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Shareholders Information (Details) - shares
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
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 [Member]      
Disclosure of shareholders information [Line Items]      
Number of shares 116,841,794    
Percentage of ownership 18.20%    
Korea Development Bank [Member]      
Disclosure of shareholders information [Line Items]      
Number of shares 211,235,264    
Percentage of ownership 32.90%    
Foreign investors [Member]      
Disclosure of shareholders information [Line Items]      
Number of shares 194,050,746    
Percentage of ownership 30.23%    
Other Shareholders [Member]      
Disclosure of shareholders information [Line Items]      
Number of shares 119,836,273    
Percentage of ownership 18.67%