Rate And Regulatory Matters (Correction Of Regulatory Asset For Income Taxes, Statement Of Changes In Equity) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Beginning Balance	$ 9,291,089	$ 9,055,270
Net income	166,982	(146,740)
Ending Balance	9,307,076	9,008,260
Entergy Arkansas [Member]
Beginning Balance	1,579,616	1,444,124
Net income	14,719	13,874
Ending Balance	1,577,617	1,456,280
Entergy Gulf States Louisiana [Member]
Beginning Balance	1,383,004	1,333,776
Net income	27,165	28,358
Ending Balance	1,291,008	1,341,351
Entergy Gulf States Louisiana [Member] | Member's Equity [Member]
Beginning Balance	1,438,233	1,393,386
Net income	27,165	28,358
Ending Balance	1,345,282	1,399,933
Entergy Louisiana [Member]
Beginning Balance	3,070,496	2,564,929
Net income	45,376	33,295
Ending Balance	3,074,211	2,596,539
Entergy Louisiana [Member] | Member's Equity [Member]
Beginning Balance	3,016,628	2,504,436
Net income	45,376	33,295
Ending Balance	3,019,665	2,535,393
Entergy Mississippi [Member]
Beginning Balance	879,646	835,706
Net income	13,934	8,682
Ending Balance	885,473	843,681
Entergy New Orleans
Beginning Balance	195,565	181,165
Net income	1,307	40
Ending Balance	196,631	179,264
Entergy Texas [Member]
Beginning Balance	854,146	899,355
Net income	922	1,745
Ending Balance	855,068	901,100
System Energy [Member]
Beginning Balance	832,729	800,563
Net income	28,006	26,536
Ending Balance	$ 810,735	$ 798,349