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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 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 previous financial instrument measured at fair value on a recurring basis and the carrying amount and fair value of the Registrants' current financial instruments at September 30, 2022 and December 31, 2021, as well as the classification level within the fair value hierarchy. As of September 30, 2022, OGE Energy had sold all of the Energy Transfer limited partner units it received as a result of the merger transaction between Enable and Energy Transfer in December 2021.
September 30,December 31,
 20222021
(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$— $— $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$500.0 $486.8 $499.9 $497.8 Level 2
OGE Energy Term Loan$49.8 $50.0 $— $— Level 2
OG&E Senior Notes$3,853.6 $3,449.4 $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 $7.1 $9.3 $10.0 Level 3