Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Credit Facilities) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Amount of Facility	$ 3,500
Amount Drawn/ Outstanding	570.0
Entergy Arkansas [Member] | Credit Facility Of Twenty Million [Member]
Expiration Date	Apr. 01, 2013
Amount of Facility	20
Interest Rate	1.78%
Entergy Arkansas [Member] | Credit Facility Of One Hundred And Fifty Million [Member]
Expiration Date	Mar. 01, 2018
Amount of Facility	150
Interest Rate	1.70%
Entergy Gulf States Louisiana [Member] | Credit Facility Of One Hundred And Fifty Million [Member]
Expiration Date	Mar. 01, 2018
Amount of Facility	150
Interest Rate	1.70%
Amount Drawn/ Outstanding	50.0
Entergy Louisiana [Member] | Credit Facility Of Two Hundred Million [Member]
Expiration Date	Mar. 01, 2018
Amount of Facility	200
Interest Rate	1.70%
Entergy Mississippi [Member] | Credit Facility Of Thirty Five Million [Member]
Expiration Date	May 01, 2013
Amount of Facility	35
Interest Rate	1.95%
Amount Drawn/ Outstanding	35.0
Entergy Mississippi [Member] | Credit Facility Of Twenty Five Million [Member]
Expiration Date	May 01, 2013
Amount of Facility	25
Interest Rate	1.95%
Amount Drawn/ Outstanding	25.0
Entergy Mississippi [Member] | Credit Facility Of Ten Million [Member]
Expiration Date	May 01, 2013
Amount of Facility	10
Interest Rate	1.95%
Amount Drawn/ Outstanding	10.0
Entergy New Orleans | Credit Facility Of Twenty Five Million [Member]
Expiration Date	Nov. 01, 2013
Amount of Facility	25
Interest Rate	1.68%
Amount Drawn/ Outstanding	25.0
Entergy Texas [Member] | Credit Facility Of One Hundred And Fifty Million [Member]
Expiration Date	Mar. 01, 2018
Amount of Facility	$ 150
Interest Rate	1.95%
Maximum [Member] | Entergy Arkansas [Member]
Debt ratio	65.00%