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Derivative Interest rate swap contract List (Details) - 12 months ended Dec. 31, 2018 - Interest rate swap contracts
$ in Thousands, ₩ in Millions
KRW (₩)
USD ($)
Not Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty KEB Hana Bank  
Derivative, Term of Contract 2017~2022  
Contract Interest rate Pay 2.01%  
Contract Interest rate Receive 3M CD+0.24%  
Contract amount | ₩ ₩ 100,000  
Not Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty KEB Hana Bank  
Derivative, Term of Contract 2017~2022  
Contract Interest rate Pay 2.06%  
Contract Interest rate Receive 3M CD+0.27%  
Contract amount | ₩ ₩ 100,000  
Not Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty [1] Nomura  
Derivative, Term of Contract [1] 2017~2037  
Contract Interest rate Pay [1] 2.05%  
Contract Interest rate Receive [1] 3.08%  
Contract amount | ₩ [1] ₩ 30,000  
Not Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty KEB Hana Bank  
Derivative, Term of Contract 2017~2021  
Contract Interest rate Pay 2.45%  
Contract Interest rate Receive 3M CD+0.32%  
Contract amount | ₩ ₩ 200,000  
Not Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty [2] Nomura  
Derivative, Term of Contract [2] 2018~2038  
Contract Interest rate Pay [2] 2.56%  
Contract Interest rate Receive [2] 3.75%  
Contract amount | ₩ [2] ₩ 30,000  
Not Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty KEB Hana Bank  
Derivative, Term of Contract 2018~2023  
Contract Interest rate Pay 2.15%  
Contract Interest rate Receive 3M CD+0.19%  
Contract amount | ₩ ₩ 200,000  
Not Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty KEB Hana Bank  
Derivative, Term of Contract 2018~2023  
Contract Interest rate Pay 2.17%  
Contract Interest rate Receive 3M CD+0.19%  
Contract amount | ₩ ₩ 200,000  
Not Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty KEB Hana Bank  
Derivative, Term of Contract 2018~2023  
Contract Interest rate Pay 2.03%  
Contract Interest rate Receive 3M CD+0.21%  
Contract amount | ₩ ₩ 150,000  
Not Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty Societe Generale  
Derivative, Term of Contract 2017~2022  
Contract Interest rate Pay 3M Libor+3.44%  
Contract Interest rate Receive 3.77%  
Contract amount | ₩ ₩ 200,000  
Not Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty Export-import bank of Korea  
Derivative, Term of Contract 2015~2031  
Contract Interest rate Pay 2.67%  
Contract Interest rate Receive 6M USD Libor  
Contract amount   $ 15,893
Not Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty ING Bank  
Derivative, Term of Contract 2015~2031  
Contract Interest rate Pay 2.67%  
Contract Interest rate Receive 6M USD Libor  
Contract amount   7,861
Not Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty BNP Paribas  
Derivative, Term of Contract 2015~2031  
Contract Interest rate Pay 2.67%  
Contract Interest rate Receive 6M USD Libor  
Contract amount   7,861
Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty BNP Paribas  
Derivative, Term of Contract 2009~2027  
Contract Interest rate Pay 4.16%  
Contract Interest rate Receive 6M USD Libor  
Contract amount   92,120
Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty KFW  
Derivative, Term of Contract 2009~2027  
Contract Interest rate Pay 4.16%  
Contract Interest rate Receive 6M USD Libor  
Contract amount   92,120
Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty Credit Agricole  
Derivative, Term of Contract 2018~2033  
Contract Interest rate Pay 3.98%~4.10%  
Contract Interest rate Receive 6M USD Libor  
Contract amount   92,686
Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty SMBC  
Derivative, Term of Contract 2018~2033  
Contract Interest rate Pay 4.05%~4.18%  
Contract Interest rate Receive 6M USD Libor  
Contract amount   121,205
Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty Mizuho Bank  
Derivative, Term of Contract 2016~2019  
Contract Interest rate Pay 1.56%  
Contract Interest rate Receive 1.65%  
Contract amount   36,890
Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty SMBC  
Derivative, Term of Contract 2016~2019  
Contract Interest rate Pay 1.56%  
Contract Interest rate Receive 1.65%  
Contract amount   36,890
Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty Export-import bank of Korea  
Derivative, Term of Contract 2016~2036  
Contract Interest rate Pay 3.00%  
Contract Interest rate Receive 4.99%  
Contract amount   $ 2,564
[1] 2.05% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CD+0.10% is applied thereafter.
[2] 2.56% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CD+0.10% is applied thereafter.