Revolving Credit Facilities, Lines Of Credit, Short-Term Borrowings, And Long-Term Debt (Credit Facilities) (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Amount of total borrowing capacity against which fronting commitments exist	$ 20,000
Amount of Facility	3,500,000
Amount Drawn/ Outstanding	630,000
Entergy Arkansas [Member]
Amount of total borrowing capacity against which fronting commitments exist	5,000
Letters of Credit Outstanding, Amount	$ 1,000		$ 200
Entergy Arkansas [Member] | Credit Facility Of One Hundred And Fifty Million [Member]
Expiration Date	Sep. 14, 2023
Amount of Facility	$ 150,000
Interest Rate	3.49%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	$ 0
Entergy Arkansas [Member] | Credit Facility Of Twenty Million [Member]
Expiration Date	Apr. 30, 2019
Amount of Facility	$ 20,000
Interest Rate	3.49%
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 Fifty Million [Member]
Expiration Date	Sep. 14, 2023
Amount of Facility	$ 350,000	$ 350,000
Interest Rate	3.49%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	0
Entergy Mississippi [Member]
Letters of Credit Outstanding, Amount	$ 200		100
Entergy Mississippi [Member] | Credit Facility Of Thirty Seven Point Five Million [Member]
Expiration Date	May 31, 2019
Amount of Facility	$ 37,500
Interest Rate	3.74%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	$ 0
Entergy Mississippi [Member] | Credit Facility Of Thirty Five Million [Member]
Expiration Date	May 31, 2019
Amount of Facility	$ 35,000
Interest Rate	3.74%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	$ 0
Entergy Mississippi [Member] | Credit Facility Of Ten Million [Member]
Expiration Date	May 31, 2019
Amount of Facility	$ 10,000
Interest Rate	3.74%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	0
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, 2018
Amount of Facility	$ 25,000
Interest Rate	3.72%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	800
Entergy Texas [Member]
Amount of total borrowing capacity against which fronting commitments exist	30,000
Letters of Credit Outstanding, Amount	$ 3,600		$ 50
Entergy Texas [Member] | Credit Facility Of One Hundred And Fifty Million [Member]
Expiration Date	Sep. 14, 2023
Amount of Facility	$ 150,000
Interest Rate	3.74%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	$ 1,300