Revolving Credit Facilities, Lines Of Credit, Short-Term Borrowings, And Long-Term Debt (Issuance Of Commercial Paper To Finance Acquisition And Ownership Of Nuclear Fuel) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($)
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Amount Drawn/ Outstanding	$ 630.0
Entergy Arkansas VIE [Member]
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Expiration Date	Sep. 16, 2021
Amount of Facility	$ 80.0
Line of Credit Facility, Interest Rate During Period	3.18%
Amount Drawn/ Outstanding	$ 70.4
Line of credit facility commitment fee as a percentage of undrawn commitment amount	0.10%
System Energy VIE [Member]
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Expiration Date	Sep. 16, 2021
Amount of Facility	$ 120.0
Line of Credit Facility, Interest Rate During Period	3.18%
Amount Drawn/ Outstanding	$ 37.7
Line of credit facility commitment fee as a percentage of undrawn commitment amount	0.10%
Entergy Louisiana River Bend VIE [Member]
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Expiration Date	Sep. 16, 2021
Amount of Facility	$ 105.0
Line of Credit Facility, Interest Rate During Period	3.18%
Amount Drawn/ Outstanding	$ 34.5
Line of credit facility commitment fee as a percentage of undrawn commitment amount	0.10%
Entergy Louisiana Waterford VIE [Member]
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Expiration Date	Sep. 16, 2021
Amount of Facility	$ 105.0
Line of Credit Facility, Interest Rate During Period	3.18%
Amount Drawn/ Outstanding	$ 30.5
Line of credit facility commitment fee as a percentage of undrawn commitment amount	0.10%