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Rate Matters and Regulation (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Oklahoma Corporation Commission [Member] |  |  |
OG&E's Jurisdictional Revenues | 86.00% |  |
Arkansas Public Service Commission [Member] |  |  |
OG&E's Jurisdictional Revenues | 8.00% |  |
Federal Energy Regulatory Commission [Member] |  |  |
OG&E's Jurisdictional Revenues | 6.00% |  |
Regional Haze [Member] |  |  |
Estimated Environmental Capital Costs | $ 1,100.0 |  |
SmartHours Program [Member] |  |  |
Lost Revenue Associated with Customer Programs | 14.9 | $ 11.6 | $ 10.1
Oklahoma Public Utility Division Staff [Member] | SmartHours Program [Member] |  |  |
Lost Revenue Associated with Customer Programs |  |  | 4.9
Reduction of Revenue |  |  | $ 5.2
Environmental Compliance Plan [Member] |  |  |
Public Utilities, Property, Plant and Equipment, Construction Work in Progress | 94.8 |  |
Expected Construction Work in Progress Costs | 35.0 |  |
OKLAHOMA |  |  |
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 92.5 |  |
Public Utilities, Requested Return on Equity, Percentage | 10.25% |  |
Investments Since Last Rate Case | $ 1,600.0 |  |

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