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Long-Term Debt (Details)
$ in Millions
9 Months Ended
Sep. 30, 2022
USD ($)
Debt Instrument [Line Items]  
Percent of Principal Amount Subject to Optional Tender 100.00%
Long-term Debt, Weighted Average Interest Rate, at Point in Time 3.23%
Line of Credit Facility, Maximum Borrowing Capacity $ 1,150.0
Garfield Industrial Authority Bond [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Maturity Date Jan. 01, 2025
Muskogee Industrial Authority Bond Due 2025 [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Maturity Date Jan. 01, 2025
Muskogee Industrial Authority Bond Due 2027 [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Maturity Date Jun. 01, 2027
Redeemable during the next 12 months  
Debt Instrument [Line Items]  
Long-term Debt $ 135.4
OG&E [Member]  
Debt Instrument [Line Items]  
Maturity Dec. 17, 2026 [1],[2]
OG&E [Member] | Redeemable during the next 12 months | Garfield Industrial Authority Bond [Member]  
Debt Instrument [Line Items]  
Long term debt $ 47.0
OG&E [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2025 [Member]  
Debt Instrument [Line Items]  
Long term debt 32.4
OG&E [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2027 [Member]  
Debt Instrument [Line Items]  
Long term debt $ 56.0
OGE Energy [Member]  
Debt Instrument [Line Items]  
Maturity Dec. 17, 2026 [3]
OGE Energy [Member] | Term Loan  
Debt Instrument [Line Items]  
Maturity May 24, 2025 [4]
OGE Energy [Member] | Series Due August 15, 2028 [Member]  
Debt Instrument [Line Items]  
Long term debt $ 100.0
Line of Credit Facility, Maximum Borrowing Capacity 135.0
OGE Energy [Member] | Series Due August 15, 2028 [Member] | Term Loan  
Debt Instrument [Line Items]  
Long term debt 50.0
OGE Energy [Member] | Series Due August 15, 2028 [Member] | credit facility  
Debt Instrument [Line Items]  
Long term debt $ 50.0
Minimum [Member] | Redeemable during the next 12 months | Garfield Industrial Authority Bond [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Interest Rate, Stated Percentage 0.11%
Minimum [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2025 [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Interest Rate, Stated Percentage 0.11%
Minimum [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2027 [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Interest Rate, Stated Percentage 0.11%
Maximum [Member] | Redeemable during the next 12 months | Garfield Industrial Authority Bond [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Interest Rate, Stated Percentage 2.65%
Maximum [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2025 [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Interest Rate, Stated Percentage 2.60%
Maximum [Member] | Redeemable during the next 12 months | Muskogee Industrial Authority Bond Due 2027 [Member]  
Debt Instrument [Line Items]  
Debt Instrument, Interest Rate, Stated Percentage 2.65%
[1] OG&E has an intercompany borrowing agreement with OGE Energy whereby OG&E has access to up to $450.0 million of OGE Energy's revolving credit amount. This agreement has a termination date of December 17, 2026. At September 30, 2022, there were $47.6 million in intercompany borrowings under this agreement.
[2] This bank facility is available to back up OG&E's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility. 
[3] This bank facility is available to back up OGE Energy's commercial paper borrowings and to provide revolving credit borrowings. This bank facility can also be used as a letter of credit facility.(C)See Note 9 for further information about this revolving credit agreement.
[4] See Note 9 for further information about this revolving credit agreement.