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Reporting Entity (Description of the Controlling Company) - Summary of the Company's Shareholders (Details) - shares
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of shareholders information [Line Items]      
Number of shares 641,964,077 641,964,077 641,964,077
Percentage of ownership 100.00%    
The 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 (KDB)      
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 91,105,897    
Percentage of ownership 14.19%    
Other      
Disclosure of shareholders information [Line Items]      
Number of shares 222,781,122    
Percentage of ownership 34.71%