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Commitments and Contingencies Commitments And Contingencies (Narrative) (Details) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 USD ($) MW | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Entergy Arkansas [Member] |  |  |
Regulatory Assets [Line Items] |  |  |
Incremental NRC Inspection Costs | $ 19.6 |  | $ 53.0
Entergy Arkansas [Member] | Subsequent Event [Member] |  |  |
Regulatory Assets [Line Items] |  |  |
Expected NRC inspection costs excluding remediation and response costs |  | $ 50.0 |
Entergy Wholesale Commodities [Member] | Pilgrim [Member] |  |  |
Regulatory Assets [Line Items] |  |  |
Incremental NRC Inspection Costs | 5.0 |  |
Entergy Wholesale Commodities [Member] | Minimum [Member] | Pilgrim [Member] |  |  |
Regulatory Assets [Line Items] |  |  |
Expected NRC inspection costs | 45.0 |  |
Entergy Wholesale Commodities [Member] | Maximum [Member] | Pilgrim [Member] |  |  |
Regulatory Assets [Line Items] |  |  |
Expected NRC inspection costs | $ 60.0 |  |
Entergy Wholesale Commodities [Member] | Subsequent Event [Member] | Pilgrim [Member] |  |  |
Regulatory Assets [Line Items] |  |  |
Expected NRC inspection costs |  | $ 30.0 |
Pilgrim [Member] |  |  |
Regulatory Assets [Line Items] |  |  |
Capacity Supply Obligations in ISO New England | MW | 677 |  |

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