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Derivatives transactions between related parties (Details) - 12 months ended Dec. 31, 2018 - Korea Development Bank
$ in Thousands, ₩ in Millions
KRW (₩)
USD ($)
Cross Currency Interest Rate Contract    
Disclosure of Derivatives transactions between related parties [Line Items]    
Contract year 2016~2019 2016~2019
Pay, Contract Amount | ₩ ₩ 105,260  
Receive, Contract Amount | $   $ 100,000
Contract Interest rate Pay 2.48% 2.48%
Contract Interest rate Receive 2.38% 2.38%
Contract exchange rate 1,052.6 1,052.6
Cross Currency Interest Rate Contract    
Disclosure of Derivatives transactions between related parties [Line Items]    
Contract year 2015~2025 2015~2025
Pay, Contract Amount | ₩ ₩ 111,190  
Receive, Contract Amount | $   $ 100,000
Contract Interest rate Pay 2.62% 2.62%
Contract Interest rate Receive 3.25% 3.25%
Contract exchange rate 1,111.9 1,111.9
Cross Currency Interest Rate Contract    
Disclosure of Derivatives transactions between related parties [Line Items]    
Contract year 2017~2022 2017~2022
Pay, Contract Amount | ₩ ₩ 111,610  
Receive, Contract Amount | $   $ 100,000
Contract Interest rate Pay 2.31% 2.31%
Contract Interest rate Receive 3.13% 3.13%
Contract exchange rate 1,116.1 1,116.1
Cross Currency Interest Rate Contract    
Disclosure of Derivatives transactions between related parties [Line Items]    
Contract year 2017~2020 2017~2020
Pay, Contract Amount | ₩ ₩ 114,580  
Receive, Contract Amount | $   $ 100,000
Contract Interest rate Pay 1.75% 1.75%
Contract Interest rate Receive 2.38% 2.38%
Contract exchange rate 1,145.8 1,145.8
Cross Currency Interest Rate Contract    
Disclosure of Derivatives transactions between related parties [Line Items]    
Contract year 2016~2021 2016~2021
Pay, Contract Amount | ₩ ₩ 121,000  
Receive, Contract Amount | $   $ 100,000
Contract Interest rate Pay 2.15% 2.15%
Contract Interest rate Receive 2.50% 2.50%
Contract exchange rate 1,210 1,210
Cross Currency Interest Rate Contract    
Disclosure of Derivatives transactions between related parties [Line Items]    
Contract year 2017~2022 2017~2022
Pay, Contract Amount | ₩ ₩ 113,300  
Receive, Contract Amount | $   $ 100,000
Contract Interest rate Pay 19.4% 19.4%
Contract Interest rate Receive 2.63% 2.63%
Contract exchange rate 1,133 1,133
Cross Currency Interest Rate Contract    
Disclosure of Derivatives transactions between related parties [Line Items]    
Contract year 2018~2028 2018~2028
Pay, Contract Amount | ₩ ₩ 108,600  
Receive, Contract Amount | $   $ 800,000
Contract Interest rate Pay 2.69% 2.69%
Contract Interest rate Receive 3.35% 3.35%
Contract exchange rate 135.75 135.75
Cross Currency Interest Rate Contract    
Disclosure of Derivatives transactions between related parties [Line Items]    
Contract year 2018~2023 2018~2023
Pay, Contract Amount | ₩ ₩ 170,280  
Receive, Contract Amount | $   $ 150,000
Contract Interest rate Pay 2.15% 2.15%
Contract Interest rate Receive 3.75% 3.75%
Contract exchange rate 1,135.2 1,135.2
Cross Currency Interest Rate Contract    
Disclosure of Derivatives transactions between related parties [Line Items]    
Contract year 2018~2023 2018~2023
Pay, Contract Amount | ₩ ₩ 320,880  
Receive, Contract Amount | $   $ 300,000
Contract Interest rate Pay 2.03% 2.03%
Contract Interest rate Receive 3.75% 3.75%
Contract exchange rate 1,069.6 1,069.6
Cross Currency Interest Rate Contract    
Disclosure of Derivatives transactions between related parties [Line Items]    
Contract year 2018~2021 2018~2021
Pay, Contract Amount | ₩ ₩ 212,960  
Receive, Contract Amount | $   $ 200,000
Contract Interest rate Pay 2.10% 2.10%
Contract Interest rate Receive 3.00% 3.00%
Contract exchange rate 1,064.8 1,064.8
Cross Currency Interest Rate Contract    
Disclosure of Derivatives transactions between related parties [Line Items]    
Contract year 2018~2021 2018~2021
Pay, Contract Amount | ₩ ₩ 169,335  
Receive, Contract Amount | $   $ 150,000
Contract Interest rate Pay 2.26% 2.26%
Contract Interest rate Receive 3.88% 3.88%
Contract exchange rate 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
Contract date Dec. 27, 2017 Dec. 27, 2017
Matrurity date Jul. 12, 2021 Jul. 12, 2021
Cross Currency Forward Contract    
Disclosure of Derivatives transactions between related parties [Line Items]    
Pay, Contract Amount | ₩ ₩ 11,279  
Receive, Contract Amount | $   $ 10,000
Contract exchange rate 1,127.85 1,127.85
Contract date Dec. 18, 2018 Dec. 18, 2018
Matrurity date Jan. 22, 2019 Jan. 22, 2019
Cross Currency Forward Contract    
Disclosure of Derivatives transactions between related parties [Line Items]    
Pay, Contract Amount | ₩ ₩ 4,490  
Receive, Contract Amount | $   $ 4,000
Contract exchange rate 1,122.6 1,122.6
Contract date Dec. 13, 2018 Dec. 13, 2018
Matrurity date Jan. 10, 2019 Jan. 10, 2019
Cross Currency Forward Contract    
Disclosure of Derivatives transactions between related parties [Line Items]    
Pay, Contract Amount | ₩ ₩ 13,497  
Receive, Contract Amount | $   $ 12,000
Contract exchange rate 1,124.74 1,124.74
Contract date Dec. 24, 2018 Dec. 24, 2018
Matrurity date Jan. 10, 2019 Jan. 10, 2019
Cross Currency Forward Contract    
Disclosure of Derivatives transactions between related parties [Line Items]    
Pay, Contract Amount | ₩ ₩ 10,103  
Receive, Contract Amount | $   $ 9,000
Contract exchange rate 1,122.5 1,122.5
Contract date Dec. 21, 2018 Dec. 21, 2018
Matrurity date Jan. 15, 2019 Jan. 15, 2019
Cross Currency Forward Contract    
Disclosure of Derivatives transactions between related parties [Line Items]    
Pay, Contract Amount | ₩ ₩ 11,207  
Receive, Contract Amount | $   $ 10,000
Contract exchange rate 1,120.68 1,120.68
Contract date Dec. 27, 2018 Dec. 27, 2018
Matrurity date Jan. 23, 2019 Jan. 23, 2019
Cross Currency Forward Contract    
Disclosure of Derivatives transactions between related parties [Line Items]    
Pay, Contract Amount | ₩ ₩ 13,412  
Receive, Contract Amount | $   $ 12,000
Contract exchange rate 1,117.64 1,117.64
Contract date Dec. 28, 2018 Dec. 28, 2018
Matrurity date Jan. 23, 2019 Jan. 23, 2019