Income Taxes (Narrative) (Details) - USD ($)		1 Months Ended			3 Months Ended								9 Months Ended	12 Months Ended
	Jan. 01, 2018	Jun. 30, 2018	Aug. 31, 2008	Jul. 31, 2008	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2017	Mar. 31, 2017	Jun. 30, 2016	Dec. 31, 2015	Sep. 30, 2019	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Taxes [Line Items]
Valuation allowance on the deferred tax assets related to state net operating loss carryovers					$ 303,000,000		$ 244,000,000									$ 303,000,000	$ 244,000,000
Unrecognized tax benefits if recognized, would lower the effective income tax rates					2,421,000,000		2,161,000,000									2,421,000,000	2,161,000,000	$ 1,462,000,000
Remaining balances of unrecognized tax benefits, effective income tax rates					4,962,000,000		5,020,000,000									4,962,000,000	5,020,000,000	3,410,000,000
Accrued income tax interest and penalties					48,000,000		44,000,000									48,000,000	44,000,000	38,000,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense																4,000,000	7,000,000	8,000,000
Deferred Income Taxes and Tax Credits																193,950,000	(256,848,000)	$ 529,053,000
Deferred Tax Assets, Valuation Allowance					303,307,000		243,726,000									303,307,000	243,726,000
Regulatory Liability, Noncurrent					1,961,005,000		1,620,254,000									1,961,005,000	$ 1,620,254,000
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%																35.00%	35.00%
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount																24,000,000
Regulatory Liability For Income Taxes - Current and Non Current					1,700,000,000		2,100,000,000									1,700,000,000	$ 2,100,000,000
Deferred tax asset operating loss carryforward EUHC re-consolidation													$ 41,000,000
Net operating loss carryforwards					1,133,197,000		628,165,000									1,133,197,000	628,165,000
Deferred Tax Assets, Net of Valuation Allowance					3,769,302,000		3,247,555,000									3,769,302,000	3,247,555,000
Increase (Reduction) in income tax resulting from Entergy Wholesale Commodities restructuring																173,725,000	0	$ 373,277,000
Effective Income Tax Rate Reconciliation, Fitzpatrick Disposition, Amount																0	0	44,344,000
Utility Restructuring Nuclear Decommissioning Liability Effect							165,000,000
Utility Restructuring State Income Tax Effect							5,000,000
Annual Limit on Deduction for Compensation of Certain Covered Employees	$ 1,000,000
Regulatory Liability For Income Taxes Net					1,633,159,000		1,817,021,000									1,633,159,000	1,817,021,000
Limit on Annual Net Operating Loss as a Percent of Annual Taxable Income	80.00%
Net Decrease in Deferred Tax Assets Related to Excess ADIT																		560,000,000
Utility Restructuring							170,000,000									0	169,918,000	0
Discontinued Operation, Tax Effect of Discontinued Operation						$ 29,000,000
Entergy Arkansas [Member]
Income Taxes [Line Items]
Unrecognized tax benefits if recognized, would lower the effective income tax rates					203,300,000		85,400,000									203,300,000	85,400,000	2,600,000
Accrued income tax interest and penalties					3,100,000		1,700,000									3,100,000	1,700,000	1,600,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense																1,400,000	200,000	200,000
Deferred Income Taxes and Tax Credits																94,368,000	129,524,000	67,711,000
Regulatory Liability, Noncurrent					559,555,000		402,668,000									559,555,000	402,668,000
Regulatory Liability For Income Taxes - Current and Non Current													$ 25,000,000
Net operating loss carryforwards					112,658,000		6,338,000									112,658,000	6,338,000
Deferred Tax Assets, Net of Valuation Allowance					471,869,000		353,122,000									471,869,000	353,122,000
Noncash Capital Contribution from Parent							94,000,000										94,335,000
Change in accounting method for tax purposes, effect of change on taxable income							2,200,000,000
Accrued deductible temporary difference related to election to mark-to-market certain power purchase and sales agreements							2,100,000,000										2,100,000,000
Regulatory Liability For Income Taxes Net					478,174,000		505,748,000									478,174,000	505,748,000
Income Tax Expense(Benefit) Related to Excess ADIT																		3,000,000
State Effective Income Tax Rate, Percent													6.50%
Entergy Louisiana [Member]
Income Taxes [Line Items]
Unrecognized tax benefits if recognized, would lower the effective income tax rates					556,300,000		594,000,000.0									556,300,000	594,000,000.0	575,800,000
Accrued income tax interest and penalties					14,200,000		17,900,000									14,200,000	17,900,000	14,100,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense																(3,700,000)	3,800,000	5,700,000
Regulatory Liabilities					2,400,000		18,800,000									2,400,000	18,800,000
Deferred Income Taxes and Tax Credits																196,533,000	174,063,000	575,804,000
Regulatory Liability, Noncurrent					794,140,000		748,784,000									794,140,000	748,784,000
Tax benefits related to Hurricane Katrina and Hurricane Rita contingent sharing obligation		$ 52,000,000
Net operating loss carryforwards					65,178,000		20,118,000									65,178,000	20,118,000
Deferred Tax Assets, Net of Valuation Allowance					618,692,000		649,530,000									618,692,000	649,530,000
Change in accounting method for tax purposes, effect of change on taxable income												$ 2,200,000,000
Deductible temporary difference related to election to mark-to-market certain power purchase and sales agreements																			$ 2,200,000,000
Regulatory Liability For Income Taxes Net					500,083,000		581,001,000									500,083,000	581,001,000
Income Tax Expense(Benefit) Related to Excess ADIT																		(217,000,000)
Entergy Mississippi [Member]
Income Taxes [Line Items]
Unrecognized tax benefits if recognized, would lower the effective income tax rates					1,900,000		1,500,000									1,900,000	1,500,000	0
Accrued income tax interest and penalties					1,700,000		1,200,000									1,700,000	1,200,000	1,000,000.0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense																500,000	200,000	200,000
Deferred Income Taxes and Tax Credits																32,547,000	56,502,000	84,816,000
Regulatory Liability, Noncurrent					21,512,000		33,622,000									21,512,000	33,622,000
Net operating loss carryforwards					21,492,000		4,896,000									21,492,000	4,896,000
Deferred Tax Assets, Net of Valuation Allowance					92,959,000		97,556,000									92,959,000	97,556,000
Accrued deductible temporary difference related to election to mark-to-market certain power purchase and sales agreements							1,900,000,000										1,900,000,000
Regulatory Liability For Income Taxes Net					236,988,000		246,402,000									236,988,000	246,402,000
Income Tax Expense(Benefit) Related to Excess ADIT																		(3,000,000)
Entergy New Orleans [Member]
Income Taxes [Line Items]
Unrecognized tax benefits if recognized, would lower the effective income tax rates					242,700,000		246,200,000									242,700,000	246,200,000	31,700,000
Accrued income tax interest and penalties					4,700,000		2,700,000									4,700,000	2,700,000	2,100,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense																2,000,000.0	600,000	600,000
Deferred Income Taxes and Tax Credits																21,350,000	24,548,000	64,036,000
Net operating loss carryforwards					5,056,000		480,000									5,056,000	480,000
Deferred Tax Assets, Net of Valuation Allowance					69,138,000		79,315,000									69,138,000	79,315,000
Deductible temporary difference related to election to mark-to-market certain power purchase and sales agreements																		1,100,000,000
Regulatory Liability For Income Taxes Net					49,090,000		60,249,000									49,090,000	60,249,000
Income Tax Expense(Benefit) Related to Excess ADIT																		(6,000,000)
Entergy Texas [Member]
Income Taxes [Line Items]
Unrecognized tax benefits if recognized, would lower the effective income tax rates					5,700,000		5,100,000									5,700,000	5,100,000	4,400,000
Accrued income tax interest and penalties					1,100,000		900,000									1,100,000	900,000	400,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense																200,000	500,000	(800,000)
Deferred Income Taxes and Tax Credits																20,143,000	(39,545,000)	42,119,000
Regulatory Liability, Noncurrent					42,085,000		47,884,000									42,085,000	47,884,000
Net operating loss carryforwards					0		261,000									0	261,000
Deferred Tax Assets, Net of Valuation Allowance					65,293,000		90,124,000									65,293,000	90,124,000
Regulatory Liability For Income Taxes Net					225,980,000		264,623,000									225,980,000	264,623,000
Income Tax Expense(Benefit) Related to Excess ADIT																		(3,000,000)
System Energy [Member]
Income Taxes [Line Items]
Unrecognized tax benefits if recognized, would lower the effective income tax rates					0		0									0	0	0
Accrued income tax interest and penalties					14,500,000		13,200,000									14,500,000	13,200,000	8,500,000
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense																1,300,000	4,700,000	4,800,000
Regulatory Liabilities							55,600,000										55,600,000
Deferred Income Taxes and Tax Credits																95,000	24,040,000	7,827,000
Regulatory Liability, Noncurrent					533,415,000		381,887,000									533,415,000	381,887,000
Net operating loss carryforwards					0		0									0	0
Deferred Tax Assets, Net of Valuation Allowance					293,186,000		268,255,000									293,186,000	268,255,000
Change in accounting method for tax purposes, effect of change on taxable income												$ 1,200,000,000
Regulatory Liability For Income Taxes Net					142,845,000		158,998,000									142,845,000	158,998,000
Income Tax Expense(Benefit) Related to Excess ADIT																		$ 0
Entergy Wholesale Commodities [Member]
Income Taxes [Line Items]
Increase (Reduction) in income tax resulting from Entergy Wholesale Commodities restructuring					156,000,000				$ 373,000,000		$ 238,000,000					19,000,000
Reduction of Income Tax Expense, Net of Unrecognized Tax Benefits, Resulting From Tax Election								$ 107,000,000
Reduction to income tax expense					174,000,000
Tax Adjustments, Settlements, and Unusual Provisions								$ 23,000,000
Change in accounting method for tax purposes, effect of change on taxable income					18,000,000
Effective Income Tax Rate Reconciliation, Fitzpatrick Disposition, Amount										$ 44,000,000
Hurricane Rita [Member] | Entergy Gulf States Louisiana [Member]
Income Taxes [Line Items]
Proceeds from LURC			$ 274,700,000
Proceed from loan by LCDA to corporation LURC			$ 274,700,000
Hurricane Rita [Member] | Entergy Louisiana [Member]
Income Taxes [Line Items]
Proceeds from LURC				$ 679,000,000
Proceed from loan by LCDA to corporation LURC				$ 679,000,000
Subsequent Event [Member] | Entergy Arkansas [Member]
Income Taxes [Line Items]
State Effective Income Tax Rate, Percent														5.90%	6.20%
Reduction to Effective Income Tax Rate At Combined Federal and State Income Tax Rate														0.50%
Internal Restructuring Guaranteed Credits to Customers [Member]
Income Taxes [Line Items]
Regulatory Liability, Noncurrent					33,000,000.0		39,600,000									33,000,000.0	39,600,000
Regulatory Liability Net Of Tax							30,000,000										30,000,000
Internal Restructuring Guaranteed Credits to Customers [Member] | Entergy Arkansas [Member]
Income Taxes [Line Items]
Regulatory Liability, Noncurrent					$ 33,000,000.0		$ 39,600,000									$ 33,000,000.0	$ 39,600,000
Preferred Stock, Five Point Three Seven Five Percent, Series A [Member] | Entergy Texas [Member]
Income Taxes [Line Items]
Preferred Stock, Value, Issued													$ 35,000,000
Preferred Stock, Dividend Rate, Percentage													5.375%
Preferred Stock, Liquidation Preference Per Share					$ 25								$ 25			$ 25