Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Issuance Of Commercial Paper To Finance Acquisition And Ownership Of Nuclear Fuel) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2019
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Amount Drawn/ Outstanding		$ 440.0
Entergy Arkansas VIE [Member]
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Line of Credit Facility, Expiration Date	Sep. 16, 2021
Amount of Facility		$ 80.0
Weighted Average Interest Rate on Borrowings		3.33%
Amount Drawn/ Outstanding		$ 15.1
System Energy VIE [Member]
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Line of Credit Facility, Expiration Date	Sep. 16, 2021
Amount of Facility		$ 120.0
Weighted Average Interest Rate on Borrowings		3.34%
Amount Drawn/ Outstanding		$ 31.6
Entergy Louisiana Waterford VIE [Member]
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Line of Credit Facility, Expiration Date	Sep. 16, 2021
Amount of Facility		$ 105.0
Weighted Average Interest Rate on Borrowings		3.30%
Amount Drawn/ Outstanding		$ 49.9
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	Sep. 16, 2021
Amount of Facility		$ 105.0
Weighted Average Interest Rate on Borrowings		3.23%
Amount Drawn/ Outstanding		$ 70.3