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Intangible Assets other than Goodwill (Details)
$ in Thousands, ₩ in Millions
 12 Months Ended
Dec. 31, 2019
KRW (₩)
Dec. 31, 2018
KRW (₩)
Dec. 31, 2019
AUD ($)
Dec. 31, 2018
AUD ($)
Software | ERP system and others        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value ₩ 432 ₩ 783    
Remaining amortisation period of intangible assets material to entity 1 years and 2 months ~ 1 years and 4 months 2 years and 2 months ~ 2 years and 4 months    
Software | Electricity sales information system        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value ₩ 4,824 ₩ 6,477    
Remaining amortisation period of intangible assets material to entity 3 years 4 years    
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 ₩ 6,787 ₩ 9,256    
Remaining amortisation period of intangible assets material to entity 2 years and 9 months 3 years 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 ₩ 34,755 ₩ 46,594    
Remaining amortisation period of intangible assets material to entity 8 years 9 years    
Mining rights | Mining right of Bylong mine        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value | $     $ 0 $ 401,225
Remaining amortisation period of intangible assets material to entity The carrying amount of mining right does not exist, because KEPCO Australia Pty., Ltd. and KEPCO Bylong Australia Pty., Ltd. recognized impairment losses in full during the year ended December 31, 2019. Mining rights are amortized using the units-of-production method and the amortization has not commenced yet.    
Development expenditures | Electricity sales information system        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value ₩ 15,283 ₩ 22,337    
Remaining amortisation period of intangible assets material to entity 2 years and 3 months 3 years and 3 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 ₩ 7,870 ₩ 14,167    
Remaining amortisation period of intangible assets material to entity 1 years 3 months 2 years 3 months    
Usage rights of donated assets and other | Sejong Haengbogdosi sharing charge        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value ₩ 31,385 ₩ 35,923    
Remaining amortisation period of intangible assets material to entity 6 years and 11 months 7 years and 11 months    
Others | Occupancy and use of public waters        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value ₩ 92,446 ₩ 97,858    
Remaining amortisation period of intangible assets material to entity 17 years 1 months 18 years 1 months    
Others | Business rights        
Disclosure of intangible assets material to entity [Line Items]        
Carrying value ₩ 171,955      
Remaining amortisation period of intangible assets material to entity 29 years 11 months