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Reporting Entity (Description of the Controlling Company) - Summary of the Company's Shareholders (Details)
Dec. 31, 2023
shares
Disclosure of shareholders information [Line Items]  
Number of shares 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 86,927,104
Percentage of ownership 13.54%
Other  
Disclosure of shareholders information [Line Items]  
Number of shares 226,959,915
Percentage of ownership 35.36%