Retirement, Other Postretirement Benefits, And Defined Contribution Plans (Expected Employer Contributions) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Entergy Arkansas [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	$ 92,523
Entergy Arkansas [Member] | Other Postretirement [Member]
Change in Plan Assets
Expected Employer Contributions	16,904
Entergy Gulf States Louisiana [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	32,455
Entergy Gulf States Louisiana [Member] | Other Postretirement [Member]
Change in Plan Assets
Expected Employer Contributions	8,921
Entergy Louisiana [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	56,960
Entergy Louisiana [Member] | Other Postretirement [Member]
Change in Plan Assets
Expected Employer Contributions	9,885
Entergy Mississippi [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	22,472
Entergy Mississippi [Member] | Other Postretirement [Member]
Change in Plan Assets
Expected Employer Contributions	535
Entergy New Orleans [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	10,910
Entergy New Orleans [Member] | Other Postretirement [Member]
Change in Plan Assets
Expected Employer Contributions	3,669
Entergy Texas [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	17,166
Entergy Texas [Member] | Other Postretirement [Member]
Change in Plan Assets
Expected Employer Contributions	3,231
System Energy [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	20,778
System Energy [Member] | Other Postretirement [Member]
Change in Plan Assets
Expected Employer Contributions	$ 475