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