Income Taxes (Narrative) (Details) - USD ($) $ in Thousands		1 Months Ended				3 Months Ended			12 Months Ended
	Jan. 01, 2018	Jan. 31, 2024	Oct. 31, 2023	Mar. 31, 2023	May 31, 2022	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2020	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Line Items]
Operating Loss Carryforwards, Valuation Allowance						$ 372,000			$ 372,000	$ 372,000
Unrecognized Tax Benefits that Would Impact Effective Tax Rate						1,899,000			1,899,000	3,254,000	$ 2,256,000
Remaining Balances Of Unrecognized Tax Benefits						541,000			541,000	3,140,000	3,504,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued						39,000			39,000	50,000	52,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense										8,000
Deferred Tax Assets, Valuation Allowance						372,119			372,119	372,017
Regulatory Liability, Noncurrent						3,116,926			$ 3,116,926	2,324,590
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%								21.00%				35.00%		35.00%
Regulatory Liability For Income Taxes - Current and Non Current						1,000,000			$ 1,000,000	1,300,000
Net operating loss carryforwards						2,857,908			2,857,908	2,065,149
Deferred Tax Assets, Net of Valuation Allowance						4,612,667			4,612,667	3,643,187
Reduction of income tax expense due reversal of UTPs									288,000
Unrecognized Tax Expense, Income Tax Penalties and Interest Expense									(11,000)		(4,000)
Deferred Income Tax Assets, Net						16,367			16,367	84,100
Deferred Income Tax Liabilities, Net						4,245,982			$ 4,245,982	4,818,837
Reduction of income tax expense				$ 129,000	$ 283,000
Excise tax enacted by inflation reduction act on buyback of public company stock									1.00%
Reduction to Regulatory Liability due to return of unprotected excess ADIT						0			$ 0	53,000
Unrecognized Tax Benefits						2,439,910		$ 5,699,339	2,439,910	6,393,599	5,759,968	$ 5,699,339
Decrease in operating loss carryforward						8,000,000			8,000,000
Tax liability resulting from audit adjustments						79,000			79,000
Interest accrued on taxes in excess of deposits						13,000			13,000
Reversal of interest expense related to the allowance of previously unrecognized tax benefits						24,000			24,000
Increase (Reduction) in income tax resulting from Entergy Wholesale Commodities restructuring								9,200
State of Louisiana Enacted Tax Legislation 2021 [Member]
Income Taxes [Line Items]
Deferred Income Tax Assets, Net											27,000
Entergy Arkansas [Member]
Income Taxes [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate						57,200			57,200	377,900	262,100
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued						7,800			7,800	4,300	2,700
Regulatory Liability, Noncurrent						759,181			759,181	475,758
Regulatory Liability For Income Taxes - Current and Non Current						26,000		21,000	26,000	15,000	$ 11,000	$ 21,000
Net operating loss carryforwards						94,321			94,321	10,491
Deferred Tax Assets, Net of Valuation Allowance						544,974			544,974	$ 426,708
Reduction to income tax expense									9,000
Deductible temporary difference related to election to mark-to-market certain power purchase and sales agreements									$ 2,000,000
State Effective Income Tax Rate, Percent							5.30%		5.10%	5.90%	6.20%	6.50%
Deferred Income Tax Liabilities, Net						1,437,053			$ 1,437,053	$ 1,498,234
Unrecognized Tax Benefits, Interest on Income Taxes Expense									3,500	1,600	$ 400
Provision for uncertain tax position						21,000
Reduction of income tax expense from the reversal of provisions for uncertain tax positions									156,000
Unrecognized Tax Benefits						69,197		1,364,635	69,197	1,452,819	1,408,494	$ 1,364,635
Decommissioning liability in COGS						102,000			102,000
Accrued increase to tax expense from the settlement of mark-to-market tax position						40,000			40,000
Decrease in operating loss carryforward						4,000,000			4,000,000
Regulatory asset for income tax associated with deficient ADIT						35,000			35,000
Reduction to income tax expense due to method of accounting														$ 1,800,000
Miscellaneous excess ADIT as result of 2016-2018 audit resolution						5,000			5,000
Entergy Louisiana [Member]
Income Taxes [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate						862,500			862,500	720,800	66,300
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued						1,500			1,500	4,100	3,700
Regulatory Liability, Noncurrent						1,407,689			1,407,689	1,037,962
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent												21.00%
Net operating loss carryforwards						459,553			459,553	307,175
Deferred Tax Assets, Net of Valuation Allowance						1,240,317			1,240,317	972,964
Reduction to income tax expense									42,000
Deductible temporary difference related to election to mark-to-market certain power purchase and sales agreements									2,000,000
Reduction of income tax expense due reversal of UTPs									132,000
Unrecognized Tax Expense, Income Tax Penalties and Interest Expense									(2,600)
Deferred Income Tax Liabilities, Net						2,391,442			2,391,442	2,374,878
Unrecognized Tax Benefits, Interest on Income Taxes Expense										400	300
Reduction of income tax expense				133,000	290,000
Regulatory charge recorded as a result of reduction in income tax expense				103,000	224,000		$ 103,000
Regulatory charge recorded as a result of reduction in income tax expense, net of tax				$ 76,000	$ 165,000		$ 76,000
Reduction to Regulatory Liability due to return of unprotected excess ADIT										25,000
Unrecognized Tax Benefits						864,043		640,295	864,043	$ 1,350,836	$ 604,628	$ 640,295
Decrease in operating loss carryforward						1,000,000			1,000,000
Regulatory charge to reflect credits expected to be provided to customers as a result of the resolution of the 2016-2018 IRS audit, net of tax									28,000
Regulatory asset for income tax associated with deficient ADIT						2,000			2,000
Entergy Louisiana [Member] | Excess accumulated deferred income taxes as a result of the Tac Cuts and Jobs Act [Member]
Income Taxes [Line Items]
Increase (Decrease) in Regulatory Assets and Liabilities			$ 106,000
Entergy Louisiana [Member] | State of Louisiana Enacted Tax Legislation 2021 [Member]
Income Taxes [Line Items]
State Effective Income Tax Rate, Percent										7.50%	8.00%
Reduction in deferred income tax expense											$ 6,000
Increase in state tax rate											0.85%
Deferred Income Tax Liabilities, Net											$ 77,000
Entergy Mississippi [Member]
Income Taxes [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate						1,000			1,000	$ 151,200	51,700
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued						2,100			2,100	3,100	2,400
Regulatory Liability, Noncurrent						33,696			33,696	79,865
Net operating loss carryforwards						8,375			8,375	10,140
Deferred Tax Assets, Net of Valuation Allowance						85,427			85,427	89,483
Deductible temporary difference related to election to mark-to-market certain power purchase and sales agreements									2,000,000
Unrecognized Tax Expense, Income Tax Penalties and Interest Expense									(1,000)
Deferred Income Tax Liabilities, Net						821,744			821,744	780,030
Unrecognized Tax Benefits, Interest on Income Taxes Expense										700	500
Reduction of income tax expense from the reversal of provisions for uncertain tax positions									1,000
Unrecognized Tax Benefits						5,653		549,717	5,653	547,548	549,569	549,717
Decrease in operating loss carryforward						2,000,000			2,000,000
Regulatory asset for income tax associated with deficient ADIT						3,000			3,000
Increase to income tax expense									(2,000)
Entergy New Orleans [Member]
Income Taxes [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate						18,200			18,200	310,700	228,600
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued						600			600	6,400	5,200
Regulatory Liability, Noncurrent						90,434			90,434	20,735
Net operating loss carryforwards						26,227			26,227	12,146
Deferred Tax Assets, Net of Valuation Allowance						97,833			97,833	79,887
Reduction to income tax expense									2,000
Deductible temporary difference related to election to mark-to-market certain power purchase and sales agreements									1,000,000
Reduction of income tax expense due reversal of UTPs									139,000
Unrecognized Tax Expense, Income Tax Penalties and Interest Expense									(5,800)
Deferred Income Tax Liabilities, Net						195,615			195,615	385,259
Unrecognized Tax Benefits, Interest on Income Taxes Expense										1,200	1,300
Reduction to Regulatory Liability due to return of unprotected excess ADIT										1,000
Reduction of income tax expense from the reversal of provisions for uncertain tax positions									6,000
Reduction of income tax expense from the reversal of a tax gain									39,000
Unrecognized Tax Benefits						19,331		639,546	19,331	638,726	639,497	639,546
Decrease in operating loss carryforward						1,000,000			1,000,000
Regulatory charge to reflect credits expected to be provided to customers as a result of the resolution of the 2016-2018 IRS audit, net of tax									44,000
Entergy New Orleans [Member] | State of Louisiana Enacted Tax Legislation 2021 [Member]
Income Taxes [Line Items]
Reduction in deferred income tax expense											2,000
Deferred Income Tax Liabilities, Net											8,000
Entergy Texas [Member]
Income Taxes [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate						2,900			2,900	3,300	2,600
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued						0			0	1,100	1,100
Regulatory Liability, Noncurrent						43,013			43,013	45,247
Net operating loss carryforwards						61			61	27,620
Deferred Tax Assets, Net of Valuation Allowance						43,590			43,590	77,423
Reduction to income tax expense									2,000
Deductible temporary difference related to election to mark-to-market certain power purchase and sales agreements												2,500,000
Unrecognized Tax Expense, Income Tax Penalties and Interest Expense									(1,100)
Deferred Income Tax Liabilities, Net						814,905			814,905	744,227
Unrecognized Tax Benefits, Interest on Income Taxes Expense										0	200
Reduction to Regulatory Liability due to return of unprotected excess ADIT										27,000
Unrecognized Tax Benefits						415,205		521,932	415,205	389,366	552,295	521,932
System Energy [Member]
Income Taxes [Line Items]
Unrecognized Tax Benefits that Would Impact Effective Tax Rate						3,100			3,100	2,500	1,700
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued						1,900			1,900	1,900	12,100
Regulatory Liability, Noncurrent						782,912			782,912	665,024
Net operating loss carryforwards						35,089			35,089	20,639
Deferred Tax Assets, Net of Valuation Allowance						317,576			317,576	294,270
Reduction to income tax expense									1,000
Unrecognized Tax Expense, Income Tax Penalties and Interest Expense										(10,200)
Deferred Income Tax Liabilities, Net						405,744			405,744	376,070
Unrecognized Tax Benefits, Interest on Income Taxes Expense									0		200
Unrecognized Tax Benefits						14,301		$ 21,652	14,301	23,702	$ 23,356	$ 21,652
Decrease in operating loss carryforward						40,000			40,000
Subsequent Event [Member] | Entergy Arkansas [Member]
Income Taxes [Line Items]
State Effective Income Tax Rate, Percent		4.80%
Customer sharing from resolution of the 2016-2018 IRS audit [Member]
Income Taxes [Line Items]
Regulatory Liability, Noncurrent						98,000			98,000	0
Customer sharing from resolution of the 2016-2018 IRS audit [Member] | Entergy Louisiana [Member]
Income Taxes [Line Items]
Regulatory Liability, Noncurrent						38,000			38,000	0
Customer sharing from resolution of the 2016-2018 IRS audit [Member] | Entergy New Orleans [Member]
Income Taxes [Line Items]
Regulatory Liability, Noncurrent						$ 60,000			$ 60,000	$ 0