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Finance Lease Liabilities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Finance Lease Liabilities [Line Items]    
Minimum lease payments ₩ 556,276 ₩ 731,788
Present value of minimum lease payments 418,260 541,179
Less than 1 year [Member]    
Finance Lease Liabilities [Line Items]    
Minimum lease payments 174,534 175,512
Present value of minimum lease payments 131,792 121,176
1~5 Years [Member]    
Finance Lease Liabilities [Line Items]    
Minimum lease payments 272,994 404,029
Present value of minimum lease payments 204,069 306,282
More than 5 years [Member]    
Finance Lease Liabilities [Line Items]    
Minimum lease payments 108,748 152,247
Present value of minimum lease payments ₩ 82,399 ₩ 113,721