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	3 Months Ended
	Mar. 31, 2018 USD ($)
Issuance of commercial paper to finance the acquisition and ownership of nuclear fuel
Amount Drawn/ Outstanding	$ 1,125.0
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	3.74%
Amount Drawn/ Outstanding	$ 43.9
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	3.46%
Amount Drawn/ Outstanding	$ 43.2
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	2.82%
Amount Drawn/ Outstanding	$ 52.3
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	3.35%
Amount Drawn/ Outstanding	$ 62.9
Line of credit facility commitment fee as a percentage of undrawn commitment amount	0.10%