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Intangible Assets other than Goodwill - Summary of Significant Specific Intangible Assets (Details) ₩ in Millions, $ in Millions | 12 Months Ended |  |
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Dec. 31, 2022 KRW (₩) | Dec. 31, 2021 KRW (₩) | Dec. 31, 2022 AUD ($) | Dec. 31, 2021 AUD ($)
Software | DAS MSSQL CORE license [Member] |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  |  | ₩ 3,817 |  |
Remaining amortisation period of intangible assets material to entity |  |  | 2 years and 8 months |  |
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 and 4 months |  |  |
Copyrights, patents rights and other industrial rights | Smart technology verification and standard design project conducting right |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  |  | ₩ 1,851 |  |
Remaining amortisation period of intangible assets material to entity |  |  | 9 months |  |
Copyrights, patents rights and other industrial rights | Contributions to APR NRC DC |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  | ₩ 20,871 | ₩ 25,045 |  |
Remaining amortisation period of intangible assets material to entity |  | 5 years | 6 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 | Right of use electricity and gas supply facility (Community district of Songdo) |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  | ₩ 7,908 | ₩ 8,962 |  |
Remaining amortisation period of intangible assets material to entity |  | 7 years and 6 months | 8 years and 6 months |  |
Usage rights of donated assets and other | Sejong Haengbogdosi sharing charge |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  | ₩ 17,772 | ₩ 22,310 |  |
Remaining amortisation period of intangible assets material to entity |  | 3 years and 11 months | 4 years and 11 months |  |
Others | Occupancy and use of public waters |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  | ₩ 76,212 | ₩ 81,623 |  |
Remaining amortisation period of intangible assets material to entity |  | 14 years and 1 month | 15 years and 1 month |  |
Others | Greenhouse gas emissions rights |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  | ₩ 43,960 | ₩ 78,137 |  |
Remaining amortisation period of intangible assets material to entity |  | 0 | 0 |  |
Others | Business rights |  |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |  |
Carrying value |  | ₩ 154,712 | ₩ 160,459 |  |
Remaining amortisation period of intangible assets material to entity |  | 26 years and 11 months | 27 years and 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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