Leases Leases (Lease, Maturity) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 44,143,000,000
Finance Lease, Liability, Payments, Remainder of Fiscal Year	10,375,000,000
Lessee, Operating Lease, Liability, Payments, Due Year Two	52,905,000,000	$ 31,876,000
Finance Lease, Liability, Payments, Due Year Two	12,489,000,000
Lessee, Operating Lease, Liability, Payments, Due Year Three	43,482,000,000	32,609,000
Finance Lease, Liability, Payments, Due Year Three	10,941,000,000
Lessee, Operating Lease, Liability, Payments, Due Year Four	34,768,000,000	10,180,000
Finance Lease, Liability, Payments, Due Year Four	9,743,000,000
Lessee, Operating Lease, Liability, Payments, Due Year Five	27,974,000,000
Finance Lease, Liability, Payments, Due Year Five	8,680,000,000
Lessee, Operating Lease, Liability, Payments, Due after Year Five	45,259,000,000
Finance Lease, Liability, Payments, Due after Year Five	26,744,000,000
Lessee, Operating Lease, Liability, Payments, Due	248,531,000,000	105,824,000
Operating Lease, Cost	21,954,000,000
Finance Lease, Liability, Payments, Due	78,972,000,000
Finance Lease, Interest Payment on Liability	14,318,000,000
Present Value Net Minimum Operating Lease Payments	226,577,000,000
Present Value Net Minimum Financing Lease Payments	64,654,000,000
Entergy Arkansas [Member]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	9,285
Finance Lease, Liability, Payments, Remainder of Fiscal Year	2,071
Lessee, Operating Lease, Liability, Payments, Due Year Two	11,085
Finance Lease, Liability, Payments, Due Year Two	2,464
Lessee, Operating Lease, Liability, Payments, Due Year Three	9,137
Finance Lease, Liability, Payments, Due Year Three	2,067
Lessee, Operating Lease, Liability, Payments, Due Year Four	6,763
Finance Lease, Liability, Payments, Due Year Four	1,778
Lessee, Operating Lease, Liability, Payments, Due Year Five	5,600
Finance Lease, Liability, Payments, Due Year Five	1,551
Lessee, Operating Lease, Liability, Payments, Due after Year Five	15,713
Finance Lease, Liability, Payments, Due after Year Five	2,476
Lessee, Operating Lease, Liability, Payments, Due	57,583
Operating Lease, Cost	4,664
Finance Lease, Liability, Payments, Due	12,407
Finance Lease, Interest Payment on Liability	1,091
Present Value Net Minimum Operating Lease Payments	52,919
Present Value Net Minimum Financing Lease Payments	11,316
Entergy Louisiana [Member]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	8,316
Finance Lease, Liability, Payments, Remainder of Fiscal Year	3,302
Lessee, Operating Lease, Liability, Payments, Due Year Two	9,795
Finance Lease, Liability, Payments, Due Year Two	3,843
Lessee, Operating Lease, Liability, Payments, Due Year Three	8,009
Finance Lease, Liability, Payments, Due Year Three	3,189
Lessee, Operating Lease, Liability, Payments, Due Year Four	5,137
Finance Lease, Liability, Payments, Due Year Four	2,749
Lessee, Operating Lease, Liability, Payments, Due Year Five	3,262
Finance Lease, Liability, Payments, Due Year Five	2,301
Lessee, Operating Lease, Liability, Payments, Due after Year Five	3,346
Finance Lease, Liability, Payments, Due after Year Five	5,414
Lessee, Operating Lease, Liability, Payments, Due	37,865
Operating Lease, Cost	1,764
Finance Lease, Liability, Payments, Due	20,798
Finance Lease, Interest Payment on Liability	3,707
Present Value Net Minimum Operating Lease Payments	36,101
Present Value Net Minimum Financing Lease Payments	17,091
Entergy Mississippi [Member]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	5,231
Finance Lease, Liability, Payments, Remainder of Fiscal Year	1,159
Lessee, Operating Lease, Liability, Payments, Due Year Two	5,845
Finance Lease, Liability, Payments, Due Year Two	1,431
Lessee, Operating Lease, Liability, Payments, Due Year Three	3,886
Finance Lease, Liability, Payments, Due Year Three	1,266
Lessee, Operating Lease, Liability, Payments, Due Year Four	2,505
Finance Lease, Liability, Payments, Due Year Four	1,073
Lessee, Operating Lease, Liability, Payments, Due Year Five	1,228
Finance Lease, Liability, Payments, Due Year Five	867
Lessee, Operating Lease, Liability, Payments, Due after Year Five	2,313
Finance Lease, Liability, Payments, Due after Year Five	1,154
Lessee, Operating Lease, Liability, Payments, Due	21,008
Operating Lease, Cost	1,982
Finance Lease, Liability, Payments, Due	6,950
Finance Lease, Interest Payment on Liability	592
Present Value Net Minimum Operating Lease Payments	19,026
Present Value Net Minimum Financing Lease Payments	6,358
Entergy New Orleans [Member]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	1,036
Finance Lease, Liability, Payments, Remainder of Fiscal Year	592
Lessee, Operating Lease, Liability, Payments, Due Year Two	1,216
Finance Lease, Liability, Payments, Due Year Two	616
Lessee, Operating Lease, Liability, Payments, Due Year Three	945
Finance Lease, Liability, Payments, Due Year Three	505
Lessee, Operating Lease, Liability, Payments, Due Year Four	622
Finance Lease, Liability, Payments, Due Year Four	454
Lessee, Operating Lease, Liability, Payments, Due Year Five	460
Finance Lease, Liability, Payments, Due Year Five	407
Lessee, Operating Lease, Liability, Payments, Due after Year Five	999
Finance Lease, Liability, Payments, Due after Year Five	748
Lessee, Operating Lease, Liability, Payments, Due	5,278
Operating Lease, Cost	312
Finance Lease, Liability, Payments, Due	3,322
Finance Lease, Interest Payment on Liability	349
Present Value Net Minimum Operating Lease Payments	4,966
Present Value Net Minimum Financing Lease Payments	2,973
Entergy Texas [Member]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	2,631
Finance Lease, Liability, Payments, Remainder of Fiscal Year	1,010
Lessee, Operating Lease, Liability, Payments, Due Year Two	2,961	31,876,000
Finance Lease, Liability, Payments, Due Year Two	1,165
Lessee, Operating Lease, Liability, Payments, Due Year Three	2,186	32,609,000
Finance Lease, Liability, Payments, Due Year Three	973
Lessee, Operating Lease, Liability, Payments, Due Year Four	1,196	10,180,000
Finance Lease, Liability, Payments, Due Year Four	766
Lessee, Operating Lease, Liability, Payments, Due Year Five	839
Finance Lease, Liability, Payments, Due Year Five	633
Lessee, Operating Lease, Liability, Payments, Due after Year Five	1,104
Finance Lease, Liability, Payments, Due after Year Five	796
Lessee, Operating Lease, Liability, Payments, Due	10,917	$ 105,824,000
Operating Lease, Cost	839
Finance Lease, Liability, Payments, Due	5,343
Finance Lease, Interest Payment on Liability	354
Present Value Net Minimum Operating Lease Payments	10,078
Present Value Net Minimum Financing Lease Payments	$ 4,989