Leases Lease, Maturity (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Lessee, Operating Lease, Liability, Payments, Due Year Two	$ 57,497
Finance Lease, Liability, Payments, Due Year Two	13,175
Lessee, Operating Lease, Liability, Payments, Due Year Three	46,540
Finance Lease, Liability, Payments, Due Year Three	12,114
Lessee, Operating Lease, Liability, Payments, Due Year Four	38,525
Finance Lease, Liability, Payments, Due Year Four	10,013
Lessee, Operating Lease, Liability, Payments, Due Year Five	20,269
Finance Lease, Liability, Payments, Due Year Five	8,225
Lessee, Operating Lease, Liability, Payments, Due after Year Five	20,999
Finance Lease, Liability, Payments, Due after Year Five	16,436
Lessee, Operating Lease, Liability, Payments, Due	249,523
Finance Lease, Liability, Payments, Due	74,399
Operating Lease, Cost	19,539
Finance Lease, Interest Payment on Liability	9,675
Present Value Net Minimum Operating Lease Payments	229,984
Present Value Net Minimum Financing Lease Payments	64,724
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	65,693
Finance Lease, Liability, Payments, Due Next Twelve Months	14,436
Entergy Louisiana [Member]
Lessee, Operating Lease, Liability, Payments, Due Year Two	10,581
Finance Lease, Liability, Payments, Due Year Two	3,856
Lessee, Operating Lease, Liability, Payments, Due Year Three	8,624
Finance Lease, Liability, Payments, Due Year Three	3,437
Lessee, Operating Lease, Liability, Payments, Due Year Four	6,466
Finance Lease, Liability, Payments, Due Year Four	2,493
Lessee, Operating Lease, Liability, Payments, Due Year Five	3,693
Finance Lease, Liability, Payments, Due Year Five	1,783
Lessee, Operating Lease, Liability, Payments, Due after Year Five	3,717
Finance Lease, Liability, Payments, Due after Year Five	1,893
Lessee, Operating Lease, Liability, Payments, Due	46,157
Finance Lease, Liability, Payments, Due	17,767
Operating Lease, Cost	2,963
Finance Lease, Interest Payment on Liability	1,343
Present Value Net Minimum Operating Lease Payments	43,194
Present Value Net Minimum Financing Lease Payments	16,424
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	13,076
Finance Lease, Liability, Payments, Due Next Twelve Months	4,305
Entergy Mississippi [Member]
Lessee, Operating Lease, Liability, Payments, Due Year Two	4,890
Finance Lease, Liability, Payments, Due Year Two	1,665
Lessee, Operating Lease, Liability, Payments, Due Year Three	2,788
Finance Lease, Liability, Payments, Due Year Three	1,483
Lessee, Operating Lease, Liability, Payments, Due Year Four	1,749
Finance Lease, Liability, Payments, Due Year Four	1,156
Lessee, Operating Lease, Liability, Payments, Due Year Five	872
Finance Lease, Liability, Payments, Due Year Five	885
Lessee, Operating Lease, Liability, Payments, Due after Year Five	1,927
Finance Lease, Liability, Payments, Due after Year Five	1,027
Lessee, Operating Lease, Liability, Payments, Due	18,409
Finance Lease, Liability, Payments, Due	8,073
Operating Lease, Cost	1,804
Finance Lease, Interest Payment on Liability	621
Present Value Net Minimum Operating Lease Payments	16,605
Present Value Net Minimum Financing Lease Payments	7,452
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	6,183
Finance Lease, Liability, Payments, Due Next Twelve Months	1,857
Entergy New Orleans [Member]
Lessee, Operating Lease, Liability, Payments, Due Year Two	1,256
Finance Lease, Liability, Payments, Due Year Two	729
Lessee, Operating Lease, Liability, Payments, Due Year Three	1,028
Finance Lease, Liability, Payments, Due Year Three	684
Lessee, Operating Lease, Liability, Payments, Due Year Four	773
Finance Lease, Liability, Payments, Due Year Four	561
Lessee, Operating Lease, Liability, Payments, Due Year Five	406
Finance Lease, Liability, Payments, Due Year Five	456
Lessee, Operating Lease, Liability, Payments, Due after Year Five	694
Finance Lease, Liability, Payments, Due after Year Five	523
Lessee, Operating Lease, Liability, Payments, Due	5,690
Finance Lease, Liability, Payments, Due	3,743
Operating Lease, Cost	465
Finance Lease, Interest Payment on Liability	316
Present Value Net Minimum Operating Lease Payments	5,225
Present Value Net Minimum Financing Lease Payments	3,427
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	1,533
Finance Lease, Liability, Payments, Due Next Twelve Months	790
Entergy Texas [Member]
Lessee, Operating Lease, Liability, Payments, Due Year Two	3,705
Finance Lease, Liability, Payments, Due Year Two	1,258
Lessee, Operating Lease, Liability, Payments, Due Year Three	3,299
Finance Lease, Liability, Payments, Due Year Three	1,119
Lessee, Operating Lease, Liability, Payments, Due Year Four	2,313
Finance Lease, Liability, Payments, Due Year Four	882
Lessee, Operating Lease, Liability, Payments, Due Year Five	1,037
Finance Lease, Liability, Payments, Due Year Five	677
Lessee, Operating Lease, Liability, Payments, Due after Year Five	657
Finance Lease, Liability, Payments, Due after Year Five	759
Lessee, Operating Lease, Liability, Payments, Due	15,661
Finance Lease, Liability, Payments, Due	6,185
Operating Lease, Cost	915
Finance Lease, Interest Payment on Liability	467
Present Value Net Minimum Operating Lease Payments	14,746
Present Value Net Minimum Financing Lease Payments	5,718
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	4,650
Finance Lease, Liability, Payments, Due Next Twelve Months	1,490
Entergy Arkansas [Member]
Lessee, Operating Lease, Liability, Payments, Due Year Two	11,547
Finance Lease, Liability, Payments, Due Year Two	2,712
Lessee, Operating Lease, Liability, Payments, Due Year Three	9,868
Finance Lease, Liability, Payments, Due Year Three	2,441
Lessee, Operating Lease, Liability, Payments, Due Year Four	8,524
Finance Lease, Liability, Payments, Due Year Four	1,978
Lessee, Operating Lease, Liability, Payments, Due Year Five	6,993
Finance Lease, Liability, Payments, Due Year Five	1,498
Lessee, Operating Lease, Liability, Payments, Due after Year Five	10,737
Finance Lease, Liability, Payments, Due after Year Five	1,843
Lessee, Operating Lease, Liability, Payments, Due	61,196
Finance Lease, Liability, Payments, Due	13,485
Operating Lease, Cost	5,340
Finance Lease, Interest Payment on Liability	1,037
Present Value Net Minimum Operating Lease Payments	55,856
Present Value Net Minimum Financing Lease Payments	12,448
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	13,527
Finance Lease, Liability, Payments, Due Next Twelve Months	$ 3,013