Short-Term Debt and Credit Facilities (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Line of Credit Facility [Line Items]
Short-term debt		$ 486.9	$ 95.0
Line of Credit Facility [Abstract]
Aggregate Commitment		1,100.0
Amount Outstanding	[1]	$ 487.3
Weighted Average Interest Rate		0.36%
Acceleration of Indebtedness of Credit Facility		$ 100.0
Nonpayment of Uninsured Judgments		100.0
Outstanding Intercompany Borrowings		60.0
Proceeds from (Repayments of) Related Party Debt		470.0
Debt Instrument, Face Amount		1,000.0
OGE Energy [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	[2]	550.0
Line of Credit Facility [Abstract]
Amount Outstanding	[1],[2]	$ 486.9
Weighted Average Interest Rate	[2],[3]	0.36%
Maturity	[2]	Dec. 17, 2026
Ratio of Consolidated Debt to Consolidated Capitalization		65.00%
OG&E [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	[4],[5]	$ 550.0
Line of Credit Facility [Abstract]
Letters of Credit Outstanding, Amount	[1],[4],[5]	$ 0.4
Weighted Average Interest Rate	[3],[4],[5]	1.15%
Maturity	[4],[5]	Dec. 17, 2026
Intercompany Borrowing Agreement - Maximum Borrowing Capacity		$ 350.0
Period For Which Regulatory Approval Has Been Given to Acquire Short Term Debt		2 years
Short Term Borrowing Capacity That Has Regulatory Approval		$ 800.0
Ratio of Consolidated Debt to Consolidated Capitalization		65.00%
Proceeds from Contributed Capital		$ 530.0
Advances from parent		101.3	0.0
Advances to parent		$ 0.0	$ 272.0

[1] Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at December 31, 2021.

[2] This bank facility is available to back up OGE Energy's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.  

[3] Represents the weighted-average interest rate for the outstanding borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit

[4] OG&E has an intercompany borrowing agreement with OGE Energy whereby OG&E has access to up to $350.0 million of OGE Energy's revolving credit amount. This agreement has a termination date of December 17, 2026. At December 31, 2021, there were $60.0 million in intercompany borrowings under this agreement.

[5] This bank facility is available to back up OG&E's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.