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, 2020 USD ($)	Dec. 31, 2019 USD ($) claim	Aug. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Oct. 31, 2015 USD ($)	Feb. 28, 2014 USD ($)	Nov. 30, 2013 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) program claim reactor	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2026 USD ($)	Oct. 01, 2012 USD ($)
Commitments And Contingencies [Line Items]
Accidental Outage Coverage Weekly Indemnity Payment Period															364 days
Accidental Outage Coverage Weekly Indemnity Final Payment Period															406 days
Proceeds from insurance															$ 7,040,000	$ 18,270,000	$ 26,157,000
Number of financial protection programs | program															2
Insurance coverage for public liability by American Nuclear Insurers			$ 450,000,000												$ 450,000,000
Maximum retrospective insurance premium obligation per reactor per incident			137,600,000												137,600,000
Maximum retrospective insurance premium obligation per incident			1,101,000,000												1,101,000,000
Rate of maximum retrospective premium per year per nuclear power reactor			$ 21,000,000												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															98
Total premium for reactor under secondary financial protection program															$ 14,000,000,000
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%
Accidental Outage Coverage Weekly Indemnity Second Payment Period															364 days
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															$ (14,781,000)	$ (803,323,000)	$ 2,915,795,000
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
Earthquake and Volcanic Eruption [Member] | Indian Point [Member]
Commitments And Contingencies [Line Items]
Primary Insurance Layer Conditions Of Coverage															500,000,000
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												200
Number of claimants in asbestos lawsuits | claim															400
Utility [Member] | Primary Layer [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence			$ 1,500,000,000												$ 1,500,000,000
Utility [Member] | Blanket Layer [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence			100,000,000												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												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												50,000,000
Entergy Wholesale Commodities [Member] | Primary Layer [Member] | Indian Point [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence			1,600,000,000												1,600,000,000
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															$ 15,500,000
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															$ (21,524,000)	(131,856,000)	405,395,000
Entergy Texas [Member]
Commitments And Contingencies [Line Items]
Proceeds from insurance															0	0	2,431,000
Increase (Decrease) in Regulatory Liabilities															$ (105,517,000)	(19,336,000)	410,968,000
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															$ 130,949,000	(156,802,000)	331,251,000
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															$ 8,500,000
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															$ (22,105,000)	(28,459,000)	110,147,000
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															$ 135,500,000	137,600,000	122,900,000
Required energy for the production of Vidalia project in percentage															94.00%
Estimated Payments Under Purchased Power Agreement in Next Twelve Months			131,000,000												$ 131,000,000
Estimated Payments Under Purchased Power Agreement in Year Two and Thereafter			1,440,000,000												1,440,000,000
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															$ 7,040,000	3,480,000	5,305,000
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															$ 7,000,000
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															$ (35,881,000)	(125,185,000)	605,453,000
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	14,790,000	0
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															$ 17,600,000
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															$ 39,293,000	$ (341,682,000)	$ 1,043,507,000
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
Litigation Settlement, Amount Awarded from Other Party			80,000,000
Entergy Arkansas [Member] | Subsequent Event [Member] | ANO [Member]
Commitments And Contingencies [Line Items]
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
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] | Palisades [Member]
Commitments And Contingencies [Line Items]
Damages awarded for previously capitalized costs								$ 11,000,000
Damages awarded for previously recorded operation and maintenance								3,000,000
Reduction of previously recorded deprecation expense								1,000,000
Plant balance reduction								10,000,000
Litigation Settlement, Amount Awarded from Other Party										$ 14,000,000	$ 21,000,000
Entergy Wholesale Commodities [Member] | Indian Point 2 [Member]
Commitments And Contingencies [Line Items]
Damages awarded for previously capitalized costs								14,000,000
Damages awarded for previously recorded operation and maintenance								15,000,000
Damages awarded for previously recorded decommissioning expense								3,000,000
Damages awarded for previously recorded taxes other than income taxes								2,000,000
Reduction of previously recorded deprecation expense								3,000,000
Plant balance reduction								$ 11,000,000
Litigation Settlement, Amount Awarded from Other Party									$ 34,000,000
Vidalia Purchased Power Agreement [Member]
Commitments And Contingencies [Line Items]
Increase (Decrease) in Regulatory Liabilities							$ (30,500,000)