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Finance Lease Liabilities : Liquidity classification (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Finance Lease Liabilities [Abstract]    
Current finance lease liabilities ₩ 57,200 ₩ 131,792
Non-current finance lease liabilities 226,606 286,468
Total Finance Lease Liabilities ₩ 283,806 ₩ 418,260