Credit Facilities and Short-Term Debt - Schedule of Line of Credit Facilities (Details) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)
Line of Credit Facility [Line Items]
Aggregate Commitment	$ 1,160.0
Line of Credit Outstanding, Amount	$ 561.7	[1]
Weighted - Average Interest Rate	5.92%
OGE Energy [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 550.0	[2]
Line of Credit Outstanding, Amount	$ 361.3	[1],[2]
Weighted - Average Interest Rate	5.64%	[2],[3]
Maturity	Dec. 18, 2028	[2]
OGE Energy [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 60.0	[4]
Line of Credit Outstanding, Amount	$ 0.0	[1],[4]
Weighted - Average Interest Rate	0.00%	[3],[4]
Maturity	May 24, 2027	[4]
OG&E [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 550.0	[5],[6]
Letters of Credit Outstanding, Amount	$ 200.4	[1],[5],[6]
Weighted - Average Interest Rate	6.42%	[3],[5],[6]
Maturity	Dec. 18, 2028	[5],[6]

[1] Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at June 30, 2024.

[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] OGE Energy has a $120.0 million floating rate unsecured three-year credit agreement, of which $60.0 million is considered a revolving loan, which is included in the table above, and $60.0 million is considered a term loan. The credit agreement, under certain circumstances, may be increased to a maximum commitment limit of $155.0 million and includes a maximum leverage ratio of 0.70 to 1.0. The other covenants under this credit agreement are substantially the same as OGE Energy's existing $550.0 million 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 18, 2028. At June 30, 2024, there was $116.9 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. At June 30, 2024, there was $200.0 million in outstanding borrowings at a weighted-average interest rate of 6.42 percent under the revolving credit facility, which was classified as Long-Term Debt in the Registrants' condensed balance sheet.