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Non-financial Liabilities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Other Current Liabilities    
Disclosure - Other liabilities [Line Items]    
Advances received ₩ 3,724,238 ₩ 3,772,713
Accrued income 63,038 41,593
Deferred revenue 556,072 476,631
Withholdings 172,454 164,370
Other nonfincial liabilities 1,058,239 1,129,001
Total 5,574,041 5,584,308
Other Noncurrent Liabilities    
Disclosure - Other liabilities [Line Items]    
Advances received 80,937 181,612
Accrued income 4,690 19,718
Deferred revenue 8,050,491 7,848,550
Withholdings 10,856 10,529
Other nonfincial liabilities 13,059 12,025
Total ₩ 8,160,033 ₩ 8,072,434