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Acquisitions And Dispositions (Details) $ in Thousands	1 Months Ended		12 Months Ended
Acquisitions And Dispositions (Details) $ in Thousands	Dec. 31, 2015 USD ($) MW	Nov. 30, 2013 USD ($)	Dec. 31, 2022 $ / MWh	Dec. 31, 2015 USD ($) $ / MWh	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2007 $ / MWh
Business Acquisition [Line Items]
Gain on sale of asset / business				$ 154,037	$ 0	$ 43,569
India Point Three [Member]
Business Acquisition [Line Items]
Future payment to NYPA for power sold \| $ / MWh				6.59
Annual cap for future payment to NYPA for power sold				$ 48,000
FitzPatrick [Member]
Business Acquisition [Line Items]
Future payment to NYPA for power sold \| $ / MWh				3.91
Annual cap for future payment to NYPA for power sold				$ 24,000
Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Contingent consideration recorded as plant					72,000	72,000
Entergy Solutions District Energy [Member]
Business Acquisition [Line Items]
Proceeds from sale of business		$ 140,000
Gain on sale of asset / business		$ 44,000
Palisades [Member] \| Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Time period of PPA							15 years
Percentage of plants output covered by PPA							100.00%
Price under PPA, lower range \| $ / MWh							43.50
Average price under PPA \| $ / MWh				51
Amounts amortized to revenue				$ 15,000	$ 16,000	$ 18,000
Amounts to be amortized to revenue in year one	$ 13,000			13,000
Amounts to be amortized to revenue in year two	12,000			12,000
Amounts to be amortized to revenue in year three	8,000			8,000
Amounts to be amortized to revenue in year four	13,000			13,000
Amounts to be amortized to revenue in year five	$ 15,000			$ 15,000
Scenario, Forecast [Member] \| Palisades [Member] \| Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Price under PPA, upper range \| $ / MWh			61.50
Rhode Island State Energy Center [Member]
Business Acquisition [Line Items]
Capacity Of Power Plant Unit \| MW	583
Proceeds from sale of business	$ 490,000
Gain on sale of asset / business	$ 154,000