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Borrowings transactions between related parties (Details) - Korea Development Bank
₩ in Millions
 12 Months Ended
Dec. 31, 2019
KRW (₩)
Facility  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance ₩ 66,793
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 5,700
Repayment (12,648)
Others 0
Ending balance 59,845
Others  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance 4,154
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 0
Repayment (654)
Others 0
Ending balance 3,500
Operating funds  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance 81,000
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 172,442
Repayment (73,992)
Others (450)
Ending balance 179,000
Syndicated Loan  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance 17,277
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 0
Repayment (1,055)
Others 863
Ending balance ₩ 17,085