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Credit Facilities and Short-Term Debt - Schedule of Line of Credit Facilities (Parenthetical) (Details) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2026 USD ($) | Jun. 12, 2026 USD ($) | Dec. 31, 2025 USD ($)
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 1,360,000,000 |  |
Line of credit outstanding borrowing amount | [1] | 129,500,000 |  |
Outstanding Intercompany Borrowings |  | 0 |  |
Og and E [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Intercompany Borrowing Agreement - Maximum Borrowing Capacity |  |  | $ 650,000,000 |
Line of Credit Facility, Current Borrowing Capacity | [2],[3] | 650,000,000 |  |
Advances to parent |  | $ 550,500,000 |  | $ 78,300,000
Credit facility termination date | [2],[3] | Jun. 12, 2031 |  |
OGE Energy [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | [4] | $ 650,000,000 |  |
Line of credit outstanding borrowing amount | [1],[4] | $ 129,100,000 |  |
Credit facility termination date | [4] | Jun. 12, 2031 |  |
OGE Energy [Member] | Series Due May 24, 2027 [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Long term debt |  | $ 120,000,000 |  |
OGE Energy [Member] | Series due August 15, 2028 [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  | $ 155,000,000 |  |
Debt Instrument Maximum Leverage Ratio |  | 0.7 |  |
OGE Energy [Member] | Credit Facility [Member] | Series Due May 24, 2027 [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Long term debt |  | $ 60,000,000 |  |
OGE Energy [Member] | Term Loan [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | [5] | 60,000,000 |  |
Line of credit outstanding borrowing amount | [1],[5] | $ 0 |  |
Credit facility termination date | [5] | May 24, 2027 |  |
OGE Energy [Member] | Term Loan [Member] | Series Due May 24, 2027 [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Long term debt |  | $ 60,000,000 |  |
OGE Energy [Member] | Term Loan [Member] | Series Due May 24, 2027 [Member] | Long-term Debt Due Within One Year [Member] |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Long term debt |  | $ 60,000,000 |  |
[1] | Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at June 30, 2026. 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] | On June 12, 2026, OG&E increased its intercompany borrowing agreement with OGE Energy whereby OG&E has access to up to $650.0 million of OGE Energy's revolving credit amount. This agreement has a termination date of June 12, 2031. At June 30, 2026, there were no borrowings under this agreement.
[3] | 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.
[4] | 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.
[5] | 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 $650.0 million revolving credit agreement. OGE Energy previously drew $60.0 million on the term loan, and as of June 30, 2026, the $60.0 million due May 24, 2027 is presented as Long-term Debt due within One Year in the 2026 consolidated balance sheet.

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481139/470-20-50-4 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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