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Rate And Regulatory Matters (Estimated Hurricane Isaac Total Restoration Costs For Repair And Or Replacement Of Electric Facilities) (Details) (USD $)
In Millions, unless otherwise specified
1 Months Ended
Aug. 31, 2012
Estimated Hurricane Isaac Total Restoration Costs $ 370
Entergy Arkansas [Member]
 
Estimated Hurricane Isaac Total Restoration Costs 7
Entergy Gulf States Louisiana [Member]
 
Estimated Hurricane Isaac Total Restoration Costs 70
Entergy Louisiana [Member]
 
Estimated Hurricane Isaac Total Restoration Costs 220
Entergy Mississippi [Member]
 
Estimated Hurricane Isaac Total Restoration Costs 22
Entergy New Orleans [Member]
 
Estimated Hurricane Isaac Total Restoration Costs $ 48