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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