Credit Facilities and Short-Term Debt - Schedule of Line of Credit Facilities (Details) $ in Millions	6 Months Ended
	Jun. 30, 2025 USD ($)
Line of Credit Facility [Line Items]
Aggregate Commitment	$ 1,160.0
Line of Credit Outstanding, Amount	$ 534.9	[1]
Weighted - Average Interest Rate	4.70%	[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	$ 534.5	[1],[3]
Weighted - Average Interest Rate	4.71%	[2],[3]
Maturity	Dec. 18, 2029	[3]
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%	[2],[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	$ 0.4	[1],[5],[6]
Weighted - Average Interest Rate	1.20%	[2],[5],[6]
Maturity	Dec. 18, 2029	[5],[6]

[1] Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at June 30, 2025. Typically, OGE Energy issues commercial paper to address consolidated operational activity, and OG&E will borrow from OGE Energy under the intercompany borrowing agreement as discussed below in footnote (E).

[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] 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, 2029. At June 30, 2025, there was $42.3 million in advances to parent, and there were no borrowings under the intercompany borrowing 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.