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Commitments And Contingencies (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 9 Months Ended
Jun. 30, 2013
Sep. 30, 2013
Entergy Mississippi [Member]
   
Commitments And Contingencies [Abstract]    
Property Insurance Deductible   $ 20
Entergy Arkansas [Member]
   
Commitments And Contingencies [Abstract]    
Course Of Construction Sublimit   50
Estimated Cost To Restore ANO To Service   100
Insurance Receivable 50  
Capital Expense   35
Capital Expense In Excess of Insurance Receivable   33
Operation And Maintenance Expense Incurred For ANO Recovery   13
Operation And Maintenance Expense In Excess Of Insurance Receivable   11
Incremental Deferred Refueling Outage Costs For ANO Recovery   2
Incremental Deferred Refueling Outage Costs In Excess of Insurance Receivable   1
Minimum [Member] | Entergy Mississippi [Member]
   
Commitments And Contingencies [Abstract]    
Estimated Cost To Restore Baxter Wilson To Service   25
Maximum [Member] | Entergy Mississippi [Member]
   
Commitments And Contingencies [Abstract]    
Estimated Cost To Restore Baxter Wilson To Service   $ 30