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Credit Facilities and Short-Term Debt - Schedule of Line of Credit Facilities (Parenthetical) (Details)
 3 Months Ended
Mar. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 1,160,000,000  
Line of credit outstanding borrowing amount [1] 867,100,000  
Og and E [Member]    
Line of Credit Facility [Line Items]    
Intercompany Borrowing Agreement - Maximum Borrowing Capacity 450,000,000  
Line of Credit Facility, Current Borrowing Capacity [2],[3] 550,000,000  
Advances from parent 418,400,000 $ 247,600,000
Outstanding intercompany borrowing $ 356,700,000  
Credit facility termination date [2],[3] Dec. 18, 2029  
Og and E [Member] | Revolving Credit Facility [Member]    
Line of Credit Facility [Line Items]    
Line of credit outstanding borrowing amount $ 100,000,000  
Weighted average interest rate 5.42%  
OGE Energy [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Current Borrowing Capacity [4] $ 550,000,000  
Line of credit outstanding borrowing amount [1],[4] $ 550,000,000  
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 $ 120,000,000  
OGE Energy [Member] | Series due August 15, 2028 [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 155,000,000  
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 $ 60,000,000  
OGE Energy [Member] | Term Loan [Member]    
Line of Credit Facility [Line Items]    
Line of Credit Facility, Current Borrowing Capacity [5] 60,000,000  
Line of credit outstanding borrowing amount [1],[5] $ 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 $ 60,000,000  
[1] Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at March 31, 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 March 31, 2025, there was $418.4 million in advances to parent, of which $356.7 million is 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. At March 31, 2025, there was $100.0 million in outstanding borrowings at a weighted-average interest rate of 5.42 percent under the revolving credit facility, which was classified as Long-Term Debt in the Registrants' condensed balance sheet.
[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.