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Short-Term Debt and Credit Facilities (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Line of Credit Facility [Line Items] |  |  |  |  |
Short-term debt |  |  | $ 384.5 |  | $ 95.0
Line of Credit Facility [Abstract] |  |  |  |  |
Aggregate Commitment |  |  | 900.0 |  |
Long-term Line of Credit | [1] |  | $ 284.9 |  |
Weighted Average Interest Rate |  |  | 0.19% |  |
Debt Instrument, Face Amount |  |  | $ 1,000.0 |  |
Proceeds from Contributed Capital |  | $ 530.0 |  |  |
OGE Energy [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | [2] |  | 450.0 |  |
Line of Credit Facility [Abstract] |  |  |  |  |
Long-term Line of Credit | [1],[2] |  | $ 284.5 |  |
Weighted Average Interest Rate | [2],[3] |  | 0.19% |  |
Maturity | [2],[4] |  | Mar. 08, 2024 |  |
OGE Energy [Member] | Not Extended |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity |  |  | $ 50.0 |  |
Line of Credit Facility [Abstract] |  |  |  |  |
Maturity |  |  | Mar. 08, 2023 |  |
OG&E [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Line of Credit Facility, Current Borrowing Capacity | [5],[6] |  | $ 450.0 |  |
Line of Credit Facility [Abstract] |  |  |  |  |
Letters of Credit Outstanding, Amount | [1],[5],[6] |  | $ 0.4 |  |
Weighted Average Interest Rate | [3],[5],[6] |  | 1.15% |  |
Maturity | [4],[5],[6] |  | Mar. 08, 2024 |  |
Short Term Borrowing Capacity That Has Regulatory Approval |  |  | $ 800.0 |  |
Period For Which Regulatory Approval Has Been Given to Acquire Short Term Debt |  |  | 2 years |  |
Intercompany borrowing agreement, maximum borrowing capacity |  |  | $ 350.0 |  |
Outstanding intercompany borrowings |  |  | 0.0 |  |
Proceeds from Loans |  |  | 470.0 |  |
Advances to parent |  |  | 118.0 |  | $ 272.0
Proceeds from Contributed Capital |  |  | $ 530.0 | $ 0.0 |
[1] | Includes direct borrowings under the revolving credit agreements, commercial paper borrowings and letters of credit at June 30, 2021.
[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] | 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.
[5] | 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.
[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.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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