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Derivatives - Summary of Derivative Interest Rate Swap Contract List (Details) - 12 months ended Dec. 31, 2024 $ in Thousands, $ in Thousands, ₩ in Millions | KRW (₩) | AUD ($) | USD ($)
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Designated as Hedging Instrument | Interest rate swap 1 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 Synthetic Libor |  |
Contract amount | $ |  |  |  | $ 15,893
Designated as Hedging Instrument | Interest rate swap 2 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 Synthetic 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 Synthetic Libor |  |
Contract amount | $ |  |  |  | 7,861
Designated as Hedging Instrument | Interest rate swap 4 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 Synthetic Libor |  |
Contract amount | $ |  |  |  | 35,221
Designated as Hedging Instrument | Interest rate swap 5 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 Synthetic Libor |  |
Contract amount | $ |  |  |  | 35,221
Designated as Hedging Instrument | Interest rate swap 6 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 Synthetic Libor |  |
Contract amount | $ |  |  |  | 56,175
Not Designated as Hedging Instrument | Interest rate swap 1 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] | 3M CD + 0.10% |  |
Contract Interest rate Receive | [1] | 3.75% |  |
Contract amount | [1] | ₩ 30,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 2 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 3 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Hana Bank |  |
Derivative, Term of Contract |  | 2022~2027 |  |
Contract Interest rate Pay |  | 3.02% |  |
Contract Interest rate Receive |  | 3M CD + 0.61% |  |
Contract amount |  | ₩ 200,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 4 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Hana Bank |  |
Derivative, Term of Contract |  | 2022~2027 |  |
Contract Interest rate Pay |  | 3.04% |  |
Contract Interest rate Receive |  | 3M CD + 0.58% |  |
Contract amount |  | ₩ 200,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 5 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Hana Bank |  |
Derivative, Term of Contract |  | 2022~2027 |  |
Contract Interest rate Pay |  | 3.38% |  |
Contract Interest rate Receive |  | 3M CD + 0.59% |  |
Contract amount |  | ₩ 250,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 6 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Nomura |  |
Derivative, Term of Contract |  | 2022~2027 |  |
Contract Interest rate Pay |  | 3.55% |  |
Contract Interest rate Receive |  | 3M CD + 0.60% |  |
Contract amount |  | ₩ 200,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 7 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Shinhan Bank |  |
Derivative, Term of Contract |  | 2022~2027 |  |
Contract Interest rate Pay |  | 3.53% |  |
Contract Interest rate Receive |  | 3M CD + 0.55% |  |
Contract amount |  | ₩ 150,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 8 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Hana Bank |  |
Derivative, Term of Contract |  | 2022~2027 |  |
Contract Interest rate Pay |  | 3.70% |  |
Contract Interest rate Receive |  | 3M CD + 0.59% |  |
Contract amount |  | ₩ 200,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 9 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Nomura |  |
Derivative, Term of Contract |  | 2022~2027 |  |
Contract Interest rate Pay |  | 3.89% |  |
Contract Interest rate Receive |  | 3M CD + 0.67% |  |
Contract amount |  | ₩ 300,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 10 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Hana Bank |  |
Derivative, Term of Contract |  | 2022~2027 |  |
Contract Interest rate Pay |  | 3.93% |  |
Contract Interest rate Receive |  | 3M CD + 0.67% |  |
Contract amount |  | ₩ 200,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 11 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Nomura |  |
Derivative, Term of Contract |  | 2022~2027 |  |
Contract Interest rate Pay |  | 3.80% |  |
Contract Interest rate Receive |  | 3M CD + 0.68% |  |
Contract amount |  | ₩ 200,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 12 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Nomura |  |
Derivative, Term of Contract |  | 2022~2027 |  |
Contract Interest rate Pay |  | 4.04% |  |
Contract Interest rate Receive |  | 3M CD + 0.60% |  |
Contract amount |  | ₩ 300,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 13 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Hana Bank |  |
Derivative, Term of Contract |  | 2022~2027 |  |
Contract Interest rate Pay |  | 4.68% |  |
Contract Interest rate Receive |  | 3M CD + 1.04% |  |
Contract amount |  | ₩ 100,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 14 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Hana Bank |  |
Derivative, Term of Contract |  | 2022~2027 |  |
Contract Interest rate Pay |  | 5.45% |  |
Contract Interest rate Receive |  | 3M CD + 1.20% |  |
Contract amount |  | ₩ 100,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 15 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Shinhan Bank |  |
Derivative, Term of Contract |  | 2023~2028 |  |
Contract Interest rate Pay |  | 4.27% |  |
Contract Interest rate Receive |  | 3M CD + 0.76% |  |
Contract amount |  | ₩ 200,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 16 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Shinhan Bank |  |
Derivative, Term of Contract |  | 2023~2028 |  |
Contract Interest rate Pay |  | 4.27% |  |
Contract Interest rate Receive |  | 3M CD + 0.76% |  |
Contract amount |  | ₩ 50,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 17 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Nomura |  |
Derivative, Term of Contract |  | 2023~2028 |  |
Contract Interest rate Pay |  | 4.13% |  |
Contract Interest rate Receive |  | 3M CD + 0.73% |  |
Contract amount |  | ₩ 250,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 18 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Hana Bank |  |
Derivative, Term of Contract |  | 2023~2028 |  |
Contract Interest rate Pay |  | 3.74% |  |
Contract Interest rate Receive |  | 3M CD + 0.51% |  |
Contract amount |  | ₩ 200,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 19 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Hana Bank |  |
Derivative, Term of Contract |  | 2023~2028 |  |
Contract Interest rate Pay |  | 4.19% |  |
Contract Interest rate Receive |  | 3M CD + 0.50% |  |
Contract amount |  | ₩ 100,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 20 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Shinhan Bank |  |
Derivative, Term of Contract |  | 2023~2028 |  |
Contract Interest rate Pay |  | 3.81% |  |
Contract Interest rate Receive |  | 3M CD + 0.70% |  |
Contract amount |  | ₩ 300,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 21 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Hana Bank |  |
Derivative, Term of Contract |  | 2023~2028 |  |
Contract Interest rate Pay |  | 3.95% |  |
Contract Interest rate Receive |  | 3M CD + 0.50% |  |
Contract amount |  | ₩ 200,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 22 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Shinhan Bank |  |
Derivative, Term of Contract |  | 2024~2029 |  |
Contract Interest rate Pay |  | 3.84% |  |
Contract Interest rate Receive |  | 3M CD + 0.50% |  |
Contract amount |  | ₩ 200,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 23 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Hana Bank |  |
Derivative, Term of Contract |  | 2024~2027 |  |
Contract Interest rate Pay |  | 3.72% |  |
Contract Interest rate Receive |  | 3M CD + 0.34% |  |
Contract amount |  | ₩ 250,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 24 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Hana Bank |  |
Derivative, Term of Contract |  | 2024~2027 |  |
Contract Interest rate Pay |  | 3.77% |  |
Contract Interest rate Receive |  | 3M CD + 0.31% |  |
Contract amount |  | ₩ 250,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 25 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Hana Bank |  |
Derivative, Term of Contract |  | 2024~2027 |  |
Contract Interest rate Pay |  | 3.31% |  |
Contract Interest rate Receive |  | 3M CD + 0.31% |  |
Contract amount |  | ₩ 250,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 26 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Hana Bank |  |
Derivative, Term of Contract |  | 2024~2027 |  |
Contract Interest rate Pay |  | 3.46% |  |
Contract Interest rate Receive |  | 3M CD + 0.53% |  |
Contract amount |  | ₩ 200,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 27 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Shinhan Bank |  |
Derivative, Term of Contract |  | 2024~2025 |  |
Contract Interest rate Pay |  | 3.53% |  |
Contract Interest rate Receive |  | 3M CD + 0.35% |  |
Contract amount |  | ₩ 200,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 28 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Nomura |  |
Derivative, Term of Contract |  | 2024~2027 |  |
Contract Interest rate Pay |  | 3.38% |  |
Contract Interest rate Receive |  | 3M CD + 0.50% |  |
Contract amount |  | ₩ 200,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 29 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Hana Bank |  |
Derivative, Term of Contract |  | 2024~2027 |  |
Contract Interest rate Pay |  | 3.18% |  |
Contract Interest rate Receive |  | 3M CD + 0.53% |  |
Contract amount |  | ₩ 300,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 30 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Shinhan Bank |  |
Derivative, Term of Contract |  | 2024~2025 |  |
Contract Interest rate Pay |  | 3.29% |  |
Contract Interest rate Receive |  | 3M CD + 0.42% |  |
Contract amount |  | ₩ 100,000 |  |
Not Designated as Hedging Instrument | Interest rate swap 31 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Nomura |  |
Derivative, Term of Contract |  | 2017~2032 |  |
Contract Interest rate Pay |  | 2.55% + Floating rate |  |
Contract Interest rate Receive |  | 2.60% |  |
Contract amount |  | ₩ 52,457 |  |
Not Designated as Hedging Instrument | Interest rate swap 32 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Nomura |  |
Derivative, Term of Contract |  | 2017~2032 |  |
Contract Interest rate Pay |  | 2.57% + Floating rate |  |
Contract Interest rate Receive |  | 2.62% |  |
Contract amount |  | ₩ 59,423 |  |
Not Designated as Hedging Instrument | Interest rate swap 33 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 34 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 |  |
Not Designated as Hedging Instrument | Interest rate swap 35 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | ANZ |  |
Derivative, Term of Contract |  | 2022~2025 |  |
Contract Interest rate Pay |  | 0.48% |  |
Contract Interest rate Receive |  | 3M BBSW + 0.05% |  |
Contract amount | $ |  |  | $ 865 |
Not Designated as Hedging Instrument | Interest rate swap 36 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | DBS Bank |  |
Derivative, Term of Contract |  | 2022~2025 |  |
Contract Interest rate Pay |  | 0.48% |  |
Contract Interest rate Receive |  | 3M BBSW + 0.05% |  |
Contract amount | $ |  |  | 865 |
Not Designated as Hedging Instrument | Interest rate swap 37 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Societe Generale |  |
Derivative, Term of Contract |  | 2022~2025 |  |
Contract Interest rate Pay |  | 0.48% |  |
Contract Interest rate Receive |  | 3M BBSW + 0.05% |  |
Contract amount | $ |  |  | $ 865 |
Not Designated as Hedging Instrument | Interest rate swap 38 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | MUFG |  |
Derivative, Term of Contract |  | 2022~2048 |  |
Contract Interest rate Pay |  | 3M SOFR |  |
Contract Interest rate Receive |  | 3.71% |  |
Contract amount | $ |  |  |  | 155,941
Not Designated as Hedging Instrument | Interest rate swap 39 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Mizuho Capital Markets LLC |  |
Derivative, Term of Contract |  | 2022~2048 |  |
Contract Interest rate Pay |  | 3M SOFR |  |
Contract Interest rate Receive |  | 1.05% |  |
Contract amount | $ |  |  |  | 155,941
Not Designated as Hedging Instrument | Interest rate swap 40 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Mizuho Capital Markets LLC |  |
Derivative, Term of Contract |  | 2024~2025 |  |
Contract Interest rate Pay |  | 1M SOFR |  |
Contract Interest rate Receive |  | 4.20% |  |
Contract amount | $ |  |  |  | 112,194
Not Designated as Hedging Instrument | Interest rate swap 41 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Rabobank |  |
Derivative, Term of Contract |  | 2022~2036 |  |
Contract Interest rate Pay |  | 1.83% |  |
Contract Interest rate Receive |  | 6M SOFR |  |
Contract amount | $ |  |  |  | 37,130
Not Designated as Hedging Instrument | Interest rate swap 42 contracts |  |  |  |
Disclosure of Derivative Interest rate swap contract detail list [Line Items] |  |  |  |
Counterparty |  | Mizuho Capital Markets LLC |  |
Derivative, Term of Contract |  | 2024~2045 |  |
Contract Interest rate Pay |  | 3M USD Synthetic Libor |  |
Contract Interest rate Receive |  | 1.14% |  |
Contract amount | $ |  |  |  | $ 80,116
[1] | 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.

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