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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, 2021 KRW (₩) | Dec. 31, 2020 KRW (₩) | Dec. 31, 2021 AUD ($) | Dec. 31, 2020 AUD ($)
Software | ERP system and others |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |
Carrying value | ₩ 3,817 | ₩ 81 |  |
Remaining amortisation period of intangible assets material to entity | 2 years and 8 months | 2 months ~ 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 | ₩ 4,936 |  |
Remaining amortisation period of intangible assets material to entity | 9 months | 1 year and 9 months |  |
Copyrights, patents rights and other industrial rights | Contributions to ARP NRC DC |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |
Carrying value | ₩ 25,045 | ₩ 29,219 |  |
Remaining amortisation period of intangible assets material to entity | 6 years | 7 years |  |
Mining rights | Mining right of Bylong mine |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |
Carrying value | ₩ 0 | ₩ 0 | $ 0 | $ 0
Remaining amortisation period of intangible assets material to entity | 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. |  |
Development expenditures | Electricity sales information system |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |
Carrying value |  | ₩ 8,229 |  |
Remaining amortisation period of intangible assets material to entity |  | 1 year and 2 months |  |
Usage rights of donated assets and other | Dangjin power plant load facility usage right |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |
Carrying value |  | ₩ 1,574 |  |
Remaining amortisation period of intangible assets material to entity |  | 3 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 | ₩ 8,962 | ₩ 10,016 |  |
Remaining amortisation period of intangible assets material to entity | 8 years and 6 months | 9 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 | ₩ 22,310 | ₩ 26,847 |  |
Remaining amortisation period of intangible assets material to entity | 4 years and 11 months | 5 years and 11 months |  |
Others | Occupancy and use of public waters |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |
Carrying value | ₩ 81,623 | ₩ 87,035 |  |
Remaining amortisation period of intangible assets material to entity | 15 years and 1 month | 16 years and 1 month |  |
Others | Greenhouse gas emissions rights |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |
Carrying value | ₩ 78,137 | ₩ 61,373 |  |
Remaining amortisation period of intangible assets material to entity | — | 0 |  |
Others | Business rights |  |  |  |
Disclosure of intangible assets material to entity [line items] |  |  |  |
Carrying value | ₩ 160,459 | ₩ 166,207 |  |
Remaining amortisation period of intangible assets material to entity | 27 years and 11 months | 28 years and 11 months |  |

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