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Retirement And Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2012
Other Postretirement [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Parent Company [Member] | Pension Plans Defined Benefit [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Entergy Arkansas [Member] | Pension Plans Defined Benefit [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Expected Employer Contributions
Entergy Arkansas [Member] | Other Postretirement [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Entergy Arkansas [Member] | Non-Qualified Pension Plans [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Entergy Gulf States Louisiana [Member] | Pension Plans Defined Benefit [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Expected Employer Contributions
Entergy Gulf States Louisiana [Member] | Other Postretirement [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Entergy Gulf States Louisiana [Member] | Non-Qualified Pension Plans [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Entergy Louisiana [Member] | Pension Plans Defined Benefit [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Expected Employer Contributions
Entergy Louisiana [Member] | Other Postretirement [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Entergy Louisiana [Member] | Non-Qualified Pension Plans [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Entergy Mississippi [Member] | Pension Plans Defined Benefit [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Expected Employer Contributions
Entergy Mississippi [Member] | Other Postretirement [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Entergy Mississippi [Member] | Non-Qualified Pension Plans [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Entergy New Orleans | Pension Plans Defined Benefit [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Expected Employer Contributions
Entergy New Orleans | Other Postretirement [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Entergy New Orleans | Non-Qualified Pension Plans [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Entergy Texas [Member] | Pension Plans Defined Benefit [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Expected Employer Contributions
Entergy Texas [Member] | Other Postretirement [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Entergy Texas [Member] | Non-Qualified Pension Plans [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
System Energy [Member] | Pension Plans Defined Benefit [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost
Expected Employer Contributions
System Energy [Member] | Other Postretirement [Member]
 
Defined Benefit Plan Disclosure [Line Items]  
Components Of Net Pension Cost