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Contingencies and Commitments - Additional Information (Details) € in Thousands, Rp in Thousands, $ in Thousands, ₩ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 KRW (₩) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 EUR (€) | Dec. 31, 2023 IDR (Rp) | Dec. 31, 2022 KRW (₩)
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Borrowings | ₩ | ₩ 133,631,830 |  |  |  |  | ₩ 120,605,365
Six One Seven One One Nuri Ri Yeongi Myeon Seojong [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Book value of land | ₩ | ₩ 64,371 |  |  |  |  |
Gunsan Land Solar [Member] | Ninety Nine Megawatt Photovoltaic Power Generation Facility [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Percentage of the project cost to be financed | 80.00% |  | 80.00% | 80.00% | 80.00% |
Percentage return on the invested capital to be provided | 7.00% | 7.00% |  |  |  |
Percentage interest on the amount falling short of capital raise | 7.00% |  | 7.00% | 7.00% | 7.00% |
Arbitration With Westing House Electric Company LLC To Korean Commercial Arbitration Board [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Other provisions | ₩ |  |  |  |  |  | ₩ 0
Hitachi Energy Sweden Field Arbitration Case In Relation To Construction Projects [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
New provisions other provisions | ₩ | ₩ 0 |  |  |  |  |
Commercial Arbitration Expenses Payment Jindo Jeju High Voltage Direct Current Connection Contract Project [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
New provisions other provisions | ₩ | 0 |  |  |  |  |
Axia Power Holdings B.V [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Maximum performance guarantee amount |  |  | $ 54,000 |  |  |
PT Perusahaan Listrik Negara [Member] | Operation Maintenance Project In Indonesia Siborpa [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Maximum performance guarantee amount |  |  | 2,280 |  |  |
Morgan Stanley Capital Group Inc [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Maximum performance guarantee amount |  |  | 30,000 |  |  |
Morgan Stanley Renewables Inc [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Maximum performance guarantee amount |  |  | 70,000 |  |  |
Microsoft Through Kookmin Bank [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Maximum performance guarantee amount | € |  |  |  | € 12,053 |  |
PT. Cirebon Electro Power [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Maximum performance guarantee amount |  |  | 54,000 |  |  |
Export Import Bank Of Korea ,BNP Paribas And ING Bank [Member] | PT BS Energy And PT Nusantara Hydro Alam [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Guarantee for investments |  |  | 6,085 |  |  |
KOMIPO Vanphong Power Service LLC [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Maximum performance guarantee amount |  |  | 5,000 |  |  |
Kookmin Bank [Member] | Concho Valley Energy, LLC [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Provision for loss contingencies |  | $ 40,000 |  |  |  |
Gaesong Industrial Complex [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Book value of facility | ₩ | 12,123 |  |  |  |  |
Gangneung [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Suspended operations of plant carrying amount | ₩ | 62,871 |  |  |  |  |
Expenses related to suspension of operations | ₩ | 1,494 |  |  |  |  |
Depreaciation on idle assets | ₩ | 3,683 |  |  |  |  |
Korea Energy Agency [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Borrowings | ₩ | 1,197 |  |  |  |  |
Mizuho Bank [Member] | PT. Cirebon Electro Power [Member] | Nongyup Bank [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Payment guarantee |  |  | 3,355 |  |  |
RBC Community Investments Impact Renewables Hold Co One LLC [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Subscription amount guaranteed |  |  | 62,800 |  |  |
RBC Community Investments Impact Renewables Hold Co One LLC [Member] | Concho Valley Energy, LLC [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Maximum performance guarantee amount |  |  | $ 3,000 |  |  |
PT Perushan Listrik Negara [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Maximum performance guarantee amount | Rp |  |  |  |  | Rp 35,588,165 |
Haetbyotgil Sunlight Company Limited [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Insurance contract guarantee | ₩ | ₩ 1,641 |  |  |  |  |
Bottom of range [member] | Gunsan Land Solar [Member] | Ninety Nine Megawatt Photovoltaic Power Generation Facility [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Percentage of the project cost to be financed | 80.00% |  | 80.00% | 80.00% | 80.00% |
International Finance Corporation [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  | $ 264,800 |  |  |
Capital commitments |  |  | 69,808 |  |  |
Additional capital contribution for contingencies |  |  | 19,000 |  |  |
PT Bank KB Bukopin [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Debt amount guaranteed |  |  | $ 5,473 |  |  |
Ordinary Wages And Unpaid Wages [Member] |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |
Provision for loss contingencies | ₩ | ₩ 39,229 |  |  |  |  |

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