Rate And Regulatory Matters (Narrative) (Details)			1 Months Ended																																																			3 Months Ended			9 Months Ended	11 Months Ended	12 Months Ended					36 Months Ended
	Jan. 01, 2018 USD ($)	Sep. 01, 2015 USD ($)	Mar. 31, 2018 USD ($)	Feb. 28, 2018 USD ($)	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 ($)	Jan. 31, 2016	Dec. 31, 2015 USD ($)	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 ($)	Jun. 30, 2014 USD ($)	May 31, 2014 USD ($)	Jan. 31, 2014 USD ($)	Aug. 30, 2013	Jan. 31, 2013 USD ($)	Nov. 30, 2012	Sep. 30, 2012 USD ($)	Apr. 30, 2012 USD ($)	Feb. 29, 2012 USD ($) shares	Nov. 30, 2011 USD ($)	Jul. 31, 2010 USD ($) $ / unit shares	Jun. 30, 2010 USD ($)	Aug. 31, 2008 USD ($) $ / unit shares	Jul. 31, 2008 USD ($) shares	Apr. 30, 2007 USD ($)	Jun. 30, 2005	Feb. 28, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2017 USD ($) $ / kWh	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2008 USD ($)	Dec. 31, 2020 USD ($)	Mar. 31, 2016 USD ($)	Nov. 01, 2017 USD ($)	Apr. 30, 2014 USD ($)	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																																																											$ 357,251,000	$ 2,835,637,000	$ 2,104,906,000
Payments to Acquire Other Property, Plant, and Equipment																																																											(16,762,000)	(949,329,000)	0
Asset Write-Offs, Impairments, And Related Charges																																																											538,372,000	2,835,637,000	2,104,906,000
Operation and maintenance expense																																																											3,423,689,000	3,296,711,000	3,354,981,000
Income before income taxes																																																											967,923,000	(1,381,762,000)	(799,661,000)
Deferred Fuel Cost					$ 95,746,000										$ 108,465,000																																								$ 108,465,000				95,746,000	108,465,000
Increase (Decrease) in Regulatory Liabilities																																																											$ 2,915,795,000	158,031,000	61,241,000
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]
Decrease in estimated costs at completion for Ninemile 6 project																															$ 76,000,000
Rate Increase Included in Formula Rate Plan																													$ 35,700,000
Adjustment to formula rate plan for reduction in MISO cost recovery mechanism											$ 40,500,000																		$ 5,500,000
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	(474,670,000)	0
Earned return on common equity								9.95%			9.84%										9.07%								9.09%
Adjustment to formula rate plan to decrease additional capacity mechanism																													$ 17,800,000
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
Estimated Revenue Requirement Implemented for Ninemile 6																																			51,100,000
Estimated costs at completion for Ninemile 6 project																															648,000,000
Refund To Customers														$ 71,000,000
Refund to Customers Credited Through Formula Rate Plan														68,000,000
Proceed from loan by LCDA to corporation LURC																																																														$ 148,600,000
Operation and maintenance expense																																																											969,400,000	923,779,000	997,546,000
Income before income taxes																																																											$ 801,645,000	711,781,000	625,310,000
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
Rate Increase Included in Legacy Formula Rate Plan																															10,000,000
Deferred External Costs Associated with Business Combination																																																													16,000,000
Minimum customer benefits																																						$ 30,800,000
Bond proceeds transfered to company under Louisiana Act 55 financing																																				293,000,000
Payments to Acquire Property, Plant, and Equipment																							474,000,000
Customer Benefits Anticipated with Business Combination Per Stipulated Settlement with LPSC																															107,000,000
Upper Limit on Rates																															30,000,000
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
Book Value of Existing Meters to be Retired with AMI Deployment																										92,000,000																														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											$ 16,900,000
Formula rate plan revenue decrease resulting from legacy Entergy Louisiana revenue											3,500,000
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
Earnings bandwidth basis points								16000.00%
Reduced earnings bandwidth basis points								8000.00%
Increase (Decrease) in Regulatory Liabilities																																																											$ 605,453,000	62,351,000	96,234,000
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
Increase in Annual Funding for Storm Reserve																																																											$ 1,750,000.00
Authorized Storm Damage Reserve Balance					15,000,000													15,000,000																																									15,000,000
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
Storm Reserve Accrual Hurricane Isaac																0
Operation and maintenance expense																																																											243,480,000	250,443,000	261,255,000
Income before income taxes																																																											183,951,000	173,038,000	154,580,000
Deferred Fuel Cost					32,444,000										6,957,000																																								6,957,000				32,444,000	6,957,000
Public Utilities, Requested Rate Increase (Decrease), Amount																							$ 32,600,000
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
Projected Over-Recovery Energy Cost Recovery Rider																2,000,000								$ 68,000,000			$ 48,000,000
Projected under-recovery Energy Cost Recovery Rider																																																																		$ 61,500,000
Estimated nominal benefit to Customers Anticipated with AMI Deployment																496,000,000
Public Utilities, Requested Return on Equity, Percentage																							9.96%
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					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
Increase (Decrease) in Regulatory Liabilities																																																											$ 405,395,000	(2,986,000)	9,172,000
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
Estimated Revenue Requirement Implemented for Ninemile 6																																			$ 26,800,000
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	(237,335,000)	0
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
Operation and maintenance expense																																																											109,270,000	117,471,000	119,087,000
Income before income taxes																																																											77,831,000	77,554,000	70,115,000
Deferred Fuel Cost					0										4,818,000																																								4,818,000				0	4,818,000
Purchase price of net assets that support Algiers customers		$ 85,000,000
Repayment of long-term payable due to Entergy Louisiana		(59,600,000)																																																									(2,104,000)	(4,973,000)	(59,610,000)
Payable due Entergy Louisiana		25,500,000
Hurricane Isaac Storm Restoration Costs Approved as Recoverable from Electric Customers																																		31,700,000
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
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
Maximum average fuel adjustment charge billed to customers																																																						$ 0.035
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					21,000,000
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																																																											110,147,000	(3,997,000)	(7,359,000)
Entergy Texas [Member]
Rate and Regulatory Matters [Abstract]
Under-recovered fuel balance																																																																			$ 8,700,000
System Agreement Bandwidth Remedy Payments																												$ 10,900,000			$ 10,900,000					15,300,000
Request filed for refund of fuel cost recovery over collections					30,500,000					$ 30,700,000												41,800,000														$ 24,600,000
Earned return on common equity																																											10.60%		9.60%
Requested increase in retail revenues per request for annual distribution cost recovery factor rider		$ 6,500,000								$ 19,000,000																			10,100,000
Rate increase																																												$ 28,000,000
Increase In Base Rate Reflecting Return On Common Equity																																															$ 112,000,000
Asset Write-Offs, Impairments, And Related Charges																																																											0	0	23,472,000
After-Tax Asset Impairment Charge																																																													15,300,000
Refund To Customers																				$ 68,000,000		56,200,000
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
Operation and maintenance expense																																																											230,616,000	220,566,000	254,731,000
Income before income taxes																																																											124,654,000	170,635,000	106,875,000
Public Utilities, Requested Rate Increase (Decrease), Amount																		29,500,000											13,000,000
System Agreement Bandwidth Remedy Receipts																																							$ 48,600,000
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
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																		29,500,000											13,000,000
Public Utilities, Approved Rate Increase (Decrease), Amount																			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																																																											$ 410,968,000	2,106,000	1,271,000
Amended annual revenue requirement from distribution cost recovery factor rider									$ 18,300,000																		$ 8,650,000
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																		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											300,000																							3,000,000
System Agreement Bandwidth Remedy Payments Approved for Recovery																					$ 1,900,000													67,800,000
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																																																											$ 0	(237,323,000)	0
Earned return on common equity																										9.75%							10.20%
Basis Point Bandwidth																										50.00%
Rate increase																										$ 225,000,000							$ 268,400,000
Earned return on common equity									9.75%
Amount Collected From Customers																																														$ 156,000,000
Reduction In Amount Of Damages That Should Be Paid By Entergy Arkansas To Utility Operating Companies																																									20.00%
Operation and maintenance expense																																																											707,825,000	706,573,000	734,118,000
Income before income taxes																																																											233,648,000	274,985,000	114,813,000
Deferred Fuel Cost					63,302,000										96,690,000																																								$ 96,690,000				63,302,000	96,690,000
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
APSC and Intervener Recommended Revenue Requirement																													$ 217,900,000
APSC and Intervener Recommended Return on Equity																													9.65%
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							$ 0		$ 129,700,000
Portion of Approved Revenue Requirement Increase Subject to Possible Future Adjustment and Refund to Customers															$ 25,000,000
Book Value of Existing Meters to be Retired with AMI Deployment																										$ 57,000,000																														$ 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%
Payments due Utility Operating Companies Related to Opportunity Sales Proceedings									$ 86,000,000
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													0.01164
Increase in Rate At Which Electricity Sold To Retail Customers | $ / kWh													0.01547
Increase (Decrease) in Regulatory Liabilities																																																											$ 1,043,507,000	62,994,000	(11,123,000)
Annual revenue constraint per rate class percentage							400.00%		400.00%
Reduced proposed increase in revenue requirement to comply with annual revenue constraint					71,100,000		$ 71,100,000		$ 70,900,000
Proposed customer credits due to internal restructuring						$ 66,000,000
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%
Operation and maintenance expense																																																											$ 213,534,000	153,064,000	156,552,000
Income before income taxes																																																											148,565,000	167,805,000	164,395,000
Increase (Decrease) in Regulatory Liabilities																																																											331,251,000	$ 33,438,000	$ (33,686,000)
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														6.37%											10.22%
Recommended recovery of previously deferred operation and maintenance expenses											900,000
Public Utilities, Requested Increase in Revenue Requirement												$ 1,200,000		$ 1,400,000
Requested Recovery of Previously Deferred Operation and Maintenance Expenses											$ 1,400,000			$ 1,500,000
Gas [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%
Range of Adherence to a Specified Spending Plan																																		20.00%
Actual Versus Planned Rider Spending Variance																																		10.00%
Rate increase																																		$ 706,000
Authorized return on common equity																																		7.20%
Recommended adjustment to earned return on equity																																	7.24%
Net increase in revenues per joint stipulation entered into with MPSC																																	$ 688,000
Nuclear Generation Development Costs [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Other Regulatory Assets					35,800,000																																																						$ 35,800,000
Subsequent Event [Member]
Regulatory Assets [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
Subsequent Event [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Maximum average fuel adjustment charge billed to customers			$ 0.03060
Subsequent Event [Member] | Entergy New Orleans [Member]
Rate and Regulatory Matters [Abstract]
Annual customer credits																																																																$ 5,000,000
Maximum average fuel adjustment charge billed to customers			0.035323
Subsequent Event [Member] | Entergy Arkansas [Member]
Rate and Regulatory Matters [Abstract]
Rate reduction																																																										$ 0
Proposed customer credits due to internal restructuring				$ 39,600,000
Subsequent Event [Member] | Entergy New Orleans Algiers Customers [Member]
Rate and Regulatory Matters [Abstract]
Maximum average fuel adjustment charge billed to customers			0.025446
Subsequent Event [Member] | Gas [Member] | Entergy Louisiana [Member]
Rate and Regulatory Matters [Abstract]
Earned return on common equity	9.06%
Public Utilities, Requested Increase in Revenue Requirement	$ 100,000
Subsequent Event [Member] | Electric Transmission [Member] | Entergy New Orleans [Member]
Rate and Regulatory Matters [Abstract]
Maximum average fuel adjustment charge billed to customers			$ 0.034609
Vidalia Purchased Power Agreement [Member]
Rate and Regulatory Matters [Abstract]
Increase (Decrease) in Regulatory Liabilities					(30,500,000)
Louisiana Act 55 Financing Obligation [Member]
Rate and Regulatory Matters [Abstract]
Increase (Decrease) in Regulatory Liabilities					$ (25,000,000)
Union Power Station [Member]
Rate and Regulatory Matters [Abstract]
Payments to Acquire Property, Plant, and Equipment																							0
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