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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, 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.