Retirement, Other Postretirement Benefits, And Defined Contribution Plans (Expected Employer Contributions) (Details) $ in Thousands	Dec. 31, 2018 USD ($)
Entergy Arkansas [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	$ 27,112
Entergy Arkansas [Member] | Other Postretirement Benefits Plan [Member]
Change in Plan Assets
Expected Employer Contributions	501
Entergy Louisiana [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	26,451
Entergy Louisiana [Member] | Other Postretirement Benefits Plan [Member]
Change in Plan Assets
Expected Employer Contributions	17,933
Entergy Mississippi [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	7,701
Entergy Mississippi [Member] | Other Postretirement Benefits Plan [Member]
Change in Plan Assets
Expected Employer Contributions	123
Entergy New Orleans [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	1,800
Entergy New Orleans [Member] | Other Postretirement Benefits Plan [Member]
Change in Plan Assets
Expected Employer Contributions	2,140
Entergy Texas [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	1,645
Entergy Texas [Member] | Other Postretirement Benefits Plan [Member]
Change in Plan Assets
Expected Employer Contributions	56
System Energy [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	8,285
System Energy [Member] | Other Postretirement Benefits Plan [Member]
Change in Plan Assets
Expected Employer Contributions	$ 20