Other losses      
Losses on disposal of property, plant and equipment (72,508) (60,704) (70,514)
Losses on disposal of intangible assets (827) (43) (183)
Impairment loss on property, plant and equipment (50,036) [1],[2] (710,164) [3] (51,067)
Impairment loss on intangible assets (513,609) (8,112) (20)
Impairment loss on other non-current assets (49,620) (87,024)  
Losses on foreign currency translation (8,757) (7,678) (25,495)
Losses on foreign currency transaction (55,283) (65,366) (36,241)
Miscellaneous Other Losses (217,892) (63,899) (92,385)
Losses on valuation of inventories 3,127 1,953 3,875
Losses on disposal of inventories 10,456 3,555 3,273
Losses due to disaster 7,635 2,129 5,374
Losses on rounding adjustment of electric charge surtax 1,268 1,265 1,253
Losses on adjustments of levies 0 0 1
Forfeit of taxes and dues 0 0 656
Others Of Miscellaneous Other Losses 195,406 54,997 77,953
Net other gains ₩ (582,258) ₩ (621,124) ₩ 156,627
[1] As described in Note 2, the Company recognized impairment loss of KRW3,819 million related to Wolsong unit 1, Shin-Hanul unit 3 and 4 and reversal of impairment loss of KRW16,693 million related to Wolsong unit 1.
[2] KEPCO Bylong Australia Pty., Ltd., 100% owned subsidiary, performed an impairment test over its land and others. The Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss.
[3] Korea Hydro & Nuclear Power Co., Ltd. And Korea Western Power Co., Ltd., 100% owned subsidiaries, have determined that there are impairment indicators for the shutdowns of certain power generation units and fire, and performed an impairment test over the individual assets. As a result, the Company recognized the amount of the carrying amount in excess of its recoverable amount as an impairment loss in the consolidated statements of comprehensive income.