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Finance Lease Liabilities : Liquidity classification (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Finance Lease Liabilities [Abstract]    
Current finance lease liabilities ₩ 131,792 ₩ 121,176
Non-current finance lease liabilities 286,468 420,003
Total Finance Lease Liabilities ₩ 418,260 ₩ 541,179