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Common Equity Automatic Dividend Reinvestment and Stock Purchase Plan (Details) (USD $)
In Millions, except Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Proceeds From Issuance of Shares Under Dividend Reinvestment Plan And Stock Purchase Plan $ 13.2us-gaap_StockIssuedDuringPeriodValueNewIssues $ 14.2us-gaap_StockIssuedDuringPeriodValueNewIssues $ 14.3us-gaap_StockIssuedDuringPeriodValueNewIssues
Automatic Dividend Reinvestment and Stock Purchase Plan [Member]      
Stock Issued During Period, Shares, Dividend Reinvestment Plan and Stock Purchase Plan 366,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_PlanNameAxis
= oge_AutomaticDividendReinvestmentAndStockPurchasePlanMember		    
Proceeds From Issuance of Shares Under Dividend Reinvestment Plan And Stock Purchase Plan $ 13.2us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_PlanNameAxis
= oge_AutomaticDividendReinvestmentAndStockPurchasePlanMember		    
Shares Held in Reserve Related to Dividend Reinvestment Plan and Stock Purchase Plan 4,991,812us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= oge_AutomaticDividendReinvestmentAndStockPurchasePlanMember