Acquisitions, Dispositions, and Impairment of Long-Lived Assets (Narrative) (Details)	1 Months Ended								3 Months Ended								12 Months Ended
	Jan. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Nov. 30, 2016 USD ($)	Aug. 31, 2016 MW	Mar. 31, 2016 USD ($) MW	Dec. 31, 2014 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2022 USD ($) $ / MWh	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($) $ / MWh	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2007 $ / MWh	Jun. 30, 2016 USD ($)
Business Acquisition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									$ 2,512,482,000	$ 3,104,319,000	$ 2,668,770,000	$ 2,723,881,000	$ 2,623,845,000	$ 3,243,628,000	$ 2,618,550,000	$ 2,588,458,000					$ 11,009,452,000	$ 11,074,481,000	$ 10,845,645,000
Proceeds from Sale of Productive Assets																					24,902,000	100,000,000	0
Line of credit facility, maximum borrowing capacity		$ 3,500,000,000							3,500,000,000												3,500,000,000
Amount Drawn/ Outstanding		220,000,000							220,000,000												220,000,000
Net Book Value		49,196,578,000							49,196,578,000				47,287,370,000								49,196,578,000	47,287,370,000
Asset Retirement Obligation		6,923,400,000		$ 6,706,800,000					6,923,400,000				6,185,800,000								6,923,400,000	6,185,800,000	6,706,800,000
Decommissioning Fund Investments		6,920,164,000							6,920,164,000				7,211,993,000								6,920,164,000	7,211,993,000
Asset Write-Offs, Impairments, And Related Charges																					491,739,000	357,251,000	2,835,637,000
Asset Impairment Charges																					532,321,000	538,372,000	2,835,637,000
Decommissioning																					388,508,000	405,685,000	327,425,000
Assets, Fair Value Disclosure		7,818,000,000							7,818,000,000				8,414,000,000								7,818,000,000	8,414,000,000
Entergy Arkansas [Member]
Business Acquisition [Line Items]
Net Book Value		11,611,041,000							11,611,041,000				11,059,538,000								11,611,041,000	11,059,538,000
Asset Retirement Obligation		1,048,400,000		924,400,000					1,048,400,000				981,200,000								1,048,400,000	981,200,000	924,400,000
Decommissioning Fund Investments		912,049,000							912,049,000				944,890,000								912,049,000	944,890,000
Decommissioning																					60,420,000	56,860,000	53,610,000
Assets, Fair Value Disclosure		920,100,000							920,100,000				954,000,000								920,100,000	954,000,000
Entergy New Orleans [Member]
Business Acquisition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax									150,487,000	200,182,000	178,446,000	188,275,000	171,842,000	199,017,000	176,222,000	168,989,000					717,390,000	716,070,000	665,463,000
Net Book Value		1,364,091,000							1,364,091,000				1,302,235,000								1,364,091,000	1,302,235,000
Asset Retirement Obligation		3,300,000		2,900,000					3,300,000				3,100,000								3,300,000	3,100,000	2,900,000
Gain on sale of asset																							38,000
Assets, Fair Value Disclosure		104,100,000							104,100,000				118,300,000								104,100,000	118,300,000
Entergy Louisiana [Member]
Business Acquisition [Line Items]
Asset Write-Offs, Impairments, And Related Charges								$ 16,000,000
Payments to Acquire Property, Plant, and Equipment							$ (475,000,000)
Revenue from Contract with Customer, Excluding Assessed Tax									987,576,000	$ 1,206,612,000	$ 1,072,788,000	1,029,344,000	1,045,839,000	$ 1,290,494,000	$ 1,083,434,000	880,783,000					4,296,320,000	4,300,550,000	4,177,048,000
Proceeds from Sale of Productive Assets																					11,987,000	0	0
Net Book Value		20,532,312,000							20,532,312,000				19,678,536,000								20,532,312,000	19,678,536,000
Asset Retirement Obligation		1,280,300,000		1,082,700,000					1,280,300,000				1,140,500,000								1,280,300,000	1,140,500,000	1,082,700,000
Decommissioning Fund Investments		1,284,996,000							1,284,996,000				1,312,073,000								1,284,996,000	1,312,073,000
Increase in decommissioning liability												$ 85,400,000
Decommissioning																					53,736,000	49,457,000	46,944,000
Assets, Fair Value Disclosure		1,631,400,000							1,631,400,000				1,643,900,000								1,631,400,000	1,643,900,000
Entergy Mississippi [Member]
Business Acquisition [Line Items]
Net Book Value		4,780,720,000							4,780,720,000				4,660,297,000								4,780,720,000	4,660,297,000
Asset Retirement Obligation		9,200,000		8,700,000					9,200,000				9,200,000								9,200,000	9,200,000	8,700,000
Assets, Fair Value Disclosure		71,500,000							71,500,000				38,600,000								71,500,000	38,600,000
FitzPatrick [Member]
Business Acquisition [Line Items]
Asset Retirement Obligation				714,300,000									0									0	714,300,000
Entergy Nuclear Vermont Yankee [Member]
Business Acquisition [Line Items]
Line of credit facility, maximum borrowing capacity		145,000,000							145,000,000												145,000,000
Amount Drawn/ Outstanding		139,000,000							139,000,000												139,000,000
Entergy Nuclear Vermont Yankee [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Line of credit facility, maximum borrowing capacity	$ 139,000,000
Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Asset Retirement Obligation		3,679,000,000		3,827,400,000					3,679,000,000				3,183,300,000								3,679,000,000	3,183,300,000	3,827,400,000
Vermont Yankee [Member]
Business Acquisition [Line Items]
Asset Retirement Obligation		567,900,000		$ 470,500,000					567,900,000				401,500,000								567,900,000	401,500,000	$ 470,500,000
Decommissioning Fund Investments		532,000,000							532,000,000				613,000,000								532,000,000	613,000,000
Palisades [Member]
Business Acquisition [Line Items]
Weighted Average Cost Of Capital Used In Asset Valuation				6.50%																			6.50%
Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Asset Write-Offs, Impairments, And Related Charges																					532,321,000	538,372,000	$ 2,835,637,000
Decommissioning Trust Fair Values		3,853,700,000							3,853,700,000				$ 4,049,300,000								3,853,700,000	4,049,300,000
Asset Write-Offs, Impairments, And Related Charges																					532,000,000	538,000,000
Impairment of Long-Lived Assets Held-For-Use, Net of Tax																					$ 421,000,000	350,000,000
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]
Percentage of plants output covered by PPA																								100.00%
Price under PPA, lower range | $ / MWh																								43.50
Average price under PPA | $ / MWh																					51
Amounts amortized to revenue																					$ 6,000,000	$ 28,000,000	13,000,000
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	$ 10,000,000
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
Asset Impairment Charges									173,000,000
Vermont Yankee [Member] | Entergy Wholesale Commodities [Member] | Subsequent Event [Member]
Business Acquisition [Line Items]
Increase (Decrease) in Notes Payable, Current	$ 139,000,000
Union Power Station [Member]
Business Acquisition [Line Items]
Capacity Of Power Plant Unit | MW							1,980
Capacity Per Power Block | MW							495
Payments to Acquire Property, Plant, and Equipment							$ (949,000,000)
Union Power Station [Member] | Entergy Arkansas [Member]
Business Acquisition [Line Items]
Payments to Acquire Property, Plant, and Equipment							$ (237,323,000)
Power Blocks Purchased							1
Percentage of Undivided Ownership Interest							25.00%
Union Power Station [Member] | Entergy New Orleans [Member]
Business Acquisition [Line Items]
Payments to Acquire Property, Plant, and Equipment							$ (237,335,000)
Power Blocks Purchased							1
Percentage of Undivided Ownership Interest							25.00%
Union Power Station [Member] | Entergy Louisiana [Member]
Business Acquisition [Line Items]
Payments to Acquire Property, Plant, and Equipment							$ (474,670,000)
Power Blocks Purchased							2
Percentage of Undivided Ownership Interest							50.00%
Top Deer [Member] | Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Proceeds from sale of business					$ 500,000
Gain on sale of asset					$ 200,000
Equity Method Investment, Ownership Percentage					50.00%
Indian Point [Member] | Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Asset Write-Offs, Impairments, And Related Charges																							2,343,000,000
Increase (Decrease) in Asset Retirement Obligations																							392,000,000
Carrying Value of Nuclear Plant				$ 2,619,000,000																			2,619,000,000
Asset Write-Offs, Impairments, And Related Charges																							2,186,000,000
Asset Impairment Charges																							157,000,000
After-Tax Asset Impairment Charge																							1,511,000,000
Assets, Fair Value Disclosure				433,000,000																			433,000,000
FitzPatrick [Member] | Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Carrying Value of Nuclear Plant																									$ 0
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
Palisades [Member] | Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Asset Write-Offs, Impairments, And Related Charges																							400,000,000
Requested payment to Entergy for early termination of purchased power agreement				172,000,000
Increase (Decrease) in Asset Retirement Obligations																							129,000,000
Carrying Value of Nuclear Plant				558,000,000																			558,000,000
Asset Write-Offs, Impairments, And Related Charges																							352,000,000
Asset Impairment Charges																							48,000,000
After-Tax Asset Impairment Charge																							258,000,000
Assets, Fair Value Disclosure				$ 206,000,000																			$ 206,000,000
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