Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Issuance Of Commercial Paper To Finance Acquisition And Ownership Of Nuclear Fuel) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($)
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Amount Drawn/ Outstanding	$ 210.0
Entergy Arkansas VIE [Member]
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Line of Credit Facility, Expiration Date	May 16, 2019
Amount of Facility	$ 80.0
Weighted Average Interest Rate on Borrowings	2.87%
Amount Drawn/ Outstanding	$ 74.9
System Energy VIE [Member]
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Line of Credit Facility, Expiration Date	May 16, 2019
Amount of Facility	$ 120.0
Weighted Average Interest Rate on Borrowings	2.52%
Amount Drawn/ Outstanding	$ 67.8
Entergy Louisiana Waterford VIE [Member]
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Line of Credit Facility, Expiration Date	May 16, 2019
Amount of Facility	$ 85.0
Weighted Average Interest Rate on Borrowings	2.64%
Amount Drawn/ Outstanding	$ 79.9
Entergy Louisiana River Bend VIE [Member]
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Line of Credit Facility, Expiration Date	May 16, 2019
Amount of Facility	$ 105.0
Weighted Average Interest Rate on Borrowings	2.38%
Amount Drawn/ Outstanding	$ 65.7