XML 36 R29.htm IDEA: XBRL DOCUMENT
v3.25.3

Fair Value Measurements (Tables) | 9 Months Ended
--- | ---
Sep. 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 September 30, 2025 and December 31, 2024, as well as the classification level within the fair value hierarchy.
|  | September 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 |  | $ | 347.5 |  |  | $ | 363.5 |  |  | $ | 346.9 |  |  | $ | 355.7 |  |  | Level 2
OGE Energy Term Loan |  | $ | 59.8 |  |  | $ | 60.0 |  |  | $ | 59.7 |  |  | $ | 60.0 |  |  | Level 2
OG&E Senior Notes |  | $ | 4,846.3 |  |  | $ | 4,699.3 |  |  | $ | 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 |  | $ | 11.6 |  |  | $ | 9.3 |  |  | $ | 11.7 |  |  | $ | 9.0 |  |  | Level 3

X
- 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://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-13 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
Name: | us-gaap_FairValueByBalanceSheetGroupingTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration