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Common Equity Automatic Dividend Reinvestment and Stock Purchase Plan (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Proceeds From Issuance of Shares Under Dividend Reinvestment Plan And Stock Purchase Plan $ 3.2us-gaap_StockIssuedDuringPeriodValueNewIssues $ 3.4us-gaap_StockIssuedDuringPeriodValueNewIssues
Automatic Dividend Reinvestment and Stock Purchase Plan [Member]    
Stock Issued During Period, Shares, Dividend Reinvestment Plan and Stock Purchase Plan 89,868us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_PlanNameAxis
= oge_AutomaticDividendReinvestmentAndStockPurchasePlanMember		  
Proceeds From Issuance of Shares Under Dividend Reinvestment Plan And Stock Purchase Plan $ 3.2us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_PlanNameAxis
= oge_AutomaticDividendReinvestmentAndStockPurchasePlanMember		  
Shares Held in Reserve Related to Dividend Reinvestment Plan and Stock Purchase Plan 4,901,944us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= oge_AutomaticDividendReinvestmentAndStockPurchasePlanMember