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Revolving Credit Facilities, Lines Of Credit And Short-Term Borrowings (Short-Term Borrowings And The Outstanding Short-Term Borrowings) (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Entergy Arkansas [Member]
 
Short-term borrowings and the outstanding short-term borrowings  
Authorized $ 250
Entergy Gulf States Louisiana [Member]
 
Short-term borrowings and the outstanding short-term borrowings  
Authorized 200
Borrowings 36
Entergy Louisiana [Member]
 
Short-term borrowings and the outstanding short-term borrowings  
Authorized 250
Entergy Mississippi [Member]
 
Short-term borrowings and the outstanding short-term borrowings  
Authorized 175
Borrowings 70
Entergy New Orleans
 
Short-term borrowings and the outstanding short-term borrowings  
Authorized 100
Entergy Texas [Member]
 
Short-term borrowings and the outstanding short-term borrowings  
Authorized 200
System Energy [Member]
 
Short-term borrowings and the outstanding short-term borrowings  
Authorized 200
Borrowings $ 51