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Trade and Other Receivables - Other receivables (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2019
Dec. 31, 2018
Trade and Other Receivables [Line Items]    
Trade receivables Face value ₩ 7,485,944 ₩ 7,718,383
Trade receivables Allowance for doubtful accounts (212,759) (215,868)
Trade receivables Present value discount (382) (448)
Trade receivables 7,272,803 7,502,067
Other receivables Face value 2,552,077 2,225,024
Other receivables Allowance for doubtful accounts (114,155) (104,726)
Other receivables Present value discount (6,976) (8,928)
Other receivables 2,430,946 2,111,370
Current    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 7,338,757 7,419,648
Other receivables Face value 2,327,640 2,075,601
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 147,187 298,735
Other receivables Face value 224,437 149,423
Less than 60 days    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 6,555 2,525
Other receivables Face value 98,220 24,782
60 ~ 90 days    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 1,899 37,266
Other receivables Face value 2,034 1,007
90 ~ 120 days    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 2,106 16,033
Other receivables Face value 14,135 10,997
120 days ~ 1year    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 37,357 46,204
Other receivables Face value 26,212 23,991
Over 1 year    
Trade and Other Receivables [Line Items]    
Trade receivables Face value 99,270 196,707
Other receivables Face value ₩ 83,836 ₩ 88,646