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Trade and Other Receivables - Other receivables (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Trade and Other Receivables [Line Items]    
Trade receivables ₩ 7,774,479 ₩ 7,679,751
Other receivables 1,909,290 2,012,640
Gross amount [Member]    
Trade and Other Receivables [Line Items]    
Trade receivables 7,948,476 7,751,736
Other receivables 1,995,195 2,108,642
Current [Member]    
Trade and Other Receivables [Line Items]    
Trade receivables 7,698,604 7,592,363
Other receivables 1,810,075 1,887,620
Less than 60 days [Member]    
Trade and Other Receivables [Line Items]    
Trade receivables 7,117 820
Other receivables 47,532 46,887
Trade and Other receivables: (impairment reviewed) [Member]    
Trade and Other Receivables [Line Items]    
Trade receivables 242,755 158,553
Other receivables 137,588 174,135
60 ~ 90 days [Member]    
Trade and Other Receivables [Line Items]    
Trade receivables 39,070 44,277
Other receivables 44 7,352
90 ~ 120 days [Member]    
Trade and Other Receivables [Line Items]    
Trade receivables 17,502 18,917
Other receivables 1,017 2,160
120 days ~ 1year [Member]    
Trade and Other Receivables [Line Items]    
Trade receivables 55,242 42,534
Other receivables 11,042 17,613
Over 1 year [Member]    
Trade and Other Receivables [Line Items]    
Trade receivables 130,941 52,825
Other receivables 125,485 147,010
Less: Allowance for doubtful accounts [Member]    
Trade and Other Receivables [Line Items]    
Trade receivables (173,583) (71,985)
Other receivables (78,008) (87,661)
Less: Present value discount [Member]    
Trade and Other Receivables [Line Items]    
Trade receivables (414)  
Other receivables ₩ (7,897) ₩ (8,341)