Leases Leases (Lease, Assets) (Details) $ in Millions	Mar. 31, 2019 USD ($)
Operating Lease, Right-of-Use Asset	$ 241
Finance Lease, Right-of-Use Asset	60
Entergy Arkansas [Member]
Operating Lease, Right-of-Use Asset	52,916
Finance Lease, Right-of-Use Asset	11,317
Entergy Louisiana [Member]
Operating Lease, Right-of-Use Asset	36,066
Finance Lease, Right-of-Use Asset	16,978
Entergy Mississippi [Member]
Operating Lease, Right-of-Use Asset	18,926
Finance Lease, Right-of-Use Asset	6,358
Entergy New Orleans [Member]
Operating Lease, Right-of-Use Asset	4,961
Finance Lease, Right-of-Use Asset	2,974
Entergy Texas [Member]
Operating Lease, Right-of-Use Asset	9,991
Finance Lease, Right-of-Use Asset	$ 5,076