Short-Term Debt and Credit Facilities (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2022	Dec. 31, 2021
Line of Credit Facility [Line Items]
Short-term debt		$ 425.4	$ 486.9
Line of Credit Facility [Abstract]
Aggregate Commitment		1,150.0
Long-term Line of Credit	[1]	$ 425.8
Weighted Average Interest Rate		2.06%
Intercompany Borrowing Agreement - Maximum Borrowing Capacity		$ 450.0
Outstanding Intercompany Borrowings		409.0
OGE Energy [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	[2]	550.0
Line of Credit Facility [Abstract]
Long-term Line of Credit	[1],[2]	$ 334.5
Weighted Average Interest Rate	[2],[3]	2.06%
Maturity	[2]	Dec. 17, 2026
OGE Energy [Member] | Term Loan
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	[4]	$ 50.0
Line of Credit Facility [Abstract]
Long-term Line of Credit	[4]	$ 0.0
Weighted Average Interest Rate	[3],[4]	0.00%
Maturity	[4]	May 24, 2025
OG&E [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	[5],[6]	$ 550.0
Short-term debt		90.9	0.0
Line of Credit Facility [Abstract]
Letters of Credit Outstanding, Amount	[1],[5],[6]	$ 91.3
Weighted Average Interest Rate	[5],[6]	2.06%
Maturity	[5],[6]	Dec. 17, 2026
Short Term Borrowing Capacity That Has Regulatory Approval		$ 800.0
Period For Which Regulatory Approval Has Been Given to Acquire Short Term Debt		2 years
Advances from parent		$ 263.8	$ 101.3

[1] Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at June 30, 2022.

[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.(C)See Note 9 for further information about this revolving credit agreement.

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

[4] See Note 9 for further information about this revolving credit agreement.

[5] OG&E has an intercompany borrowing agreement with OGE Energy whereby OG&E has access to up to $450.0 million of OGE Energy's revolving credit amount. This agreement has a termination date of December 17, 2026. At June 30, 2022, there were $409.0 million in intercompany borrowings under this agreement.

[6] 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.