Rate And Regulatory Matters (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended			6 Months Ended	1 Months Ended										2 Months Ended
	Jun. 30, 2012	Feb. 29, 2012	Dec. 31, 2011	Jun. 30, 2012	May 31, 2012 Entergy Louisiana [Member]	Mar. 31, 2012 Entergy Mississippi [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	Jul. 31, 2012 Entergy Texas [Member]	Apr. 30, 2012 Entergy Texas [Member]	Nov. 30, 2011 Entergy Texas [Member]	May 31, 2012 Entergy Texas [Member]
Rate and Regulatory Matters [Abstract]
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			67
Public Utilities Earned Return On Common Equity					9.63%	10.92%	11.94%	11.54%		10.48%		9.80%	9.60%	10.60%
Basis Point Bandwidth										10.50%
Rate reduction								0.1
Rate Increase												16
Rate Increase supported by PUCT Staff												28.3
Rough Production Cost Equalization Refund	30.6
Cost of Service Rate Change							6.5
Rate Decrease for Incremental Capacity Costs							22.9
Rate Increase for Incremental Capacity Costs					18.1
Electric Base Revenue Increase											3
Increase In Base Rate Reflecting Return On Common Equity														112
Gas Base Revenue Increase											1
Amortization of MISO Transition Expenses												2.4
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