Rate Matters and Regulation (Details) (USD $) In Millions, unless otherwise specified							12 Months Ended
	Dec. 31, 2012 Sooner-Rose Hill Project [Member]	Dec. 31, 2012 Sunnyside-Hugo Project [Member]	Jul. 02, 2012 2011 Oklahoma Rate Case Filing [Member]	Jul. 28, 2011 2011 Oklahoma Rate Case Filing [Member]	Dec. 31, 2012 Demand and Energy Efficiency Program Filing [Member]	Dec. 31, 2012 Fuel Adjustment Clause for Calendar Year 2010 [Member]	Dec. 31, 2012 Oklahoma Corporation Commission [Member]	Dec. 31, 2012 Arkansas Public Service Commission [Member]	Dec. 31, 2012 Federal Energy Regulatory Commission [Member]	Dec. 31, 2012 Enogex [Member]	Dec. 31, 2012 Smart Grid Project [Member]	Dec. 31, 2012 ARKANSAS Smart Grid Project [Member]	Dec. 31, 2012 ARKANSAS Web Portal Access and Education [Member] Smart Grid Project [Member]
OG&E's Jurisdictional Revenues							87.00%	8.00%	5.00%
Capital expenditures for SPP projects	$ 45	$ 157
Requested Rate Increase				73.3
Requested Rate Percentage Increase				4.30%
Requested Return on Equity				11.00%
Common Equity Percentage in Determining Return on Equity				53.00%
New Capital Investments				500
Annual Net Rate Increase			4.3
Oklahoma Retail Authorized Return on Equity			10.20%
Smart Grid Cost Cap											366.4
Smart Grid Costs to be Recovered												14.0	0.8
Budget for Energy Efficiency Programs					7
Refund to Customers						0
Recommendation for Disallowed Costs						44
Recommendation for refund to customers						3
Refund payments to affected customers										$ 0.2