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Intangible Assets other than Goodwill - Summary of Significant Specific Intangible Assets (Details) ₩ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 KRW (₩) | Dec. 31, 2023 KRW (₩) | Dec. 31, 2024 AUD ($) | Dec. 31, 2023 AUD ($)
Software | S/4HANA ERP license |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  | ₩ 4,276 | ₩ 5,742 |  |
Remaining amortisation period of intangible assets material to entity |  | 2 years 11 months | 3 years 11 months |  |
Copyrights, patents rights and other industrial rights | Contributions to APR NRC DC |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  | ₩ 12,523 | ₩ 16,697 |  |
Remaining amortisation period of intangible assets material to entity |  | 3 years | 4 years |  |
Mining rights | Mining right of Bylong mine |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value | $ |  |  |  | $ 0 | $ 0
Remaining amortisation period of intangible assets material to entity | [1] | The carrying amount of mining rights is nil, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. had recognized impairment losses in full. | The carrying amount of mining rights is nil, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. had recognized impairment losses in full. |  |
Usage rights of donated assets and other | Sejong Haengbogdosi sharing charge |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  | ₩ 8,697 | ₩ 13,235 |  |
Remaining amortisation period of intangible assets material to entity |  | 1 year 11 months | 2 years 11 months |  |
Usage rights of donated assets and other | Right of use electricity and gas supply facility (Community district of Songdo) |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  | ₩ 5,799 | ₩ 6,853 |  |
Remaining amortisation period of intangible assets material to entity |  | 5 years 6 months | 6 years 6 months |  |
Others | Occupancy and use of public waters |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  | ₩ 65,389 | ₩ 70,800 |  |
Remaining amortisation period of intangible assets material to entity |  | 12 years 1 month | 13 years 1 month |  |
Others | Greenhouse gas emissions rights |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  | ₩ 135,534 | ₩ 107,086 |  |
Others | Business rights |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  | ₩ 143,216 | ₩ 148,964 |  |
Remaining amortisation period of intangible assets material to entity |  | 24 years 11 months | 25 years 11 months |  |
[1] | The carrying amount of mining rights is nil, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. had recognized impairment losses in full.

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