Commitments And Contingencies (Maximum Amounts Of Possible Assessments Per Occurrence) (Details) - USD ($)	Dec. 31, 2015	Apr. 30, 2015
Commitments And Contingencies [Line Items]
Maximum total contingent obligation per incident	$ 1,400,000,000
Insurance-related Assessments [Member] | Entergy Arkansas [Member]
Commitments And Contingencies [Line Items]
Maximum total contingent obligation per incident		$ 44,600,000
Insurance-related Assessments [Member] | Entergy Louisiana [Member]
Commitments And Contingencies [Line Items]
Maximum total contingent obligation per incident		54,700,000
Insurance-related Assessments [Member] | Entergy Mississippi [Member]
Commitments And Contingencies [Line Items]
Maximum total contingent obligation per incident		100,000
Insurance-related Assessments [Member] | Entergy New Orleans [Member]
Commitments And Contingencies [Line Items]
Maximum total contingent obligation per incident		100,000
Insurance-related Assessments [Member] | System Energy [Member]
Commitments And Contingencies [Line Items]
Maximum total contingent obligation per incident		24,500,000
Insurance-related Assessments [Member] | Entergy Wholesale Commodities [Member]
Commitments And Contingencies [Line Items]
Maximum total contingent obligation per incident		$ 0