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Changes in available-for-sale financial assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Changes in available-for-sale financial assets [Line Items]      
Beginning balance ₩ 1,014,732 ₩ 584,479  
Acquisition 233,285 449,484  
Disposal (461,423) [1] (5,226) [2]  
Valuation 5,248 61,793  
Impairment (2,713) (86,703) ₩ (84,370)
Others (89,296) 10,905  
Ending Balance 699,833 1,014,732 584,479
Listed equity securities [Member]      
Changes in available-for-sale financial assets [Line Items]      
Beginning balance 268,171 196,579  
Acquisition 106    
Disposal 0 (3,398) [2]  
Valuation 8,156 74,139  
Impairment (97) (9,122)  
Others (1,883) 9,973  
Ending Balance 274,453 268,171 196,579
Unlisted equity securities [Member]      
Changes in available-for-sale financial assets [Line Items]      
Beginning balance 746,561 387,900  
Acquisition 233,179 449,484  
Disposal (461,423) [1] (1,828) [2]  
Valuation (2,908) (12,346)  
Impairment (2,616) (77,581)  
Others (87,413) 932  
Ending Balance ₩ 425,380 ₩ 746,561 ₩ 387,900
[1] The Company recognized gain and loss on disposal of available-for-sale financial assets amounted to ￦1,130 million and ￦2,343 million, respectively, from the partial sales of Hanwha-KOSEP New Renewable Energy Private Special Assets Investment Trust 1 and others for the year ended December 31, 2017.
[2] The Company recognized gain and loss on disposal of available-for-sale financial assets amounted to ￦1,482 million and ￦9 million, respectively, from the sales of shares of Kwanglim Co., Ltd., TONGYANG Inc., TONGYANG networks Inc., Nexolon Co., Ltd. and SsangYong E&C Co., Ltd. and from the partial sales of IBK-AUCTUS Green Growth Private Equity Firm, Hanwha-KOSEP New Renewable Energy Private Special Assets Investment Trust 1 and Korea investment—Hanwha KT Master Lease Private Special Investment Trust for the year ended December 31, 2016.