Commitments And Contingencies (Maximum Amounts Of Possible Assessments Per Occurrence) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Commitments And Contingencies [Line Items]
Maximum total contingent obligation per incident	1,300.00
Insurance-related Assessments [Member] | Entergy Wholesale Commodities [Member]
Commitments And Contingencies [Line Items]
Maximum total contingent obligation per incident
Insurance-related Assessments [Member] | Utility Plants [Member] | Entergy Arkansas [Member]
Commitments And Contingencies [Line Items]
Maximum total contingent obligation per incident	21.90
Insurance-related Assessments [Member] | Utility Plants [Member] | Entergy Gulf States Louisiana [Member]
Commitments And Contingencies [Line Items]
Maximum total contingent obligation per incident	18.90
Insurance-related Assessments [Member] | Utility Plants [Member] | Entergy Louisiana [Member]
Commitments And Contingencies [Line Items]
Maximum total contingent obligation per incident	22.00
Insurance-related Assessments [Member] | Utility Plants [Member] | Entergy Mississippi [Member]
Commitments And Contingencies [Line Items]
Maximum total contingent obligation per incident	0.07
Insurance-related Assessments [Member] | Utility Plants [Member] | Entergy New Orleans [Member]
Commitments And Contingencies [Line Items]
Maximum total contingent obligation per incident	0.07
Insurance-related Assessments [Member] | Utility Plants [Member] | Entergy Texas [Member]
Commitments And Contingencies [Line Items]
Maximum total contingent obligation per incident	N/A
Insurance-related Assessments [Member] | Utility Plants [Member] | System Energy [Member]
Commitments And Contingencies [Line Items]
Maximum total contingent obligation per incident	18.40