Acquisitions, Dispositions, and Impairment of Long-Lived Assets (Narrative) (Details)	1 Months Ended								3 Months Ended									12 Months Ended							29 Months Ended
	Oct. 31, 2019 USD ($) MW	Aug. 31, 2019 USD ($)	Jan. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Nov. 30, 2016	Aug. 31, 2016 USD ($) MW	Dec. 31, 2014 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 ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) $ / MWh	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	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									$ 2,462,305,000	$ 3,140,575,000	$ 2,666,209,000	$ 2,609,584,000	$ 2,512,482,000	$ 3,104,319,000	$ 2,668,770,000	$ 2,723,881,000					$ 10,878,673,000	$ 11,009,452,000	$ 11,074,481,000
Proceeds from Sale of Productive Assets																					28,932,000	24,902,000	100,000,000
Line of credit facility, maximum borrowing capacity									3,500,000,000												3,500,000,000
Amount Drawn/ Outstanding									440,000,000												440,000,000
Net Book Value				$ 49,831,486,000					54,271,467,000				49,831,486,000								54,271,467,000	49,831,486,000
Asset Retirement Obligation				6,923,400,000					6,159,200,000				6,923,400,000								6,159,200,000	6,923,400,000	6,185,800,000
Decommissioning Fund Investments				6,920,164,000					6,404,030,000				6,920,164,000								6,404,030,000	6,920,164,000
Asset Write-Offs, Impairments, And Related Charges																					226,678,000	491,739,000	357,251,000
Asset Impairment Charges																					290,027,000	532,321,000	538,372,000
After-Tax Asset Impairment Charge												4,200,000
Decommissioning																					400,802,000	388,508,000	405,685,000
Assets, Fair Value Disclosure				7,818,000,000					7,430,000,000				7,818,000,000								7,430,000,000	7,818,000,000
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																					2,259,594,000	2,060,643,000
Net Book Value				11,611,041,000					12,293,483,000				11,611,041,000								12,293,483,000	11,611,041,000
Asset Retirement Obligation				1,048,400,000					1,242,600,000				1,048,400,000								1,242,600,000	1,048,400,000	981,200,000
Decommissioning Fund Investments				912,049,000					1,101,283,000				912,049,000								1,101,283,000	912,049,000
Asset Retirement Obligation, Liabilities Incurred												126,200,000
Decommissioning																					68,030,000	60,420,000	56,860,000
Assets, Fair Value Disclosure				920,100,000					1,108,600,000				920,100,000								1,108,600,000	920,100,000
Entergy New Orleans [Member]
Business Acquisition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									153,032,000	194,204,000	175,793,000	163,194,000	150,487,000	200,182,000	178,446,000	188,275,000					686,223,000	717,390,000	716,070,000
Net Book Value				1,364,091,000					1,467,215,000				1,364,091,000								1,467,215,000	1,364,091,000
Asset Retirement Obligation				3,300,000					3,500,000				3,300,000								3,500,000	3,300,000	3,100,000
Assets, Fair Value Disclosure				104,100,000					90,900,000				104,100,000								90,900,000	104,100,000
Entergy Louisiana [Member]
Business Acquisition [Line Items]
Asset Write-Offs, Impairments, And Related Charges								$ 16,000,000
Revenue from Contract with Customer, Excluding Assessed Tax									987,851,000	$ 1,231,677,000	1,106,317,000	$ 959,330,000	987,576,000	1,206,612,000	$ 1,072,788,000	1,029,344,000					4,285,175,000	4,296,320,000	4,300,550,000
Proceeds from Sale of Productive Assets																					0	11,987,000	0
Net Book Value				20,532,312,000					22,620,365,000				20,532,312,000								22,620,365,000	20,532,312,000
Asset Retirement Obligation				1,280,300,000					1,497,300,000				1,280,300,000								1,497,300,000	1,280,300,000	1,140,500,000
Decommissioning Fund Investments				1,284,996,000					1,563,812,000				1,284,996,000								1,563,812,000	1,284,996,000
Asset Retirement Obligation, Liabilities Incurred											$ 147,500,000					$ 85,400,000
Decommissioning																					59,346,000	53,736,000	49,457,000
Assets, Fair Value Disclosure				1,631,400,000					1,870,200,000				1,631,400,000								1,870,200,000	1,631,400,000
Entergy Mississippi [Member]
Business Acquisition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax																					1,323,043,000	1,335,112,000
Net Book Value				4,780,720,000					5,672,589,000				4,780,720,000								5,672,589,000	4,780,720,000
Asset Retirement Obligation				9,200,000					9,700,000				9,200,000								9,700,000	9,200,000	9,200,000
Assets, Fair Value Disclosure				71,500,000					132,600,000				71,500,000								132,600,000	71,500,000
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
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes		156,000,000
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%
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
Vermont Yankee [Member]
Business Acquisition [Line Items]
Decommissioning Trust Fair Values				532,000,000									532,000,000									532,000,000
Asset Retirement Obligation				567,900,000					$ 0				567,900,000								0	567,900,000	401,500,000
Decommissioning Fund Investments				532,000,000									532,000,000									532,000,000
Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Asset Write-Offs, Impairments, And Related Charges																					290,027,000	532,321,000	538,372,000
Payments to Acquire Productive Assets																					104,300,000	283,707,000	320,667,000
Asset Write-Offs, Impairments, And Related Charges																					290,000,000	532,000,000	538,000,000
Impairment of Long-Lived Assets Held-For-Use, Net of Tax																					79,000,000	421,000,000
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																					$ 10,000,000	6,000,000	$ 28,000,000
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	$ 11,000,000
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 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
FitzPatrick [Member] | Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Capacity Of Power Plant Unit | MW							838
Non-refundable signing fee paid upon agreement and assumption by Exelon of certain liabilities							$ 10,000,000
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property					$ 16,000,000
Cost of Goods and Services Sold					8,000,000
Decommissioning Trust Fair Values					805,000,000												$ 805,000,000
Other operation and maintenance expense reimbursement																	98,000,000
Revenue from Contract with Customer, Excluding Assessed Tax																	7,000,000
Net Book Value					0												0
Asset Retirement Obligation					727,000,000												727,000,000
Proceeds from sale of business					$ 110,000,000
Reimbursement for taxes other than income taxes																	3,000,000
Nuclear defueling credit																	10,000,000
Income tax benefit resulting from sale of FitzPatrick																	$ 44,000,000
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
Gain (Loss) on Sale of Properties, Net of Applicable Income Taxes		$ 156,000,000
Pilgrim [Member] | Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Asset Retirement Obligation, Liabilities Incurred														$ 117,500,000