Leases Leases (Purchase Power Agreement Minimum Lease Payments) (Details) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months		$ 31,159,000
Lessee, Operating Lease, Liability, Payments, Due Year Two	$ 52,905,000,000	31,876,000
Lessee, Operating Lease, Liability, Payments, Due Year Three	43,482,000,000	32,609,000
Lessee, Operating Lease, Liability, Payments, Due Year Four	34,768,000,000	10,180,000
Lessee, Operating Lease, Liability, Payments, Due	248,531,000,000	105,824,000
Entergy Texas [Member]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months		31,159,000
Lessee, Operating Lease, Liability, Payments, Due Year Two	2,961	31,876,000
Lessee, Operating Lease, Liability, Payments, Due Year Three	2,186	32,609,000
Lessee, Operating Lease, Liability, Payments, Due Year Four	1,196	10,180,000
Lessee, Operating Lease, Liability, Payments, Due	10,917	$ 105,824,000
Entergy Louisiana [Member]
Lessee, Operating Lease, Liability, Payments, Due Year Two	9,795
Lessee, Operating Lease, Liability, Payments, Due Year Three	8,009
Lessee, Operating Lease, Liability, Payments, Due Year Four	5,137
Lessee, Operating Lease, Liability, Payments, Due	$ 37,865