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Derivative Interest rate swap contract List (Details) - 12 months ended Dec. 31, 2020 - 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 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 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 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 Nomura  
Derivative, Term of Contract 2018~2038  
Contract Interest rate Pay [1] 2.56%  
Contract Interest rate Receive 3.75%  
Contract amount ₩ 30,000  
Not Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty 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 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 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 Hana Bank  
Derivative, Term of Contract 2019~2024  
Contract Interest rate Pay 1.87%  
Contract Interest rate Receive 3M CD + 0.13%  
Contract amount ₩ 200,000  
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 Nomura  
Derivative, Term of Contract 2017~2032  
Contract Interest rate Pay 3M Libor + 2.22%  
Contract Interest rate Receive 2.60%  
Contract amount ₩ 52,457  
Not Designated as Hedging Instrument [Member]    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty Nomura  
Derivative, Term of Contract 2017~2032  
Contract Interest rate Pay 3M Libor + 2.24%  
Contract Interest rate Receive 2.62%  
Contract amount ₩ 59,423  
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
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
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 | $   69,509
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 | $   69,509
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 6M USD Libor  
Contract amount | $   $ 75,929
[1] 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. Depending on the counterparty exercising the right, the contract may be early settled on the same date every year from June 15, 2023.