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Derivatives - Summary of Derivative Interest Rate Swap Contract List (Details) - 12 months ended Dec. 31, 2021
$ in Thousands, ₩ in Millions
KRW (₩)
USD ($)
Designated as Hedging Instrument | Interest rate swap contracts    
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 | Interest rate swap contracts    
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 | Interest rate swap 3 contracts    
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 | Interest rate swap contracts    
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 | $   60,316
Designated as Hedging Instrument | Interest rate swap contracts    
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 | $   60,316
Designated as Hedging Instrument | Interest rate swap contracts    
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 | $   $ 71,116
Not Designated as Hedging Instrument | Interest rate swap contracts    
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 | Interest rate swap contracts    
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 | Interest rate swap 3 contracts    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty [1] Nomura  
Derivative, Term of Contract [1] 2018~2038  
Contract Interest rate Pay [1] 2.56  
Contract Interest rate Receive [1] 3.75  
Contract amount [1] ₩ 30,000  
Not Designated as Hedging Instrument | Interest rate swap contracts    
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 | Interest rate swap contracts    
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 | Interest rate swap contracts    
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 | Interest rate swap contracts    
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 | Interest rate swap contracts    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty Shinhan Bank  
Derivative, Term of Contract 2021~2025  
Contract Interest rate Pay 2.32  
Contract Interest rate Receive 3M CD + 0.43%  
Contract amount ₩ 100,000  
Not Designated as Hedging Instrument | Interest rate swap contracts    
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 | Interest rate swap contracts    
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 | Interest rate swap contracts    
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  
Not Designated as Hedging Instrument | Interest rate swap 12 contracts    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty [2] Nomura  
Derivative, Term of Contract [2] 2021~2041  
Contract Interest rate Pay [2] 1.84  
Contract Interest rate Receive [2] 2.60  
Contract amount [2] ₩ 30,000  
Not Designated as Hedging Instrument | Interest rate swap 13 contracts    
Disclosure of Derivative Interest rate swap contract detail list [Line Items]    
Counterparty [3] Nomura  
Derivative, Term of Contract [3] 2021~2041  
Contract Interest rate Pay [3] 1.87  
Contract Interest rate Receive [3] 2.38  
Contract amount [3] ₩ 50,000  
[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.
[2] 1.84% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CMT + 0.35% is applied thereafter.
[3] 1.87% of the contract paying interest rate is applied for five years from the date of issuance, and 3M CMT + 0.35% is applied thereafter.