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Changes in available-for-sale financial assets (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Changes in available-for-sale financial assets [Line Items]    
Beginning balance ₩ 1,014,732  
Acquisition 233,285  
Disposal [1] (461,423)  
Valuation 5,248  
Impairment (2,713) ₩ (86,703)
Others (89,296)  
Ending balance 699,833 1,014,732
Listed equity securities    
Changes in available-for-sale financial assets [Line Items]    
Beginning balance 268,171  
Acquisition 106  
Disposal [1] 0  
Valuation 8,156  
Impairment (97)  
Others (1,883)  
Ending balance 274,453 268,171
Unlisted equity securities    
Changes in available-for-sale financial assets [Line Items]    
Beginning balance 746,561  
Acquisition 233,179  
Disposal [1] (461,423)  
Valuation (2,908)  
Impairment (2,616)  
Others (87,413)  
Ending balance 425,380 [2] 746,561
Current Financial assets at fair value through profit or loss, category    
Changes in available-for-sale financial assets [Line Items]    
Beginning balance 0  
Acquisition 0  
Disposal [1] 0  
Valuation 0  
Impairment 0  
Others 0  
Ending balance 0 0
Non-Current Financial assets at fair value through profit or loss, category    
Changes in available-for-sale financial assets [Line Items]    
Beginning balance 1,014,732  
Acquisition 233,285  
Disposal [1] (461,423)  
Valuation 5,248  
Impairment (2,713)  
Others (89,296)  
Ending balance ₩ 699,833 ₩ 1,014,732
[1] The Company recognized gain and loss on disposal of available-for-sale financial assets amounted to KRW1,130 million and KRW2,343 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] Investments in unlisted equity securities held by the Company for which a quoted market price does not exist in an active market and fair value cannot be measured reliably were measured at cost less impairment, if any.