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Other Financial Assets and Liabilities - Summary of Other Financial Assets and Liabilities (Detail) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Other financial assets      
Financial assets at amortized cost ₩ 484,271 ₩ 1,333,368  
Financial assets at fair value through profit or loss 777,685 5,913  
Financial assets at fair value through other comprehensive income 326,157    
Available-for-sale financial assets   380,953  
Derivative used for hedging 29,843 7,389  
Less: Non-current (623,176) (754,992) ₩ (664,726)
Current 994,780 972,631 720,555
Other financial liabilities      
Financial liabilities at amortized cost 99,330 87,669  
Financial liabilities at fair value through profit or loss 7,758 5,051  
Derivatives used for hedging 57,308 93,771  
Less: Non-current (163,454) (149,267) (108,431)
Current ₩ 942 ₩ 37,224 ₩ 233