Retirement, Other Postretirement Benefits, And Defined Contribution Plans (Expected Employer Contributions) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)
Entergy Arkansas [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	$ 82,829
Entergy Arkansas [Member] | Other Postretirement [Member]
Change in Plan Assets
Expected Employer Contributions	4,238
Entergy Louisiana [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	83,907
Entergy Louisiana [Member] | Other Postretirement [Member]
Change in Plan Assets
Expected Employer Contributions	18,946
Entergy Mississippi [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	19,914
Entergy Mississippi [Member] | Other Postretirement [Member]
Change in Plan Assets
Expected Employer Contributions	0
Entergy New Orleans [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	10,693
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	15,771
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	20,195
System Energy [Member] | Other Postretirement [Member]
Change in Plan Assets
Expected Employer Contributions	$ 0