Leases Lease, Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Operating Lease, Right-of-Use Asset	$ 230,000	$ 234,000
Finance Lease, Right-of-Use Asset	60,000	61,000
Entergy Louisiana [Member]
Operating Lease, Right-of-Use Asset	43,189	36,034
Finance Lease, Right-of-Use Asset	16,425	17,209
Entergy Mississippi [Member]
Operating Lease, Right-of-Use Asset	16,538	16,900
Finance Lease, Right-of-Use Asset	7,452	6,869
Entergy New Orleans [Member]
Operating Lease, Right-of-Use Asset	5,222	3,878
Finance Lease, Right-of-Use Asset	3,428	3,291
Entergy Texas [Member]
Operating Lease, Right-of-Use Asset	14,738	14,020
Finance Lease, Right-of-Use Asset	5,719	5,273
Entergy Arkansas [Member]
Operating Lease, Right-of-Use Asset	55,840	52,317
Finance Lease, Right-of-Use Asset	$ 12,447	$ 11,216