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Other Financial Assets and Liabilities - Summary of Other Financial Assets and Liabilities (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other financial assets      
Financial assets at fair value through profit or loss ₩ 5,813 ₩ 6,277  
Derivatives used for hedge 7,389 227,318  
Financial instruments 1,333,317 716,769  
Available-for-sale financial assets 380,953 404,774 ₩ 360,037
Held-to-maturity investments 151 30,143  
Less: Non-current (754,992) (664,726)  
Current 972,631 720,555  
Other financial liabilities      
Financial liabilities at fair value through the profit or loss 5,051 1,973  
Derivatives used for hedge 93,770 14,928  
Other financial liabilities 87,669 91,763  
Less: Non-current (149,267) (108,431)  
Current ₩ 37,223 ₩ 233