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Contingencies and Commitments - Additional Information (Details) € in Thousands, Rp in Thousands, $ in Thousands, ₩ in Millions |  | 12 Months Ended |  |
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May 18, 2015 Individuals | Dec. 31, 2021 KRW (₩) Individuals | Dec. 31, 2021 USD ($) Individuals | Dec. 31, 2021 USD ($) | Dec. 31, 2021 IDR (Rp) | Dec. 31, 2021 EUR (€) | Dec. 31, 2020 KRW (₩)
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Borrowings | ₩ |  | ₩ 6,662,747 |  |  |  |  | ₩ 5,133,802
Axia Power Holdings B.V [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Maximum Performance Guarantee Amount |  |  |  | $ 54,000 |  |  |
PT Perusahaan Listrik Negara [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Maximum Performance Guarantee Amount | Rp |  |  |  |  | Rp 35,907,215 |  |
ExportImport Bank of Korea [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Maximum Performance Guarantee Amount |  |  |  | 12,090 |  |  |
Other Borrowings Guarantee Amount |  |  |  | 5,911 |  |  |
PT. Cirebon Energi Prasarana |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Maximum Performance Guarantee Amount |  |  |  | 43,500 |  |  |
Van Phong Power Company Ltd [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Maximum Performance Guarantee Amount |  |  |  | 5,000 |  |  |
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 |  |  |
Frankfurt Branch Through Kookmin Bank [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Maximum Performance Guarantee Amount | € |  |  |  |  |  | € 10,000 |
Microsoft Through Kookmin Bank [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Maximum Performance Guarantee Amount | € |  |  |  |  |  | 5,022 |
Ellevio Through Shinhan Bank [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Maximum Performance Guarantee Amount | € |  |  |  |  |  | € 9,980 |
Shinhan Bank [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Other Borrowings Guarantee Amount |  |  |  | 60,000 |  |  |
Primoris Renewable Energy, Inc [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Maximum Performance Guarantee Amount |  |  |  | 76,700 |  |  |
PT. Cirebon Electro Power [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Maximum Performance Guarantee Amount |  |  |  | 54,000 |  |  |
Gaesong Industrial Complex [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Book value of facility | ₩ |  | 14,451 |  |  |  |  |
Trade receivables | ₩ |  | 2,911 |  |  |  |  |
Next Energy Co Ltd [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Contractual capital commitments | ₩ |  | 14,700 |  |  |  |  |
Gangneung [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Suspended operations of plant carrying amount | ₩ |  | 68,674 |  |  |  |  |
Expenses related to suspension of operations | ₩ |  | 44 |  |  |  |  |
Depreaciation on idle assets | ₩ |  | 3,621 |  |  |  |  |
Export Import Bank Of Korea [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Guarantee provided for mutual investments |  |  |  | 2,192 |  |  |
AEP Texas Inc [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Business performance guarantees |  |  |  | 18,500 |  |  |
Korea Energy Agency [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Borrowings | ₩ |  | ₩ 1,197 |  |  |  |  |
Top of range [member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Guarantee provided for investments |  |  |  | 43,500 |  |  |
Top of range [member] | Perusahaan Listik Negara [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Business performance guarantees |  |  |  | 2,293 |  |  |
Top of range [member] | MUFG Bank Ltd [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Guarantee provided for borrowings |  |  |  | 41,258 |  |  |
International Finance Corporation [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | 275,600 |  |  |
Capital commitments |  |  |  | 69,808 |  |  |
Additional capital contribution for contingencies |  |  |  | $ 19,000 |  |  |
Guarantee payment provided |  |  | $ 2,777 |  |  |  |
Extending The Operation Of Wolsong Unit [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Number of individuals filed lawsuit | Individuals | 2,167 |  |  |  |  |  |
Contribution To Plan Assets [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Number of individuals filed lawsuit | Individuals |  | 3,910 | 3,910 |  |  |  |
Provision for loss contingencies | ₩ |  | ₩ 11,730 |  |  |  |  |
Ordinary Wages And Unpaid Wages [Member] |  |  |  |  |  |  |
Detailed Information About Commitments [Line Items] |  |  |  |  |  |  |
Provision for loss contingencies | ₩ |  | ₩ 3,233 |  |  |  |  |

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