Rate And Regulatory Matters (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended		9 Months Ended	1 Months Ended																		2 Months Ended
	Jun. 30, 2012	Feb. 29, 2012	Sep. 30, 2012	Sep. 30, 2012 Entergy Louisiana [Member]	Aug. 31, 2012 Entergy Louisiana [Member]	Jun. 30, 2012 Entergy Louisiana [Member]	May 31, 2012 Entergy Louisiana [Member]	Mar. 31, 2012 Entergy Mississippi [Member]	Sep. 30, 2012 Entergy Gulf States Louisiana [Member]	Aug. 31, 2012 Entergy Gulf States Louisiana [Member]	May 31, 2012 Entergy Gulf States Louisiana [Member]	Apr. 30, 2012 Entergy Gulf States Louisiana [Member]	Feb. 29, 2012 Entergy Gulf States Louisiana [Member]	Jan. 31, 2012 Entergy Gulf States Louisiana [Member]	May 31, 2012 Entergy New Orleans	Oct. 31, 2012 Entergy Texas [Member]	Sep. 30, 2012 Entergy Texas [Member]	Jul. 31, 2012 Entergy Texas [Member]	Apr. 30, 2012 Entergy Texas [Member]	Dec. 31, 2011 Entergy Texas [Member]	Nov. 30, 2011 Entergy Texas [Member]	May 31, 2012 Entergy Texas [Member]
Rate and Regulatory Matters [Abstract]
Public Utilities Recommended Midpoint Return On Common Equity										9.30%
Construction Work In Progress - Hurricane Isaac			$ 270.0
Regulatory Asset - Hurricane Isaac			130.0
Adjustment To Income Tax Expense			46.3
Adjustment To Regulatory Asset For Income Taxes			75.3
Adjustment To Accumulated Deferred Income Taxes			29
Request filed for refund of fuel cost recovery over collections																				43
Refund for fuel cost recovery																78				67
Public Utilities Earned Return On Common Equity					10.38%		9.63%	10.92%		11.86%	11.94%	11.54%		10.48%				9.80%	9.60%		10.60%
Basis Point Bandwidth														10.50%
Rate reduction												0.1
Rate Increase																		28
Rough Production Cost Equalization Refund	30.6
Cost of Service Rate Change										5.7	6.5
Rate Decrease for Incremental Capacity Costs										20.3	22.9
Rate Increase for Incremental Capacity Costs					15.9		18.1
Electric Base Revenue Increase															4.9
Increase In Base Rate Reflecting Return On Common Equity																					112
Gas Base Revenue Increase															0.05
Increase in Annual Funding for Storm Reserve															5.7
Recommended Increase in Rate Base																			66
Revised Increase In Rate Base Request																			105
Revised Base Rate Increase																						27
Amount Collected From Customers		156
Proceeds From Sale of Preferred Membership Units													51
Charges Above Prevailing Market Prices			57
Low Damages Range In Texas Lawsuit			153
Class A preferred membership units sold to third party													500,000
High Damages Range in Texas Lawsuit			972
Credit to customers resulting from a FERC order																		37.5
Increase in revenues as a result of rate change				1.3					2.2
Estimated revenue requirement assoicated with Waterford 3 replacement steam generator project						101
MISO transition expenses in base rates per PUCT																	1.6
Reduction of fuel reconciliation recovery due to disagreement with line loss factor in calculation per PUCT																	4
Regulatory charge recorded due to probability of non-recovery per PUCT order																	24
Potential cost for Entergy Arkansas for years 2003, 2004, and 2006 based on intra-system bills			12
Per LPSC, the amount of harm that intra-system sales caused for period 2000-2009			$ 144