Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Credit Facilities) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Line of credit facility, maximum borrowing capacity	$ 3,500,000
Amount Drawn/ Outstanding	210,000
Issuance of letters of credit, limit of total borrowing capacity	20,000
Entergy Arkansas [Member]
Letters of Credit Outstanding, Amount	200	$ 300
Issuance of letters of credit, limit of total borrowing capacity	$ 5,000
Entergy Arkansas [Member] | Credit Facility Of One Hundred And Fifty Million [Member]
Expiration Date	Aug. 14, 2022
Line of credit facility, maximum borrowing capacity	$ 150,000
Interest Rate	2.82%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	$ 0
Entergy Arkansas [Member] | Credit Facility Of Twenty Million [Member]
Expiration Date	Apr. 30, 2018
Line of credit facility, maximum borrowing capacity	$ 20,000
Interest Rate	2.82%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	0
Entergy Louisiana [Member]
Issuance of letters of credit, limit of total borrowing capacity	$ 15,000
Entergy Louisiana [Member] | Credit Facility Of Three Hundred and Fifty Million [Member]
Expiration Date	Aug. 14, 2022
Line of credit facility, maximum borrowing capacity	$ 350,000
Interest Rate	2.82%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	9,100
Entergy Mississippi [Member]
Letters of Credit Outstanding, Amount	$ 100	$ 100
Entergy Mississippi [Member] | Credit Facility Of Thirty Five Million [Member]
Expiration Date	May 31, 2018
Line of credit facility, maximum borrowing capacity	$ 35,000
Interest Rate	3.07%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	$ 0
Entergy Mississippi [Member] | Credit Facility Of Twenty Million [Member]
Expiration Date	May 31, 2018
Line of credit facility, maximum borrowing capacity	$ 20,000
Interest Rate	3.07%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	$ 0
Entergy Mississippi [Member] | Credit Facility Of Ten Million [Member]
Expiration Date	May 31, 2018
Line of credit facility, maximum borrowing capacity	$ 10,000
Interest Rate	3.07%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	$ 0
Entergy Mississippi [Member] | Credit Facility Of Thirty Seven Point Five Million [Member]
Expiration Date	May 31, 2018
Line of credit facility, maximum borrowing capacity	$ 37,500
Interest Rate	3.07%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	0
Entergy Texas [Member]
Issuance of letters of credit, limit of total borrowing capacity	$ 30,000
Entergy Texas [Member] | Credit Facility Of One Hundred And Fifty Million [Member]
Expiration Date	Aug. 30, 2022
Line of credit facility, maximum borrowing capacity	$ 150,000
Interest Rate	3.07%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	25,600
Entergy New Orleans [Member]
Issuance of letters of credit, limit of total borrowing capacity	$ 10,000
Entergy New Orleans [Member] | Credit Facility Of Twenty Five Million [Member]
Expiration Date	Nov. 20, 2018
Line of credit facility, maximum borrowing capacity	$ 25,000
Interest Rate	3.04%
Amount Drawn/ Outstanding	$ 0
Letters of Credit Outstanding, Amount	$ 800