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