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Borrowings transactions between related parties (Details) - Korea Development Bank
₩ in Millions
 12 Months Ended
Dec. 31, 2018
KRW (₩)
Facility  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance ₩ 93,883
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 1,200
Repayment (28,290)
Others 0
Ending balance 66,793
Others  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance 4,909
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 0
Repayment (755)
Others 0
Ending balance 4,154
Operating funds  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance 61,000
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 32,000
Repayment (12,000)
Others 0
Ending balance 81,000
Syndicated Loan  
Disclosure of Borrowings transactions between related parties [Line Items]  
Beginning balance 16,301
Changes in Borrowings transactions between related parties [Abstract]  
Borrowings 0
Repayment (1,250)
Others 1,100
Ending balance ₩ 17,276