Retirement, Other Postretirement Benefits, And Defined Contribution Plans Contributions To Defined Contribution Plans (Details) - Defined Contribution Plans [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Entergy Arkansas [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 4,515	$ 4,111	$ 3,985
Entergy Louisiana [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount	6,518	5,641	5,450
Entergy Mississippi [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount	2,863	2,424	2,307
Entergy New Orleans [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount	1,115	882	795
Entergy Texas [Member]
Defined Contribution Plan, Employer Discretionary Contribution Amount	$ 2,596	$ 2,136	$ 1,992