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Other-Financial Assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Other Financial Assets [Line Items]    
Loans and receivables ₩ 955,378 ₩ 881,486
Allowance for doubtful accounts (8,948) (4,532)
Present value discount (40,789) (42,747)
Long / short-term financial instruments [Abstract]    
Time deposits 1,479,036 1,850,391
ABCP 210,600 484,400
CP 58,050 16,000
CD 10,000 60,443
RP 11,634 1,521
Others 475,194 283,171
Long / short-term financial instruments 2,244,514 2,695,926
Financial assets at fair value through profit or loss 111,512  
Other financial assets 3,261,667 3,530,133
Other Current Assets [Member]    
Other Financial Assets [Line Items]    
Loans and receivables 244,309 198,133
Present value discount (976) (1,001)
Long / short-term financial instruments [Abstract]    
Time deposits 1,479,034 1,820,391
ABCP 145,000 351,800
CP 58,050 16,000
CD 10,000 60,443
RP 10,000  
Others   32,826
Long / short-term financial instruments 1,702,084 2,281,460
Other financial assets 1,945,417 2,478,592
Other Noncurrent Assets [Member]    
Other Financial Assets [Line Items]    
Loans and receivables 711,069 683,353
Allowance for doubtful accounts (8,948) (4,532)
Present value discount (39,813) (41,746)
Long / short-term financial instruments [Abstract]    
Time deposits 2 30,000
ABCP 65,600 132,600
RP 1,634 1,521
Others 475,194 250,345
Long / short-term financial instruments 542,430 414,466
Financial assets at fair value through profit or loss 111,512  
Other financial assets ₩ 1,316,250 ₩ 1,051,541