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Non-financial Liabilities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Other Current Liabilities [Member]    
Disclosure - Other liabilities [Line Items]    
Advances received ₩ 3,772,713 ₩ 4,498,739
Accrued income 41,593 26,084
Deferred revenue 476,631 445,018
Withholdings 164,370 263,263
Other nonfincial liabilities 1,129,001 1,135,106
Total 5,584,308 6,368,210
Other Noncurrent Liabilities [Member]    
Disclosure - Other liabilities [Line Items]    
Advances received 181,612 148,404
Accrued income 19,718 41,936
Deferred revenue 7,848,550 7,380,747
Withholdings 10,529 10,781
Other nonfincial liabilities 12,025 9,737
Total ₩ 8,072,434 ₩ 7,591,605