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Credit Facilities and Short-Term Debt - Additional Information (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 12, 2026
Jun. 30, 2026
Line of Credit Facility [Line Items]    
Maximum revolving commitment   $ 1,360.0
Revolving Credit Facility [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of credit facility, description   OGE Energy and OG&E have the right to request an extension of the revolving credit facility termination date under their respective facility for an additional one-year period, which extension option can be exercised up to two times. All such extension requests are subject to majority lender group approval (and only the commitments of those lenders that consent to such extension (or that agree to replace any non-consenting lender) will be extended for such additional period).
OG&E [Member]    
Line of Credit Facility [Line Items]    
Line of credit facility, current borrowing capacity [1],[2]   $ 650.0
Credit facility termination date [1],[2]   Jun. 12, 2031
Short Term Borrowing Capacity That Has Regulatory Approval   $ 1,000.0
OG&E [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Letters of credit maximum amount $ 100.0  
OG&E [Member] | Line of Credit [Member] | Maximum [Member]    
Line of Credit Facility [Line Items]    
Facility fee percentage 0.225%  
OG&E [Member] | Line of Credit [Member] | Maximum [Member] | SOFR [Member]    
Line of Credit Facility [Line Items]    
Interest rates 1.275%  
OG&E [Member] | Line of Credit [Member] | Maximum [Member] | Base Rate [Member]    
Line of Credit Facility [Line Items]    
Interest rates 0.275%  
OG&E [Member] | Line of Credit [Member] | Minimum [Member]    
Line of Credit Facility [Line Items]    
Facility fee percentage 0.06%  
OG&E [Member] | Line of Credit [Member] | Minimum [Member] | SOFR [Member]    
Line of Credit Facility [Line Items]    
Interest rates 0.69%  
OG&E [Member] | Line of Credit [Member] | Minimum [Member] | Base Rate [Member]    
Line of Credit Facility [Line Items]    
Interest rates 0.00%  
OG&E [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of credit facility, current borrowing capacity $ 650.0  
Maximum revolving commitment $ 800.0  
Debt instrument term 5 years  
Credit facility termination date Jun. 12, 2031  
OGE Energy [Member]    
Line of Credit Facility [Line Items]    
Line of credit facility, current borrowing capacity [3]   $ 650.0
Credit facility termination date [3]   Jun. 12, 2031
OGE Energy [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Letters of credit maximum amount $ 100.0  
OGE Energy [Member] | Line of Credit [Member] | Maximum [Member]    
Line of Credit Facility [Line Items]    
Facility fee percentage 0.275%  
OGE Energy [Member] | Line of Credit [Member] | Maximum [Member] | SOFR [Member]    
Line of Credit Facility [Line Items]    
Interest rates 1.475%  
OGE Energy [Member] | Line of Credit [Member] | Maximum [Member] | Base Rate [Member]    
Line of Credit Facility [Line Items]    
Interest rates 0.475%  
OGE Energy [Member] | Line of Credit [Member] | Minimum [Member]    
Line of Credit Facility [Line Items]    
Facility fee percentage 0.075%  
OGE Energy [Member] | Line of Credit [Member] | Minimum [Member] | SOFR [Member]    
Line of Credit Facility [Line Items]    
Interest rates 0.80%  
OGE Energy [Member] | Line of Credit [Member] | Minimum [Member] | Base Rate [Member]    
Line of Credit Facility [Line Items]    
Interest rates 0.00%  
OGE Energy [Member] | Revolving Credit Facility [Member] | Line of Credit [Member]    
Line of Credit Facility [Line Items]    
Line of credit facility, current borrowing capacity $ 650.0  
Maximum revolving commitment $ 800.0  
Debt instrument term 5 years  
Credit facility termination date Jun. 12, 2031  
[1] On June 12, 2026, OG&E increased its intercompany borrowing agreement with OGE Energy whereby OG&E has access to up to $650.0 million of OGE Energy's revolving credit amount. This agreement has a termination date of June 12, 2031. At June 30, 2026, there were no borrowings under this agreement.
[2] This bank facility is available to back up OG&E's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.
[3] This bank facility is available to back up OGE Energy's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.