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Non-financial Liabilities (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure - Other liabilities [Line Items]      
Deferred revenue ₩ 9,868,189 ₩ 9,201,538 ₩ 8,606,563
Other Current Liabilities      
Disclosure - Other liabilities [Line Items]      
Advances received 3,693,043 3,825,240  
Unearned revenue 35,068 30,988  
Deferred revenue 625,596 590,928  
Withholdings 257,059 160,977  
Other nonfincial liabilities 1,360,684 1,080,220  
Total 5,971,450 5,688,353  
Other Noncurrent Liabilities      
Disclosure - Other liabilities [Line Items]      
Advances received 331,596 192,863  
Unearned revenue 6,122 6,589  
Deferred revenue 9,242,593 8,610,610  
Withholdings 9,909 10,901  
Other nonfincial liabilities 71,721 13,489  
Total ₩ 9,661,941 ₩ 8,834,452