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Shareholders Information (Details) - shares
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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 106,414,565    
Percentage of ownership 16.58%    
Other Shareholders      
Disclosure of shareholders information [Line Items]      
Number of shares 207,472,454    
Percentage of ownership 32.32%