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Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Credit Facilities) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Amount of Facility $ 3,500.0
Amount Drawn/ Outstanding 150.0
Entergy Arkansas [Member] | Credit Facility Of Twenty Million [Member]
 
Expiration Date Apr. 01, 2014
Amount of Facility 20.0
Interest Rate 1.75%
Entergy Arkansas [Member] | Credit Facility Of One Hundred And Fifty Million [Member]
 
Expiration Date Mar. 01, 2018
Amount of Facility 150.0
Interest Rate 1.68%
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 1.68%
Entergy Louisiana [Member] | Credit Facility Of Two Hundred Million [Member]
 
Expiration Date Mar. 01, 2018
Amount of Facility 200.0
Interest Rate 1.68%
Entergy Mississippi [Member] | Credit Facility Of Thirty Seven Point Five Million [Member]
 
Expiration Date May 01, 2014
Amount of Facility 37.5
Interest Rate 1.93%
Entergy Mississippi [Member] | Credit Facility Of Thirty Five Million [Member]
 
Expiration Date May 01, 2014
Amount of Facility 35.0
Interest Rate 1.93%
Entergy Mississippi [Member] | Credit Facility Of Twenty Million [Member]
 
Expiration Date May 01, 2014
Amount of Facility 20.0
Interest Rate 1.93%
Entergy New Orleans | Credit Facility Of Twenty Five Million [Member]
 
Expiration Date Nov. 01, 2013
Amount of Facility 25.0
Interest Rate 1.65%
Entergy Texas [Member] | Credit Facility Of One Hundred And Fifty Million [Member]
 
Expiration Date Mar. 01, 2018
Amount of Facility $ 150.0
Interest Rate 1.93%
Maximum [Member] | Entergy Arkansas [Member]
 
Debt ratio 65.00%
Maximum [Member] | Entergy New Orleans
 
Debt ratio 65.00%