Leases Leases (Lease, Liabilities) (Details) $ in Millions	Mar. 31, 2019 USD ($)
Operating Lease, Liability, Current	$ 53,121
Finance Lease, Liability, Current	11,590
Operating Lease, Liability, Noncurrent	173,456
Finance Lease, Liability, Noncurrent	53,065
Entergy Arkansas [Member]
Operating Lease, Liability, Current	11,321
Finance Lease, Liability, Current	2,465
Operating Lease, Liability, Noncurrent	41,597
Finance Lease, Liability, Noncurrent	8,851
Entergy Louisiana [Member]
Operating Lease, Liability, Current	10,958
Finance Lease, Liability, Current	4,052
Operating Lease, Liability, Noncurrent	25,144
Finance Lease, Liability, Noncurrent	13,039
Entergy Mississippi [Member]
Operating Lease, Liability, Current	6,461
Finance Lease, Liability, Current	1,382
Operating Lease, Liability, Noncurrent	12,565
Finance Lease, Liability, Noncurrent	4,975
Entergy New Orleans [Member]
Operating Lease, Liability, Current	1,748
Finance Lease, Liability, Current	678
Operating Lease, Liability, Noncurrent	3,218
Finance Lease, Liability, Noncurrent	2,296
Entergy Texas [Member]
Operating Lease, Liability, Current	3,071
Finance Lease, Liability, Current	1,281
Operating Lease, Liability, Noncurrent	7,007
Finance Lease, Liability, Noncurrent	$ 3,708