Rate And Regulatory Matters (Narrative) (Details)			1 Months Ended																																																						3 Months Ended			9 Months Ended	11 Months Ended	12 Months Ended						24 Months Ended	36 Months Ended		72 Months Ended
		Jan. 01, 2018 USD ($)	Feb. 28, 2019 USD ($)	Jan. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Nov. 30, 2018 USD ($)	Oct. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Aug. 31, 2018 USD ($)	Jul. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	May 31, 2018 USD ($)	Apr. 30, 2018 USD ($)	Mar. 31, 2018 USD ($) $ / kWh	Feb. 28, 2018 USD ($)	Dec. 31, 2017 USD ($)	Nov. 30, 2017 USD ($)	Oct. 31, 2017 USD ($)	Aug. 31, 2017	Jul. 31, 2017 USD ($)	Jun. 30, 2017 USD ($)	May 31, 2017 USD ($)	Apr. 30, 2017 USD ($)	Mar. 31, 2017 $ / kWh	Jan. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Nov. 30, 2016 USD ($)	Oct. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jul. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	May 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Feb. 29, 2016 USD ($)	Dec. 31, 2015 USD ($)	Nov. 30, 2015 USD ($)	Oct. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Aug. 31, 2015 USD ($)	Jul. 31, 2015 USD ($)	May 31, 2015 USD ($)	Apr. 30, 2015 USD ($)	Jan. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Aug. 31, 2014 USD ($) $ / unit shares	Jul. 31, 2014 USD ($)	Jun. 30, 2014 USD ($)	Jan. 31, 2014 USD ($)	Feb. 29, 2012 USD ($) shares	Jul. 31, 2010 USD ($) $ / unit shares	Jun. 30, 2010 USD ($)	Aug. 31, 2008 USD ($) $ / unit shares	Jul. 31, 2008 USD ($) shares	Apr. 30, 2007 USD ($)	Jun. 30, 2005	Sep. 30, 2018 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) $ / kWh	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2024 USD ($)	Nov. 01, 2017 USD ($)	Apr. 30, 2010 USD ($)	Aug. 26, 2008 USD ($)	Jul. 29, 2008 USD ($)	Apr. 30, 2008 USD ($)
Regulatory Assets [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%																																																														35.00%
Rate and Regulatory Matters [Abstract]
Asset Write-Offs, Impairments, And Related Charges																																																															$ 491,739,000	$ 357,251,000	$ 2,835,637,000
Payments to Acquire Other Property, Plant, and Equipment																																																															(26,623,000)	(16,762,000)	(949,329,000)
Income before income taxes																																																															(174,271,000)	967,923,000	(1,381,762,000)
Deferred Fuel Cost					$ 27,251,000											$ 95,746,000																																															27,251,000	95,746,000
Regulatory Assets, Noncurrent					4,746,496,000											4,935,689,000																																															4,746,496,000	4,935,689,000
Regulatory Liability, Noncurrent					1,620,254,000											1,588,520,000																																															1,620,254,000	1,588,520,000
Increase (Decrease) in Regulatory Liabilities																																																															$ (803,323,000)	2,915,795,000	158,031,000
Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Portion of Waterford 3 purchase price satisfied through issuance of debt																																		$ 52,000,000
Rate and Regulatory Matters [Abstract]
Rate Increase Included in Formula Rate Plan										$ 4,800,000
Formula rate plan increase excluding Tax Cuts and Jobs Act Credits										$ 98,000,000
Adjustment to formula rate plan for reduction in MISO cost recovery mechanism																						$ 40,500,000
Bond proceeds loaned by LCDA to LURC under Louisiana Act 55 financing																																														$ 309,000,000
Annual customer credits																																																$ 6,200,000
LCDA issuance of bonds under Louisiana Act 55 financing																																														314,850,000
Amount transfered to restricted escrow account as storm damage reserve																																														16,000,000
Amortization period of cost																																																															27 years
Payments to Acquire Other Property, Plant, and Equipment																																																															$ 0	$ 0	(474,670,000)
Earned return on common equity																			9.95%			9.84%										9.07%																																9.95%
Cap on potential revenue increase for 2018 rate case evaluation period																																																															35,000,000
Requirement for excess transmission project costs eligible for costs recovery mechanism													$ 100,000,000
Earned Return on Common Equity Resulting From Revenue-Neutral Realignments to Other Recovery Mechanisms										8.16%
Earned Return on Common Equity Excluding Realignments										9.88%
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										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
Refund To Customers																									$ 71,000,000
Refund to Customers Credited Through Formula Rate Plan																									68,000,000
Earned return on common equity													10.79%
Proceed from loan by LCDA to corporation LURC																																																																		$ 148,600,000
Income before income taxes																																																															621,003,000	$ 801,645,000	711,781,000
Minimum customer benefits																																																$ 30,800,000
Bond proceeds transfered to company under Louisiana Act 55 financing																																														$ 293,000,000
Regulatory Assets, Noncurrent					1,105,077,000											1,145,842,000																																															1,105,077,000	1,145,842,000
Payments to Acquire Property, Plant, and Equipment																																		475,000,000
Estimated nominal benefit to Customers Anticipated with AMI Deployment																											$ 607,000,000
LPSC staff recommended fuel adjustment clause refund including interest																									$ 3,000,000									8,600,000
Previously Recorded Provision For Refund to Customers Due to Waterford 3 Steam Generator Project Settlement																										48,000,000
Regulatory Charge Due to Waterford 3 Steam Generator Project Settlement																																																										$ 23,000,000
LPSC previously recommended disallowance of portion of refund to customers																													$ 3,400,000
Adjustment to formula rate plan to decrease Legacy Entergy Gulf States Louisiana revenues due to effect of system agreement termination																																$ 58,700,000
Adjustment to formula rate plan for increase in MISO cost recovery mechanism																																11,000,000
Requested Recovery of Previously Deferred Operation and Maintenance Expenses													$ 1,400,000
Regulatory Liability, Noncurrent					748,784,000											761,059,000																																															$ 748,784,000	761,059,000
Book Value of Existing Meters to be Retired with AMI Deployment																																				92,000,000																							92,000,000
Estimated implementation costs for advanced metering infrastructure (AMI)																											330,000,000
Adjustment to formula rate plan to increase Legacy Entergy Louisiana additional capacity mechanism																																14,200,000
Adjustment to formula rate plan to increase Legacy Entergy Louisiana revenues due to effects of system agreement termination																																10,000,000
Adjustment to formula rate plan to increase Legacy Entergy Gulf States Louisiana additional capacity mechanism																																500,000
Rate At Which Electricity Sold To Retail Customers | $ / kWh																																																															0.046
Formula rate plan revenue decrease									$ 17,600,000													$ 16,900,000
Formula rate plan revenue decrease resulting from legacy Entergy Gulf States Louisiana revenue																						9,700,000
Formula rate plan revenue decrease resulting from incremental revenue																						3,700,000
Current MISO formula rate plan cost recovery																																																												$ 46,800,000
Reduced proposed MISO formula rate plan cost recovery																						6,300,000
Reduction in Revenue Requirement										$ 3,500,000
Earnings bandwidth basis points																			16000.00%
Reduced earnings bandwidth basis points													6000.00%						8000.00%
Increase (Decrease) in Regulatory Liabilities																																																															$ (125,185,000)	605,453,000	62,351,000
Monthly regulatory liability established to reflect tax benefits already included in retail rates		$ 9,100,000
Public Utilities, proposed customer credits													$ 700,000
Proposed prospective reduction in the gas infrastructure rider													$ 200,000
Entergy Louisiana [Member] | Hurricane Rita [Member]
Regulatory Assets [Line Items]
Reduction to Louisiana Act 55 financing savings obligation regulatory liability due to Tax Cuts and Jobs Act																22,300,000																																																22,300,000
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]
Regulatory Assets [Line Items]
Reduction to Louisiana Act 55 financing savings obligation regulatory liability due to Tax Cuts and Jobs Act																2,700,000																																																2,700,000
Rate and Regulatory Matters [Abstract]
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]
Rate Increase Included in Formula Rate Plan																															$ 19,400,000
Amortization period of cost																																																															27 years
Earned return on common equity																															10.07%
Increase in expenses to be collected through ad valorem tax adjustment rider																															$ 4,300,000
Authorized Storm Damage Reserve Balance					15,000,000						$ 15,000,000																		15,000,000																																$ 15,000,000		$ 15,000,000
Monthly storm damage provision									0																		0																																				1,750,000
Balance At Which Storm Damage Accrual Will Return To Current Level																				$ 10,000,000																																											10,000,000
Upper limit not exceeded for storm accrual balance																																	$ 10,000,000
Income before income taxes																																																															305,000	183,951,000	173,038,000
Deferred Fuel Cost					8,016,000											32,444,000																																															8,016,000	32,444,000
Public Utilities, Requested Rate Increase (Decrease), Amount																																		$ 32,600,000
Projected Over-Recovery Energy Cost Recovery Rider																											2,000,000								$ 68,000,000		$ 48,000,000
Projected under-recovery Energy Cost Recovery Rider						$ 57,000,000																																																																		$ 61,500,000
Regulatory Assets, Noncurrent					343,049,000											397,909,000																																															343,049,000	397,909,000
Estimated nominal benefit to Customers Anticipated with AMI Deployment																											496,000,000
Public Utilities, Requested Return on Equity, Percentage																																		9.96%
Regulatory Liability, Noncurrent					33,622,000											869,000																																															33,622,000	869,000
Estimated Net benefit to Customers Anticipated with AMI Deployment																											183,000,000
Book Value of Existing Meters to be Retired with AMI Deployment																																				56,000,000																							56,000,000
Public Utilities, Requested Rate Increase (Decrease), Amount																																		$ 32,600,000
Public Utilities, Approved Rate Increase (Decrease), Amount																															23,700,000
Estimated implementation costs for advanced metering infrastructure (AMI)																											132,000,000
Redemption of Preferred Equity						$ 21,200,000
Increase (Decrease) in Regulatory Liabilities																																																															$ (131,856,000)	405,395,000	(2,986,000)
Offset of Unprotected Excess ADIT Against Net Utility Plant Approved in Stipulation											127,200,000																																																		127,200,000
Offset of Unprotected Excess ADIT Against Other Regulatory Assets Approved in Stipulation											2,200,000																																																		2,200,000
Return of excess ADIT through customer bill credits																																																									$ 25,800,000
Return of unprotected excess ADIT through sale of fuel oil inventory																																																									5,800,000
Proposed customer credits due to internal restructuring					27,000,000			$ 27,000,000
Entergy Gulf States Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Power blocks																																												2
Class A preferred membership units sold to third party | shares																																																		500,000
Proceeds From Sale of Preferred Membership Units																																																		$ 51,000,000
Expected Base Purchase Price Union Power Station Power Block																																												$ 237,000,000
LPSC approval of recovery of refund previously made to customers regarding dry cask storage																		$ 5,000,000
Amount of LPSC Recommended Realignment of Fuel Cost Recovery to Base Rates																																		12,700,000
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
Payments to Acquire Other Property, Plant, and Equipment																																																															$ 0	0	(237,335,000)
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 2 Project Costs																																												12,800,000
Financing order authorized to issue storm cost recovery bonds																																										$ 98,700,000
Amount of Hurricane Issac storm cost to be recovered through securitization																																										31,800,000
Replenishment amount for storm reserve spending																																										63,900,000
Amount authorized for storm reserve																																												75,000,000
Income before income taxes																																																															50,716,000	77,831,000	77,554,000
Repayment of long-term payable due to Entergy Louisiana																																																															(2,077,000)	(2,104,000)	(4,973,000)
Hurricane Isaac Storm Restoration Costs Approved as Recoverable from Electric Customers																																												31,700,000
Regulatory Assets, Noncurrent					229,796,000											251,433,000																																															229,796,000	251,433,000
Authorized monthly customer credits																																					400,000
Monthly customer credits																														$ 1,400,000
Up Front Financing Costs On Issuance Of Bonds To Recover Storm Damage Restoration Costs																																										$ 3,000,000
Energy Smart Program Funding																							$ 11,800,000
Allocation of benefits resulting from Tax Cuts and Jobs Act to Energy Smart Programs											13,500,000
Proposed customer credits in current year																																																															10,000,000
Proposed customer credits in first quarter of year after transaction closes																																																															1,400,000
Proposed customer credits per month in second year after transaction closes																																																															117,500
Estimated Net benefit to Customers Anticipated with AMI Deployment																												$ 101,000,000
Book Value of Existing Meters to be Retired with AMI Deployment																																				$ 21,000,000																							21,000,000
Incremental costs related to one year acceleration of implementation of advanced metering infrastructure											$ 4,400,000
Estimated implementation costs for advanced metering infrastructure (AMI)																												75,000,000
Redemption of Preferred Equity																	$ 21,000,000
Call Premium on Preferred Stock																	$ 819,000
Increase (Decrease) in Regulatory Liabilities																																																															(28,459,000)	110,147,000	(3,997,000)
Benefit to electric customers related to reduction in income tax expense under Tax Act														$ 8,200,000
Benefit to gas customers related to reduction in income tax expense under Tax Act														$ 1,300,000
Entergy Texas [Member]
Regulatory Assets [Line Items]
Portion of requested increase in base rates associated with moving costs												$ 48,000,000
Rate and Regulatory Matters [Abstract]
System Agreement Bandwidth Remedy Payments																																						$ 10,900,000			$ 10,900,000
Request filed for refund of fuel cost recovery over collections																30,500,000					$ 30,700,000												41,800,000
Requested increase in retail revenues per request for annual distribution cost recovery factor rider																					$ 19,000,000
Approved Recovery Through Rider Revenues																				8,650,000
Rate reduction							$ 0
Refund To Customers																															$ 68,000,000		56,200,000
Income before income taxes																																																															135,992,000	124,654,000	170,635,000
Public Utilities, Requested Rate Increase (Decrease), Amount					2,700,000							166,000,000																	29,500,000										$ 13,000,000
Regulatory Assets, Noncurrent					598,048,000											661,398,000																																															598,048,000	661,398,000
Reduction in approved retail rate increase																																					2,000,000
Intervenor Recommended Disallowance Due to Load Growth Adjustment																																					$ 3,400,000
System Agreement Bandwidth Refund Related to Calendar Year 2006-2008 Production Costs																																	$ 3,500,000
Jurisdictional eligible fuel and purchased power expenses, net of credits																																																																						$ 1,770,000,000
Estimated deferred fuel over recovery balance for reconciliation period																														19,300,000
Unspecific disallowance associated with settlement agreement																										6,000,000
Projected Over-Recovery Balance																											$ 21,000,000
Public Utilities, Requested Increase in Revenue Requirement												118,000,000
Regulatory Liability, Noncurrent					47,884,000											6,850,000																																															47,884,000	6,850,000
Estimated Net benefit to Customers Anticipated with AMI Deployment																							33,000,000
Book Value of Existing Meters to be Retired with AMI Deployment																										41,000,000																																$ 41,000,000							41,000,000
Public Utilities, Requested Rate Increase (Decrease), Amount					2,700,000							166,000,000																	29,500,000										$ 13,000,000
Public Utilities, Approved Rate Increase (Decrease), Amount							53,200,000																							10,500,000
Authorized collection through TCRF rider																										29,500,000			10,500,000
Estimated implementation costs for advanced metering infrastructure (AMI)																							132,000,000
Increase (Decrease) in Regulatory Liabilities																																																															$ (19,336,000)	410,968,000	2,106,000
Return of excess ADIT through customer bill credits							185,200,000					185,200,000
Net book value of Neches and Sabine 2 plants							24,500,000
Deferred Storm and Property Reserve Deficiency, Noncurrent							20,500,000
Amended annual revenue requirement from distribution cost recovery factor rider																				$ 18,300,000
Refund due customers resulting from lower federal income tax rate							25,000,000					25,000,000
Capitalized skylining tree hazard costs							6,000,000
Refund to customers of protected excess accumulated deferred taxes							242,500,000					242,500,000
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]
Redetermination Of Production Cost Allocation Rider Unrecovered Retail Balance																																1,900,000
Production Cost Allocation Rider Under-recovered Retail Balance Approved for Recovery																						300,000
System Agreement Bandwidth Remedy Payments Approved for Recovery																																$ 1,900,000
Credit resulting from compliance filing pursuant to September 2016 FERC order																						$ 300,000
Incremental Fuel and Replacement Energy Costs																																																	$ 65,900,000
Amortization period of cost																																																															27 years
Payments to Acquire Other Property, Plant, and Equipment																																		(237,000,000)																													$ 0	0	(237,323,000)
Earned return on common equity																																											10.20%
Basis Point Bandwidth																																				50.00%
Rate reduction																																																													$ 0
Payment associated with compliance filing March 2018 FERC order												$ 2,800,000
Rate increase																																				$ 225,000,000							$ 268,400,000
Earned return on common equity																				9.75%																9.75%
Amount Collected From Customers																																																		$ 156,000,000
Income before income taxes																																																															(44,360,000)	233,648,000	274,985,000
Deferred Fuel Cost					19,235,000											63,302,000																																															19,235,000	63,302,000
Public Utilities, Requested Rate Increase (Decrease), Amount																														$ 67,700,000
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
Regulatory Assets, Noncurrent					1,534,977,000											1,567,437,000																																															1,534,977,000	1,567,437,000
Up Front Financing Costs On Issuance Of Bonds To Recover Storm Damage Restoration Costs																																																				$ 4,600,000
Estimated nominal benefit to Customers Anticipated with AMI Deployment																													406,000,000
Reduction in approved retail rate increase																																			$ 5,000,000
Post-Fukushima Compliance Costs																																				7,700,000
Flood Barrier Compliance Costs																																				9,900,000
Interim Base Rate Adjustment Surcharge Recovery																																		21,100,000
Public Utilities, Requested Return on Equity, Percentage																														9.75%
Public Utilities, Requested Increase in Revenue Requirement																										54,400,000		$ 54,400,000
Projected Increase in Revenue Requirement					66,700,000					$ 169,000,000								$ 0		$ 129,700,000
Regulatory Liability, Noncurrent					402,668,000											363,591,000																																															402,668,000	363,591,000
Portion of Approved Revenue Requirement Increase Subject to Possible Future Adjustment and Refund to Customers							$ 45,700,000																			$ 25,000,000
Book Value of Existing Meters to be Retired with AMI Deployment																																				$ 57,000,000																							$ 57,000,000
Public Utilities, Requested Rate Increase (Decrease), Amount																														$ 67,700,000
Estimated implementation costs for advanced metering infrastructure (AMI)																													$ 208,000,000
Redemption of Preferred Equity																																																															32,700,000
ALJ Recommended Percentage By Which Payments Be Reduced																																	20.00%
Liability Recorded Related to Estimated Payments Due Utility Operating Companies																35,000,000																		87,000,000																														35,000,000						87,000,000
Regulatory Asset Recorded to Represent Estimate of Recoverable Retail Portion of Costs																31,000,000																		75,000,000																														31,000,000						$ 75,000,000
Rate At Which Electricity Sold To Retail Customers | $ / kWh														0.01547										0.01164
Increase in Rate At Which Electricity Sold To Retail Customers | $ / kWh														0.01882										0.01547
Increase (Decrease) in Regulatory Liabilities																																																															$ (341,682,000)	1,043,507,000	62,994,000
Tax benefits to customers resulting from tax adjustment rider															$ 467,000,000
Annual revenue constraint per rate class percentage										4.00%								400.00%		400.00%
Reduced proposed increase in revenue requirement to comply with annual revenue constraint										$ 65,400,000						71,100,000		$ 71,100,000		$ 70,900,000
Projected Revenue Deficiency										$ 95,600,000
Proposed customer credits due to internal restructuring									$ 39,600,000
System Energy [Member]
Rate and Regulatory Matters [Abstract]
Earned return on common equity																																																															10.94%
Payments from utility operating companies as percentage of average production cost																																																								11.00%
Income before income taxes																																																															$ 46,434,000	148,565,000	167,805,000
Percent Interest in Grand Gulf												11.50%																																																			90.00%
Reduction of previously recorded deprecation expense																																																									$ 26,000,000
Regulatory Assets, Noncurrent					446,371,000											444,327,000																																															$ 446,371,000	444,327,000
Regulatory Liability, Noncurrent					381,887,000											455,991,000																																															381,887,000	455,991,000
Increase (Decrease) in Regulatory Liabilities																																																															(156,802,000)	331,251,000	$ 33,438,000
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
Minimum [Member] | System Energy [Member]
Rate and Regulatory Matters [Abstract]
Recommended adjustment to earned return on equity																									8.37%
Maximum [Member] | System Energy [Member]
Rate and Regulatory Matters [Abstract]
Recommended adjustment to earned return on equity																									8.67%
Gas [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Earned return on common equity		9.06%																							6.37%
Public Utilities, Requested Increase in Revenue Requirement		$ 100,000																					$ 1,200,000
Attorney General Litigation Costs [Member] | Entergy Mississippi [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Assets, Noncurrent	[1]				23,600,000											9,300,000																																															23,600,000	9,300,000
Opportunity Sales [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Assets, Noncurrent					116,300,000											109,800,000																																															116,300,000	109,800,000
Opportunity Sales [Member] | Entergy Arkansas [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Assets, Noncurrent					116,300,000											109,800,000																																															116,300,000	109,800,000
Nuclear Generation Development Costs [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Assets, Noncurrent	[1]				29,000,000											36,400,000																																															29,000,000	36,400,000
Nuclear Generation Development Costs [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets					28,500,000																																																										28,500,000
Regulatory Assets, Noncurrent	[1]				28,500,000											35,800,000																																															28,500,000	35,800,000
Asset Retirement Obligation Costs [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Assets, Noncurrent	[2]				814,300,000											746,000,000																																															814,300,000	746,000,000
Asset Retirement Obligation Costs [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Assets, Noncurrent	[2]				232,900,000											218,600,000																																															232,900,000	218,600,000
Asset Retirement Obligation Costs [Member] | Entergy Mississippi [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Assets, Noncurrent	[2]				7,200,000											7,600,000																																															7,200,000	7,600,000
Asset Retirement Obligation Costs [Member] | Entergy New Orleans [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Assets, Noncurrent	[2]				4,500,000											4,300,000																																															4,500,000	4,300,000
Asset Retirement Obligation Costs [Member] | Entergy Arkansas [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Assets, Noncurrent	[2]				381,700,000											345,200,000																																															381,700,000	345,200,000
Asset Retirement Obligation Costs [Member] | System Energy [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Assets, Noncurrent	[2]				186,900,000											169,100,000																																															186,900,000	169,100,000
Subsequent Event [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Earned return on common equity																																																																				9.80%
Cap on potential revenue increase for 2018 and 2019 rate case evaluation periods																																																																				$ 70,000,000
Rate increase				$ 2,800,000
Earned return on common equity				2.69%
Refund to customers related to claim of vendor fault in servicing nuclear plant for Entergy Gulf States Louisiana business				$ 900,000
Refund to customers related to claim of vendor fault in servicing nuclear plant				$ 7,300,000
Subsequent Event [Member] | Entergy Mississippi [Member]
Rate and Regulatory Matters [Abstract]
MPSC approved customer credits due to internal restructuring																																																																							$ 4,500,000
Subsequent Event [Member] | Entergy New Orleans [Member]
Rate and Regulatory Matters [Abstract]
Annual customer credits																																																																					$ 5,000,000
New Orleans City Council Recommended Rate Reduction - Electric			$ 33,000,000
New Orleans City Council Recommended Rate Reduction - Gas			3,800,000
Intervenor Recommended Rate Reduction - Electric			49,000,000
Intervenor Recommended Rate Reduction - Gas			$ 5,000,000
Subsequent Event [Member] | Entergy Arkansas [Member]
Rate and Regulatory Matters [Abstract]
Projected Revenue Deficiency																																																														$ 73,400,000
Vidalia Purchased Power Agreement [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Liability, Noncurrent	[3]				139,700,000											151,600,000																																															139,700,000	151,600,000
Increase (Decrease) in Regulatory Liabilities																(30,500,000)
Vidalia Purchased Power Agreement [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Liability, Noncurrent	[3]				139,700,000											151,600,000																																															139,700,000	151,600,000
Louisiana Act 55 Financing Obligation [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Liability, Noncurrent	[3]				111,100,000											124,800,000																																															111,100,000	124,800,000
Increase (Decrease) in Regulatory Liabilities																(25,000,000)
Louisiana Act 55 Financing Obligation [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Liability, Noncurrent	[3]				111,100,000											124,800,000																																															111,100,000	124,800,000
Revenue Subject to Refund [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Liability, Noncurrent					44,400,000											0																																															44,400,000	0
Revenue Subject to Refund [Member] | Entergy Mississippi [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Liability, Noncurrent					9,300,000											0																																															9,300,000	0
Revenue Subject to Refund [Member] | Entergy Arkansas [Member]
Rate and Regulatory Matters [Abstract]
Regulatory Liability, Noncurrent					$ 35,100,000											$ 0																																															$ 35,100,000	$ 0
Union Power Station [Member]
Rate and Regulatory Matters [Abstract]
Payments to Acquire Property, Plant, and Equipment																																		949,000,000
Union Power Station [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Payments to Acquire Property, Plant, and Equipment																																		474,670,000
Union Power Station [Member] | Entergy New Orleans [Member]
Rate and Regulatory Matters [Abstract]
Expected Base Purchase Price Union Power Station Power Block																																								$ 237,000,000
Payments to Acquire Property, Plant, and Equipment																																		237,335,000
Union Power Station [Member] | Entergy Arkansas [Member]
Rate and Regulatory Matters [Abstract]
Payments to Acquire Property, Plant, and Equipment																																		$ 237,323,000
Electricity [Member] | Entergy New Orleans [Member]
Rate and Regulatory Matters [Abstract]
Revised Increase In Rate Base Request								$ 135,200,000
Public Utilities, Requested Return on Equity, Percentage								10.50%
Proposed rate reduction in revised filing								$ 20,300,000
Return on equity including performance adder provision								10.75%
Portion of base rate increase associated with moving costs from rider into rates								$ 131,500,000
Proposed surcharge to recover advanced metering infrastructure costs								7,100,000
Rate reduction due to decrease in projected fuel and energy efficiency riders								$ 31,100,000
Natural Gas [Member] | Entergy New Orleans [Member]
Rate and Regulatory Matters [Abstract]
Public Utilities, Requested Return on Equity, Percentage								10.75%
Proposed rate reduction in revised filing								$ 142,000

[1] (b)Does not earn a return on investment.

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

[3] (b)As a result of the enactment of the Tax Cuts and Jobs Act, in December 2017, and the lowering of the federal corporate income tax rate from 35% to 21% effective January 2018, the Vidalia purchased power agreement regulatory liability was reduced by $30.5 million and the Louisiana Act 55 financing savings obligation regulatory liabilities were reduced by $25.0 million, with corresponding increases to Other regulatory credits on the income statement. The effects of the Tax Cuts and Jobs Act are discussed further in Note 3 to the financial statements.