Acquisitions, Dispositions, and Impairment of Long-Lived Assets (Narrative) (Details)	1 Months Ended								3 Months Ended	9 Months Ended	12 Months Ended									96 Months Ended
	Sep. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Nov. 30, 2016 USD ($)	Aug. 31, 2016 MW	Mar. 31, 2016 USD ($) MW	Dec. 31, 2015 USD ($) MW	Dec. 31, 2014 USD ($)	Mar. 31, 2017 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2022 USD ($) $ / MWh	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($) $ / MWh	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2007 $ / MWh	Dec. 31, 2014 USD ($) $ / MWh	Jan. 31, 2017 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)
Business Acquisition [Line Items]
Asset Write-Offs, Impairments, And Related Charges																$ 538,372,000	$ 2,835,637,000	$ 2,104,906,000
Requested payment to Entergy for early termination of purchased power agreement			$ 172,000,000
Approved payment to Entergy for early termination of purchased power agreement by regulatory authority	$ 136,600,000
Line of credit facility, maximum borrowing capacity																3,500,000,000
Amount Drawn/ Outstanding																210,000,000
Receivables recorded for beneficial interests in decommissioning trust funds																						$ 1,500,000,000
Asset Retirement Obligation			6,706,800,000				$ 4,790,200,000									6,185,800,000	6,706,800,000	4,790,200,000
Decommissioning Fund Investments			5,723,897,000													7,211,993,000	5,723,897,000
Gain on sale of asset																16,270,000	0	154,037,000
Asset Write-Offs, Impairments, And Related Charges																357,251,000	2,835,637,000	2,104,906,000
Decommissioning																405,685,000	327,425,000	280,272,000
Assets, Fair Value Disclosure			7,311,000,000													8,414,000,000	7,311,000,000
Entergy Arkansas [Member]
Business Acquisition [Line Items]
Asset Retirement Obligation			924,400,000				872,300,000									981,200,000	924,400,000	872,300,000
Decommissioning Fund Investments			834,735,000													944,890,000	834,735,000
Decommissioning																56,860,000	53,610,000	50,414,000
Assets, Fair Value Disclosure			851,300,000													954,000,000	851,300,000
Entergy New Orleans [Member]
Business Acquisition [Line Items]
Asset Retirement Obligation			2,900,000				2,700,000									3,100,000	2,900,000	2,700,000
Assets, Fair Value Disclosure			194,600,000													118,300,000	194,600,000
Entergy Louisiana [Member]
Business Acquisition [Line Items]
Asset Write-Offs, Impairments, And Related Charges								$ 16,000,000
Payments to Acquire Property, Plant, and Equipment						$ (474,000,000)
Asset Retirement Obligation			1,082,700,000				1,027,900,000									1,140,500,000	1,082,700,000	1,027,900,000
Decommissioning Fund Investments			1,140,707,000													1,312,073,000	1,140,707,000
Decommissioning																49,457,000	46,944,000	43,445,000
Assets, Fair Value Disclosure			1,632,500,000													1,643,900,000	1,632,500,000
Entergy Mississippi [Member]
Business Acquisition [Line Items]
Asset Retirement Obligation			8,700,000				8,300,000									9,200,000	8,700,000	8,300,000
Assets, Fair Value Disclosure			114,100,000													38,600,000	114,100,000
India Point Three [Member]
Business Acquisition [Line Items]
Future payment to NYPA for power sold | $ / MWh																				6.59
Annual cap for future payment to NYPA for power sold																				$ 48,000,000
FitzPatrick [Member]
Business Acquisition [Line Items]
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property		$ 16,000,000
Future payment to NYPA for power sold | $ / MWh																				3.91
Annual cap for future payment to NYPA for power sold																				$ 24,000,000
Asset Retirement Obligation			714,300,000				0									0	714,300,000	0
Decommissioning Fund Investments		805,000,000	785,000,000						$ 805,000,000								785,000,000				$ 793,000,000
Entergy Nuclear Vermont Yankee [Member]
Business Acquisition [Line Items]
Line of credit facility, maximum borrowing capacity	$ 145,000,000															145,000,000
Proceeds From Sale of Preferred Membership Units																1,000
Amount Drawn/ Outstanding																104,000,000
Net Book Value																123,000,000
Closing condition on market value of decommissioning trust fund investments																451,950,000
Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Asset Retirement Obligation			$ 3,827,400,000				$ 2,069,500,000									3,183,300,000	$ 3,827,400,000	$ 2,069,500,000
Palisades [Member]
Business Acquisition [Line Items]
Weighted Average Cost Of Capital Used In Asset Valuation			6.50%				7.50%										6.50%	7.50%
Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Asset Write-Offs, Impairments, And Related Charges																538,372,000	$ 2,835,637,000	$ 2,036,234,000
Decommissioning Trust Fair Values			$ 2,968,000,000													4,049,300,000	2,968,000,000
Asset Write-Offs, Impairments, And Related Charges																538,000,000	2,836,000,000
Impairment of Long-Lived Assets Held-For-Use, Net of Tax																$ 350,000,000	1,829,000,000
FitzPatrick [Member]
Business Acquisition [Line Items]
Weighted Average Cost Of Capital Used In Asset Valuation							7.50%											7.50%
Non-refundable signing fee paid upon agreement and assumption by Exelon of certain liabilities		10,000,000
Decommissioning Trust Fair Values		805,000,000							805,000,000
Other operation and maintenance expense reimbursement									98,000,000
Receivables recorded for beneficial interests in decommissioning trust funds			785,000,000														785,000,000
Asset Retirement Obligation		727,000,000	714,000,000						727,000,000								714,000,000
Proceeds from sale of business		110,000,000
FitzPatrick [Member] | Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Net Book Value		0							0
Palisades [Member] | Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Time period of PPA																			15 years
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																$ 28,000,000	13,000,000	$ 15,000,000
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	$ 6,000,000
Scenario, Forecast [Member] | Palisades [Member] | Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Price under PPA, upper range | $ / MWh											61.50
Pilgrim [Member] | Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Asset Write-Offs, Impairments, And Related Charges										$ 677,000,000
Carrying Value of Nuclear Plant										718,000,000
Asset Write-Offs, Impairments, And Related Charges										653,000,000
Asset Impairment Charges										24,000,000
After-Tax Asset Impairment Charge										438,000,000
Decommissioning										134,000,000
Assets, Fair Value Disclosure										65,000,000
Rhode Island State Energy Center [Member] | Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Capacity Of Power Plant Unit | MW							583
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property							$ 154,000,000
Proceeds from sale of business							490,000,000
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						$ 0
Union Power Station [Member] | Entergy Arkansas [Member]
Business Acquisition [Line Items]
Payments to Acquire Property, Plant, and Equipment						$ (237,323,000)
Power Blocks Purchased						1,000,000
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						1,000,000
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						2,000,000
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
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
Decommissioning																	392,000,000
Assets, Fair Value Disclosure			433,000,000														433,000,000
FitzPatrick [Member]
Business Acquisition [Line Items]
Capacity Of Power Plant Unit | MW					838
Cost of Reimbursable Expense		$ 8,000,000
Reimbursement Revenue									7,000,000
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
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]
Asset Write-Offs, Impairments, And Related Charges										965,000,000
Carrying Value of Nuclear Plant										742,000,000
Present Value Of The Difference Between The Stipulated Contract Amount For Decommissioning The Plants Less The Decommissioning Cost										335,000,000
Present Value Of The Difference Between The Stipulated Contract Amount For Decommissioning The Plants Less The Decommissioning Cost After Impairment										131,000,000
Change in Contract Amount For Decommissioning The Plants Less The Decommissioning Cost										204,000,000
Asset Write-Offs, Impairments, And Related Charges										713,000,000
Asset Impairment Charges										48,000,000
After-Tax Asset Impairment Charge										624,000,000
Assets, Fair Value Disclosure										$ 29,000,000
Palisades [Member] | Entergy Wholesale Commodities [Member]
Business Acquisition [Line Items]
Asset Write-Offs, Impairments, And Related Charges																	400,000,000
Carrying Value of Nuclear Plant			558,000,000				859,000,000										558,000,000	859,000,000
Asset Write-Offs, Impairments, And Related Charges																	352,000,000	396,000,000
Asset Impairment Charges																	48,000,000
After-Tax Asset Impairment Charge																	258,000,000
Decommissioning																	129,000,000	42,000,000
Assets, Fair Value Disclosure			$ 206,000,000				$ 463,000,000										$ 206,000,000	463,000,000
Impairment of Long-Lived Assets Held-For-Use, Net of Tax																		$ 256,000,000