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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 ($)
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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

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