Leases (Rent Expenses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 94,043
Rent Expense	47,800	$ 53,100	$ 44,400
Operating Leases, Future Minimum Payments, Due in Two Years	82,191
Operating Leases, Future Minimum Payments, Due in Three Years	75,147
Operating Leases, Future Minimum Payments, Due in Four Years	60,808
Operating Leases, Future Minimum Payments, Due in Five Years	47,391
Operating Leases, Future Minimum Payments, Due Thereafter	88,004
Operating Leases, Future Minimum Payments Due	447,584
Entergy Arkansas [Member]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	20,421
Rent Expense	6,200	7,500	8,000
Operating Leases, Future Minimum Payments, Due in Two Years	13,918
Operating Leases, Future Minimum Payments, Due in Three Years	11,931
Operating Leases, Future Minimum Payments, Due in Four Years	9,458
Operating Leases, Future Minimum Payments, Due in Five Years	7,782
Operating Leases, Future Minimum Payments, Due Thereafter	23,297
Operating Leases, Future Minimum Payments Due	86,807
Entergy Louisiana [Member]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	25,970
Rent Expense	20,200	23,000	17,800
Operating Leases, Future Minimum Payments, Due in Two Years	21,681
Operating Leases, Future Minimum Payments, Due in Three Years	19,514
Operating Leases, Future Minimum Payments, Due in Four Years	15,756
Operating Leases, Future Minimum Payments, Due in Five Years	12,092
Operating Leases, Future Minimum Payments, Due Thereafter	22,003
Operating Leases, Future Minimum Payments Due	117,016
Entergy Mississippi [Member]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	9,344
Rent Expense	4,600	5,600	4,000
Operating Leases, Future Minimum Payments, Due in Two Years	8,763
Operating Leases, Future Minimum Payments, Due in Three Years	7,186
Operating Leases, Future Minimum Payments, Due in Four Years	5,675
Operating Leases, Future Minimum Payments, Due in Five Years	2,946
Operating Leases, Future Minimum Payments, Due Thereafter	4,417
Operating Leases, Future Minimum Payments Due	38,331
Entergy New Orleans [Member]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	2,493
Rent Expense	2,500	2,500	900
Operating Leases, Future Minimum Payments, Due in Two Years	2,349
Operating Leases, Future Minimum Payments, Due in Three Years	1,901
Operating Leases, Future Minimum Payments, Due in Four Years	1,314
Operating Leases, Future Minimum Payments, Due in Five Years	1,043
Operating Leases, Future Minimum Payments, Due Thereafter	2,323
Operating Leases, Future Minimum Payments Due	11,423
Entergy Texas [Member]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	5,744
Rent Expense	3,100	3,400	2,800
Operating Leases, Future Minimum Payments, Due in Two Years	4,431
Operating Leases, Future Minimum Payments, Due in Three Years	3,625
Operating Leases, Future Minimum Payments, Due in Four Years	2,218
Operating Leases, Future Minimum Payments, Due in Five Years	1,561
Operating Leases, Future Minimum Payments, Due Thereafter	2,726
Operating Leases, Future Minimum Payments Due	20,305
System Energy [Member]
Rent Expense	$ 1,900	$ 2,200	$ 1,600