Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Credit Facilities) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013
Amount of Facility	$ 3,500.0
Amount Drawn/ Outstanding	190.0
Entergy Arkansas [Member] | Credit Facility Of Twenty Million [Member]
Expiration Date	Apr. 01, 2014
Amount of Facility	20.0
Interest Rate	1.78%
Entergy Arkansas [Member] | Credit Facility Of One Hundred And Fifty Million [Member]
Expiration Date	Mar. 01, 2018
Amount of Facility	150.0
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	150.0
Interest Rate	1.70%
Amount Drawn/ Outstanding	100.0
Entergy Louisiana [Member] | Credit Facility Of Two Hundred Million [Member]
Expiration Date	Mar. 01, 2018
Amount of Facility	200.0
Interest Rate	1.70%
Amount Drawn/ Outstanding	100.0
Entergy Mississippi [Member] | Credit Facility Of Thirty Seven Point Five Million [Member]
Expiration Date	May 01, 2014
Amount of Facility	37.5
Interest Rate	3.25%
Amount Drawn/ Outstanding	28.4
Entergy Mississippi [Member] | Credit Facility Of Thirty Five Million [Member]
Expiration Date	May 01, 2014
Amount of Facility	35.0
Interest Rate	3.25%
Amount Drawn/ Outstanding	26.5
Entergy Mississippi [Member] | Credit Facility Of Twenty Million [Member]
Expiration Date	May 01, 2014
Amount of Facility	20.0
Interest Rate	3.25%
Amount Drawn/ Outstanding	15.1
Entergy New Orleans | Credit Facility Of Twenty Five Million [Member]
Expiration Date	Nov. 01, 2013
Amount of Facility	25.0
Interest Rate	1.67%
Entergy Texas [Member] | Credit Facility Of One Hundred And Fifty Million [Member]
Expiration Date	Mar. 01, 2018
Amount of Facility	$ 150.0
Interest Rate	1.95%
Maximum [Member] | Entergy Arkansas [Member]
Debt ratio	65.00%
Maximum [Member] | Entergy New Orleans
Debt ratio	65.00%