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Fair Value Measurements (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 2022 and December 31, 2021, as well as the classification level within the fair value hierarchy.
March 31,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$1,067.4 $1,067.4 $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 $489.9 $499.9 $497.8 Level 2
OG&E Senior Notes$3,852.4 $4,045.6 $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 $9.1 $9.3 $10.0 Level 3