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Document and Entity Information Document
Nov. 05, 2020
Aug. 06, 2020
Entity Information [Line Items]    
Entity Central Index Key   0001021635
Document Type 8-K  
City Area Code 405  
Local Phone Number 553-3000  
Entity Emerging Growth Company false  
Title of 12(b) Security Common Stock  
Written Communications false  
Document Period End Date Nov. 05, 2020  
Entity Registrant Name OGE ENERGY CORP.  
Entity Incorporation, State or Country Code OK  
Entity File Number 1-12579  
Entity Tax Identification Number 73-1481638  
Entity Address, Address Line One 321 North Harvey  
Entity Address, Address Line Two P.O. Box 321  
Entity Address, City or Town Oklahoma City  
Entity Address, State or Province OK  
Entity Address, Postal Zip Code 73101-0321  
Soliciting Material false  
Pre-commencement Tender Offer false  
Pre-commencement Issuer Tender Offer false  
Trading Symbol OGE  
Security Exchange Name NYSE  
Amendment Flag   false