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	6 Months Ended
	Jun. 30, 2018 USD ($)
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Amount Drawn/ Outstanding	$ 390.0
Entergy Arkansas VIE [Member]
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Expiration Date	May 16, 2019
Amount of Facility	$ 80.0
Weighted Average Interest Rate on Borrowings	3.08%
Amount Drawn/ Outstanding	$ 41.7
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	May 16, 2019
Amount of Facility	$ 120.0
Weighted Average Interest Rate on Borrowings	3.79%
Amount Drawn/ Outstanding	$ 38.9
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	May 16, 2019
Amount of Facility	$ 105.0
Weighted Average Interest Rate on Borrowings	3.09%
Amount Drawn/ Outstanding	$ 44.8
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	May 16, 2019
Amount of Facility	$ 85.0
Weighted Average Interest Rate on Borrowings	3.07%
Amount Drawn/ Outstanding	$ 45.4
Line of credit facility commitment fee as a percentage of undrawn commitment amount	0.10%