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Finance Lease Liabilities : Lease payments recognized as an expense from a lessee position (Details) - KRW (₩)
₩ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Lease and sublease payments recognised as expense [Abstract]    
Minimum lease payment ₩ 158,859 ₩ 177,585
Contingent rent payment ₩ (21,024) ₩ (20,956)