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Consolidated Subsidiaries - Summary of Consolidated Subsidiaries (Details)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Korea Hydro & Nuclear Power Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
Korea South-East Power Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
Korea Midland Power Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
Korea Western Power Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
Korea Southern Power Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
Korea East-West Power Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
KEPCO Engineering & Construction Company, Inc.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities [1] Engineering and construction for utility plant and others Engineering and construction for utility plant and others
Location [1] Korea Korea
Proportion of ownership (%) [1] 65.77% 65.77%
KEPCO Plant Service & Engineering Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Utility plant maintenance and others Utility plant maintenance and others
Location Korea Korea
Proportion of ownership (%) 51.00% 51.00%
KEPCO Nuclear Fuel Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Nuclear fuel Nuclear fuel
Location Korea Korea
Proportion of ownership (%) 96.36% 96.36%
KEPCO KDN Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Electric power information technology and others Electric power information technology and others
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
KEPCO International HongKong Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Hong Kong Hong Kong
Proportion of ownership (%) 100.00% 100.00%
KEPCO International Philippines Inc.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Philippines Philippines
Proportion of ownership (%) 100.00% 100.00%
KEPCO Gansu International Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Hong Kong Hong Kong
Proportion of ownership (%) 100.00% 100.00%
KEPCO Philippines Holdings Inc.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities [2] Holding company Holding company
Location [2] Philippines Philippines
Proportion of ownership (%) [2] 100.00% 100.00%
KEPCO Philippines Corporation    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Operation of utility plant Operation of utility plant
Location Philippines Philippines
Proportion of ownership (%) 100.00% 100.00%
KEPCO Ilijan Corporation    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Construction and operation of utility plant Construction and operation of utility plant
Location Philippines Philippines
Proportion of ownership (%) 51.00% 51.00%
KEPCO Lebanon SARL    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Operation of utility plant Operation of utility plant
Location Lebanon Lebanon
Proportion of ownership (%) 100.00% 100.00%
KEPCO Neimenggu International Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Hong Kong Hong Kong
Proportion of ownership (%) 100.00% 100.00%
KEPCO Shanxi International Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Hong Kong Hong Kong
Proportion of ownership (%) 100.00% 100.00%
KOMIPO Global Pte Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Singapore Singapore
Proportion of ownership (%) 100.00% 100.00%
KEPCO Netherlands B.V.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Netherlands Netherlands
Proportion of ownership (%) 100.00% 100.00%
KEPCO Australia Pty., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Resources development Resources development
Location Australia Australia
Proportion of ownership (%) 100.00% 100.00%
KOSEP Australia Pty., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Resources development Resources development
Location Australia Australia
Proportion of ownership (%) 100.00% 100.00%
KOMIPO Australia Pty., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Resources development Resources development
Location Australia Australia
Proportion of ownership (%) 100.00% 100.00%
KOWEPO Australia Pty., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Resources development Resources development
Location Australia Australia
Proportion of ownership (%) 100.00% 100.00%
KOSPO Australia Pty., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Resources development Resources development
Location Australia Australia
Proportion of ownership (%) 100.00% 100.00%
KEPCO Middle East Holding Company    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Bahrain Bahrain
Proportion of ownership (%) 100.00% 100.00%
Qatrana Electric Power Company    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Construction and operation of utility plant Construction and operation of utility plant
Location Jordan Jordan
Proportion of ownership (%) 80.00% 80.00%
KHNP Canada Energy Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Canada Canada
Proportion of ownership (%) 100.00% 100.00%
KEPCO Bylong Australia Pty., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Resources development Resources development
Location Australia Australia
Proportion of ownership (%) 100.00% 100.00%
Korea Waterbury Uranium Limited Partnership    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Resources development Resources development
Location Canada Canada
Proportion of ownership (%) 80.00% 80.00%
KEPCO Holdings de Mexico    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Mexico Mexico
Proportion of ownership (%) 100.00% 100.00%
KST Electric Power Company, S.A.P.I. de C.V.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Construction and operation of utility plant Construction and operation of utility plant
Location Mexico Mexico
Proportion of ownership (%) 56.00% 56.00%
KEPCO Energy Service Company    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Operation of utility plant Operation of utility plant
Location Mexico Mexico
Proportion of ownership (%) 100.00% 100.00%
KEPCO Netherlands S3 B.V.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Netherlands Netherlands
Proportion of ownership (%) 100.00% 100.00%
PT. KOMIPO Pembangkitan Jawa Bali    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Operation of utility plant Operation of utility plant
Location Indonesia Indonesia
Proportion of ownership (%) 51.00% 51.00%
PT. Cirebon Power Service    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities [3] Operation of utility plant Operation of utility plant
Location [3] Indonesia Indonesia
Proportion of ownership (%) [3] 27.50% 27.50%
KOWEPO International Corporation    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Operation of utility plant Operation of utility plant
Location Philippines Philippines
Proportion of ownership (%) 99.99% 99.99%
KOSPO Jordan LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Operation of utility plant Operation of utility plant
Location Jordan Jordan
Proportion of ownership (%) 100.00% 100.00%
EWP America Inc.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
EWP Renewable Corporation    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
KNF Canada Energy Limited    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Canada Canada
Proportion of ownership (%) 100.00% 100.00%
EWP Barbados 1 SRL    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Barbados Barbados
Proportion of ownership (%) 100.00% 100.00%
California Power Holdings, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
Gyeonggi Green Energy Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 62.01% 62.01%
PT. Tanggamus Electric Power    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Indonesia Indonesia
Proportion of ownership (%) 52.50% 52.50%
Gyeongju Wind Power Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 70.00% 70.00%
KOMIPO America Inc.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
EWPRC Biomass Holdings, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 0.00% 100.00%
Reason Liquidation  
PT. EWP Indonesia    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Indonesia Indonesia
Proportion of ownership (%) 99.96% 99.96%
KEPCO Netherlands J3 B.V.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Netherlands Netherlands
Proportion of ownership (%) 100.00% 100.00%
Korea Offshore Wind Power Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
Global One Pioneer B.V.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Netherlands Netherlands
Proportion of ownership (%) 100.00% 100.00%
Global Energy Pioneer B.V.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Netherlands Netherlands
Proportion of ownership (%) 100.00% 100.00%
Mira Power Limited    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities [4] Power generation Power generation
Location [4] Pakistan Pakistan
Proportion of ownership (%) [4] 76.00% 76.00%
KOSEP Material Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Recycling fly ashes Recycling fly ashes
Location Korea Korea
Proportion of ownership (%) 86.22% 86.22%
Commerce and Industry Energy Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities [5] RDF power generation RDF power generation
Location [5] Korea Korea
Proportion of ownership (%) [5] 85.03% 85.03%
KEPCO KPS Philippines Corp.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Utility plant maintenance and others Utility plant maintenance and others
Location Philippines Philippines
Proportion of ownership (%) 99.99% 99.99%
KOSPO Chile SpA    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Chile Chile
Proportion of ownership (%) 100.00% 100.00%
PT. KOWEPO Sumsel Operation and Maintenance Services    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Utility plant maintenance and others Utility plant maintenance and others
Location Indonesia Indonesia
Proportion of ownership (%) 95.00% 95.00%
Hee Mang Sunlight Power Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Operation of utility plant Operation of utility plant
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
Fujeij Wind Power Company    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Operation of utility plant Operation of utility plant
Location Jordan Jordan
Proportion of ownership (%) 100.00% 100.00%
KOSPO Youngnam Power Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities [6] Operation of utility plant Operation of utility plant
Location [6] Korea Korea
Proportion of ownership (%) [6] 50.00% 50.00%
Chitose Solar Power Plant LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Japan Japan
Proportion of ownership (%) 65.00% 65.00%
KEPCO Energy Solution Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Energy service Energy service
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
KEPCO Solar Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
KOSPO Power Services Ltda.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Utility plant maintenance and others Utility plant maintenance and others
Location Chile Chile
Proportion of ownership (%) 65.00% 65.00%
Energy New Industry Specialized Investment Private Investment Trust    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Korea Korea
Proportion of ownership (%) 99.01% 99.01%
KOEN Bylong Pty., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Resources development Resources development
Location Australia Australia
Proportion of ownership (%) 100.00% 100.00%
KOMIPO Bylong Pty., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Resources development Resources development
Location Australia Australia
Proportion of ownership (%) 100.00% 100.00%
KOWEPO Bylong Pty., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Resources development Resources development
Location Australia Australia
Proportion of ownership (%) 100.00% 100.00%
KOSPO Bylong Pty., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Resources development Resources development
Location Australia Australia
Proportion of ownership (%) 100.00% 100.00%
EWP Bylong Pty., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Resources development Resources development
Location Australia Australia
Proportion of ownership (%) 100.00% 100.00%
KOWEPO Lao International    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Utility plant maintenance and others Utility plant maintenance and others
Location Laos Laos
Proportion of ownership (%) 100.00% 100.00%
KEPCO US Inc.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
KEPCO Alamosa LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 0.00% 50.10%
Reason Liquidation  
KEPCO Solar of Alamosa LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location USA USA
Proportion of ownership (%) 0.00% 100.00%
Reason Disposal  
KEPCO Mangilao Holdings LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
Mangilao Investment LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 80.06% 100.00%
KEPCO Mangilao Solar, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
Jeju Hanlim Offshore Wind Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 79.03% 79.03%
PT. Siborpa Eco Power    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Construction and operation of utility plant Construction and operation of utility plant
Location Indonesia Indonesia
Proportion of ownership (%) 55.00% 55.00%
BSK E-New Industry Fund VII    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Korea Korea
Proportion of ownership (%) 81.67% 81.67%
e-New Industry LB Fund 1    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Korea Korea
Proportion of ownership (%) 76.11% 76.11%
Songhyun e-New Industry Fund    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Korea Korea
Proportion of ownership (%) 80.65% 80.65%
BSK E-New Industry Fund X    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Korea Korea
Proportion of ownership (%) 66.80% 66.80%
PT. Korea Energy Indonesia    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Utility plant maintenance and others Utility plant maintenance and others
Location Indonesia Indonesia
Proportion of ownership (%) 95.00% 95.00%
KOLAT SpA    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Utility plant maintenance and others Utility plant maintenance and others
Location Chile Chile
Proportion of ownership (%) 100.00% 100.00%
KEPCO California, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
KEPCO Mojave Holdings, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
Incheon Fuel Cell Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 60.00% 60.00%
KOEN Service Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Facility maintenance and service Facility maintenance and service
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
KOMIPO Service Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Facility maintenance and service Facility maintenance and service
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
KOWEPO Service Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Facility maintenance and service Facility maintenance and service
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
KOSPO Service Co., Ltd    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Facility maintenance and service Facility maintenance and service
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
EWP Service Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Facility maintenance and service Facility maintenance and service
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
PT. KOMIPO Energy Indonesia    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Utility plant maintenance and others Utility plant maintenance and others
Location Indonesia Indonesia
Proportion of ownership (%) 95.00% 95.00%
KNF Partners Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Facility maintenance and service Facility maintenance and service
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
KOSPO USA Inc.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
Nambu USA LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
Tamra Offshore Wind Power Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 63.00% 63.00%
KEPCO MCS Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Electric meter reading and others Electric meter reading and others
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
KEPCO FMS Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Security service and others Security service and others
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
Firstkeepers Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Facility maintenance and service Facility maintenance and service
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
Secutec Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Security service Security service
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
SE Green Energy Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 84.80% 84.80%
KEPCO Mangilao America LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 0.00% 100.00%
Reason Liquidation  
Mangilao Intermediate Holdings LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
KEPCO CSC Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Facility maintenance and service Facility maintenance and service
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
KOAK Power Limited    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Hydro power facility maintenance Hydro power facility maintenance
Location Pakistan Pakistan
Proportion of ownership (%) 100.00% 100.00%
KOMIPO Europe B.V.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Netherlands Netherlands
Proportion of ownership (%) 100.00% 100.00%
Haenanum Energy Fund    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Korea Korea
Proportion of ownership (%) 99.64% 99.64%
Paju Ecoenergy Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 89.00% 89.00%
Guam Ukudu Power LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
K-SOLAR SHINAN Co., Ltd. (formerly, TS Energy No. 25 Co., Ltd.)    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 90.00% 90.00%
KPS Partners Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Facility maintenance and service Facility maintenance and service
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
KEPCO E&C Service Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Facility maintenance and service Facility maintenance and service
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
Moha Solar Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
Ogiri Solar Power Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 70.00% 70.00%
KHNP USA LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
KOMIPO Vanphong Power Service LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Utility plant maintenance and others Utility plant maintenance and others
Location Vietnam Vietnam
Proportion of ownership (%) 100.00% 100.00%
Energy Innovation Fund I    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Korea Korea
Proportion of ownership (%) 71.91% 71.91%
KHNP Chile SpA    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Chile Chile
Proportion of ownership (%) 100.00% 100.00%
Yeong Yang Apollon Photovoltaic Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
Yeong Yang Corporation Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
SolarVader Co., Ltd    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
Yeong Yang Innovation Co., Ltd    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
Yeong Yang Horus Photovoltaic Co., Ltd    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
Yeong Yang Solar Management Co., Ltd    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 100.00% 100.00%
LSG Hydro Power Limited    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Pakistan Pakistan
Proportion of ownership (%) 99.80% 99.80%
KOEN Bio Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Wood pellet utilization business Wood pellet utilization business
Location Korea Korea
Proportion of ownership (%) 70.00% 70.00%
KOMIPO Energy Solution America, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
Elara Investment Holdings, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities [7] Holding company Holding company
Location [7] USA USA
Proportion of ownership (%) [7] 0.10% 0.10%
Elara Equity Holdings, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 54.00% 54.00%
Elara Class B Holdings, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
Elara Class B Member, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
Elara Development Holdings, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
KOMIPO Development, LLC (formerly, Elara Development, LLC)    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
Elara Energy Holdings, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities [7] Holding company Holding company
Location [7] USA USA
Proportion of ownership (%) [7] 43.94% 43.94%
Elara Energy Project, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
KOMIPO Iberian Solar Group, S.L.U.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Spain Spain
Proportion of ownership (%) 100.00% 100.00%
Jeongam Wind Power Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 80.00% 80.00%
KOWEPO Europe B.V.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Netherlands Netherlands
Proportion of ownership (%) 100.00% 100.00%
CVS Equity Holdings, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 81.34% 100.00%
CVS Class B Holdings, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
CVS Development Holdings, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
CVS Development, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
CVS Class B Member, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
CVS Energy Holdings, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 70.79% 100.00%
Concho Valley Energy, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
Concho Valley Solar, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location USA USA
Proportion of ownership (%) 100.00% 100.00%
Yeongdeok Sunrise Wind Power Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Korea Korea
Proportion of ownership (%) 70.00% 70.00%
KHNP Spain, S.L.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Spain Spain
Proportion of ownership (%) 100.00% 100.00%
UI Carbon-Neutrality Fund    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Korea Korea
Proportion of ownership (%) 78.97% 0.00%
Reason Newly established  
KA Power Limited    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Pakistan Pakistan
Proportion of ownership (%) 100.00% 0.00%
Reason Newly established  
Western Power Changgi Solar Co., Ltd. (formerly, Sam-Yang Photovoltaic Power Co., Ltd.)    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities [8] Power generation Power generation
Location [8] Korea Korea
Proportion of ownership (%) [8] 100.00% 0.00%
Reason Change in the scope of consolidation  
EWP Australia Pty., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Australia Australia
Proportion of ownership (%) 100.00% 0.00%
Reason Newly established  
Columboola Solar Farm Hold Co Pty., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities [9] Power generation Power generation
Location [9] Australia Australia
Proportion of ownership (%) [9] 74.04% 0.00%
Reason New investment  
Digital Innovation Growth Fund    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities [10] Holding company Holding company
Location [10] Korea Korea
Proportion of ownership (%) [10] 76.92% 0.00%
Reason Change in the scope of consolidation  
J Wind First, LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities [11] Company specializing in liquidization Company specializing in liquidization
Location [11] Korea Korea
Proportion of ownership (%) [11] 0.00% 0.00%
Reason Newly established  
KEPCO Holding Company    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location Saudi Arabia Saudi Arabia
Proportion of ownership (%) 100.00% 0.00%
Reason Newly established  
KEPCO for Power Company    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Power generation Power generation
Location Saudi Arabia Saudi Arabia
Proportion of ownership (%) 60.00% 0.00%
Reason Newly established  
KEPCO for Maintenance Company    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Utility plant maintenance and others Utility plant maintenance and others
Location Saudi Arabia Saudi Arabia
Proportion of ownership (%) 100.00% 0.00%
Reason Newly established  
KOSPO Trumbull LLC    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities Holding company Holding company
Location USA USA
Proportion of ownership (%) 100.00% 0.00%
Reason Newly established  
Changjuk Wind Power Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Key operation activities [10] Power generation Power generation
Location [10] Korea Korea
Proportion of ownership (%) [10] 73.00% 0.00%
Reason Change in the scope of consolidation  
Seobusambo highway photovoltaics Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Reason Newly established  
Seobusambo highway photovoltaics Co., Ltd.    
Disclosure - Ownership of KEPCO and its material consolidated subsidiaries [Line Items]    
Reason Change in the scope of consolidation  
[1] Considering treasury stocks, the effective percentage of ownership is 66.08%. The Company is planning to sell part of its shares (14.77%) based on the resolution of the board of directors on June 24, 2022.
[2] The Company is planning to sell its investment in KEPCO Philippines Holdings Inc., but time or proceeds of sales are not specified as of December 31, 2022.
[3] The effective percentage of ownership is less than 50%. However, this subsidiary is included in the consolidated financial statements as the Company obtained the majority of the voting power under the shareholders’ agreement.
[4] As of the reporting date, the annual reporting period of all subsidiaries is December 31, except for Mira Power Limited.
[5] The Company guarantees a certain return on investment related to Commerce and Industry Energy Co., Ltd. for the financial investors. The financial investors have a right to sell their shares to the Company which can be exercised 36 months after the date of investment. Accordingly, the purchase price including the return on investment is classified as a liability.
[6] The subsidiary is included in the consolidated financial statements as the Company owns 50%+1 stake and has the ability to appoint a majority of the board members under the shareholders’ agreement.
[7] The effective percentage of ownership is less than 50%. However, this subsidiary is included in the consolidated financial statements as the Company has control over the board of directors under the shareholders’ agreement.
[8] For the year ended December 31, 2022, the Company included Western Power Changgi Solar Co., Ltd. as a subsidiary, considering that it acquired control over the entity after the entity undertook selective reduction of capital.
[9] Excluding preferred stocks, the percentage of ownership with voting rights is 100%.
[10] The entity was transferred from an associate to a subsidiary due to changes in the consolidated scope during the year ended December 31, 2022.
[11] Although the Company does not hold a stake as of December 31, 2022, considering the purpose and design of the structured entity, the Company is exposed to volatility in the profits of the structured entity. In addition, Group has the ability to direct activities that can most significantly affect the operations of the structured entity, so it has been determined that the Company has control over the entity.