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Short-Term Debt and Credit Facilities (Tables) | 6 Months Ended
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Jun. 30, 2021
Short-term Debt [Abstract] |
Schedule of Line of Credit Facilities [Table Text Block] | The following table presents information regarding the Registrants' revolving credit agreements at June 30, 2021.
| Aggregate | Amount | Weighted-Average |  |  |  |
Entity | Commitment | Outstanding (A) | Interest Rate |  | Expiration |  |
| (In millions) |  |  |  |  |
OGE Energy (B) | $ | 450.0 |  | $ | 284.5 |  | 0.19 | % | (E) | March 8, 2024 | (F) |
OG&E (C)(D) | 450.0 |  | 0.4 |  | 1.15 | % | (E) | March 8, 2024 | (F) |
Total | $ | 900.0 |  | $ | 284.9 |  | 0.19 | % |  |  |  |
(A)Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at June 30, 2021. (B)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)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. (D)OG&E has an intercompany borrowing agreement with OGE Energy whereby OG&E has access to up to $350.0 million of OGE Energy's revolving credit amount. This agreement has a termination date of March 8, 2024. At June 30, 2021, there were no intercompany borrowings under this agreement. (E)Represents the weighted-average interest rate for the outstanding borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit. (F)In March 2017, the Registrants entered into unsecured five-year revolving credit agreements totaling $900.0 million ($450.0 million for OGE Energy and $450.0 million for OG&E). Each of the revolving credit facilities contained an option, which could be exercised up to two times, to extend the term of the respective facility for an additional year. In March 2018, the Registrants each utilized one of those extensions to extend the maturity of their respective credit facility from March 8, 2022 to March 8, 2023. In January 2021, the Registrants each utilized the second of those extensions to extend the maturity of their respective credit facility from March 8, 2023 to March 8, 2024. Commitments of a single existing lender with respect to $50.0 million of OGE Energy's credit facility, however, were not extended and, unless the non-extending lender is replaced in accordance with the terms of the credit facility, such commitments will expire March 8, 2023. The non-extending lender is not party to the OG&E facility.

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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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