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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2022
Fair Value Disclosures [Abstract] |
Schedule of Fair Value and Carrying Amount of PRM Financial Instruments [Table Text Block] | The following table presents OGE Energy's financial instrument measured at fair value on a recurring basis and the carrying amount and fair value of the Registrants' financial instruments at June 30, 2022 and December 31, 2021, as well as the classification level within the fair value hierarchy.
| June 30, | December 31, |
| 2022 | 2021 |
(In millions) | Carrying Amount | Fair Value | Carrying Amount | Fair Value | Classification
Financial instrument measured at fair value on a recurring basis: |  |  |  |  |
OGE Energy investment in Energy Transfer's equity securities (A) | $ | 382.0 |  | $ | 382.0 |  | $ | 785.1 |  | $ | 785.1 |  | Level 1
Financial instruments for which fair value is only disclosed: |  |  |  |  |
Long-term Debt (including Long-term Debt due within one year): |  |  |  |  |
OGE Energy Senior Notes | $ | 499.9 |  | $ | 487.3 |  | $ | 499.9 |  | $ | 497.8 |  | Level 2
OGE Energy Term Loan | $ | 49.8 |  | $ | 50.0 |  | $ | — |  | $ | — |  | Level 2
OG&E Senior Notes | $ | 3,853.0 |  | $ | 3,720.9 |  | $ | 3,851.8 |  | $ | 4,460.2 |  | Level 2
OG&E Industrial Authority Bonds | $ | 135.4 |  | $ | 135.4 |  | $ | 135.4 |  | $ | 135.4 |  | Level 2
OG&E Tinker Debt | $ | 9.3 |  | $ | 7.8 |  | $ | 9.3 |  | $ | 10.0 |  | Level 3
(A)As of June 30, 2022, OGE Energy has sold 57.1 million of the 95.4 million Energy Transfer limited partner units it received as a result of the merger transaction between Enable and Energy Transfer in December 2021.

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13467-108611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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