Short-Term Debt and Credit Facilities - Schedule of Line of Credit Facilities (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($)
Line of Credit Facility [Line Items]
Aggregate Commitment	$ 1,150.0
Line of Credit Outstanding, Amount	$ 499.6	[1]
Weighted - Average Interest Rate	5.77%	[2]
OGE Energy [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 550.0	[3]
Line of Credit Outstanding, Amount	$ 499.2	[1],[3]
Weighted - Average Interest Rate	5.78%	[2],[3]
Maturity	Dec. 18, 2028	[3],[4]
OGE Energy [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 50.0	[5]
Line of Credit Outstanding, Amount	$ 0.0	[1],[5]
Weighted - Average Interest Rate	0.00%	[2],[5]
Maturity	May 24, 2025	[5]
OG&E [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	$ 550.0	[6],[7]
Letters of Credit Outstanding, Amount	$ 0.4	[1],[6],[7]
Weighted - Average Interest Rate	1.20%	[2],[6],[7]
Maturity	Dec. 18, 2028	[4],[6],[7]

[1] Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at December 31, 2023

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

[3] 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.

[4] In December 2022, the Registrants entered into an amendment to their credit facility that gave each of the Registrants the option of extending such commitments for up to two additional one-year periods. On December 18, 2023, the Registrants utilized the first extension option for an additional one-year period extending the term until December 2028.

[5] OGE Energy has a $100.0 million floating rate unsecured three-year credit agreement, of which $50.0 million is considered a revolving loan and $50.0 million is considered a term loan. The credit agreement, under certain circumstances, may be increased to a maximum commitment limit of $135.0 million and includes a maximum leverage ratio of 0.65 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.

[6] 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 December 31, 2023, there was $85.1 million in intercompany borrowings under this agreement.

[7] 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.