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General Information (Details) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Reporting Entity (Description of the controlling company) [Abstract]    
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 January 1, 1982 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 services.  
Country of incorporation Republic of Korea.  
Information of listing on stock market KEPCO's stock was listed on the Korea Stock Exchange on August 10, 1989 and KEPCO listed its Depository Receipts (DR) on the New York Stock Exchange on October 27, 1994.  
Address of registered office of entity KEPCO's head office is located in Naju, Jeollanam-do.  
Issued capital ₩ 3,209,820 ₩ 3,209,820