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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) |  | 1 Months Ended | 9 Months Ended | 11 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 02, 2021 | Dec. 31, 2021 | Sep. 30, 2022 | Dec. 02, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Deferred Storm and Property Reserve Deficiency, Current |  |  |  |  |  | $ 2,700,000 |  |  |
Allowance for Doubtful Accounts Receivable |  | $ 2,400,000 |  |  |  | $ 1,900,000 | $ 2,400,000 |  |
Provision for Depreciation Rate |  |  |  |  |  | 2.70% | 2.60% |  |
Projected provision for depreciation in next fiscal year |  |  |  |  |  | 2.70% |  |  |
Percent Of Intangible Plant Balance Amortizable |  |  |  |  |  | 43.10% |  |  |
Percent of Intangible Plant Balance Amortizable |  |  |  |  |  | 56.30% |  |  |
Amortization of intangible assets, period |  |  |  |  |  | 6 years 8 months 12 days |  |  |
Amortization of Intangible Assets, Period |  |  |  |  |  | 13 years 9 months 18 days |  |  |
Amortization of Intangible Assets, Period |  |  |  |  |  | 22 years 4 months 24 days |  |  |
Percent of Intangible Plant Balance Amortizable Thereafter |  |  |  |  |  | 0.60% |  |  |
Accrued Environmental Loss Contingencies, Noncurrent |  | 25,800,000 |  |  |  | $ 24,200,000 | $ 25,800,000 |  |
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration] |  |  |  |  |  | Other Liabilities, Noncurrent |  |  |
Public Utilities, Allowance for Funds Used During Construction, Rate |  |  |  |  |  | 4.80% | 7.40% | 7.30% |
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party |  |  |  |  |  | $ 135,500,000 | $ 139,300,000 | $ 140,600,000 |
Equity Securities Sold During Period |  |  | 95,400,000 |  |  |  |  |  |
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 |  |  |  |  |  | 34,000,000.0 |  |  |
Equity in earnings of unconsolidated affiliates |  |  |  | $ 169,800,000 | [1] | 0 | 169,800,000 | (668,000,000.0) | [1],[2]
Gain (Loss) on Disposition of Assets |  |  |  |  |  | 0 | 344,400,000 | 0 |
Proceeds from Sales of Assets, Investing Activities | $ 35,000,000.0 |  |  |  |  |  |  |  |
Fees paid from disposition of assets | $ 8,600,000 |  |  |  |  |  |  |  |
Expected Settlement Charge |  |  |  |  |  | 5,100,000 |  |  |
Excluding Fuel Purchases [Member] |  |  |  |  |  |  |  |  |
Accounts receivable - unconsolidated affiliates |  | 300,000 |  |  |  |  | 300,000 |  |
Enable Midstream Partners [Member] |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares | 110,982,805 |  |  | 110,982,805 |  |  |  |  |
Distributions received |  |  |  |  |  |  | 73,400,000 | 91,700,000 |
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 | 148,300,000 |  |
OG&E [Member] |  |  |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable |  | 2,400,000 |  |  |  | 1,900,000 | 2,400,000 |  |
Capitalized Computer Software, Gross |  | 103,700,000 |  |  |  | 143,200,000 | 103,700,000 |  |
Capitalized Computer Software, Amortization |  |  |  |  |  | $ 23,500,000 | 18,100,000 | 14,900,000 |
OG&E [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |
Asset Retirement Obligations Accreted, Period |  |  |  |  |  | 5 years |  |  |
OG&E [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Asset Retirement Obligations Accreted, Period |  |  |  |  |  | 68 years |  |  |
OG&E [Member] | Retained Earnings [Member] |  |  |  |  |  |  |  |  |
Dividends, Common Stock |  |  |  |  |  | $ 0 | 265,000,000.0 | 325,000,000.0 |
OGE Energy [Member] |  |  |  |  |  |  |  |  |
Investment Owned, Balance, Shares | 95,389,721 |  |  | 95,389,721 |  |  |  |  |
Unrealized Gain (Loss) on Investments |  | (8,600,000) |  |  |  | 0 |  |  |
Gain (Loss) on Disposition of Assets | $ 344,400,000 |  |  |  |  |  |  |  |
OGE Energy [Member] | Enable Midstream Partners [Member] | Operating Costs Charged [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party |  |  |  | $ 300,000 |  |  |  | 400,000 |
OGE Energy [Member] | Enable Midstream Partners [Member] | Employment Costs [Member] |  |  |  |  |  |  |  |  |
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party |  |  |  |  |  |  | 12,200,000 | $ 17,300,000 |
Energy Transfer |  |  |  |  |  |  |  |  |
Proceeds from Sales of Assets, Investing Activities | 5,000,000.0 |  |  |  |  |  |  |  |
CenterPoint [Member] |  |  |  |  |  |  |  |  |
Proceeds from Sales of Assets, Investing Activities | $ 30,000,000.0 |  |  |  |  |  |  |  |
Public Utilities, Inventory, Fuel [Member] |  |  |  |  |  |  |  |  |
Fuel inventories |  | $ 40,600,000 |  |  |  | $ 108,800,000 | $ 40,600,000 |  |
[1] | For the year ended December 31, 2020, Enable recorded a $225.0 million impairment on an equity method investment, which ran through OGE Energy's portion of Enable net income and was offset by basis differences that flow through the amortization of basis difference and dilution recognition line item above.
[2] | In March 2020, OGE Energy recorded a $780.0 million impairment on its investment in Enable

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