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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, 2023 KRW (₩) | Dec. 31, 2022 KRW (₩) | Dec. 31, 2023 AUD ($) | Dec. 31, 2022 AUD ($)
Software | ORACLE license for SDIS integrated DB |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  |  | ₩ 5,509 |  |
Remaining amortisation period of intangible assets material to entity |  |  | 3 years 4 months |  |
Software | S/4HANA ERP license |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  | ₩ 5,742 |  |  |
Remaining amortisation period of intangible assets material to entity |  | 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 |  | ₩ 16,697 | ₩ 20,871 |  |
Remaining amortisation period of intangible assets material to entity |  | 4 years | 5 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 |  | ₩ 13,235 | ₩ 17,772 |  |
Remaining amortisation period of intangible assets material to entity |  | 2 years 11 months | 3 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 |  | ₩ 6,853 | ₩ 7,908 |  |
Remaining amortisation period of intangible assets material to entity |  | 6 years 6 months | 7 years 6 months |  |
Others | Occupancy and use of public waters |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  | ₩ 70,800 | ₩ 76,212 |  |
Remaining amortisation period of intangible assets material to entity |  | 13 years 1 month | 14 years 1 month |  |
Others | Greenhouse gas emissions rights |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  | ₩ 107,086 | ₩ 43,960 |  |
Others | Business rights |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  | ₩ 148,964 | ₩ 154,712 |  |
Remaining amortisation period of intangible assets material to entity |  | 25 years 11 months | 26 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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