Rate Matters and Regulation (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Estimated Refund to SPP	$ 13.0
Securitization Authorization Requested	760.0
Securitization Fuel Purchase Request	748.9
Securitization Fuel Cost Request Prudency	739.1
Plan Investments for Customers	28.0
Requested Recovery of Capital Investment	1,200.0
Grid Enhancement
Revenue Requirement	7.0
Minimum [Member]
Lost Revenue on Plant Investments for Customers	28.9
Maximum [Member]
Lost Revenue on Plant Investments for Customers	39.3
In Favor Cooperatives [Member]
Plan Investments for Customers	11.7
In Favor Cooperatives [Member] | Minimum [Member]
Lost Revenues on Plant Investments for Customers	2.9
In Favor Cooperatives [Member] | Maximum [Member]
Lost Revenues on Plant Investments for Customers	4.5
Impact to Company [Member]
Estimated Refund to SPP	5.0
Customer Impact [Member]
Estimated Refund to SPP	$ 8.0
Oklahoma Corporation Commission [Member]
OG&E's Jurisdictional Revenues	89.00%
Arkansas Public Service Commission [Member]
OG&E's Jurisdictional Revenues	8.00%
Federal Energy Regulatory Commission [Member]
OG&E's Jurisdictional Revenues	3.00%
OKLAHOMA
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 163.5
Public Utilities, Requested Return on Equity, Percentage	10.20%
Common Equity Percentage which ROE is based	53.37%
ARKANSAS
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 4.2
Public Utilities, Approved Rate Increase (Decrease), Amount	$ 6.7