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Related Parties - Summary of Borrowings Arising From Related Party Transactions (Details) - Korea Development Bank
₩ in Millions
 12 Months Ended
Dec. 31, 2021
KRW (₩)
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance ₩ 253,555
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 206,829
Repayment (112,342)
Others 5,282
Ending balance 353,324
Facility  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance 50,293
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 56,906
Repayment (10,863)
Others 1,684
Ending balance 98,020
Others  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance 2,946
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 0
Repayment (437)
Others 0
Ending balance 2,509
Operating funds  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance 144,300
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 140,000
Repayment (100,000)
Others 0
Ending balance 184,300
Syndicated Loans  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance 15,923
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 0
Repayment (1,042)
Others (351)
Ending balance 14,530
EBL  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance 40,093
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 9,923
Repayment 0
Others 3,949
Ending balance ₩ 53,965