Rate And Regulatory Matters (Narrative) (Details)				1 Months Ended																																																											3 Months Ended					9 Months Ended		12 Months Ended					15 Months Ended		24 Months Ended	36 Months Ended				72 Months Ended
		Jul. 31, 2019 USD ($)	Jan. 01, 2018 USD ($)	Feb. 29, 2020 USD ($)	Jan. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Nov. 30, 2019 USD ($)	Oct. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Aug. 31, 2019 USD ($)	Jul. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	May 31, 2019 USD ($)	Apr. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) $ / kWh	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 ($)	Oct. 31, 2017 USD ($)	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 ($)	Apr. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Oct. 31, 2015 USD ($)	Jul. 31, 2015 USD ($)	May 31, 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 ($)	Feb. 29, 2012 USD ($)	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, 2019 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) $ / kWh	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2008 USD ($)	Jul. 27, 2019	Apr. 23, 2018	Dec. 31, 2019 USD ($)	Dec. 31, 2021	Dec. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2024 USD ($)	Sep. 30, 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%	35.00%
Asset Write-Offs, Impairments, And Related Charges																																																																							$ 226,678,000	$ 491,739,000	$ 357,251,000
Payments to Acquire Other Property, Plant, and Equipment																																																																							(305,472,000)	(26,623,000)	(16,762,000)
After-Tax Asset Impairment Charge																																																																$ 4,200,000
Income before income taxes																																																																							1,088,419,000	(174,271,000)	967,923,000
Deferred Fuel Cost						$ 0												$ 27,251,000																																																					0	27,251,000					$ 0
Regulatory Assets, Noncurrent						5,292,055,000												4,746,496,000																																																					5,292,055,000	4,746,496,000					5,292,055,000
Regulatory Liability, Noncurrent						1,961,005,000												1,620,254,000																																																					1,961,005,000	1,620,254,000					$ 1,961,005,000
Increase (Decrease) in Regulatory Liabilities																																																																							$ (14,781,000)	$ (803,323,000)	2,915,795,000
Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Property, Plant and Equipment, Useful Life																																																																							15 years
Period over which advanced meters will be deployed																																																																							3 years
Portion of Waterford 3 purchase price satisfied through issuance of debt																																													$ 52,000,000
Rate Increase Included in Formula Rate Plan													$ 109,500,000										$ 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
Earned return on common equity																																		9.84%																																						9.95%					9.80%
Cap on potential revenue increase for 2018 rate case evaluation period																																																																							$ 35,000,000
Cap on potential revenue increase for 2018 and 2019 rate case evaluation periods																																																																													$ 70,000,000
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%																																														10.61%
Income before income taxes																																																																							813,160,000	$ 621,003,000	801,645,000
Minimum customer benefits																																																						$ 30,800,000
Bond proceeds transfered to company under Louisiana Act 55 financing																																																				$ 293,000,000
Regulatory Assets, Noncurrent						1,315,211,000												1,105,077,000																																																					1,315,211,000	1,105,077,000					1,315,211,000
LPSC staff recommended fuel adjustment clause refund including interest																																					$ 3,000,000
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							$ 2,300,000			$ 4,300,000							7,300,000
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
Requested Recovery of Previously Deferred Operation and Maintenance Expenses																										$ 1,400,000
Regulatory Liability, Noncurrent						794,140,000												748,784,000																																																					$ 794,140,000	748,784,000					794,140,000
Public Utilities, Requested Rate Increase (Decrease), Amount													118,700,000
Estimated implementation costs for advanced metering infrastructure (AMI)																																							$ 330,000,000
Rate At Which Electricity Sold To Retail Customers | $ / kWh																																																																							0.046
Formula rate plan revenue decrease																						$ 17,600,000												$ 16,900,000																																						8,900,000
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
Reduced earnings bandwidth basis points																										6000.00%
Increase (Decrease) in Regulatory Liabilities																																																																							$ (35,881,000)	(125,185,000)	605,453,000
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
Additional Requested Offset to Return of Unprotected Excess ADIT From Previously Deferred Operation and Maintenance Expenses								$ 700,000
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
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
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																																																									$ 713,000,000.0
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]
Regulatory Assets [Line Items]
Property, Plant and Equipment, Useful Life																																																																							15 years
Period over which advanced meters will be deployed																																																																							3 years
Public Utilities, Approved Return on Equity, Percentage																																																																				6.93%			6.94%	7.13%
Amortization period of cost																																																																							27 years
Earned return on common equity																																																																								7.81%
Authorized Storm Damage Reserve Balance						15,000,000																		$ 15,000,000																																															$ 15,000,000						15,000,000
Monthly storm damage provision																						0																																																	1,750,000
Balance At Which Storm Damage Accrual Will Return To Current Level													$ 10,000,000																			$ 10,000,000																																							10,000,000
Income before income taxes																																																																							150,791,000	$ 305,000	183,951,000
Deferred Fuel Cost						0												8,016,000																																																					0	8,016,000					0
Projected under-recovery Energy Cost Recovery Rider																					$ 57,000,000																																												$ 57,000,000				$ 57,000,000														$ 61,500,000
Projected Over-Recovery Energy Cost Recovery Rider									$ 39,600,000																																																						$ 39,600,000					$ 39,600,000
Regulatory Assets, Noncurrent						377,972,000												343,049,000																																																					377,972,000	343,049,000					377,972,000
Regulatory Liability, Noncurrent						21,512,000												33,622,000																																																					21,512,000	33,622,000					21,512,000
Public Utilities, Requested Rate Increase (Decrease), Amount																																																																							36,800,000	10,100,000
Public Utilities, Approved Rate Increase (Decrease), Amount																																																																							32,800,000	11,000,000
Estimated implementation costs for advanced metering infrastructure (AMI)																																							132,000,000
Redemption of Preferred Equity																			$ 21,200,000
Increase (Decrease) in Regulatory Liabilities																																																																							$ (21,524,000)	(131,856,000)	405,395,000
Offset of Unprotected Excess ADIT Against Net Utility Plant Approved in Stipulation																								127,200,000
Offset of Unprotected Excess ADIT Against Other Regulatory Assets Approved in Stipulation																								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] | Hurricane Rita [Member]
Regulatory Assets [Line Items]
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]
Regulatory Assets [Line Items]
Property, Plant and Equipment, Useful Life																																																																							15 years
Regulatory Asset, Amortization Period																																																																							12 years
Amortization period of cost																																																																							27 years
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																																																																							$ 52,815,000	50,716,000	77,831,000
Repayment of long-term payable due to Entergy Louisiana																																																																							(1,979,000)	(2,077,000)	(2,104,000)
Approved Total Hurricane Isaac Storm Restoration Costs																																																		49,300,000
Hurricane Isaac Storm Restoration Costs Approved as Recoverable from Electric Customers																																																		$ 31,700,000
Regulatory Assets, Noncurrent						259,363,000												229,796,000																																																					259,363,000	229,796,000					259,363,000
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
Incremental costs related to one year acceleration of implementation of advanced metering infrastructure																								$ 4,400,000
Public Utilities, Requested Rate Increase (Decrease), Amount						45,000,000		39,000,000
Provision for Rate Refund						10,000,000																																																																	10,000,000						10,000,000
Regulatory Assets for Rate Case Costs and Algiers Customer Migration Costs						12,000,000																																																																	12,000,000						12,000,000
Regulatory Assets for Retired General Plant Costs						10,000,000																																																																	10,000,000						10,000,000
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																																																																							$ (22,105,000)	(28,459,000)	110,147,000
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
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
Entergy Texas [Member]
Regulatory Assets [Line Items]
Property, Plant and Equipment, Useful Life																																																																							7 years
Period over which advanced meters will be deployed																																																																							3 years
Portion of requested increase in base rates associated with moving costs																									$ 48,000,000
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																																																																							$ 105,501,000	135,992,000	124,654,000
Regulatory Assets, Noncurrent						512,648,000												598,048,000																																																					512,648,000	598,048,000					512,648,000
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																																																																																$ 1,600,000,000	$ 1,770,000,000
Estimated deferred fuel under recovery balance for reconciliation period									$ 25,800,000
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						42,085,000												47,884,000																																																					42,085,000	47,884,000					42,085,000
Public Utilities, Requested Rate Increase (Decrease), Amount																		2,700,000							166,000,000																$ 29,500,000
Public Utilities, Approved Rate Increase (Decrease), Amount																				53,200,000
Authorized collection through TCRF rider																																						$ 29,500,000
Estimated implementation costs for advanced metering infrastructure (AMI)																																			132,000,000
Increase (Decrease) in Regulatory Liabilities																																																																							$ (105,517,000)	(19,336,000)	410,968,000
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
Requested recovery of internal and external litigation expenses previously paid or incurred																	7,200,000
Recommended disallowance of requested recovery of expenses previously paid or incurred								1,400,000
Entergy Texas [Member] | Hurricane Rita [Member]
Regulatory Assets [Line Items]
Financing order authorized to issue storm cost recovery bonds																																																													$ 353,000,000
Entergy Arkansas [Member]
Regulatory Assets [Line Items]
Property, Plant and Equipment, Useful Life																																																																							15 years
Period over which advanced meters will be deployed																																																																							3 years
Regulatory Asset, Amortization Period																																																																							15 years
Incremental Fuel and Replacement Energy Costs																																																							$ 65,900,000
Amortization period of cost																																																																							27 years
Refund to Customers Credited Through Formula Rate Plan																																																																								46,600,000
Earned return on common equity																																9.75%
Amount Collected From Customers																																																								$ 156,000,000
Income before income taxes																																																																							$ 216,195,000	(44,360,000)	233,648,000
Deferred Fuel Cost						0												19,235,000																																																					0	19,235,000					0
Regulatory Assets, Noncurrent						1,666,850,000												1,534,977,000																																																					1,666,850,000	1,534,977,000					1,666,850,000
Up Front Financing Costs On Issuance Of Bonds To Recover Storm Damage Restoration Costs																																																										$ 4,600,000
Public Utilities, Requested Return on Equity, Percentage		9.75%
Proposed rate reduction in revised filing								10,100,000
Regulatory asset related to scrubber costs incurred at White Bluff plant		$ 11,200,000									$ 11,200,000
Projected Increase in Revenue Requirement																		66,700,000					$ 169,000,000								$ 126,200,000	$ 129,700,000
Regulatory Liability, Noncurrent						559,555,000												402,668,000																																																					559,555,000	402,668,000					559,555,000
Portion of Approved Revenue Requirement Increase Subject to Possible Future Adjustment and Refund to Customers																				$ 45,700,000
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 15,300,000						14,000,000
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															0.01882												0.01547									0.01164
Increase in Rate At Which Electricity Sold To Retail Customers | $ / kWh															0.01462												0.01882									0.01547
Increase (Decrease) in Regulatory Liabilities																																																																							39,293,000	(341,682,000)	1,043,507,000
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																																																$ 73,400,000
Proposed customer credits due to internal restructuring																						$ 39,600,000
System Energy [Member]
Regulatory Assets [Line Items]
Earned return on common equity																																																																							10.94%
Payments from utility operating companies as percentage of average production cost																																																														11.00%
Income before income taxes																																																																							$ 114,469,000	46,434,000	148,565,000
LPSC requested authorized return on equity for System Energy in return on equity proceeding																																																																											7.97%	7.81%
APSC/MPSC requested authorized return on equity for System Energy in return on equity proceeding																																																																											8.41%	8.24%
Percent Interest in Grand Gulf																																																																							90.00%
Annual renewal lease payments on Grand Gulf Sale-Leaseback																																																																17,200,000
LPSC requested rate reduction for ADIT associated with uncertain tax positions resulting from Grand Gulf sale-leaseback								512,000,000										334,500,000																																																						334,500,000
LPSC requested refund of cost of capital additions resulting from Grand Gulf sale-leaseback															$ 274,800,000																																																	274,800,000																274,800,000
Reduction of previously recorded deprecation expense																																																															$ 26,000,000
Regulatory Assets, Noncurrent						490,083,000												446,371,000																																																					$ 490,083,000	446,371,000					490,083,000
FERC requested authorized return on equity for System Energy in return on equity proceeding																																																																												9.89%
Regulatory Liability, Noncurrent						533,415,000												381,887,000																																																					533,415,000	381,887,000					533,415,000
Increase (Decrease) in Regulatory Liabilities																																																																							130,949,000	(156,802,000)	$ 331,251,000
Public utilities requested return on equity percentage, median 2nd refund period																																																																											9.65%
Public utilities requested return on equity percentage, midpoint 2nd refund period																																																																											9.74%
Modified public utilities requested return on equity percentage based on benchmarks, median 2nd refund period																																																																											9.91%
Modified public utilities requested return on equity percentage based on benchmarks, midpoint 2nd refund period																																																																											10.30%
APSC/MPSC revised argued authorized return on equity for System Energy in return on equity proceeding																																																																											8.32%	8.26%
FERC requested authorized return on equity for System Energy in return on equity proceeding, rebuttal																																																																											9.63%	9.40%
Ratepayer savings due to Grand Gulf sale-leaseback initial and renewal terms												$ 850,000,000
FERC requested rate reduction for ADIT associated with uncertain tax positions resulting from Grand Gulf sale-leaseback								$ 511,000,000		602,000,000
FERC staff argued over-recovery in depreciation expense for capital additions										$ 32,000,000
Entergy Holdings Company LLC [Member]
Regulatory Assets [Line Items]
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] | Entergy Texas [Member]
Regulatory Assets [Line Items]
Recommended disallowance of requested recovery of expenses previously paid or incurred														$ 3,200,000
Minimum [Member] | System Energy [Member]
Regulatory Assets [Line Items]
Recommended adjustment to earned return on equity																																					8.37%
Public Utilities, Requested Return on Equity, Percentage																																																																											10.32%	10.10%
Maximum [Member] | Entergy New Orleans [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Return on Equity, Percentage								9.35%
Public Utilities, Approved Equity Capital Structure, Percentage								50.00%
Maximum [Member] | Entergy Texas [Member]
Regulatory Assets [Line Items]
Recommended disallowance of requested recovery of expenses previously paid or incurred														$ 4,200,000
Maximum [Member] | System Energy [Member]
Regulatory Assets [Line Items]
Recommended adjustment to earned return on equity																																					8.67%
Public Utilities, Requested Return on Equity, Percentage																																																																											10.69%	10.70%
Percent Equity in Proposed Common Equity Ratio										37.00%
Percent Debt in Proposed Common Equity Ratio										63.00%
LPSC Argued Equity Capital Structure, Percentage										49.00%
APSC and MPSC Argued Equity Capital Structure, Percentage										35.98%
APSC and MPSC Alternative Argued Equity Capital Structure, Percentage										46.75%
FERC Percent Equity in Proposed Common Equity Ratio									46.74%
FERC Percent Debt in Proposed Common Equity Ratio									53.26%
Gas [Member] | Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Earned return on common equity			9.06%																																		6.37%
Public Utilities, Requested Increase in Revenue Requirement			$ 100,000																																$ 1,200,000
Natural Gas [Member] | Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Rate increase																	$ 2,800,000
Earned return on common equity																	2.69%
Attorney General Litigation Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Noncurrent	[1]					29,500,000												23,600,000																																																					29,500,000	23,600,000					29,500,000
Attorney General Litigation Costs [Member] | Entergy Mississippi [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Noncurrent	[1]					29,500,000												23,600,000																																																					29,500,000	23,600,000					29,500,000
Opportunity Sales [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Noncurrent	[1]					116,300,000												116,300,000																																																					116,300,000	116,300,000					116,300,000
Opportunity Sales [Member] | Entergy Arkansas [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Noncurrent	[1]					116,300,000												116,300,000																																																					116,300,000	116,300,000					116,300,000
Nuclear Generation Development Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Noncurrent	[1]					21,600,000												29,000,000.0																																																					21,600,000	29,000,000.0					21,600,000
Nuclear Generation Development Costs [Member] | Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Other Regulatory Assets						21,200,000																																																																	21,200,000						21,200,000
Regulatory Assets, Noncurrent	[1]					21,200,000												28,500,000																																																					21,200,000	28,500,000					21,200,000
Asset Retirement Obligation Costs [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Noncurrent	[2]					920,400,000												814,300,000																																																					920,400,000	814,300,000					920,400,000
Asset Retirement Obligation Costs [Member] | Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Noncurrent	[2]					262,500,000												232,900,000																																																					262,500,000	232,900,000					262,500,000
Asset Retirement Obligation Costs [Member] | Entergy Mississippi [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Noncurrent	[2]					7,800,000												7,200,000																																																					7,800,000	7,200,000					7,800,000
Asset Retirement Obligation Costs [Member] | Entergy New Orleans [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Noncurrent	[2]					4,900,000												4,500,000																																																					4,900,000	4,500,000					4,900,000
Asset Retirement Obligation Costs [Member] | Entergy Arkansas [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Noncurrent	[2]					433,000,000.0												381,700,000																																																					433,000,000.0	381,700,000					433,000,000.0
Asset Retirement Obligation Costs [Member] | System Energy [Member]
Regulatory Assets [Line Items]
Regulatory Assets, Noncurrent	[2]					210,900,000												186,900,000																																																					210,900,000	186,900,000					210,900,000
Subsequent Event [Member] | Entergy Mississippi [Member]
Regulatory Assets [Line Items]
MPSC approved customer credits due to internal restructuring																																																																																		$ 4,500,000
Subsequent Event [Member] | Entergy New Orleans [Member]
Regulatory Assets [Line Items]
Annual customer credits																																																																															$ 5,000,000
Proposed Energy Smart Utility Performance Incentive					7.00%
Percent of Targeted Energy Smart Savings					100.00%
Public Utilities, Requested Rate Increase (Decrease), Amount				$ 45,000,000
Subsequent Event [Member] | Entergy Arkansas [Member]
Regulatory Assets [Line Items]
Projected Revenue Deficiency																																																																						$ 61,900,000
Subsequent Event [Member] | Natural Gas [Member] | Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Evaluation Period Cost Rate For Common Equity																																																																														9.80%
Earned return on common equity					10.78%
Rate Decrease					$ 256,000
Vidalia Purchased Power Agreement [Member]
Regulatory Assets [Line Items]
Regulatory Liability, Noncurrent	[3]					127,300,000												139,700,000																																																					127,300,000	139,700,000					127,300,000
Increase (Decrease) in Regulatory Liabilities																													(30,500,000)
Vidalia Purchased Power Agreement [Member] | Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Regulatory Liability, Noncurrent	[3]					127,300,000												139,700,000																																																					127,300,000	139,700,000					127,300,000
Louisiana Act 55 Financing Obligation [Member]
Regulatory Assets [Line Items]
Regulatory Liability, Noncurrent	[3]					97,100,000												111,100,000																																																					97,100,000	111,100,000					97,100,000
Increase (Decrease) in Regulatory Liabilities																													$ (25,000,000.0)
Louisiana Act 55 Financing Obligation [Member] | Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Regulatory Liability, Noncurrent	[3]					97,100,000												111,100,000																																																					97,100,000	111,100,000					97,100,000
Revenue Subject to Refund [Member]
Regulatory Assets [Line Items]
Regulatory Liability, Noncurrent						51,100,000												44,400,000																																																					51,100,000	44,400,000					51,100,000
Revenue Subject to Refund [Member] | Entergy Mississippi [Member]
Regulatory Assets [Line Items]
Provision recorded to reflect change in formula rate plan revenues compared to allowed rate of return																		9,300,000																																																						9,300,000
True-up to provision recorded to reflect change in formula rate plan revenues compared to allowed rate of return												900,000			800,000																																																	$ 800,000																$ 800,000
Regulatory Liability, Noncurrent						4,500,000												9,300,000																																																					4,500,000	9,300,000					4,500,000
Revenue Subject to Refund [Member] | Entergy Arkansas [Member]
Regulatory Assets [Line Items]
Provision recorded to reflect change in formula rate plan revenues compared to allowed rate of return																		35,100,000																																																						35,100,000
True-up to provision recorded to reflect change in formula rate plan revenues compared to allowed rate of return												$ 11,500,000
Regulatory Liability, Noncurrent						46,600,000												$ 35,100,000																																																					$ 46,600,000	$ 35,100,000					$ 46,600,000
Electricity [Member] | Entergy New Orleans [Member]
Regulatory Assets [Line Items]
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%
Public Utilities, Requested Rate Increase (Decrease), Amount						42,000,000		$ 36,000,000
Rider reductions included in decreased rates						29,000,000
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
Electricity [Member] | Subsequent Event [Member] | Entergy New Orleans [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount				42,000,000
Rider reductions included in decreased rates				29,000,000
Natural Gas [Member] | Entergy New Orleans [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Return on Equity, Percentage																					10.75%
Proposed rate reduction in revised filing																					$ 142,000
Public Utilities, Requested Rate Increase (Decrease), Amount						$ 3,000,000		$ 3,000,000
Natural Gas [Member] | Subsequent Event [Member] | Entergy New Orleans [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount				$ 3,000,000
Transmission Cost Recovery Factor Rider [Member] | Entergy Texas [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount										$ 19,400,000
Revenue increase resulting from incremental revenue										$ 16,700,000
Public Utilities, Approved Rate Increase (Decrease), Amount											$ 2,700,000
Distribution Cost Recovery Factor Rider [Member] | Entergy Texas [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount															$ 3,200,000
Grand Gulf [Member] | System Energy [Member]
Regulatory Assets [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage																																																																							11.50%

[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.