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, 2021 USD ($)
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Amount Drawn/ Outstanding	$ 325.0
Entergy Arkansas VIE [Member]
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Amount of Facility	$ 80.0
Line of Credit Facility, Interest Rate During Period	1.20%
Amount Drawn/ Outstanding	$ 5.3
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
Amount of Facility	$ 120.0
Line of Credit Facility, Interest Rate During Period	1.18%
Amount Drawn/ Outstanding	$ 40.7
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
Amount of Facility	$ 105.0
Line of Credit Facility, Interest Rate During Period	1.17%
Amount Drawn/ Outstanding	$ 53.2
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
Amount of Facility	$ 105.0
Line of Credit Facility, Interest Rate During Period	1.18%
Amount Drawn/ Outstanding	$ 49.3
Line of credit facility commitment fee as a percentage of undrawn commitment amount	0.10%