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Trade and Other Receivables - Other receivables (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2020
Dec. 31, 2019
Gross amount    
Trade and Other Receivables [Line Items]    
Trade receivables Face value ₩ 7,598,184 ₩ 7,485,944
Trade receivables Allowance for doubtful accounts (208,990) (212,759)
Trade receivables Present value discount 0 (382)
Trade receivables 7,389,194 7,272,803
Other receivables Face value 2,528,084 2,552,077
Other receivables Allowance for doubtful accounts (132,379) (114,155)
Other receivables Present value discount (4,860) (6,976)
Other receivables 2,390,845 2,430,946
Current    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 7,274,773 7,338,757
Other receivables Face value 2,363,967 2,327,640
Less than 60 days    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 0 0
Other receivables Face value 0 0
Trade and Other receivables: (impairment reviewed)    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 323,411 147,187
Other receivables Face value 164,117 224,437
Less than 60 days    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 3,505 6,555
Other receivables Face value 46,399 98,220
60 ~ 90 days    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 28,729 1,899
Other receivables Face value 31,183 2,034
90 ~ 120 days    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 10,687 2,106
Other receivables Face value 1,873 14,135
120 days ~ 1year    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 34,036 37,357
Other receivables Face value 11,803 26,212
Over 1 year    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 246,454 99,270
Other receivables Face value ₩ 72,859 ₩ 83,836