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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
shares in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Deferred Storm and Property Reserve Deficiency, Current   $ 2,700,000    
Allowance for Doubtful Accounts Receivable   $ 2,000,000 $ 2,200,000  
Provision for Depreciation Rate   2.80% 2.80% 2.70%
Depreciation expense   $ 436,600,000 $ 421,600,000 $ 388,500,000
Projected provision for depreciation in next fiscal year   2.80%    
Percent Of Intangible Plant Balance Amortizable   55.30%    
Percent of Intangible Plant Balance Amortizable   44.15%    
Amortization of intangible assets, period   13 years 1 month 6 days    
Amortization of Intangible Assets, Period   19 years 6 months    
Amortization of Intangible Assets, Period   23 years 4 months 24 days    
Percent of Intangible Plant Balance Amortizable Thereafter   0.55%    
Accrued Environmental Loss Contingencies, Noncurrent   $ 30,200,000 $ 27,500,000  
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration]   Other Liabilities, Noncurrent    
Public Utilities, Allowance for Funds Used During Construction, Rate   7.10% 7.00% 4.80%
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party     $ 148,300,000 $ 135,500,000
Equity Securities Sold During Period 95.4      
Proceeds from Sales of Equity Securities $ 1,067,200,000      
Increase (Decrease) in Debt Securities, Trading, and Equity Securities, FV-NI       282,100,000
Distributions received       34,000,000
Maximum [Member]        
Vegetation management operation and maintenance expenses   $ 38,200,000    
Regulatory asset   7,500,000    
Gas Transmission Equipment [Member]        
Amount of Acquisition Adjustments   $ 3,300,000    
Gas Transmission Equipment [Member] | Minimum [Member]        
Amortization of intangible assets, period   37 years    
Gas Transmission Equipment [Member] | Maximum [Member]        
Amortization of intangible assets, period   59 years    
Redbud Plant [Member]        
Amortization of intangible assets, period   27 years    
Amount of Acquisition Adjustments   $ 148,300,000 148,300,000  
OG&E [Member]        
Allowance for Doubtful Accounts Receivable   2,000,000 2,200,000  
Capitalized Computer Software, Gross   280,900,000 203,100,000  
Capitalized Computer Software, Amortization   32,700,000 $ 33,400,000 23,500,000
OG&E [Member] | Minimum [Member]        
Asset Retirement Obligations Accreted, Period     3 years  
OG&E [Member] | Maximum [Member]        
Asset Retirement Obligations Accreted, Period     68 years  
OGE Energy [Member]        
Unrealized Gain (Loss) on Investments       $ 0
OGE Energy [Member] | Retained Earnings [Member]        
Dividends, Common Stock   130,000,000 $ 500,000,000  
Public Utilities, Inventory, Fuel [Member]        
Fuel inventories   $ 148,300,000 $ 158,500,000