Rate And Regulatory Matters (Correction Of Regulatory Asset For Income Taxes, Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Regulatory asset for income taxes - net	$ 860,169	$ 742,030
Accumulated deferred income taxes - current	35,095	13,109
Accumulated deferred income taxes and taxes accrued	8,330,667	8,311,756
Member's equity	9,502,451	9,291,089	9,284,522	9,055,270
Entergy Arkansas [Member]
Regulatory asset for income taxes - net	75,286	80,751
Accumulated deferred income taxes - current	9,794	5,927
Accumulated deferred income taxes and taxes accrued	1,859,020	1,829,281
Member's equity	1,697,240	1,579,616	1,581,149	1,444,124
Entergy Gulf States Louisiana [Member]
Regulatory asset for income taxes - net	171,006	171,051
Accumulated deferred income taxes - current	48,902	22,249
Accumulated deferred income taxes and taxes accrued	1,463,685	1,403,195
Member's equity	1,384,909	1,383,004	1,407,998	1,333,776
Entergy Louisiana [Member]
Regulatory asset for income taxes - net	310,672	193,114
Accumulated deferred income taxes - current	3,865	0
Accumulated deferred income taxes and taxes accrued	1,112,480	930,606
Member's equity	2,902,823	3,070,496	2,805,223	2,564,929
Entergy Mississippi [Member]
Regulatory asset for income taxes - net	61,238	63,614
Accumulated deferred income taxes - current	3,333	218
Accumulated deferred income taxes and taxes accrued	754,316	761,812
Member's equity	936,826	879,646	885,261	835,706
Entergy New Orleans
Accumulated deferred income taxes and taxes accrued	172,340	172,790
Member's equity	204,831	195,565	196,522	181,165
Entergy Texas [Member]
Regulatory asset for income taxes - net	129,645	131,287
Accumulated deferred income taxes - current	31,816	0
Accumulated deferred income taxes and taxes accrued	1,021,401	1,009,081
Member's equity	876,822	854,146	879,117	899,355
System Energy [Member]
Regulatory asset for income taxes - net	120,739	126,503
Accumulated deferred income taxes - current	688	1,789
Accumulated deferred income taxes and taxes accrued	783,720	782,469
Member's equity	873,574	832,729	860,333	800,563
Member's Equity [Member] | Entergy Gulf States Louisiana [Member]
Member's equity	1,437,258	1,438,233	1,455,211	1,393,386
Member's Equity [Member] | Entergy Louisiana [Member]
Member's equity	$ 2,846,910	$ 3,016,628	$ 2,742,840	$ 2,504,436