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Credit Facilities and Short-Term Debt - Schedule of Line of Credit Facilities (Parenthetical) (Details)
$ in Millions
 9 Months Ended
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 1,160.0  
Line of credit outstanding borrowing amount [1] 466.7  
Og and E [Member]    
Line of Credit Facility [Line Items]    
Intercompany Borrowing Agreement - Maximum Borrowing Capacity 450.0  
Line of Credit Facility, Current Borrowing Capacity [2],[3] 550.0  
Advances from parent $ 53.9 $ 247.6
Credit facility termination date [2],[3] Dec. 18, 2029  
OGE Energy [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Current Borrowing Capacity [4] $ 550.0  
Line of credit outstanding borrowing amount [1],[4] $ 466.3  
Credit facility termination date [4] Dec. 18, 2029  
OGE Energy [Member] | Series Due May 24, 2027 [Member]    
Line of Credit Facility [Line Items]    
Long term debt $ 120.0  
OGE Energy [Member] | Series due August 15, 2028 [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 155.0  
Debt Instrument Maximum Leverage Ratio 0.7  
OGE Energy [Member] | Credit Facility [Member] | Series Due May 24, 2027 [Member]    
Line of Credit Facility [Line Items]    
Long term debt $ 60.0  
OGE Energy [Member] | Term Loan [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Current Borrowing Capacity [5] 60.0  
Line of credit outstanding borrowing amount [1],[5] $ 0.0  
Credit facility termination date [5] May 24, 2027  
OGE Energy [Member] | Term Loan [Member] | Series Due May 24, 2027 [Member]    
Line of Credit Facility [Line Items]    
Long term debt $ 60.0  
[1] Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at September 30, 2025. Typically, OGE Energy issues commercial paper to address consolidated operational activity, and OG&E will borrow from OGE Energy under the intercompany borrowing agreement as discussed below in footnote (E).
[2] OG&E has an intercompany borrowing agreement with OGE Energy whereby OG&E has access to up to $450.0 million of OGE Energy's revolving credit amount. This agreement has a termination date of December 18, 2029. At September 30, 2025, there was $53.9 million in advances from parent, and there were no borrowings under the intercompany borrowing agreement.
[3] 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.
[4] 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.
[5] OGE Energy has a $120.0 million floating rate unsecured three-year credit agreement, of which $60.0 million is considered a revolving loan, which is included in the table above, and $60.0 million is considered a term loan. The credit agreement, under certain circumstances, may be increased to a maximum commitment limit of $155.0 million and includes a maximum leverage ratio of 0.70 to 1.0. The other covenants under this credit agreement are substantially the same as OGE Energy's existing $550.0 million revolving credit agreement.