Rate And Regulatory Matters (Narrative) (Details)		1 Months Ended																																																				3 Months Ended					4 Months Ended	9 Months Ended	12 Months Ended					20 Months Ended
		Feb. 29, 2016 USD ($) $ / unit	Jan. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Nov. 30, 2015 USD ($)	Sep. 30, 2015 USD ($)	Aug. 31, 2015 USD ($) $ / unit shares	Jul. 31, 2015 USD ($)	May. 31, 2015 USD ($)	Apr. 30, 2015 USD ($)	Feb. 28, 2015 USD ($)	Jan. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Oct. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Aug. 31, 2014 USD ($)	Jul. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	May. 31, 2014 USD ($) $ / unit	Apr. 30, 2014 USD ($)	Jan. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Oct. 31, 2013 USD ($)	Sep. 30, 2013 USD ($)	Aug. 30, 2013 USD ($)	Jul. 31, 2013 USD ($)	Jun. 30, 2013 USD ($)	May. 31, 2013	Apr. 30, 2013 USD ($)	Mar. 31, 2013 USD ($)	Feb. 28, 2013 USD ($)	Jan. 31, 2013 USD ($) party intervenor	Dec. 31, 2012 USD ($)	Nov. 30, 2012	Oct. 31, 2012 USD ($)	Sep. 30, 2012 USD ($)	Aug. 31, 2012 USD ($)	Jul. 31, 2012 USD ($)	May. 31, 2012 USD ($)	Apr. 30, 2012 USD ($)	Feb. 29, 2012 USD ($) shares	Nov. 30, 2011 USD ($)	Oct. 31, 2011 USD ($) issue	Jul. 31, 2010 USD ($) $ / unit shares	Dec. 31, 2009 USD ($)	Apr. 30, 2009	Aug. 31, 2008 USD ($) $ / unit shares	Jul. 31, 2008 USD ($) shares	Apr. 30, 2008	Apr. 30, 2007 USD ($)	Jan. 31, 2007	Oct. 31, 2006 USD ($)	Jun. 30, 2005	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Jun. 30, 2013 USD ($)	Dec. 31, 2013 USD ($)	Sep. 30, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2005 outage	May. 02, 2003	Sep. 01, 2015 USD ($)	Dec. 31, 2010 USD ($)	Aug. 26, 2008 USD ($)	Jul. 29, 2008 USD ($)
Rate and Regulatory Matters [Abstract]
Asset Write-Offs, Impairments, And Related Charges																																																													$ 2,104,906,000	$ 123,527,000	$ 341,537,000
Asset Write-Offs, Impairments, And Related Charges																																																													2,104,906,000	179,752,000	341,537,000
Write-Off of Waterford 3 Replacement Steam Generator				$ 77,000,000
Potential cost for Entergy Arkansas for years 2003, 2004, and 2006 based on intra-system bills																																						$ 12,000,000
Other Regulatory Assets				4,704,796,000									$ 4,968,553,000																																									$ 4,704,796,000							4,704,796,000	4,968,553,000
Period to File Briefs																																											30 days
Period to File Reply Briefs																																											21 days
Operation and maintenance expense																																																													3,354,981,000	3,310,536,000	3,331,934,000
Income before income taxes																																																													(799,661,000)	1,549,854,000	956,553,000
Deferred Fuel Cost				0									155,140,000																																									0							$ 0	155,140,000
Period of Prohibited Refunds																																											20 months						20 months																	20 years
Number of Issues D.C. Circuit Ordered to Remand | issue																																											2
Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Decrease in estimated costs at completion for Ninemile 6 project								$ 76,000,000
Rate Increase Included in Formula Rate Plan					$ 10,000,000	$ 35,700,000
Adjustment to formula rate plan for reduction in MISO cost recovery mechanism						$ 5,500,000
Bond proceeds loaned by LCDA to LURC under Louisiana Act 55 financing							$ 309,000,000
Proceeds from Issuance of First Mortgage Bond								300,000,000
Annual customer credits																		$ 6,200,000
LCDA issuance of bonds under Louisiana Act 55 financing							314,850,000
Issuance Mortgage Bonds, Three Point Seven Eight Percent																	$ 0.0378
Amount transfered to restricted escrow account as storm damage reserve							16,000,000
Elimination of the Interruptible Load Period																																																		12 months
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
Amortization period of cost																																																													27 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																																$ 252,000,000
Requested Recovery of System Restoration Costs - Hurricane Isaac																													$ 321,500,000
Storm restoration costs deemed prudently incurred - Hurricane Isaac																																																												$ 290,800,000
Requested Replenishment of Storm Escrow Accounts Hurricane Issac																		$ 290,000,000
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																		0.00%
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																		4 years			3 years									3 years
Rate Increase for Incremental Capacity Costs																																							$ 18,100,000
Return on common equity on formula rate plan						9.09%																															10.38%		9.63%
Adjustment to formula rate plan to decrease additional capacity mechanism						$ 17,800,000
Rate increase value to reflect special formula rate plan rate implementation adjustment													$ 41,600,000
Number of Issues Identified by LPSC Staff													5
Number of Issues Remaining with LPSC Staff													2
Project and Replacement Power Cost Disallowances				2,000,000													71,000,000
ALJ Recommended Charges Related to Waterford 3 Steam Generator Project																																																						77,000,000
Intervenor Recommended Project and Replacement Power Cost Disallowances																	$ 141,000,000
Asset Write-Offs, Impairments, And Related Charges													$ 16,000,000
ALJ Recommended Disallowance of Capital Costs				67,000,000
Write-Off of Waterford 3 Replacement Steam Generator																																																						45,000,000
Regulatory Charge Recorded Due to Probability of Non-Recovery Per ALJ Recommendation																																																						32,000,000
Estimated Revenue Requirement Implemented for Ninemile 6													51,100,000
Estimated costs at completion for Ninemile 6 project								648,000,000
Per LPSC, the amount of damages to be paid by Entergy Arkansas to the Utility Operating Companies																																	$ 7,000,000
Other Regulatory Assets				1,217,874,000									1,340,610,000																																									1,217,874,000							$ 1,217,874,000	1,340,610,000
Operation and maintenance expense																																																													997,546,000	907,308,000	878,755,000
Income before income taxes																																																													625,310,000	631,074,000	552,822,000
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 | party																																2
Number of Intervenors | intervenor																																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
Rate Increase Included in Legacy Formula Rate Plan								10,000,000
Allowed Maximum Deferred External Costs Associated with Business Combination								25,000,000
Deferred External Costs Associated with Business Combination																																																													$ 16,000,000
Purchase price of net assets that support Algiers customers																																																																			$ 85,000,000
Minimum customer benefits																		$ 30,800,000
Bond proceeds transfered to company under Louisiana Act 55 financing							293,000,000
Estimated Customer Benefits Anticipated with Business Combination															$ 128,000,000
Proposed Guaranteed Savings Projected for Business Combination															97,000,000
Customer Benefits Anticipated with Business Combination Per Stipulated Settlement with LPSC								107,000,000
Upper Limit on Rates								30,000,000
Entergy Louisiana [Member] | Hurricane Rita [Member]
Rate and Regulatory Matters [Abstract]
Minimum amount of benefits committed to pass on to the customers																																																																$ 40,000,000
Prospective Annual rate reductions for five years																																																																8,000,000
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 | shares																																																5,449,861.85
Annual distribution rate																																																10.00%
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																																													$ 628,000,000
Unrecoverable storm cost charged to earning																																													11,600,000
Replenishment amount for storm reserve spending																																													$ 290,000,000
Minimum amount of benefits committed to pass on to the customers																																																																				$ 43,300,000
Prospective Annual rate reductions for five years																																																																				$ 8,700,000
Bond issued by LCDA																																												$ 713,000,000
Amount transfer to restricted escrow account as storm damage reserve by corporation																																												290,000,000
Amount Transferred to Entergy Louisiana																																												412,700,000
Proceed from loan by LCDA to corporation LURC																																												702,700,000
Amount used to acquire membership interest units in wholly owned Subsidiary																																												$ 412,700,000
Class preferred, non-voting, membership interest units | shares																																												4,126,940.15
Annual distribution rate																																												9.00%
Liquidation price per unit | $ / unit																																												100
Net worth required under terms of membership interest																																												$ 1,000,000,000
Entergy Mississippi [Member]
Rate and Regulatory Matters [Abstract]
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
Amortization period of cost																																																													27 years
Earned return on common equity																		10.59%									10.59%			10.55%
Public Utilities, Approved Return on Equity, Percentage														10.07%
MPSC Authorized Deferral of MISO Related Implementation Costs																									$ 1,200,000
Electric Base Revenue Increase																											$ 22,300,000			$ 36,300,000
Increase in Annual Funding for Storm Reserve																										$ 1,750,000.00
Authorized Storm Damage Reserve Balance												$ 15,000,000
Balance At Which Storm Damage Accrual Will Return To Current Level											$ 10,000,000
Per LPSC, the amount of damages to be paid by Entergy Arkansas to the Utility Operating Companies																																	23,000,000
Other Regulatory Assets				328,681,000									364,747,000																																									328,681,000							$ 328,681,000	364,747,000
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											$ 0															$ 750,000
Operation and maintenance expense																																																													261,255,000	256,339,000	261,832,000
Cost incurred in planning evaluation and monitoring																																											$ 57,000,000
Write-Off Of Regulatory Asset For New Nuclear																																																								$ 61,000,000					0	56,225,000	0
Income before income taxes																																																													154,580,000	130,531,000	131,916,000
Deferred Fuel Cost																																																									$ 60,400,000
Natural Gas Cost | $ / unit																			4.50
Public Utilities, Requested Rate Increase (Decrease), Amount																		$ 49,000,000
Net increase in revenues per joint stipulation entered into with MPSC														$ 16,000,000
Deferred Fuel Over-Recovery Balance									$ 58,300,000
Under-Recovery Under Power Management Rider									12,300,000
Net Over-Recovery of Rider Revenues								46,000,000
Entergy Gulf States Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Power blocks												2
Adjustment to formula rate plan to increase additional capacity mechanism						4,300,000
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
Earned return on common equity																																11.18%
Approved Recovery Through Rider Revenues												$ 65,000,000
Adjustment to rider revenue requirement required if earnings exceed stated rate												10.45%
Range of Adherence to a Specified Spending Plan												20.00%
Actual Versus Planned Rider Spending Variance												10.00%
Rate reduction																																$ 43,000
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												$ 706,000								$ 1,500,000
Authorized return on common equity												7.20%
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
Class A preferred membership units sold to third party | shares																																									500,000
Proceeds From Sale of Preferred Membership Units																																									$ 51,000,000
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
Recommended adjustment to earned return on equity										7.24%
Net increase in revenues per joint stipulation entered into with MPSC										$ 688,000
Expected Base Purchase Price Union Power Station Power Block												$ 237,000,000
Entergy Gulf States Louisiana [Member] | Hurricane Rita [Member]
Rate and Regulatory Matters [Abstract]
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 | shares																																															1,893,918.39
Annual distribution rate																																															10.00%
Liquidation price per unit | $ / 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 New Orleans [Member]
Rate and Regulatory Matters [Abstract]
Amortization period of cost																																																													27 years
Storm Reserve Withdrawal																																					17,400,000
Electric Base Revenue Increase																																							$ 4,900,000
Gas Base Revenue Increase																																				$ 50,000			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												1,200,000											$ 3,500,000
Energy Smart 2 Project Costs												12,800,000
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
Financing order authorized to issue storm cost recovery bonds									98,700,000
Replenishment amount for storm reserve spending									63,900,000
Other Regulatory Assets				265,322,000									$ 194,851,000																																									265,322,000							$ 265,322,000	194,851,000
Storm Restoration Costs Incurred Hurricane Isaac																																					$ 47,300,000
Amount authorized for storm reserve												75,000,000																																								$ 75,000,000
Operation and maintenance expense																																																													119,087,000	131,549,000	146,754,000
Income before income taxes																																																													70,115,000	44,480,000	14,885,000
Purchase price of net assets that support Algiers customers						85,000,000																																																	$ 85,000,000
Repayment of long-term payable due to Entergy Louisiana																																																													(59,610,000)	0	0
Payable due Entergy Louisiana				25,500,000																																																		25,500,000							25,500,000						$ 25,500,000
Hurricane Isaac Storm Restoration Costs Approved as Recoverable from Electric Customers												31,700,000
Expected Base Purchase Price Union Power Station Power Block							$ 237,000,000
Entergy Texas [Member]
Rate and Regulatory Matters [Abstract]
Under-recovered fuel balance																				$ 8,700,000
System Agreement Bandwidth Remedy Payments								$ 10,900,000								$ 15,300,000
Refund to customers including interest																																$ 84,000,000
Request filed for refund of fuel cost recovery over collections																$ 24,600,000																			$ 78,000,000			$ 37,500,000
Earned return on common equity																				9.80%	9.20%			10.40%										10.60%						9.60%
Write-off of Rate Case Expenses and Acquisition Costs																																																							$ 4,700,000
Requested increase in retail revenues per request for annual distribution cost recovery factor rider						6,500,000									$ 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																				$ 18,500,000				38,600,000												$ 28,000,000																					$ 18,500,000
Increase In Base Rate Reflecting Return On Common Equity																																										$ 112,000,000
Asset Write-Offs, Impairments, And Related Charges																																																													23,472,000	0	0
After tax asset impairment charge																																																													15,300,000
Earned return on common equity																																				9.80%
Recommended Increase in Rate Base																																								$ 66,000,000
Revised Increase In Rate Base Request																																								$ 105,000,000
Amount Collected From Customers						10,100,000
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				812,862,000									922,087,000																																									812,862,000							812,862,000	922,087,000
Operation and maintenance expense																																																													254,731,000	232,955,000	253,786,000
Income before income taxes																																																													106,875,000	124,448,000	87,989,000
Deferred Fuel Cost				$ 0									11,861,000																																									0							$ 0	11,861,000
Public Utilities, Requested Rate Increase (Decrease), Amount						13,000,000
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									$ 38,000,000										$ 67,800,000
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 Cost Recovery Rider, Energy Cost Rate, Costs and Expected Sales, Period																																																													12 months
Number of Outages | outage																																																																	2
Response Period For Analysis to Determine Additional Fuel and Purchased Energy Costs																																																			60 days
Incremental Fuel and Replacement Energy Costs																					$ 65,900,000
Amortization period of cost																																																													27 years
APSC filing requested rate increase transition to MISO scenario																								$ 145,000,000						$ 174,000,000
APSC filing requested revenue transfer from collection in riders to base rates MISO scenario																														$ 49,000,000
Earned return on common equity				9.75%						10.20%												9.30%		10.40%						10.40%
Public Utilities, Approved Return on Equity, Percentage																9.50%					9.30%
APSC Filing Authorized Rate Increase Transition to MISO Scenario																						$ 81,000,000
Basis Point Bandwidth				50.00%
Rate increase				$ 225,000,000						$ 268,400,000
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				1,333,773,000									1,391,276,000																																									1,333,773,000							$ 1,333,773,000	1,391,276,000
Operation and maintenance expense																																																													734,118,000	647,461,000	592,892,000
Income before income taxes																																																													114,813,000	205,021,000	253,735,000
Entergy Arkansas 2012 Winter Storm Related Regulatory Asset																																																													22,000,000
Deferred Fuel Cost				0									143,279,000																																									0							0	143,279,000
Production Cost Allocation Rider Adjustment Collection Period																																									22 months
Approved Total Hurricane Isaac Storm Restoration Costs												$ 49,300,000
Net increase in revenues per joint stipulation entered into with MPSC				133,000,000						$ 167,000,000
APSC and Intervener Recommended Revenue Requirement						217,900,000
APSC and Intervener Recommended Return on Equity						$ 0.0965
Expected Base Purchase Price Union Power Station Power Block				237,000,000
System Energy [Member]
Rate and Regulatory Matters [Abstract]
Payments from utility operating companies as percentage of average production cost																																																					11.00%
Other Regulatory Assets				347,830,000									335,613,000																																									347,830,000							347,830,000	335,613,000
Operation and maintenance expense																																																													156,552,000	156,502,000	174,772,000
Income before income taxes																																																													164,395,000	179,644,000	$ 182,517,000
Entergy Holdings Company LLC [Member]
Rate and Regulatory Matters [Abstract]
Class preferred, non-voting, membership interest units | shares							2,935,152.69
Annual distribution rate							7.50%
Liquidation price per unit | $ / unit							100
Net worth required under terms of membership interest							$ 1,750,000,000
Maximum [Member] | Entergy Arkansas [Member]
Rate and Regulatory Matters [Abstract]
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																																														40.00%
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																																														0.00%
Return on common equity on formula rate plan																																														10.75%
Human Capital Management Costs [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets				28,300,000									42,300,000																																									28,300,000							28,300,000	42,300,000
Human Capital Management Costs [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets				17,600,000									25,000,000																																									17,600,000							17,600,000	$ 25,000,000
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	[1]			10,400,000									17,300,000																																									10,400,000							$ 10,400,000	$ 17,300,000
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	[1]			50,400,000									58,400,000																																									50,400,000							$ 50,400,000	58,400,000
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	[2]			589,100,000									513,800,000																																									589,100,000							589,100,000	513,800,000
Asset Retirement Obligation Costs [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets	[2]			180,800,000									167,500,000																																									180,800,000							180,800,000	167,500,000
Asset Retirement Obligation Costs [Member] | Entergy Mississippi [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets	[2]			6,700,000									6,300,000																																									6,700,000							6,700,000	6,300,000
Asset Retirement Obligation Costs [Member] | Entergy New Orleans [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets	[2]			4,000,000									3,800,000																																									4,000,000							4,000,000	3,800,000
Asset Retirement Obligation Costs [Member] | Entergy Arkansas [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets	[2]			288,000,000									254,800,000																																									288,000,000							288,000,000	254,800,000
Asset Retirement Obligation Costs [Member] | System Energy [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets	[2]			$ 108,600,000									$ 80,400,000																																									$ 108,600,000							$ 108,600,000	$ 80,400,000
Subsequent Event [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Earned return on common equity			10.22%
Subsequent Event [Member] | Entergy Mississippi [Member]
Rate and Regulatory Matters [Abstract]
Natural Gas Cost | $ / unit		2.45
Net Over-Recovery of Rider Revenues			$ 48,000,000
Subsequent Event [Member] | Entergy Arkansas [Member]
Rate and Regulatory Matters [Abstract]
Reduction in Retail Rate Increase Proposed in Initial Settlement		$ 5,000,000

[1] Does not earn a return on investment.

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