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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) shares in Millions |  | 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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Deferred Storm and Property Reserve Deficiency, Current |  |  |  |  | $ 2,700,000 |  |
Allowance for Doubtful Accounts Receivable |  |  |  |  | $ 2,200,000 | $ 1,900,000 |
Provision for Depreciation Rate |  |  |  |  | 2.80% | 2.70% | 2.60%
Depreciation expense |  |  |  |  | $ 421,600,000 | $ 388,500,000 | $ 361,500,000
Projected provision for depreciation in next fiscal year |  |  |  |  | 2.80% |  |
Percent Of Intangible Plant Balance Amortizable |  |  |  |  | 45.70% |  |
Percent Of Intangible Plant Balance Amortizable Three |  |  |  |  | 10.20% |  |
Percent of Intangible Plant Balance Amortizable |  |  |  |  | 43.70% |  |
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 |  |  |  |  | 15 years |  |
Amortization of Intangible Assets, Period |  |  |  |  | 22 years 4 months 24 days |  |
Percent of Intangible Plant Balance Amortizable Thereafter |  |  |  |  | 0.40% |  |
Accrued Environmental Loss Contingencies, Noncurrent |  |  |  |  | $ 27,500,000 | $ 24,200,000 |
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration] |  |  |  |  | Other Liabilities, Noncurrent |  |
Public Utilities, Allowance for Funds Used During Construction, Rate |  |  |  |  | 7.00% | 4.80% | 7.40%
Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party |  |  |  |  | $ 148,300,000 | $ 135,500,000 | $ 139,300,000
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 | 73,400,000
Equity in earnings of unconsolidated affiliates |  |  |  | $ 169,800,000 | 0 | 0 | 169,800,000
Gain (Loss) on Disposition of Assets |  |  |  |  | 0 | 0 | 344,400,000
Proceeds from Sales of Assets, Investing Activities | $ 35,000,000 |  |  |  |  |  |
Fees paid from disposition of assets | 8,600,000 |  |  |  |  |  |
Expected Settlement Charge |  |  |  |  | 4,100,000 |  |
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 |  |  |  |  | 2,200,000 | 1,900,000 |
Capitalized Computer Software, Gross |  |  |  |  | 203,100,000 | 143,200,000 |
Capitalized Computer Software, Amortization |  |  |  |  | $ 33,400,000 | 23,500,000 | 18,100,000
OG&E [Member] | Minimum [Member] |  |  |  |  |  |  |
Asset Retirement Obligations Accreted, Period |  |  |  |  | 2 years |  |
OG&E [Member] | Maximum [Member] |  |  |  |  |  |  |
Asset Retirement Obligations Accreted, Period |  |  |  |  | 68 years |  |
OGE Energy [Member] |  |  |  |  |  |  |
Unrealized Gain (Loss) on Investments |  | $ (8,600,000) |  |  |  | 0 |
Gain (Loss) on Disposition of Assets | 344,400,000 |  |  |  |  |  |
OGE Energy [Member] | Retained Earnings [Member] |  |  |  |  |  |  |
Dividends, Common Stock |  |  |  |  | $ 500,000,000 |  | 265,000,000
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 |  |  |
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
Energy Transfer |  |  |  |  |  |  |
Proceeds from Sales of Assets, Investing Activities | 5,000,000 |  |  |  |  |  |
CenterPoint [Member] |  |  |  |  |  |  |
Proceeds from Sales of Assets, Investing Activities | $ 30,000,000 |  |  |  |  |  |
Public Utilities, Inventory, Fuel [Member] |  |  |  |  |  |  |
Fuel inventories |  |  |  |  | $ 158,500,000 | $ 108,800,000 |

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