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Reporting Entity (Description of the controlling company) - Additional Information (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Statement [Line Items]    
Name of reporting entity or other means of identification Korea Electric Power Corporation and subsidiaries  
Name of parent entity Korea Electric Power Corporation  
Entity Incorporation, Date of Incorporation Incorporated on December 31, 1981 in accordance with the Korea Electric Power Corporation Act (the “KEPCO Act”)  
Description of nature of entity's operations and principal activities Engage in the generation, transmission and distribution of electricity and development of electric power resources. KEPCO also provides power plant construction service  
Country of incorporation Republic of Korea  
Information of listing on stock market KEPCO’s stock was first listed on the Korea Stock Exchange on August 10, 1989 and subsequently on the New York Stock Exchange on October 27, 1994 through its depository receipts.  
Address of registered office of entity KEPCO’s headquarters is located in Naju-si, Jeollanam-do.  
Issued capital ₩ 3,209,820 ₩ 3,209,820