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Derivatives transactions between related parties (Details) - 12 months ended Dec. 31, 2019 - Korea Development Bank
SFr in Thousands, $ in Thousands, $ in Thousands, ₩ in Millions
KRW (₩)
USD ($)
CHF (SFr)
HKD ($)
Cross Currency Interest Rate Contract        
Disclosure of Derivatives transactions between related parties [Line Items]        
Contract year 2019~2024 2019~2024 2019~2024 2019~2024
Pay, Contract Amount ₩ 177,600      
Receive, Contract Amount | $   $ 150,000    
Contract Interest rate Pay 1.24% 1.24% 1.24% 1.24%
Contract Interest rate Receive 2.50% 2.50% 2.50% 2.50%
Contract exchange rate 1,184.00 1,184.00 1,184.00 1,184.00
Cross Currency Interest Rate Contract        
Disclosure of Derivatives transactions between related parties [Line Items]        
Contract year 2015~2025 2015~2025 2015~2025 2015~2025
Pay, Contract Amount ₩ 111,190      
Receive, Contract Amount | $   $ 100,000    
Contract Interest rate Pay 2.62% 2.62% 2.62% 2.62%
Contract Interest rate Receive 3.25% 3.25% 3.25% 3.25%
Contract exchange rate 1,111.90 1,111.90 1,111.90 1,111.90
Cross Currency Interest Rate Contract        
Disclosure of Derivatives transactions between related parties [Line Items]        
Contract year 2017~2027 2017~2027 2017~2027 2017~2027
Pay, Contract Amount ₩ 111,610      
Receive, Contract Amount | $   $ 100,000    
Contract Interest rate Pay 2.31% 2.31% 2.31% 2.31%
Contract Interest rate Receive 3.13% 3.13% 3.13% 3.13%
Contract exchange rate 1,116.10 1,116.10 1,116.10 1,116.10
Cross Currency Interest Rate Contract        
Disclosure of Derivatives transactions between related parties [Line Items]        
Contract year 2018~2028 2018~2028 2018~2028 2018~2028
Pay, Contract Amount ₩ 108,600      
Receive, Contract Amount | $       $ 800,000
Contract Interest rate Pay 2.69% 2.69% 2.69% 2.69%
Contract Interest rate Receive 3.35% 3.35% 3.35% 3.35%
Contract exchange rate 135.75 135.75 135.75 135.75
Cross Currency Interest Rate Contract        
Disclosure of Derivatives transactions between related parties [Line Items]        
Contract year 2018~2023 2018~2023 2018~2023 2018~2023
Pay, Contract Amount ₩ 170,280      
Receive, Contract Amount | $   $ 150,000    
Contract Interest rate Pay 2.15% 2.15% 2.15% 2.15%
Contract Interest rate Receive 3.75% 3.75% 3.75% 3.75%
Contract exchange rate 1,135.20 1,135.20 1,135.20 1,135.20
Cross Currency Interest Rate Contract        
Disclosure of Derivatives transactions between related parties [Line Items]        
Contract year 2019~2027 2019~2027 2019~2027 2019~2027
Pay, Contract Amount ₩ 119,978      
Receive, Contract Amount | SFr     SFr 100,000  
Contract Interest rate Pay 1.43% 1.43% 1.43% 1.43%
Contract Interest rate Receive 0.05% 0.05% 0.05% 0.05%
Contract exchange rate 1,199.78 1,199.78 1,199.78 1,199.78
Cross Currency Interest Rate Contract        
Disclosure of Derivatives transactions between related parties [Line Items]        
Contract year 2017~2020 2017~2020 2017~2020 2017~2020
Pay, Contract Amount ₩ 114,580      
Receive, Contract Amount | $   $ 100,000    
Contract Interest rate Pay 1.75% 1.75% 1.75% 1.75%
Contract Interest rate Receive 2.38% 2.38% 2.38% 2.38%
Contract exchange rate 1,145.80 1,145.80 1,145.80 1,145.80
Cross Currency Interest Rate Contract        
Disclosure of Derivatives transactions between related parties [Line Items]        
Contract year 2016~2021 2016~2021 2016~2021 2016~2021
Pay, Contract Amount ₩ 121,000      
Receive, Contract Amount | $   $ 100,000    
Contract Interest rate Pay 2.15% 2.15% 2.15% 2.15%
Contract Interest rate Receive 2.50% 2.50% 2.50% 2.50%
Contract exchange rate 1,210.00 1,210.00 1,210.00 1,210.00
Cross Currency Interest Rate Contract        
Disclosure of Derivatives transactions between related parties [Line Items]        
Contract year 2019~2022 2019~2022 2019~2022 2019~2022
Pay, Contract Amount ₩ 112,650      
Receive, Contract Amount | $   $ 100,000    
Contract Interest rate Pay 1.80% 1.80% 1.80% 1.80%
Contract Interest rate Receive 3.38% 3.38% 3.38% 3.38%
Contract exchange rate 1,126.50 1,126.50 1,126.50 1,126.50
Cross Currency Interest Rate Contract        
Disclosure of Derivatives transactions between related parties [Line Items]        
Contract year 2018~2023 2018~2023 2018~2023 2018~2023
Pay, Contract Amount ₩ 320,880      
Receive, Contract Amount | $   $ 300,000    
Contract Interest rate Pay 2.03% 2.03% 2.03% 2.03%
Contract Interest rate Receive 3.75% 3.75% 3.75% 3.75%
Contract exchange rate 1,069.6 1,069.6 1,069.6 1,069.6
Cross Currency Interest Rate Contract        
Disclosure of Derivatives transactions between related parties [Line Items]        
Contract year 2019~2022 2019~2022 2019~2022 2019~2022
Pay, Contract Amount ₩ 117,340      
Receive, Contract Amount | $   $ 100,000    
Contract Interest rate Pay 1.06% 1.06% 1.06% 1.06%
Contract Interest rate Receive 2.38% 2.38% 2.38% 2.38%
Contract exchange rate 1,173.40 1,173.40 1,173.40 1,173.40
Cross Currency Interest Rate Contract        
Disclosure of Derivatives transactions between related parties [Line Items]        
Contract year 2018~2021 2018~2021 2018~2021 2018~2021
Pay, Contract Amount ₩ 212,960      
Receive, Contract Amount | $   $ 200,000    
Contract Interest rate Pay 2.10% 2.10% 2.10% 2.10%
Contract Interest rate Receive 3.00% 3.00% 3.00% 3.00%
Contract exchange rate 1,064.8 1,064.8 1,064.8 1,064.8
Cross Currency Interest Rate Contract        
Disclosure of Derivatives transactions between related parties [Line Items]        
Contract year 2017~2022 2017~2022 2017~2022 2017~2022
Pay, Contract Amount ₩ 113,300      
Receive, Contract Amount | $   $ 100,000    
Contract Interest rate Pay 1.94% 1.94% 1.94% 1.94%
Contract Interest rate Receive 2.63% 2.63% 2.63% 2.63%
Contract exchange rate 1,133 1,133 1,133 1,133
Cross Currency Interest Rate Contract        
Disclosure of Derivatives transactions between related parties [Line Items]        
Contract year 2018~2021 2018~2021 2018~2021 2018~2021
Pay, Contract Amount ₩ 169,335      
Receive, Contract Amount | $   $ 150,000    
Contract Interest rate Pay 2.26% 2.26% 2.26% 2.26%
Contract Interest rate Receive 3.88% 3.88% 3.88% 3.88%
Contract exchange rate 1,128.9 1,128.9 1,128.9 1,128.9
Cross Currency Forward Contract        
Disclosure of Derivatives transactions between related parties [Line Items]        
Pay, Contract Amount ₩ 104,849      
Receive, Contract Amount | $   $ 100,000    
Contract exchange rate 1,048.49 1,048.49 1,048.49 1,048.49
Contract date Dec. 27, 2017 Dec. 27, 2017 Dec. 27, 2017 Dec. 27, 2017
Matrurity date Jul. 12, 2021 Jul. 12, 2021 Jul. 12, 2021 Jul. 12, 2021
Cross Currency Forward Contract        
Disclosure of Derivatives transactions between related parties [Line Items]        
Pay, Contract Amount ₩ 11,925      
Receive, Contract Amount | $   $ 10,000    
Contract exchange rate 1,192.50 1,192.50 1,192.50 1,192.50
Contract date Dec. 11, 2019 Dec. 11, 2019 Dec. 11, 2019 Dec. 11, 2019
Matrurity date Jan. 15, 2020 Jan. 15, 2020 Jan. 15, 2020 Jan. 15, 2020
Cross Currency Forward Contract        
Disclosure of Derivatives transactions between related parties [Line Items]        
Pay, Contract Amount ₩ 4,630      
Receive, Contract Amount | $   $ 4,000    
Contract exchange rate 1,157.40 1,157.40 1,157.40 1,157.40
Contract date Dec. 30, 2019 Dec. 30, 2019 Dec. 30, 2019 Dec. 30, 2019
Matrurity date Jan. 23, 2020 Jan. 23, 2020 Jan. 23, 2020 Jan. 23, 2020