Rate And Regulatory Matters (Narrative) (Details) (USD $)	0 Months Ended	1 Months Ended							12 Months Ended					20 Months Ended	1 Months Ended													9 Months Ended	1 Months Ended																		3 Months Ended			4 Months Ended		12 Months Ended	1 Months Ended			3 Months Ended		12 Months Ended	1 Months Ended			12 Months Ended	1 Months Ended
	Oct. 16, 2013 order	Jan. 31, 2013	Dec. 31, 2012	Jul. 31, 2012	Jun. 30, 2012	May 31, 2012	Oct. 31, 2011 issue	Apr. 30, 2008	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	May 02, 2003	Dec. 31, 2014		Aug. 31, 2014	Jul. 31, 2014	Jun. 30, 2014	May 31, 2014	Jan. 31, 2014	Apr. 30, 2013	Mar. 31, 2013	Feb. 28, 2013	Aug. 31, 2012	Nov. 30, 2011	Apr. 30, 2007	Sep. 30, 2014	Jul. 31, 2008	Jul. 31, 2010	Dec. 31, 2009	Oct. 31, 2014	Aug. 30, 2013	Jul. 31, 2013	Jun. 30, 2013	Mar. 31, 2012	Mar. 31, 2010	Apr. 30, 2014	Sep. 30, 2013	May 31, 2013	Apr. 30, 2012	Feb. 29, 2012	Jan. 31, 2012	Aug. 31, 2008	Sep. 30, 2012	Oct. 31, 2006	Dec. 31, 2013		Jun. 30, 2013	Dec. 31, 2013		Dec. 31, 2008	Sep. 30, 2014	Oct. 31, 2012	Dec. 31, 2011	Mar. 31, 2014	Dec. 31, 2011	Jun. 30, 2011	Dec. 31, 2013		Jan. 31, 2007	Dec. 31, 2005 outage	Jun. 30, 2005	Apr. 30, 2009	Feb. 28, 2015	Jan. 31, 2015	Jul. 29, 2008	Dec. 31, 2010	Aug. 26, 2008
Regulatory Assets [Line Items]
Other operation and maintenance									$ 123,527,000		$ 341,537,000		$ 355,524,000
Period after Issuance of FERC Order to File a Comprehensive Bandwidth Recalculation Report						45 days
Rate and Regulatory Matters [Abstract]
Refund to customers including interest		84,000,000			30,600,000
Potential cost for Entergy Arkansas for years 2003, 2004, and 2006 based on intra-system bills				12,000,000
Other Regulatory Assets									4,968,553,000		3,893,363,000				4,968,553,000																																3,893,363,000			3,893,363,000									3,893,363,000
Period to File Briefs							30 days
Period to File Reply Briefs							21 days
Operation and maintenance expense									3,310,536,000		3,331,934,000		3,045,392,000
Income before income taxes									1,549,854,000		956,553,000		899,218,000
Deferred Fuel Cost									155,140,000		116,379,000				155,140,000																																116,379,000			116,379,000									116,379,000
Period of Prohibited Refunds							20 months	20 months						20 months
Number of Issues D.C. Circuit Ordered to Remand							2
Period to File Motions			30 days
Number of Orders Issued by FERC	2
Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Intervenor recommended disallowance of incremental project costs																		141,000,000
Other operation and maintenance									16,000,000
Bond proceeds loaned by LCDA to LURC under Louisiana Act 55 financing																	240,000,000
Annual customer credits																			4,800,000
Proceeds from Issuance of First Mortgage Bond																		190,000,000
LCDA issuance of bonds under Louisiana Act 55 financing																	243,850,000.00
Amount transfered to restricted escrow account as storm damage reserve																	13,000,000
Elimination of the Interruptible Load Period																											12 months
Rate and Regulatory Matters [Abstract]
Period Prior to Billing, Recovery of Electric Fuel and Purchased Power Costs									2 months
Formula rate plan extension request MISO Only scenario revenue offset																								2,000,000
Formula rate plan extension request sharing mechanism company																								40.00%
Formula Rate Plan Period																								3 years
Formula rate plan extension request sharing mechanism customers																								60.00%
Formula rate plan extension request MISO Only scenario common equity basis point range																								75.00%
Formula rate plan extension request MISO Only scenario midpoint return on common equity																								10.40%
Formula rate plan extension request MISO Only scenario authorized return on common equity																								10.40%
Formula rate plan extension request MISO Only scenario revenue increase authorization																								145,000,000
Storm Reserve Withdrawal		187,000,000
Requested Recovery of System Restoration Costs - Hurricane Isaac																						247,700,000
Storm restoration costs deemed prudently incurred - Hurricane Isaac																												224,300,000
Requested Replenishment of Storm Escrow Accounts Hurricane Issac																			200,000,000
Earned return on common equity																			9.95%		8.13%		10.40%
Approved Recovery Through Rider Revenues															915,000
Formula Rate Plan Extension Period																										1 year
Earnings bandwidth, basis points within bandwidth																			0.40%
Rate increase																			9,300,000	10,000,000	5,560,000		13,000,000
Rate Increase Through MISO Recovery Rider																			853,000
Rate Increase Period																					3 years		3 years
Rate Increase for Incremental Capacity Costs						18,100,000
Return on common equity on formula rate plan						9.63%																			10.38%
Rate increase value to reflect special formula rate plan rate implementation adjustment															41,600,000
Estimated Revenue Requirement Implemented for Ninemile 6															51,100,000
Per LPSC, the amount of damages to be paid by Entergy Arkansas to the Utility Operating Companies			7,000,000
Other Regulatory Assets									914,229,000		715,503,000				914,229,000																																715,503,000			715,503,000									715,503,000
Class preferred, non-voting, membership interest units																	2,272,725.89
Annual distribution rate																	7.50%
Liquidation price per unit																	100
Operation and maintenance expense									514,910,000		480,166,000		449,172,000
Income before income taxes									379,801,000		334,341,000		152,159,000
Refund to customers per LPSC Staff January 2013 audit report		1,900,000
Realignment of the recovery from Entergy Louisiana's fuel adjustment clause to base rates per LPSC January 2013 audit report		1,000,000
Number of Parties That Intervened in LPSC Proceeding		2
Number of Intervenors		1
Increase in incremental capacity rider																									15,900,000
Reduction for first-year capacity charges for purchase by Entergy Gulf States Louisiana from Entergy Louisiana of one-third of Acadia Unit 2 capacity and energy			17,000,000
Increase for first year retail revenue requirement associated with W3 replacement steam generator project			88,000,000
Recommended potential project and replacement power cost disallowances																		71,000,000
Minimum customer benefits																			23,900,000
Liquidation Value																												100,000,000																									100,000,000
Bond proceeds transfered to company under Louisiana Act 55 financing																	227,000,000
Bond proceeds used to acquire preferred units																	227,000,000
Entergy Louisiana [Member] | Hurricane Rita [Member]
Rate and Regulatory Matters [Abstract]
Minimum amount of benefits committed to pass on to the customers																																																				30,000,000
Prospective Annual rate reductions for five years																																																				6,000,000
Bond issued by LCDA																																																																			687,700,000
Amount transfer to restricted escrow account as storm damage reserve by corporation																													152,000,000
Amount Transferred to Entergy Louisiana																													527,000,000
Proceed from loan by LCDA to corporation LURC																													679,000,000
Amount used to acquire membership interest units in wholly owned Subsidiary																													545,000,000
Class preferred, non-voting, membership interest units																													5,449,861.85
Annual distribution rate																													10.00%
Liquidation price per unit																													100
Net worth required under terms of membership interest																													1,000,000,000
Amount withdrawn from restricted escrow account as approved by units of wholly owned subsidiary																													17,800,000
Entergy Louisiana [Member] | Hurricane Gustav and Ike [Member]
Rate and Regulatory Matters [Abstract]
Total recoverable costs																															394,000,000
Unrecoverable storm cost charged to earning																															7,200,000
Replenishment amount for storm reserve spending																															200,000,000
Minimum amount of benefits committed to pass on to the customers																																																																				27,800,000
Prospective Annual rate reductions for five years																																																																				5,600,000
Bond issued by LCDA																														468,900,000
Amount transfer to restricted escrow account as storm damage reserve by corporation																														200,000,000
Amount Transferred to Entergy Louisiana																														262,400,000
Proceed from loan by LCDA to corporation LURC																														462,400,000
Amount used to acquire membership interest units in wholly owned Subsidiary																														262,400,000
Class preferred, non-voting, membership interest units																														2,624,297.11
Annual distribution rate																														9.00%
Liquidation price per unit																														100
Net worth required under terms of membership interest																														1,000,000,000
Entergy Mississippi [Member]
Regulatory Assets [Line Items]
Requested Rate Increase Including New Depreciation Rates																			30,000,000
MPSC authorized deferral of other operation and maintenance expenses									6,000,000																							6,000,000
Rate and Regulatory Matters [Abstract]
Earned return on common equity																			10.59%				10.55%												10.59%	10.92%
MPSC Authorized Deferral of MISO Related Implementation Costs																																	1,200,000
Electric Base Revenue Increase																							36,300,000												22,300,000
Revenue adjustment cap																																					14,500,000
Current rate change limit of two percent of revenues																																					2.00%
Proposed rate change limit of four percent of revenues																																					4.00%
Eliminating the 50/50 sharing that had been in the plan																																					50.00%
Increase in Annual Funding for Storm Reserve																																		1,750,000.00
Per LPSC, the amount of damages to be paid by Entergy Arkansas to the Utility Operating Companies			23,000,000
Other Regulatory Assets									364,747,000		318,462,000				364,747,000																																318,462,000			318,462,000									318,462,000
Storm Restoration Costs Incurred Hurricane Isaac																																		32,000,000
Storm Restoration Costs Incurred That Are Recoverable Through Formula Rate Plan Hurricane Isaac																																		700,000
Storm Reserve Accrual Hurricane Isaac																																		750,000
Operation and maintenance expense									256,339,000		261,832,000		244,722,000
Cost incurred in planning evaluation and monitoring							57,000,000
Write-Off Of Regulatory Asset For New Nuclear									56,225,000		0		0
Income before income taxes									130,531,000		131,916,000		105,447,000
Deferred Fuel Cost									0		38,057,000				0																																38,057,000			38,057,000						60,400,000			38,057,000
Natural Gas Cost																				4.50
Public Utilities, Requested Rate Increase (Decrease), Amount																			49,000,000
Entergy Gulf States Louisiana [Member]
Regulatory Assets [Line Items]
Bond proceeds loaned by LCDA to LURC under Louisiana Act 55 financing																	69,000,000
Annual customer credits																			1,400,000
Proceeds from Issuance of First Mortgage Bond																		110,000,000
Issuance Mortgage Bonds, Three Point Seven Eight Percent																		0.0378
LCDA issuance of bonds under Louisiana Act 55 financing																	71,000,000
Amount transfered to restricted escrow account as storm damage reserve																	3,000,000
Rate and Regulatory Matters [Abstract]
Period Prior to Billing, Recovery of Electric Fuel and Purchased Power Costs									2 months
Formula rate plan extension request sharing mechanism company																								40.00%
Formula rate plan extension request sharing mechanism customers																								60.00%
Formula rate plan extension request MISO Only scenario common equity basis point range																								75.00%
Formula rate plan extension request MISO Only scenario midpoint return on common equity																								10.40%
Formula rate plan extension request MISO Only scenario revenue increase authorization																								24,000,000
Storm Reserve Withdrawal		65,000,000
Requested Recovery of System Restoration Costs - Hurricane Isaac																						73,800,000
Storm restoration costs deemed prudently incurred - Hurricane Isaac																												66,500,000
Requested Replenishment of Storm Escrow Accounts Hurricane Issac																			90,000,000
Earned return on common equity		11.18%				11.94%																			11.86%
Earnings bandwidth, basis points within bandwidth																																											10.50%
Rate reduction		43,000																																							100,000
Number of Proposed Adjustments to Gas Rate Stabilization Plan																							2
Extension Period of the Gas Rate Stabilization Plan																																								3 years
Public Utilities Recommended Midpoint Return On Common Equity																																								9.95%
Rate increase																																						1,500,000
Cost of Service Rate Change						6,500,000																			5,700,000
Rate Decrease for Incremental Capacity Costs						22,900,000																			20,300,000
Rate Increase for Incremental Capacity Costs																						7,300,000
Authorized return on common equity																																									11.54%		10.48%
Expected retail jurisdictional cost			17,000,000
Rate increase value to reflect special formula rate plan rate implementation adjustment															5,800,000
Estimated Revenue Requirement Implemented for Ninemile 6															26,800,000
Per LPSC, the amount of damages to be paid by Entergy Arkansas to the Utility Operating Companies			42,000,000
Other Regulatory Assets									426,381,000		321,466,000				426,381,000																																321,466,000			321,466,000									321,466,000
Class preferred, non-voting, membership interest units																	662,426.80
Annual distribution rate																	7.50%
Liquidation price per unit																	100
Class A preferred membership units sold to third party																																										500,000
Proceeds From Sale of Preferred Membership Units																																										51,000,000
Operation and maintenance expense									392,398,000		398,589,000		361,415,000
Charges Above Prevailing Market Prices									57,000,000
Low Damages Range In Texas Lawsuit									153,000,000
High Damages Range in Texas Lawsuit									972,000,000
Income before income taxes									251,273,000		218,481,000		211,593,000
Deferred Fuel Cost									0		9,625,000				0																																9,625,000			9,625,000									9,625,000
Minimum customer benefits																			6,900,000
Liquidation Value																												10,000,000																									10,000,000
LPSC Proposed Adjustments To Hurricane Isaac Storm Restoration Costs																																							1.00%
Bond proceeds transfered to company under Louisiana Act 55 financing																	66,000,000
Bond proceeds used to acquire preferred units																	66,000,000
Entergy Gulf States Louisiana [Member] | Hurricane Rita [Member]
Rate and Regulatory Matters [Abstract]
Minimum amount of benefits committed to pass on to the customers																																																				10,000,000
Prospective Annual rate reductions for five years																																																				2,000,000
Bond issued by LCDA																																																																					278,400,000
Amount transfer to restricted escrow account as storm damage reserve by corporation																																												87,000,000
Amount Transferred to Entergy Louisiana																																												187,700,000
Proceed from loan by LCDA to corporation LURC																																												274,700,000
Amount used to acquire membership interest units in wholly owned Subsidiary																																												189,400,000
Class preferred, non-voting, membership interest units																																												1,893,918.39
Annual distribution rate																																												10.00%
Liquidation price per unit																																												100
Net worth required under terms of membership interest																																												1,000,000,000
Amount withdrawn from restricted escrow account as approved by units of wholly owned subsidiary																																												1,700,000
Entergy Gulf States Louisiana [Member] | Hurricane Gustav and Ike [Member]
Rate and Regulatory Matters [Abstract]
Total recoverable costs																															234,000,000
Unrecoverable storm cost charged to earning																															4,400,000
Replenishment amount for storm reserve spending																															90,000,000
Minimum amount of benefits committed to pass on to the customers																																																																				15,500,000
Prospective Annual rate reductions for five years																																																																				3,100,000
Bond issued by LCDA																														244,100,000
Amount transfer to restricted escrow account as storm damage reserve by corporation																														90,000,000
Amount Transferred to Entergy Louisiana																														150,300,000
Proceed from loan by LCDA to corporation LURC																														240,300,000
Amount used to acquire membership interest units in wholly owned Subsidiary																														150,300,000
Class preferred, non-voting, membership interest units																														1,502,643.04
Annual distribution rate																														9.00%
Liquidation price per unit																														100
Net worth required under terms of membership interest																														1,000,000,000
Entergy New Orleans [Member]
Rate and Regulatory Matters [Abstract]
Storm Reserve Withdrawal																									17,400,000
Electric Base Revenue Increase						4,900,000
Gas Base Revenue Increase																																													50,000
Electric Base Revenue Decrease																																	1,625,000
Refund To Customers																																																		6,000,000
Customer Refund Period																																																		4 months
Additional Provision Recorded For Refund To Customers																																																	1,100,000
Long-term Contract for Purchase of Electric Power, Share of Plant Output Being Purchased															20.00%
Amount included in electric rates per year to fund the smart energy efficiency programs as per rate case settlement																																																				3,100,000
Energy Smart Program Costs																																															3,500,000
Electric rate increase																																													4,900,000
Increase in Annual Funding for Storm Reserve						5,700,000
Per LPSC, the amount of damages to be paid by Entergy Arkansas to the Utility Operating Companies			4,000,000
Other Regulatory Assets									175,596,000		137,191,000				175,596,000																																137,191,000			137,191,000									137,191,000
Storm Restoration Costs Incurred Hurricane Isaac																									47,300,000
Amount authorized for storm reserve																																														75,000,000
Operation and maintenance expense									120,610,000		136,003,000		122,143,000
Income before income taxes									41,031,000		13,302,000		24,305,000
Entergy Texas [Member]
Regulatory Assets [Line Items]
Under-recovered fuel balance																																						8,700,000
Rate and Regulatory Matters [Abstract]
System Agreement Bandwidth Remedy Payments																	15,300,000
Request filed for refund of fuel cost recovery over collections				37,500,000													24,600,000																																					78,000,000	43,000,000
Refund for fuel cost recovery																																																									67,000,000
Earned return on common equity																					9.20%																	9.80%	10.40%		9.60%																	10.60%
Requested increase in retail revenues per request for annual distribution cost recovery factor rider																																																					7,000,000
Approved Recovery Through Rider Revenues															3,600,000
Rate Case Filing Request To Reconcile Fuel and Purchased Power Costs and Fuel Revenues																																							900,000,000
Rate Case Filing Request Special Circumstances Fuel Cost Recovery Of Purchased Power Costs																																							22,000,000
Rate reduction																					300,000
Rate increase				28,000,000																																		18,500,000	38,600,000																	18,500,000
Increase In Base Rate Reflecting Return On Common Equity																																																										112,000,000
Earned return on common equity				9.80%
Recommended Increase in Rate Base																																									66,000,000
Revised Increase In Rate Base Request																																									105,000,000
MISO transition expenses in base rates per PUCT																																													1,600,000
Reduction of fuel reconciliation recovery due to disagreement with line loss factor in calculation per PUCT																																													4,000,000
Regulatory charge recorded due to probability of non-recovery per PUCT order																																													24,000,000
Other Regulatory Assets									922,087,000		919,234,000				922,087,000																																919,234,000			919,234,000									919,234,000
Operation and maintenance expense									232,955,000		253,786,000		233,503,000
Income before income taxes									124,448,000		87,989,000		75,089,000
Deferred Fuel Cost									11,861,000		0				11,861,000																																0			0									0
System Agreement Bandwidth Remedy Receipts																				48,600,000
Entergy Texas [Member] | Hurricane Rita [Member]
Rate and Regulatory Matters [Abstract]
Financing order authorized to issue storm cost recovery bonds																											353,000,000
Entergy Arkansas [Member]
Rate and Regulatory Matters [Abstract]
Period in which deferred cost balance is paid									7 months
Period in which costs are collected from customer									12 months
Redetermination Of Production Cost Allocation Rider Unrecovered Retail Balance																				3,000,000
System Agreement Bandwidth Remedy Payments																				67,800,000
Energy Cost Recovery Rider, Energy Cost Rate, Costs and Expected Sales, Period									12 months
Number of Outages																																																														2
Response Period For Analysis to Determine Additional Fuel and Purchased Energy Costs																																																													60 days
Incremental Fuel and Replacement Energy Costs																					65,900,000
Regulatory Asset, Noncurrent, Amortization Period											5 years
APSC filing requested rate increase transition to MISO scenario																							174,000,000																145,000,000
APSC filing requested revenue transfer from collection in riders to base rates MISO scenario																							49,000,000
Earned return on common equity																							10.40%																10.40%																				9.30%
Public Utilities, Approved Return on Equity, Percentage																	9.50%				9.30%
APSC Filing Authorized Rate Increase Transition to MISO Scenario																																																											81,000,000
Amount Collected From Customers																																										156,000,000
Potential cost for Entergy Arkansas for years 2003, 2004, and 2006 based on intra-system bills																						2,300,000
Reduction In Amount Of Damages That Should Be Paid By Entergy Arkansas To Utility Operating Companies																																	20.00%
Other Regulatory Assets									1,391,276,000		1,014,392,000				1,391,276,000																																1,014,392,000			1,014,392,000									1,014,392,000
Operation and maintenance expense									647,461,000		592,892,000		545,782,000
Income before income taxes									205,021,000		253,735,000		247,171,000
Entergy Arkansas 2012 Winter Storm Related Regulatory Asset									22,000,000
Deferred Fuel Cost									143,279,000		68,696,000				143,279,000																																68,696,000			68,696,000									68,696,000
Production Cost Allocation Rider Adjustment Collection Period																																										22 months
System Energy [Member]
Rate and Regulatory Matters [Abstract]
Payments from utility operating companies as percentage of average production cost																																																															11.00%
Other Regulatory Assets									335,613,000		261,740,000				335,613,000																																261,740,000			261,740,000									261,740,000
Operation and maintenance expense									156,502,000		174,772,000		149,346,000
Income before income taxes									179,644,000		182,517,000		188,981,000
Entergy Holdings Company LLC [Member]
Rate and Regulatory Matters [Abstract]
Net worth required under terms of membership interest																	1,750,000,000
Minimum [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Amortization period of cost									2 years
Minimum [Member] | Entergy Mississippi [Member]
Rate and Regulatory Matters [Abstract]
Amortization period of cost									2 years
Minimum [Member] | Entergy New Orleans [Member]
Rate and Regulatory Matters [Abstract]
Amortization period of cost									2 years
Minimum [Member] | Entergy Arkansas [Member]
Rate and Regulatory Matters [Abstract]
Amortization period of cost									2 years
Maximum [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Amortization period of cost									27 years
Maximum [Member] | Entergy Mississippi [Member]
Rate and Regulatory Matters [Abstract]
Amortization period of cost									27 years
Maximum [Member] | Entergy New Orleans [Member]
Rate and Regulatory Matters [Abstract]
Amortization period of cost									27 years
Maximum [Member] | Entergy Arkansas [Member]
Rate and Regulatory Matters [Abstract]
Amortization period of cost									27 years
Estimated Arkansas 2012 Winter Storm Total Restoration Costs									63,000,000
Gas [Member] | Entergy Gulf States Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Earned return on common equity																					5.47%
Rate increase																					1,500,000
Gas [Member] | Entergy New Orleans [Member]
Rate and Regulatory Matters [Abstract]
Formula Rate Plan Period																																																																3 years
Earnings bandwidth, basis points within bandwidth																																																																0.40%
Return on common equity on formula rate plan																																																																11.10%
Electric [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Formula Rate Plan Period																																																											3 years
Formula Rate Plan Extension Approved MISO Only Scenario Midpoint Return On Common Equity																																																											9.95%
Formula Rate Plan Extension Approved MISO Only Scenario Common Equity Basis Point Range																																																											80.00%
Formula Rate Plan Extension Approved Sharing Mechanism Customers																																																											60.00%
Formula Rate Plan Extension Approved Sharing Mechanism Company																																																											40.00%
Cumulative Cap on Cost of Service Increases																																																											30,000,000
Rate increase																																																											10,000,000
Electric [Member] | Entergy Gulf States Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Formula Rate Plan Period																																																											3 years
Formula Rate Plan Extension Approved MISO Only Scenario Midpoint Return On Common Equity																																																											9.95%
Formula Rate Plan Extension Approved MISO Only Scenario Common Equity Basis Point Range																																																											80.00%
Formula Rate Plan Extension Approved Sharing Mechanism Customers																																																											60.00%
Formula Rate Plan Extension Approved Sharing Mechanism Company																																																											40.00%
Electric [Member] | Entergy New Orleans [Member]
Rate and Regulatory Matters [Abstract]
Basis Point Bandwidth																																																																0.50%
Return on common equity on formula rate plan																																																																10.75%
Human Capital Management Costs [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets									42,300,000		45,000,000				42,300,000																																45,000,000			45,000,000									45,000,000
Human Capital Management Costs [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets									13,800,000		13,000,000				13,800,000																																13,000,000			13,000,000									13,000,000
Human Capital Management Costs [Member] | Entergy Gulf States Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets									11,200,000		10,000,000				11,200,000																																10,000,000			10,000,000									10,000,000
Human Capital Management Costs [Member] | Entergy Arkansas [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Asset, Noncurrent, Amortization Period											3 years 6 months
Other Regulatory Assets									17,300,000	[1]	22,000,000	[1]			17,300,000	[1]																															22,000,000	[1]		22,000,000	[1]								22,000,000	[1]
Human Capital Management Costs [Member] | Electric [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Amortization period of cost																																																											3 years
Human Capital Management Costs [Member] | Electric [Member] | Entergy Gulf States Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Amortization period of cost																																																											3 years
Nuclear Generation Development Costs [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Asset, Noncurrent, Amortization Period									8 years
Other Regulatory Assets									29,200,000	[1]	29,500,000	[1]			29,200,000	[1]																															29,500,000	[1]		29,500,000	[1]								29,500,000	[1]
Nuclear Generation Development Costs [Member] | Entergy Gulf States Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Asset, Noncurrent, Amortization Period											8 years
Other Regulatory Assets									29,200,000	[1]	29,500,000	[1]			29,200,000	[1]																															29,500,000	[1]		29,500,000	[1]								29,500,000	[1]
Nuclear Generation Development Costs [Member] | Electric [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Amortization period of cost																																																											8 years
Nuclear Generation Development Costs [Member] | Electric [Member] | Entergy Gulf States Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Amortization period of cost																																																											8 years
Asset Retirement Obligation Costs [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets									513,800,000	[2]	447,600,000	[2]			513,800,000	[2]																															447,600,000	[2]		447,600,000	[2]								447,600,000	[2]
Asset Retirement Obligation Costs [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets									156,700,000	[2]	139,200,000	[2]			156,700,000	[2]																															139,200,000	[2]		139,200,000	[2]								139,200,000	[2]
Asset Retirement Obligation Costs [Member] | Entergy Mississippi [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets									6,300,000	[2]	5,900,000	[2]			6,300,000	[2]																															5,900,000	[2]		5,900,000	[2]								5,900,000	[2]
Asset Retirement Obligation Costs [Member] | Entergy Gulf States Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets									10,800,000	[2]	11,000,000	[2]			10,800,000	[2]																															11,000,000	[2]		11,000,000	[2]								11,000,000	[2]
Asset Retirement Obligation Costs [Member] | Entergy New Orleans [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets									3,800,000	[2]	3,700,000	[2]			3,800,000	[2]																															3,700,000	[2]		3,700,000	[2]								3,700,000	[2]
Asset Retirement Obligation Costs [Member] | Entergy Arkansas [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets									254,800,000	[2]	225,900,000	[2]			254,800,000	[2]																															225,900,000	[2]		225,900,000	[2]								225,900,000	[2]
Asset Retirement Obligation Costs [Member] | System Energy [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets									80,400,000	[2]	60,800,000	[2]			80,400,000	[2]																															60,800,000	[2]		60,800,000	[2]								60,800,000	[2]
Subsequent Event [Member] | Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Estimated value of net assets that support Algiers customers to be transferred																																60,000,000
Subsequent Event [Member] | Entergy Mississippi [Member]
Rate and Regulatory Matters [Abstract]
Public Utilities, Approved Return on Equity, Percentage																																10.07%
Authorized Storm Damage Reserve Balance																																																																		15,000,000
Balance At Which Storm Damage Accrual Will Return To Current Level																																																																	10,000,000
Storm Reserve Accrual Hurricane Isaac																																																																	0
Net increase in revenues per joint stipulation entered into with MPSC																																16,000,000
Subsequent Event [Member] | Entergy Gulf States Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Approved Recovery Through Rider Revenues																																																																		65,000,000
Adjustment to rider revenue requirement required if earnings exceed stated rate																																																																		10.45%
Rate increase																																																																		706,000
Authorized return on common equity																																																																		7.20%
Subsequent Event [Member] | Entergy New Orleans [Member]
Rate and Regulatory Matters [Abstract]
Energy Smart Program Costs																																																																		1,200,000
Amount authorized for storm reserve																																																																		75,000,000
Hurricane Isaac Storm Restoration Costs Approved as Recoverable from Electric Customers																																																																		31,700,000
Subsequent Event [Member] | Entergy Arkansas [Member]
Rate and Regulatory Matters [Abstract]
Production Cost Allocation Rider Under-recovered Retail Balance Approved for Recovery																																																																		3,000,000
System Agreement Bandwidth Remedy Payments Approved for Recovery																																																																		67,800,000
Energy Smart 2 Project Costs																																																																		12,800,000
Approved Total Hurricane Isaac Storm Restoration Costs																																																																		$ 49,300,000

[1] Does not earn a return on investment.

[2] Does not earn a return on investment, but is offset by related liabilities.