Retirement, Other Postretirement Benefits, And Defined Contribution Plans (Expected Employer Contributions) (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Other Postretirement Benefits Plan [Member]
Change in Plan Assets
Expected Employer Contributions	$ 49,100
Entergy Arkansas [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	32,512
Entergy Arkansas [Member] | Other Postretirement Benefits Plan [Member]
Change in Plan Assets
Expected Employer Contributions	509
Entergy Louisiana [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	38,766
Entergy Louisiana [Member] | Other Postretirement Benefits Plan [Member]
Change in Plan Assets
Expected Employer Contributions	18,545
Entergy Mississippi [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	7,768
Entergy Mississippi [Member] | Other Postretirement Benefits Plan [Member]
Change in Plan Assets
Expected Employer Contributions	130
Entergy New Orleans [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	3,248
Entergy New Orleans [Member] | Other Postretirement Benefits Plan [Member]
Change in Plan Assets
Expected Employer Contributions	162
Entergy Texas [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	3,549
Entergy Texas [Member] | Other Postretirement Benefits Plan [Member]
Change in Plan Assets
Expected Employer Contributions	61
System Energy [Member] | Pension Plans, Defined Benefit [Member]
Change in Plan Assets
Expected Employer Contributions	10,544
System Energy [Member] | Other Postretirement Benefits Plan [Member]
Change in Plan Assets
Expected Employer Contributions	$ 21