Rate And Regulatory Matters (Correction Of Regulatory Asset For Income Taxes, Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Regulatory asset for income taxes - net	$ 742,030	$ 799,006
Accumulated deferred income taxes - current	13,109	99,929
Accumulated deferred income taxes and taxes accrued	8,311,756	8,096,452
Member's equity	9,291,089	9,055,270	8,590,400	8,707,360
Entergy Arkansas [Member]
Regulatory asset for income taxes - net	80,751	87,357
Accumulated deferred income taxes - current	5,927	124,267
Accumulated deferred income taxes and taxes accrued	1,829,281	1,708,760
Member's equity	1,579,616	1,444,124	1,403,906	1,411,561
Entergy Gulf States Louisiana [Member]
Regulatory asset for income taxes - net	171,051	173,724
Accumulated deferred income taxes - current	22,249	5,107
Accumulated deferred income taxes and taxes accrued	1,403,195	1,368,563
Member's equity	1,383,004	1,333,776	1,464,289	1,413,254
Entergy Louisiana [Member]
Regulatory asset for income taxes - net	193,114	175,952
Accumulated deferred income taxes - current	0	4,690
Accumulated deferred income taxes and taxes accrued	930,606	1,098,690
Member's equity	3,070,496	2,564,929	2,136,871	1,911,809
Entergy Mississippi [Member]
Regulatory asset for income taxes - net	63,614	65,196
Accumulated deferred income taxes - current	218	0
Accumulated deferred income taxes and taxes accrued	761,812	672,129
Member's equity	879,646	835,706	733,105	693,956
Entergy New Orleans [Member]
Accumulated deferred income taxes and taxes accrued	172,790	144,405
Member's equity	195,565	181,165	188,154	205,005
Entergy Texas [Member]
Regulatory asset for income taxes - net	131,287	129,924
Accumulated deferred income taxes and taxes accrued	1,009,081	934,990
Member's equity	854,146	899,355	824,290	844,490
System Energy [Member]
Regulatory asset for income taxes - net	126,503	124,777
Accumulated deferred income taxes - current	1,789	3,428
Accumulated deferred income taxes and taxes accrued	782,469	652,418
Member's equity	832,729	800,563	812,366	829,942
As Previously Reported [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
As Previously Reported [Member] | Entergy Gulf States Louisiana [Member]
Member's equity		1,380,123	1,509,213	1,441,759
As Corrected [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
As Corrected [Member] | Entergy Gulf States Louisiana [Member]
Member's equity		1,333,776	1,464,289	1,413,254
Member's Equity [Member] | Entergy Gulf States Louisiana [Member]
Member's equity	1,438,233	1,393,386	1,494,593	1,445,425
Member's Equity [Member] | Entergy Louisiana [Member]
Member's equity	3,016,628	2,504,436	2,061,833	1,837,348
Member's Equity [Member] | As Previously Reported [Member]
Member's equity		1,439,733
Member's Equity [Member] | As Previously Reported [Member] | Entergy Gulf States Louisiana [Member]
Member's equity		1,439,733	1,539,517	1,473,930
Member's Equity [Member] | As Corrected [Member]
Member's equity		1,393,386
Member's Equity [Member] | As Corrected [Member] | Entergy Gulf States Louisiana [Member]
Member's equity		$ 1,393,386	$ 1,494,593	$ 1,445,425