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, 2020 USD ($)
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Amount Drawn/ Outstanding	$ 165.0
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, 2022
Amount of Facility	$ 80.0
Weighted Average Interest Rate on Borrowings	1.94%
Amount Drawn/ Outstanding	$ 12.2
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, 2022
Amount of Facility	$ 120.0
Weighted Average Interest Rate on Borrowings	1.63%
Amount Drawn/ Outstanding	$ 0.0
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, 2022
Amount of Facility	$ 105.0
Weighted Average Interest Rate on Borrowings	1.72%
Amount Drawn/ Outstanding	$ 39.3
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, 2022
Amount of Facility	$ 105.0
Weighted Average Interest Rate on Borrowings	1.95%
Amount Drawn/ Outstanding	$ 18.9