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Short-Term Debt and Credit Facilities (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2020
Apr. 01, 2020
Dec. 31, 2019
Line of Credit Facility [Line Items]      
Short-term debt $ 75.0   $ 112.0
Line of Credit Facility [Abstract]      
Aggregate Commitment 900.0    
Long-term Line of Credit [1] $ 0.3    
Weighted Average Interest Rate 1.15% 1.25%  
Short-term Bank Loans and Notes Payable $ 75.0    
OGE Energy [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Current Borrowing Capacity [2] 450.0    
Line of Credit Facility [Abstract]      
Long-term Line of Credit [1],[2] $ 0.0    
Weighted Average Interest Rate [2],[3] 0.00%    
Maturity [2] Mar. 08, 2023    
OG&E [Member]      
Line of Credit Facility [Line Items]      
Line of Credit Facility, Current Borrowing Capacity [4] $ 450.0    
Line of Credit Facility [Abstract]      
Letters of Credit Outstanding, Amount [1],[4] $ 0.3    
Weighted Average Interest Rate [3],[4] 1.15%    
Maturity [4] Mar. 08, 2023    
Short Term Borrowing Capacity That Has Regulatory Approval $ 800.0    
Period For Which Regulatory Approval Has Been Given to Acquire Short Term Debt 2 years    
[1] Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at June 30, 2020.
[2] This bank facility is available to back up the Company's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.  
[3] Represents the weighted-average interest rate for the outstanding borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit.
[4] 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.