Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Credit Facilities) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Line of credit facility, maximum borrowing capacity	$ 3,500,000
Amount Drawn/ Outstanding	165,000
Amount of total borrowing capacity against which fronting commitments exist	20,000
Entergy Arkansas [Member]
Amount of total borrowing capacity against which fronting commitments exist	$ 5,000
Entergy Arkansas [Member] | Credit Facility Of One Hundred And Fifty Million [Member]
Expiration Date	Sep. 14, 2024
Line of credit facility, maximum borrowing capacity	$ 150,000
Interest Rate	1.27%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	$ 0
Entergy Arkansas [Member] | Credit Facility Of Twenty Five Million [Member]
Expiration Date	Apr. 30, 2021
Line of credit facility, maximum borrowing capacity	$ 25,000
Interest Rate	1.27%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	0
Entergy Louisiana [Member]
Amount of total borrowing capacity against which fronting commitments exist	15,000
Entergy Louisiana [Member] | Credit Facility Of Three Hundred and Fifty Million [Member]
Line of credit facility, maximum borrowing capacity	$ 350,000
Interest Rate	1.27%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	$ 0
Entergy Mississippi [Member] | Credit Facility Of Thirty Five Million [Member]
Expiration Date	Apr. 30, 2021
Line of credit facility, maximum borrowing capacity	$ 35,000
Interest Rate	1.65%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	$ 0
Entergy Mississippi [Member] | Credit Facility Of Ten Million [Member]
Expiration Date	Apr. 30, 2021
Line of credit facility, maximum borrowing capacity	$ 10,000
Interest Rate	1.65%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	$ 0
Entergy Mississippi [Member] | Credit Facility Of Thirty Seven Point Five Million [Member]
Expiration Date	Apr. 30, 2021
Line of credit facility, maximum borrowing capacity	$ 37,500
Interest Rate	1.65%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	0
Entergy Texas [Member]
Amount of total borrowing capacity against which fronting commitments exist	$ 30,000
Entergy Texas [Member] | Credit Facility Of One Hundred And Fifty Million [Member]
Expiration Date	Sep. 14, 2024
Line of credit facility, maximum borrowing capacity	$ 150,000
Interest Rate	1.65%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	1,300
Entergy New Orleans [Member]
Amount of total borrowing capacity against which fronting commitments exist	$ 10,000
Entergy New Orleans [Member] | Credit Facility Of Twenty Five Million [Member]
Expiration Date	Nov. 20, 2021
Line of credit facility, maximum borrowing capacity	$ 25,000
Interest Rate	1.42%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	$ 800