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Classification of Financial Instruments - Classification of financial assets (Details) - KRW (₩)
₩ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Disclosure of Classification by categories of financial assets [Line Items]        
Cash and cash equivalents ₩ 2,369,739 ₩ 3,051,353 ₩ 3,783,065 ₩ 1,796,300
Categories of current financial assets [Abstract]        
Held-to-maturity investments 5 114    
Derivative assets 12,935 193,283    
Other financial assets 1,945,417 2,478,592    
Trade and other receivables 7,928,972 7,788,876    
Total current financial assets And Cash and cash equivalents 12,257,068 13,512,218    
Non-Financial Assets [Abstract]        
Available-for-sale financial assets 699,833 1,014,732    
Held-to-maturity investments 3,139 3,130    
Derivative assets 19,691 588,091    
Other financial assets 1,316,250 1,051,541    
Trade and other receivables 1,754,797 1,903,515    
Total non-current financial assets 3,793,710 4,561,009    
Total financial assets 16,050,778 18,073,227    
Financial assets at fair value through profit or loss [Member]        
Categories of current financial assets [Abstract]        
Derivative assets 12,923 79,709    
Total current financial assets And Cash and cash equivalents 12,923 79,709    
Non-Financial Assets [Abstract]        
Derivative assets 9,097 287,768    
Other financial assets 111,512      
Total non-current financial assets 120,609 287,768    
Total financial assets 133,532 367,477    
Loans and receivables [Member]        
Disclosure of Classification by categories of financial assets [Line Items]        
Cash and cash equivalents 2,369,739 3,051,353    
Categories of current financial assets [Abstract]        
Other financial assets 1,945,417 2,478,592    
Trade and other receivables 7,928,972 7,788,876    
Total current financial assets And Cash and cash equivalents 12,244,128 13,318,821    
Non-Financial Assets [Abstract]        
Other financial assets 1,204,738 1,051,541    
Trade and other receivables 1,754,797 1,903,515    
Total non-current financial assets 2,959,535 2,955,056    
Total financial assets 15,203,663 16,273,877    
Financial assets available-for-sale [Member]        
Non-Financial Assets [Abstract]        
Available-for-sale financial assets 699,833 1,014,732    
Total non-current financial assets 699,833 1,014,732    
Total financial assets 699,833 1,014,732    
Held-to-maturity investments [Member]        
Categories of current financial assets [Abstract]        
Held-to-maturity investments 5 114    
Total current financial assets And Cash and cash equivalents 5 114    
Non-Financial Assets [Abstract]        
Held-to-maturity investments 3,139 3,130    
Total non-current financial assets 3,139 3,130    
Total financial assets 3,144 3,244    
Derivative assets (using hedge accounting) [Member]        
Categories of current financial assets [Abstract]        
Derivative assets 12 113,574    
Total current financial assets And Cash and cash equivalents 12 113,574    
Non-Financial Assets [Abstract]        
Derivative assets 10,594 300,323    
Total non-current financial assets 10,594 300,323    
Total financial assets ₩ 10,606 ₩ 413,897