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Shareholders Information (Details) - shares
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of shareholders information [Line Items]      
Number of shares 641,964,077 641,964,077 641,964,077
Percentage of ownership 100.00%    
Government of the Republic of Korea      
Disclosure of shareholders information [Line Items]      
Number of shares 116,841,794    
Percentage of ownership 18.20%    
Korea Development Bank      
Disclosure of shareholders information [Line Items]      
Number of shares 211,235,264    
Percentage of ownership 32.90%    
Foreign investors      
Disclosure of shareholders information [Line Items]      
Number of shares 173,769,250    
Percentage of ownership 27.07%    
Other Shareholders      
Disclosure of shareholders information [Line Items]      
Number of shares 140,117,769    
Percentage of ownership 21.83%