Rate And Regulatory Matters (Correction Of Regulatory Asset For Income Taxes, Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Regulatory asset for income taxes - net	$ 754,870	$ 742,030
Accumulated deferred income taxes - current	22,103	13,109
Accumulated deferred income taxes and taxes accrued	8,339,892	8,311,756
Member's equity	9,368,517	9,291,089	9,123,996	9,055,270
Entergy Arkansas [Member]
Regulatory asset for income taxes - net	76,853	80,751
Accumulated deferred income taxes - current	3,529	5,927
Accumulated deferred income taxes and taxes accrued	1,881,613	1,829,281
Member's equity	1,616,381	1,579,616	1,500,316	1,444,124
Entergy Gulf States Louisiana [Member]
Regulatory asset for income taxes - net	170,837	171,051
Accumulated deferred income taxes - current	45,204	22,249
Accumulated deferred income taxes and taxes accrued	1,429,537	1,403,195
Member's equity	1,321,474	1,383,004	1,402,035	1,333,776
Entergy Louisiana [Member]
Regulatory asset for income taxes - net	201,691	193,114
Accumulated deferred income taxes - current	5,030	0
Accumulated deferred income taxes and taxes accrued	926,808	930,606
Member's equity	2,953,280	3,070,496	2,726,123	2,564,929
Entergy Mississippi [Member]
Regulatory asset for income taxes - net	62,246	63,614
Accumulated deferred income taxes - current	1,028	218
Accumulated deferred income taxes and taxes accrued	764,692	761,812
Member's equity	903,720	879,646	858,888	835,706
Entergy New Orleans
Accumulated deferred income taxes and taxes accrued	173,244	172,790
Member's equity	196,988	195,565	186,209	181,165
Entergy Texas [Member]
Regulatory asset for income taxes - net	130,371	131,287
Accumulated deferred income taxes and taxes accrued	962,613	1,009,081
Member's equity	866,021	854,146	872,303	899,355
System Energy [Member]
Regulatory asset for income taxes - net	122,866	126,503
Accumulated deferred income taxes - current	1,029	1,789
Accumulated deferred income taxes and taxes accrued	783,134	782,469
Member's equity	838,469	832,729	829,717	800,563
Member's Equity [Member] | Entergy Gulf States Louisiana [Member]
Member's equity	1,374,786	1,438,233	1,450,110	1,393,386
Member's Equity [Member] | Entergy Louisiana [Member]
Member's equity	$ 2,898,051	$ 3,016,628	$ 2,664,370	$ 2,504,436