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Document And Entity Information
 12 Months Ended
Dec. 31, 2017
shares
Document and entity information [Abstract]  
Entity registrant name KOREA ELECTRIC POWER CORP
Trading Symbol KEP
Entity central index key 0000887225
Document type 20-F
Document period end date Dec. 31, 2017
Amendment flag false
Document fiscal year focus 2017
Document fiscal period focus FY
Current fiscal year end date --12-31
Entity well-known seasoned issuer Yes
Entity voluntary filers No
Entity current reporting status Yes
Entity filer category Large Accelerated Filer
Entity common stock, shares outstanding 641,964,077