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Trade and Other Receivables - Other receivables (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2018
Dec. 31, 2017
Trade and Other Receivables [Line Items]    
Trade receivables ₩ 7,502,067 ₩ 7,774,479
Other receivables 2,111,370 1,909,290
Gross amount    
Trade and Other Receivables [Line Items]    
Trade receivables 7,718,383 7,948,476
Other receivables 2,225,024 1,995,195
Current    
Trade and Other Receivables [Line Items]    
Trade receivables 7,419,648 7,698,604
Other receivables 2,075,601 1,810,075
Less than 60 days    
Trade and Other Receivables [Line Items]    
Trade receivables 0 7,117
Other receivables 0 47,532
Trade and Other receivables: (impairment reviewed)    
Trade and Other Receivables [Line Items]    
Trade receivables 298,735 242,755
Other receivables 149,423 137,588
Less than 60 days    
Trade and Other Receivables [Line Items]    
Trade receivables 2,525 0
Other receivables 24,782 0
60 ~ 90 days    
Trade and Other Receivables [Line Items]    
Trade receivables 37,266 39,070
Other receivables 1,007 44
90 ~ 120 days    
Trade and Other Receivables [Line Items]    
Trade receivables 16,033 17,502
Other receivables 10,997 1,017
120 days ~ 1year    
Trade and Other Receivables [Line Items]    
Trade receivables 46,204 55,242
Other receivables 23,991 11,042
Over 1 year    
Trade and Other Receivables [Line Items]    
Trade receivables 196,707 130,941
Other receivables 88,646 125,485
Allowance for doubtful accounts    
Trade and Other Receivables [Line Items]    
Trade receivables (215,868) (173,583)
Other receivables (104,726) (78,008)
Less: Present value discount    
Trade and Other Receivables [Line Items]    
Trade receivables (448) (414)
Other receivables ₩ (8,928) ₩ (7,897)