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