Acquisitions, Dispositions, and Impairment of Long-Lived Assets Narrative (Details)	1 Months Ended						3 Months Ended										12 Months Ended						29 Months Ended
	Nov. 30, 2020 USD ($) MW	Oct. 31, 2019 USD ($) MW	Aug. 31, 2019 USD ($)	Jan. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Nov. 30, 2016	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($) $ / MWh	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2007 $ / MWh	May 31, 2022 $ / MWh	Oct. 31, 2018 USD ($)	Jul. 31, 2018
Business Acquisition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax							$ 2,370,101,000	$ 2,903,568,000	$ 2,412,788,000	$ 2,427,179,000	$ 2,462,305,000	$ 3,140,575,000	$ 2,666,209,000	$ 2,609,584,000					$ 10,113,636,000	$ 10,878,673,000	$ 11,009,452,000
Proceeds from Sale of Productive Assets																			0	28,932,000	24,902,000
Line of credit facility, maximum borrowing capacity							3,500,000,000												3,500,000,000
Amount Drawn/ Outstanding							165,000,000												165,000,000
Net Book Value							59,696,443,000				54,271,467,000								59,696,443,000	54,271,467,000
Asset Retirement Obligation					$ 6,923,400,000		6,469,500,000				6,159,200,000				$ 6,923,400,000				6,469,500,000	6,159,200,000	6,923,400,000
Decommissioning Fund Investments							7,253,215,000				6,404,030,000								7,253,215,000	6,404,030,000
Asset Write-Offs, Impairments, And Related Charges																			26,379,000	226,678,000	491,739,000
Asset Impairment Charges																			26,623,000	290,027,000	532,321,000
After-Tax Asset Impairment Charge														4,200,000
Decommissioning																			381,861,000	400,802,000	388,508,000
Assets, Fair Value Disclosure							9,122,000,000				7,430,000,000								9,122,000,000	7,430,000,000
Discontinued Operation, Tax Effect of Discontinued Operation														29,000,000
Restructuring Costs and Asset Impairment Charges														5,400,000
Entergy Arkansas [Member]
Business Acquisition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax																			2,084,494,000	2,259,594,000
Net Book Value							12,905,322,000				12,293,483,000								12,905,322,000	12,293,483,000
Asset Retirement Obligation					1,048,400,000		1,314,200,000				1,242,600,000				1,048,400,000				1,314,200,000	1,242,600,000	1,048,400,000
Decommissioning Fund Investments							1,273,921,000				1,101,283,000								1,273,921,000	1,101,283,000
Asset Retirement Obligation, Liabilities Incurred														126,200,000
Decommissioning																			73,319,000	68,030,000	60,420,000
Assets, Fair Value Disclosure							1,444,600,000				1,108,600,000								1,444,600,000	1,108,600,000
Entergy New Orleans [Member]
Business Acquisition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax							155,132,000	182,064,000	147,343,000	149,302,000	153,032,000	194,204,000	175,793,000	163,194,000					633,841,000	686,223,000	717,390,000
Net Book Value							1,821,638,000				1,467,215,000								1,821,638,000	1,467,215,000
Asset Retirement Obligation					3,300,000		3,800,000				3,500,000				3,300,000				3,800,000	3,500,000	3,300,000
Assets, Fair Value Disclosure							86,500,000				90,900,000								86,500,000	90,900,000
Reduction to income tax expense																			8,000,000
Entergy Louisiana [Member]
Business Acquisition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax							1,007,541,000	$ 1,120,022,000	$ 1,011,652,000	$ 930,647,000	987,851,000	$ 1,231,677,000	1,106,317,000	$ 959,330,000					4,069,862,000	4,285,175,000	4,296,320,000
Proceeds from Sale of Productive Assets																			0	0	11,987,000
Net Book Value							25,619,789,000				22,620,365,000								25,619,789,000	22,620,365,000
Asset Retirement Obligation					1,280,300,000		1,573,300,000				1,497,300,000				1,280,300,000				1,573,300,000	1,497,300,000	1,280,300,000
Decommissioning Fund Investments							1,794,042,000				1,563,812,000								1,794,042,000	1,563,812,000
Asset Retirement Obligation, Liabilities Incurred													$ 147,500,000
Decommissioning																			65,225,000	59,346,000	53,736,000
Assets, Fair Value Disclosure							2,528,900,000				1,870,200,000								2,528,900,000	1,870,200,000
Entergy Mississippi [Member]
Business Acquisition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax																			1,247,854,000	1,323,043,000
Net Book Value							6,084,730,000				5,672,589,000								6,084,730,000	5,672,589,000
Asset Retirement Obligation					9,200,000		9,800,000				9,700,000				9,200,000				9,800,000	9,700,000	9,200,000
Assets, Fair Value Disclosure							65,200,000				132,600,000								65,200,000	132,600,000
Entergy Nuclear Generation Company [Member]
Business Acquisition [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property			$ 190,000,000
Decommissioning Trust Fair Values			1,030,000,000
Net Book Value			0
Asset Retirement Obligation			837,000,000
Proceeds from sale of business			1,000
Percentage of Undivided Ownership Interest																									100.00%
Reduction to income tax expense			156,000,000
Entergy Nuclear Vermont Yankee [Member]
Business Acquisition [Line Items]
Line of credit facility, maximum borrowing capacity							139,000,000												139,000,000
Amount Drawn/ Outstanding							$ 139,000,000												139,000,000
Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Reduction to income tax expense											174,000,000
Vermont Yankee [Member]
Business Acquisition [Line Items]
Asset Retirement Obligation					567,900,000						$ 0				567,900,000					0	567,900,000
Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Asset Write-Offs, Impairments, And Related Charges																			26,623,000	290,027,000	532,321,000
Payments to Acquire Productive Assets																			54,455,000	104,300,000	283,707,000
Asset Write-Offs, Impairments, And Related Charges																			$ 19,000,000	290,000,000	532,000,000
Impairment of Long-Lived Assets Held-For-Use, Net of Tax																				79,000,000
Asset impairment excluding loss from sale of assets																				100,000,000
Entergy Wholesale Commodities [Member] | Vermont Yankee [Member]
Business Acquisition [Line Items]
Percent of Equity Interest to be included in nuclear plant purchase and sale agreement						100.00%
Palisades [Member] | Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Price Under PPA Lower Range Per MWH | $ / MWh																						43.50
Average Price Under PPA | $ / MWh																			51
Amortization of Intangible Assets																			$ 11,000,000	$ 10,000,000	6,000,000
Palisades [Member] | Entergy Wholesale Commodities [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Accelerated Finite Lived Intangible Assets Amortization Expenses due to termination of PPA																	$ 5,000,000	$ 12,000,000
Scenario, Forecast [Member] | Palisades [Member] | Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Price Under PPA Upper Range Per MWH | $ / MWh																							61.50
Vermont Yankee [Member] | Entergy Louisiana [Member]
Business Acquisition [Line Items]
Capacity Of Power Plant Unit | MW	361
Payments to Acquire Productive Assets	$ 261,000,000
Payments to Acquire Property, Plant, and Equipment	$ 222,000,000
Willow Glen [Member] | Entergy Louisiana [Member]
Business Acquisition [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property					14,800,000
Proceeds from Sale of Productive Assets					12,000,000
Regulatory liability assumed in sale of assets					5,700,000										5,700,000						5,700,000
Regulatory liability recognized for the refund of customer excess collections					31,900,000										31,900,000						31,900,000
Choctaw [Member] | Entergy Mississippi [Member]
Business Acquisition [Line Items]
Capacity Of Power Plant Unit | MW		810
Payments to Acquire Productive Assets		$ 305,000,000
Pilgrim [Member] | Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Carrying Value of Nuclear Plant																								$ 0
Pilgrim [Member] | Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property			190,000,000
Reduction to income tax expense			$ 156,000,000
Vermont Yankee [Member] | Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Decommissioning Trust Fair Values					532,000,000										532,000,000						532,000,000
Asset retirement costs asset					127,000,000										127,000,000						127,000,000
Asset Retirement Obligation					$ 568,000,000										568,000,000						$ 568,000,000
Increase (Decrease) in Notes Payable, Current				$ 139,000,000
Asset Impairment Charges															$ 173,000,000
Pilgrim [Member] | Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Asset Retirement Obligation, Liabilities Incurred																$ 117,500,000