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Quarterly Financial Data (Tables)
12 Months Ended
Dec. 31, 2012
Schedule of Quarterly Financial Data
Entergy Arkansas [Member]
 
Schedule of Quarterly Financial Data
Entergy Gulf States Louisiana [Member]
 
Schedule of Quarterly Financial Data
Entergy Louisiana [Member]
 
Schedule of Quarterly Financial Data
Entergy Mississippi [Member]
 
Schedule of Quarterly Financial Data
Entergy New Orleans [Member]
 
Schedule of Quarterly Financial Data
Entergy Texas [Member]
 
Schedule of Quarterly Financial Data
System Energy [Member]
 
Schedule of Quarterly Financial Data