Leases Leases (Lease, Cost) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Operating Lease, Expense	$ 15,720
Finance Lease, Right-of-Use Asset, Amortization	2,912
Finance Lease, Interest Expense	753
Entergy Arkansas [Member]
Operating Lease, Expense	3,295
Finance Lease, Right-of-Use Asset, Amortization	629
Finance Lease, Interest Expense	105
Entergy Louisiana [Member]
Operating Lease, Expense	3,026
Finance Lease, Right-of-Use Asset, Amortization	1,025
Finance Lease, Interest Expense	152
Entergy Mississippi [Member]
Operating Lease, Expense	1,753
Finance Lease, Right-of-Use Asset, Amortization	348
Finance Lease, Interest Expense	59
Entergy New Orleans [Member]
Operating Lease, Expense	357
Finance Lease, Right-of-Use Asset, Amortization	176
Finance Lease, Interest Expense	30
Entergy Texas [Member]
Operating Lease, Expense	1,085
Finance Lease, Right-of-Use Asset, Amortization	306
Finance Lease, Interest Expense	$ 46