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Non-financial Liabilities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Other Current Liabilities    
Disclosure - Other liabilities [Line Items]    
Advances received ₩ 3,825,240 ₩ 3,724,238
Unearned revenue 30,988 63,038
Deferred revenue 590,928 556,072
Withholdings 160,977 172,454
Other nonfincial liabilities 1,080,220 1,058,239
Total 5,688,353 5,574,041
Other Noncurrent Liabilities    
Disclosure - Other liabilities [Line Items]    
Advances received 192,863 80,937
Unearned revenue 6,589 4,690
Deferred revenue 8,610,610 8,050,491
Withholdings 10,901 10,856
Other nonfincial liabilities 13,489 13,059
Total ₩ 8,834,452 ₩ 8,160,033