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Cover
Nov. 20, 2025
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Nov. 20, 2025
Entity File Number 1-12579
Entity Registrant Name OGE ENERGY CORP.
Entity Central Index Key 0001021635
Entity Tax Identification Number 73-1481638
Entity Incorporation, State or Country Code OK
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
City Area Code 405
Local Phone Number 553-3000
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock
Trading Symbol OGE
Security Exchange Name NYSE
Entity Emerging Growth Company false