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Borrowings transactions between related parties (Details) - Korea Development Bank
₩ in Millions
 12 Months Ended
Dec. 31, 2020
KRW (₩)
Facility  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance ₩ 59,845
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 0
Repayment (9,552)
Others 0
Ending balance 50,293
Others  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance 3,500
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 0
Repayment (554)
Others 0
Ending balance 2,946
Operating funds  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance 179,000
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 152,961
Repayment (187,511)
Others (150)
Ending balance 144,300
Syndicated Loan  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance 17,085
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 0
Repayment (1,063)
Others (99)
Ending balance 15,923
EBL  
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 43,485
Repayment 0
Others (3,392)
Ending balance ₩ 40,093