Rate And Regulatory Matters Rough Production Cost Equalization Payments (Receipts) Among Utility Operating Companies (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($)
Entergy Arkansas [Member]
Rough production cost equalization payments	$ 3
Entergy Louisiana [Member]
Rough production cost equalization payments	3
Entergy Mississippi [Member]
Rough production cost equalization receipts	(1)
Entergy New Orleans [Member]
Rough production cost equalization payments	1
Entergy Texas [Member]
Rough production cost equalization receipts	$ (5)