Commitments And Contingencies (Narrative) (Details)			1 Months Ended																12 Months Ended
	Jan. 01, 2018	Jun. 30, 2016 USD ($)	Dec. 31, 2017 USD ($) claim MW	Jun. 30, 2017 USD ($)	May 31, 2017 USD ($)	Jan. 31, 2017 USD ($)	Nov. 30, 2016 USD ($)	Oct. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Aug. 31, 2016 USD ($)	Jul. 31, 2016 USD ($)	Jun. 30, 2016 USD ($)	May 31, 2016 USD ($)	Apr. 30, 2016 USD ($)	Dec. 31, 2015 USD ($)	Oct. 31, 2015 USD ($)	Feb. 28, 2014 USD ($)	Nov. 30, 2013 USD ($)	Dec. 31, 2017 USD ($) program claim plaintiff reactor MW	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2015 USD ($)
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																			$ 26,157,000	$ 20,968,000	$ 24,399,000
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			127,300,000																127,300,000
Maximum retrospective insurance premium obligation per incident			1,146,000,000																1,146,000,000
Rate of maximum retrospective premium per year per nuclear power reactor			$ 19,000,000																19,000,000
ANI combined with Secondary Financial Protection Coverage																			13,000,000,000
Additional damage coverage for a terrorist event																			$ 100,000,000,000
Number of nuclear reactor included in the Secondary Financial Protection program | reactor																			102
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
Amount of additional insurance coverage per occurrence																			$ 20,000,000
Number of asbestos lawsuits | claim			200																200
Number of claimants in asbestos lawsuits | plaintiff																			500
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 Period has Passed																			100.00%
Percentage of Weekly Indemnity Paid After Deductible Second Period has Passed																			80.00%
Insurance coverage for public liability prior to January 1, 2017			$ 375,000,000																$ 375,000,000
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%
Increase (Decrease) in Regulatory Liabilities																			$ 2,915,795,000	158,031,000	61,241,000
Pilgrim [Member]
Commitments And Contingencies [Line Items]
Capacity Supply Obligations in ISO New England | MW			677																677
Grand Gulf [Member]
Commitments And Contingencies [Line Items]
Ownership percentage by a non-affiliated company																			10.00%
Indian Point [Member]
Commitments And Contingencies [Line Items]
Primary Insurance Layer Conditions Of Coverage																			$ 500,000,000
Vermont Yankee [Member]
Commitments And Contingencies [Line Items]
Insurance coverage for public liability by American Nuclear Insurers			$ 100,000,000																100,000,000
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] | Vermont Yankee [Member]
Commitments And Contingencies [Line Items]
Primary Insurance Layer Conditions Of Coverage																			50,000,000
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
Accidental Outage Coverage Program [Member] | Nuclear Plants [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence			327,600,000																327,600,000
Accidental Outage Coverage Program [Member] | Grand Gulf [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence			327,600,000																327,600,000
Accidental Outage Coverage Program [Member] | Waterford 3 and Grand Gulf [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence			327,600,000																327,600,000
Flood, Earthquake and Volcanic Eruption [Member] | Pilgrim [Member]
Commitments And Contingencies [Line Items]
Primary Insurance Layer Conditions Of Coverage																			500,000,000
Wind, Flood, Earthquake and Volcanic Eruption [Member] | Vermont Yankee [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 [Member] | Pilgrim [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
Flood event [Member] | ANO and Grand Gulf [Member]
Commitments And Contingencies [Line Items]
Primary Insurance Layer Conditions Of Coverage																			500,000,000
Flood event [Member] | River Bend and Waterford 3 [Member]
Commitments And Contingencies [Line Items]
Primary Insurance Layer Conditions Of Coverage																			500,000,000
Subsequent Event [Member]
Commitments And Contingencies [Line Items]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%
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
Entergy Wholesale Commodities [Member] | Pilgrim [Member]
Commitments And Contingencies [Line Items]
Carrying Value of Nuclear Plant																							$ 718,000,000
Entergy Wholesale Commodities [Member] | FitzPatrick [Member]
Commitments And Contingencies [Line Items]
Carrying Value of Nuclear Plant																							$ 742,000,000
Entergy Wholesale Commodities [Member] | Palisades [Member]
Commitments And Contingencies [Line Items]
Carrying Value of Nuclear Plant															$ 859,000,000					558,000,000	859,000,000
Entergy Wholesale Commodities [Member] | Indian Point [Member]
Commitments And Contingencies [Line Items]
Carrying Value of Nuclear Plant																				2,619,000,000
Entergy Wholesale Commodities [Member] | Primary Layer [Member] | Big Rock Point [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence			500,000,000																500,000,000
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
Entergy Wholesale Commodities [Member] | Primary Layer [Member] | Vermont Yankee [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] | Pilgrim and Palisades [Member]
Commitments And Contingencies [Line Items]
Property Insurance insured amount per occurrence			$ 1,115,000,000																1,115,000,000
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]
Proceeds from insurance																			$ 0	0	12,932,000
Percentage of capacity and energy agreed to sell by system energy from grand gulf																			33.00%
Average monthly payments under unit power sales agreement																			$ 17,000,000
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																			$ 405,395,000	(2,986,000)	9,172,000
Entergy Texas [Member]
Commitments And Contingencies [Line Items]
Proceeds from insurance																			$ 2,431,000	0	0
Number of asbestos lawsuits | claim			80																80
Number of claimants in asbestos lawsuits | plaintiff																			600
Increase (Decrease) in Regulatory Liabilities																			$ 410,968,000	2,106,000	1,271,000
System Energy [Member]
Commitments And Contingencies [Line Items]
Number of nuclear power reactors | reactor																			1
Increase (Decrease) in Regulatory Liabilities																			$ 331,251,000	33,438,000	(33,686,000)
System Energy [Member] | Grand Gulf [Member]
Commitments And Contingencies [Line Items]
Litigation Settlement, Amount				$ 49,000,000
System Energy ownership in nuclear unit										90.00%
Damages awarded for previously capitalized costs										$ 16,000,000
Damages awarded for previously recorded operation and maintenance										9,000,000
Damages awarded for previously recorded nuclear fuel expense										19,000,000
Reduction of previously recorded deprecation expense										5,000,000
Plant balance reduction										11,000,000
Entergy New Orleans [Member]
Commitments And Contingencies [Line Items]
Number of asbestos lawsuits | claim			80																80
Number of claimants in asbestos lawsuits | plaintiff																			600
Percentage of capacity and energy agreed to sell by system energy from grand gulf																			17.00%
Average monthly payments under unit power sales agreement																			$ 9,400,000
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																			$ 110,147,000	(3,997,000)	(7,359,000)
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																			$ 122,900,000	158,700,000	146,000,000
Required energy for the production of Vidalia project in percentage																			94.00%
Estimated Payments Under Purchased Power Agreement in Next Twelve Months			$ 129,000,000																$ 129,000,000
Estimated Payments Under Purchased Power Agreement in Year Two and Thereafter			$ 1,680,000,000																1,680,000,000
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
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
Proceeds from insurance																			$ 5,305,000	10,564,000	0
Number of nuclear power reactors | reactor																			2
Number of asbestos lawsuits | claim			80																80
Number of claimants in asbestos lawsuits | plaintiff																			600
Percentage of capacity and energy agreed to sell by system energy from grand gulf																			14.00%
Average monthly payments under unit power sales agreement																			$ 7,800,000
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																			$ 605,453,000	62,351,000	96,234,000
Entergy Louisiana [Member] | Waterford 3 [Member]
Commitments And Contingencies [Line Items]
Litigation Settlement, Amount										53,000,000
Damages awarded for previously capitalized costs							$ 41,000,000
Damages awarded for previously recorded operation and maintenance							2,000,000
Damages awarded for previously recorded nuclear fuel expense							10,000,000
Reduction of previously recorded deprecation expense							$ 3,000,000
Entergy Louisiana [Member] | River Bend [Member]
Commitments And Contingencies [Line Items]
Litigation Settlement, Amount					$ 600,000				$ 5,000,000					$ 42,000,000
Damages awarded for previously capitalized costs										17,000,000
Damages awarded for previously recorded operation and maintenance						$ 3,000,000				2,000,000
Damages awarded for previously recorded nuclear fuel expense						2,000,000				23,000,000
Reduction of previously recorded deprecation expense										3,000,000
Plant balance reduction										$ 14,000,000
Entergy Arkansas [Member]
Commitments And Contingencies [Line Items]
Estimated cost to restore ANO to service																			95,000,000
Deferred Fuel and Purchased Energy Costs Excluded From Revised Energy Cost Rate																	$ 65,900,000
Proceeds From Insurance Settlement, Operating and Investing Activities																						$ 50,000,000
Proceeds from insurance																			$ 0	10,404,000	11,654,000
Number of nuclear power reactors | reactor																			2
Number of asbestos lawsuits | claim			80																80
Number of claimants in asbestos lawsuits | plaintiff																			600
Percentage of capacity and energy agreed to sell by system energy from grand gulf																			36.00%
Average monthly payments under unit power sales agreement																			$ 19,500,000
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																				44,000,000
Increase (Decrease) in Regulatory Liabilities																			$ 1,043,507,000	$ 62,994,000	$ (11,123,000)
Entergy Arkansas [Member] | ANO [Member]
Commitments And Contingencies [Line Items]
Litigation Settlement, Amount											$ 31,000,000
Damages awarded for previously capitalized costs								$ 6,000,000
Damages awarded for previously recorded operation and maintenance								5,000,000
Damages awarded for previously recorded nuclear fuel expense								19,000,000
Damages awarded for previously recorded taxes other than income taxes								1,000,000
Entergy Wholesale Commodities [Member] | Pilgrim [Member]
Commitments And Contingencies [Line Items]
NRC inspection costs																			50,000,000
Entergy Wholesale Commodities [Member] | Indian Point and Fitzpatrick [Member]
Commitments And Contingencies [Line Items]
Litigation Settlement, Amount															$ 81,000,000
Entergy Wholesale Commodities [Member] | Indian Point 3 [Member]
Commitments And Contingencies [Line Items]
Damages awarded for previously capitalized costs		$ 45,000,000
Damages awarded for previously recorded operation and maintenance		2,000,000
Reduction of previously recorded deprecation expense		8,000,000
Plant balance reduction		37,000,000
Entergy Wholesale Commodities [Member] | FitzPatrick [Member]
Commitments And Contingencies [Line Items]
Damages awarded for previously capitalized costs		32,000,000
Damages awarded for previously recorded operation and maintenance		2,000,000
Reduction of previously recorded deprecation expense		1,000,000
Plant balance reduction		10,000,000
Carrying Value of Nuclear Plant		$ 0										$ 0
Entergy Wholesale Commodities [Member] | Palisades [Member]
Commitments And Contingencies [Line Items]
Litigation Settlement, Amount									$ 14,000,000							$ 21,000,000
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
Entergy Wholesale Commodities [Member] | Indian Point 2 [Member]
Commitments And Contingencies [Line Items]
Litigation Settlement, Amount								$ 34,000,000
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
Entergy Wholesale Commodities [Member] | Vermont Yankee [Member]
Commitments And Contingencies [Line Items]
Litigation Settlement, Amount													$ 19,000,000
Damages awarded for previously capitalized costs												15,000,000
Damages awarded for previously recorded operation and maintenance												4,000,000
Reduction of previously recorded deprecation expense												2,000,000
Reduction to operation and maintenance expense												$ 13,000,000
Entergy Wholesale Commodities [Member] | Minimum [Member] | Pilgrim [Member]
Commitments And Contingencies [Line Items]
Expected NRC inspection costs			$ 45,000,000																45,000,000
Entergy Wholesale Commodities [Member] | Maximum [Member] | Pilgrim [Member]
Commitments And Contingencies [Line Items]
Expected NRC inspection costs			60,000,000																$ 60,000,000
Vidalia Purchased Power Agreement [Member]
Commitments And Contingencies [Line Items]
Increase (Decrease) in Regulatory Liabilities			$ (30,500,000)