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Finance Lease Liabilities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Finance Lease Liabilities [Line Items]    
Minimum lease payments ₩ 381,742 ₩ 556,276
Present value of minimum lease payments 283,806 418,260
Less than 1 year    
Finance Lease Liabilities [Line Items]    
Minimum lease payments 87,709 174,534
Present value of minimum lease payments 57,200 131,792
1~5 Years    
Finance Lease Liabilities [Line Items]    
Minimum lease payments 228,783 272,994
Present value of minimum lease payments 170,676 204,069
More than 5 years    
Finance Lease Liabilities [Line Items]    
Minimum lease payments 65,250 108,748
Present value of minimum lease payments ₩ 55,930 ₩ 82,399