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Summary of Significant Accounting Policies Depreciation and Amortization (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Provision for Depreciation Rate | 2.80% | 3.00%
Projected provision for depreciation in next fiscal year | 2.80% |
Percent Of Intangible Plant Balance Amortizable | 93.50% |
Percent of Intangible Plant Balance Amortizable Thereafter | 6.50% |
Transmission Equipment [Member] | OG&E [Member] |  |
Amount of Acquisition Adjustments | $ 3.3 | $ 3.3

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