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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2025
Fair Value Disclosures [Abstract] |
Fair Value, by Balance Sheet Grouping | The following table presents the carrying amount and fair value of the Registrants' financial instruments at June 30, 2025 and December 31, 2024, as well as the classification level within the fair value hierarchy.
|  | June 30, 2025 |  |  | December 31, 2024 |  |  |
(In millions) |  | Carrying Amount |  |  | Fair Value |  |  | Carrying Amount |  |  | Fair Value |  |  | Classification
Long-term Debt (including Long-term Debt due within one year): |  |  |  |  |  |  |  |  |  |  |  |  |  |
OGE Energy Senior Notes |  | $ | 347.2 |  |  | $ | 362.3 |  |  | $ | 346.9 |  |  | $ | 355.7 |  |  | Level 2
OGE Energy Term Loan |  | $ | 59.8 |  |  | $ | 60.0 |  |  | $ | 59.7 |  |  | $ | 60.0 |  |  | Level 2
OG&E Senior Notes |  | $ | 4,845.5 |  |  | $ | 4,596.9 |  |  | $ | 4,499.6 |  |  | $ | 4,174.9 |  |  | Level 2
OG&E Industrial Authority Bonds |  | $ | 103.0 |  |  | $ | 103.0 |  |  | $ | 135.4 |  |  | $ | 135.4 |  |  | Level 2
OG&E Tinker Debt |  | $ | 11.7 |  |  | $ | 9.0 |  |  | $ | 11.7 |  |  | $ | 9.0 |  |  | Level 3

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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 -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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