Rate And Regulatory Matters (Correction Of Regulatory Asset For Income Taxes, Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Regulatory asset for income taxes - net	$ 730,526	$ 799,006
Accumulated deferred income taxes - current	73,690	99,929
Accumulated deferred income taxes and taxes accrued	8,173,216	8,096,452
Member's equity	9,284,522	9,055,270	9,059,362	8,590,400
Entergy Arkansas [Member]
Regulatory asset for income taxes - net	77,768	87,357
Accumulated deferred income taxes - current	40,571	124,267
Accumulated deferred income taxes and taxes accrued	1,886,459	1,708,760
Member's equity	1,581,149	1,444,124	1,438,502	1,403,906
Entergy Gulf States Louisiana [Member]
Regulatory asset for income taxes - net	172,995	173,724
Accumulated deferred income taxes - current	20,634	5,107
Accumulated deferred income taxes and taxes accrued	1,371,292	1,368,563
Member's equity	1,407,998	1,333,776	1,333,613	1,464,289
Entergy Louisiana [Member]
Regulatory asset for income taxes - net	184,770	175,952
Accumulated deferred income taxes - current	13,879	4,690
Accumulated deferred income taxes and taxes accrued	1,011,483	1,098,690
Member's equity	2,805,223	2,564,929	2,888,880	2,136,871
Entergy Mississippi [Member]
Regulatory asset for income taxes - net	63,833	65,196
Accumulated deferred income taxes and taxes accrued	709,322	672,129
Member's equity	885,261	835,706	801,996	733,105
Entergy New Orleans
Accumulated deferred income taxes and taxes accrued	162,687	144,405
Member's equity	196,522	181,165	195,707	188,154
Entergy Texas [Member]
Regulatory asset for income taxes - net	128,118	129,924
Accumulated deferred income taxes and taxes accrued	932,592	934,990
Member's equity	879,117	899,355	898,208	824,290
System Energy [Member]
Regulatory asset for income taxes - net	129,945	124,777
Accumulated deferred income taxes - current	16,082	3,428
Accumulated deferred income taxes and taxes accrued	762,227	652,418
Member's equity	860,333	800,563	805,951	812,366
As Previously Reported [Member] | Entergy Gulf States Louisiana [Member]
Regulatory asset for income taxes - net		249,058
Accumulated deferred income taxes - current		5,427
Accumulated deferred income taxes and taxes accrued		1,397,230
Member's equity			1,375,268	1,509,213
As Corrected [Member] | Entergy Gulf States Louisiana [Member]
Regulatory asset for income taxes - net		173,724
Accumulated deferred income taxes - current		5,107
Accumulated deferred income taxes and taxes accrued		1,368,563
Member's equity			1,333,613	1,464,289
Member's Equity [Member] | Entergy Gulf States Louisiana [Member]
Member's equity	1,455,211	1,393,386	1,362,202	1,494,593
Member's Equity [Member] | Entergy Louisiana [Member]
Member's equity	2,742,840	2,504,436	2,812,375	2,061,833
Member's Equity [Member] | As Previously Reported [Member] | Entergy Gulf States Louisiana [Member]
Member's equity		1,439,733	1,403,857	1,539,517
Member's Equity [Member] | As Corrected [Member] | Entergy Gulf States Louisiana [Member]
Member's equity		$ 1,393,386	$ 1,362,202	$ 1,494,593