Commitments And Contingencies (Narrative) (Details)		1 Months Ended											3 Months Ended	12 Months Ended								84 Months Ended	120 Months Ended
	Jan. 01, 2018	Jan. 31, 2021 USD ($)	Oct. 31, 2020 USD ($)	Apr. 30, 2020 USD ($)	Jan. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Aug. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Feb. 28, 2014 USD ($)	Nov. 30, 2013 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2020 USD ($) reactor claim program	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Dec. 31, 2026 USD ($)	Oct. 01, 2012 USD ($)
Commitments And Contingencies [Line Items]
Proceeds from insurance														$ 0	$ 7,040,000	$ 18,270,000
Number of financial protection programs | program														2
Insurance coverage for public liability by American Nuclear Insurers														$ 450,000,000
Maximum retrospective insurance premium obligation per reactor per incident														137,600,000
Maximum retrospective insurance premium obligation per incident														1,101,000,000
Rate of maximum retrospective premium per year per nuclear power reactor														21,000,000
ANI combined with Secondary Financial Protection Coverage														14,000,000,000
Additional damage coverage for a terrorist event														$ 100,000,000,000
Number of nuclear reactor included in the Secondary Financial Protection program | reactor														97
Total premium for reactor under secondary financial protection program														$ 13,000,000,000
Maximum recovery nuclear insurance policies for property damage caused by Terrorist Act														3,240,000,000
Maximum conventional property insurance coverage on an each and every loss basis														400,000,000
Minimum value of power plants, substations to be covered under conventional property insurance														5,000,000
Purchase of terrorism insurance coverage														$ 300,000,000
Reduction in fee Entergy’s nuclear owner/licensee subsidiaries have been charged related to spent nuclear fuel storage												$ 0
Percentage of Weekly Indemnity Paid After Deductible Second Period has Passed														80.00%
Percentage of Weekly Indemnity Paid After Deductible Final Period has Passed														80.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%															35.00%	35.00%
Increase (Decrease) in Regulatory Liabilities														$ 238,669,000	(14,781,000)	$ (803,323,000)
Percentage of Weekly Indemnity Paid After Deductible First Period has Passed														100.00%
Grand Gulf [Member]
Commitments And Contingencies [Line Items]
Ownership percentage by a non-affiliated company														10.00%
Operational Perils [Member]
Commitments And Contingencies [Line Items]
Self-insured retention per occurrence														$ 20,000,000
Earthquake and Flood [Member]
Commitments And Contingencies [Line Items]
Maximum conventional property insurance coverage on an each and every loss basis														400,000,000
Self-insured retention per occurrence														40,000,000
Named Windstorm and Associated Storm Surge [Member]
Commitments And Contingencies [Line Items]
Maximum conventional property insurance coverage on an each and every loss basis														125,000,000
Self-insured retention per occurrence														40,000,000
Non-Nuclear and Non-Radioactive Damage [Member] | Pilgrim, Palisades, and Indian Point [Member]
Commitments And Contingencies [Line Items]
Primary Insurance Layer Conditions Of Coverage														500,000,000
Wind and Flood [Member] | Indian Point [Member]
Commitments And Contingencies [Line Items]
Property Insurance Deductible														$ 10,000,000
Percentage of Additional Property Insurance Deductible for Loss in Excess of Deductible														10.00%
Maximum Additional Property Insurance Deductible														$ 50,000,000
Wind, Flood, Earthquake and Volcanic Eruption [Member] | Palisades [Member]
Commitments And Contingencies [Line Items]
Property Insurance Deductible														$ 10,000,000
Percentage of Additional Property Insurance Deductible for Loss in Excess of Deductible														10.00%
Maximum Additional Property Insurance Deductible														$ 50,000,000
Wind, Flood, Earthquake and Volcanic Eruption [Member] | Big Rock Point [Member]
Commitments And Contingencies [Line Items]
Maximum Additional Property Insurance Deductible														14,000,000
Flood event [Member] | ANO and Grand Gulf [Member]
Commitments And Contingencies [Line Items]
Primary Insurance Layer Conditions Of Coverage														$ 500,000,000
Utility [Member] | Asbestos Issue [Member]
Commitments And Contingencies [Line Items]
Number of asbestos lawsuits | claim														200
Number of claimants in asbestos lawsuits | claim														350
Utility [Member] | Primary Layer [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence														$ 1,500,000,000
Utility [Member] | Blanket Layer [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence														100,000,000
Utility [Member] | Earthquake and Volcanic Eruption [Member]
Commitments And Contingencies [Line Items]
Primary Insurance Layer Conditions Of Coverage														500,000,000
Utility [Member] | Flood event [Member] | River Bend and Waterford 3 [Member]
Commitments And Contingencies [Line Items]
Property Insurance Deductible														$ 10,000,000
Percentage of Additional Property Insurance Deductible for Loss in Excess of Deductible														10.00%
Maximum Additional Property Insurance Deductible														$ 50,000,000
Entergy Wholesale Commodities [Member] | Primary Layer [Member] | Palisades [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence														1,115,000,000
Entergy Wholesale Commodities [Member] | Primary Layer [Member] | Big Rock Point [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence														50,000,000
Entergy Wholesale Commodities [Member] | Primary Layer [Member] | Indian Point [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence														1,060,000,000.00
Nuclear [Member] | Wind [Member]
Commitments And Contingencies [Line Items]
Property Insurance Deductible														$ 10,000,000
Percentage of Additional Property Insurance Deductible for Loss in Excess of Deductible														10.00%
Maximum Additional Property Insurance Deductible														$ 50,000,000
Entergy Mississippi [Member]
Commitments And Contingencies [Line Items]
Percentage of capacity and energy agreed to sell by system energy from grand gulf														33.00%
Average monthly payments under unit power sales agreement														$ 13,800,000
Purchased Percentage Of Capacity And Energy Based On Agreement														31.30%
Amortization period of cost														27 years
Allocated amortization cost in percentage														43.97%
Increase (Decrease) in Regulatory Liabilities														$ (18,672,000)	(21,524,000)	(131,856,000)
Entergy Texas [Member]
Commitments And Contingencies [Line Items]
Increase (Decrease) in Regulatory Liabilities														$ (57,477,000)	(105,517,000)	(19,336,000)
System Energy [Member]
Commitments And Contingencies [Line Items]
Number of nuclear power reactors | reactor														1
Reduction of previously recorded deprecation expense													$ 26,000,000
Increase (Decrease) in Regulatory Liabilities														$ 140,965,000	130,949,000	(156,802,000)
Ownership														90.00%
System Energy [Member] | Grand Gulf [Member]
Commitments And Contingencies [Line Items]
Damages awarded for previously capitalized costs			$ 5,000,000
Damages awarded for previously recorded operation and maintenance			10,000,000
Damages awarded for previously recorded nuclear fuel expense			21,000,000
Litigation Settlement, Amount Awarded from Other Party			$ 40,500,000
Entergy New Orleans [Member]
Commitments And Contingencies [Line Items]
Percentage of capacity and energy agreed to sell by system energy from grand gulf														17.00%
Average monthly payments under unit power sales agreement														$ 7,600,000
Purchased Percentage Of Capacity And Energy Based On Agreement														24.70%
Amortization period of cost														27 years
Allocated amortization cost in percentage														29.80%
Increase (Decrease) in Regulatory Liabilities														$ (4,728,000)	(22,105,000)	(28,459,000)
Entergy New Orleans [Member] | Flood, Earthquake and Named Windstorm [Member]
Commitments And Contingencies [Line Items]
Maximum conventional property insurance coverage on an each and every loss basis														50,000,000
Entergy Louisiana [Member]
Commitments And Contingencies [Line Items]
Payments made under purchased power agreement														$ 132,700,000	135,500,000	137,600,000
Required energy for the production of Vidalia project in percentage														94.00%
Estimated Payments Under Purchased Power Agreement in Next Twelve Months														$ 141,000,000
Estimated Payments Under Purchased Power Agreement in Year Two and Thereafter														1,410,000,000
Credit rates agreed by subsidiary for each year under settlement related to tax benefits from tax treatment of purchased power agreement																							$ 11,000,000
Number of years for which credit rates agreed by subsidiary under settlement related to tax benefits from the tax treatment of purchased power agreement																							10 years
Proceeds from insurance														$ 0	7,040,000	3,480,000
Number of nuclear power reactors | reactor														2
Percentage of capacity and energy agreed to sell by system energy from grand gulf														14.00%
Average monthly payments under unit power sales agreement														$ 6,300,000
Purchased Percentage Of Capacity And Energy Based On Agreement														26.90%
Amortization period of cost														27 years
Allocated amortization cost in percentage														26.23%
Increase (Decrease) in Regulatory Liabilities														$ 71,698,000	(35,881,000)	(125,185,000)
Entergy Louisiana [Member] | Waterford 3 [Member]
Commitments And Contingencies [Line Items]
Damages awarded for previously capitalized costs				$ 5,000,000
Damages awarded for previously recorded operation and maintenance				8,000,000
Damages awarded for previously recorded nuclear fuel expense				20,000,000
Litigation Settlement, Amount Awarded from Other Party				$ 33,000,000
Entergy Louisiana [Member] | River Bend [Member]
Commitments And Contingencies [Line Items]
Damages awarded for previously capitalized costs							$ 2,000,000
Damages awarded for previously recorded operation and maintenance							5,000,000
Damages awarded for previously recorded nuclear fuel expense							12,000,000
Litigation Settlement, Amount Awarded from Other Party							$ 19,000,000
Entergy Louisiana [Member] | Subsequent Event [Member]
Commitments And Contingencies [Line Items]
Amount of remaining benefits of tax credit by crediting rate payers																						$ 20,235,000
Maximum period up to which remaining benefit of tax accounting election shared																						15 years
Entergy Arkansas [Member]
Commitments And Contingencies [Line Items]
Estimated cost to restore ANO to service																					$ 95,000,000
Proceeds From Insurance Settlement, Operating and Investing Activities																				$ 50,000,000
Proceeds from insurance														$ 0	0	14,790,000
Number of nuclear power reactors | reactor														2
Percentage of capacity and energy agreed to sell by system energy from grand gulf														36.00%
Average monthly payments under unit power sales agreement														$ 15,700,000
Purchased Percentage Of Capacity And Energy Based On Agreement														17.10%
Amortization period of cost														27 years
Incremental NRC Inspection Costs																			$ 53,000,000
NRC inspection and performance improvement costs																	$ 7,000,000	$ 44,000,000
Litigation Settlement, Amount Awarded from Other Party																21,000,000
Increase (Decrease) in Regulatory Liabilities														$ 106,878,000	$ 39,293,000	$ (341,682,000)
Entergy Arkansas [Member] | ANO [Member]
Commitments And Contingencies [Line Items]
Deferred Fuel and Purchased Energy Costs Excluded From Revised Energy Cost Rate											$ 65,900,000
Damages awarded for previously capitalized costs					$ 55,000,000
Damages awarded for previously recorded operation and maintenance					12,000,000
Damages awarded for previously recorded nuclear fuel expense					12,000,000
Damages awarded for previously recorded taxes other than income taxes					1,000,000
Reduction of previously recorded deprecation expense					$ 5,000,000
Litigation Settlement, Amount Awarded from Other Party						$ 80,000,000
Entergy Wholesale Commodities [Member]
Commitments And Contingencies [Line Items]
Number of nuclear power reactors														3
Entergy Wholesale Commodities [Member] | Pilgrim [Member]
Commitments And Contingencies [Line Items]
Damages awarded for previously capitalized costs								$ 60,000,000
Damages awarded for previously recorded operation and maintenance								2,000,000
Reduction of previously recorded deprecation expense								4,000,000
Reduction to operation and maintenance expense								46,000,000
Plant balance reduction								10,000,000
Litigation Settlement, Amount Awarded from Other Party									$ 62,000,000
Carrying Value of Nuclear Plant								$ 0
Entergy Wholesale Commodities [Member] | FitzPatrick [Member]
Commitments And Contingencies [Line Items]
Litigation Settlement, Amount Awarded from Other Party						7,000,000
Asset Write-Offs, Impairments, And Related Charges						$ 7,000,000
Entergy Wholesale Commodities [Member] | Big Rock Point [Member]
Commitments And Contingencies [Line Items]
Insurance coverage for public liability by American Nuclear Insurers														$ 44,400,000
Entergy Wholesale Commodities [Member] | Subsequent Event [Member] | Palisades [Member]
Commitments And Contingencies [Line Items]
Damages awarded for previously capitalized costs		$ 15,700,000
Damages awarded for previously recorded operation and maintenance		7,100,000
Damages awarded for previously recorded taxes other than income taxes		300,000
Reduction of previously recorded deprecation expense		9,100,000
Litigation Settlement, Amount Awarded from Other Party		$ 23,100,000
Vidalia Purchased Power Agreement [Member]
Commitments And Contingencies [Line Items]
Increase (Decrease) in Regulatory Liabilities										$ (30,500,000)