Rate And Regulatory Matters (Narrative) (Details) - USD ($)	1 Months Ended															2 Months Ended	3 Months Ended		8 Months Ended	9 Months Ended			12 Months Ended					15 Months Ended		36 Months Ended
	Oct. 31, 2020	Sep. 30, 2020	Aug. 31, 2020	Jul. 31, 2020	Jun. 30, 2020	May 31, 2020	Apr. 30, 2020	Mar. 31, 2020	Feb. 29, 2020	Jan. 31, 2020	Oct. 31, 2019	Aug. 31, 2019	May 31, 2019	Jan. 31, 2019	Jan. 31, 2018	Aug. 31, 2020	Oct. 31, 2020	Mar. 31, 2020	Aug. 31, 2020	Dec. 31, 2020	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Jul. 27, 2019	Apr. 23, 2018	Mar. 31, 2019	Nov. 30, 2019
Regulatory Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use																					$ 16,117,000	$ 225,175,000
Public Utilities, Requested Rate Increase (Decrease), Amount																											$ 7,300,000
Public Utilities Temporary Rate Increase Amount							$ 24,300,000
Public Utilities, Property, Plant and Equipment, Construction Work in Progress		$ 3,477,386,000																			3,477,386,000						2,823,291,000
Hurricane Laura [Member]
Regulatory Assets [Line Items]
Regulatory Assets		205,000,000																			205,000,000
Public Utilities, Property, Plant and Equipment, Construction Work in Progress		1,295,000,000																			1,295,000,000
Minimum [Member] | Hurricane Laura [Member]
Regulatory Assets [Line Items]
Loss from Catastrophes			$ 1,500,000,000
Maximum [Member] | Hurricane Laura [Member]
Regulatory Assets [Line Items]
Loss from Catastrophes			1,700,000,000
Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Authorized return on common equity														2.69%
Public Utilities, Requested Return on Equity, Percentage						9.80%												9.66%
Rate Increase Included in Formula Rate Plan			2,800,000										$ 109,500,000	$ 2,800,000				$ 103,000,000
Bandwidth around midpoint of return on equity						6000.00%
public utilities proposed customer credits															$ 700,000
Proposed prospective reduction in the gas infrastructure rider															$ 200,000
Additional Requested Offset to Return of Unprotected Excess ADIT From Previously Deferred Operation and Maintenance Expenses					$ 800,000						$ 700,000
Regulatory asset related to costs associated with COVID-19 pandemic		27,400,000																			27,400,000
Public Utilities, Property, Plant and Equipment, Construction Work in Progress		1,800,139,000																			1,800,139,000						$ 1,383,603,000
Entergy Louisiana [Member] | Hurricane Laura [Member]
Regulatory Assets [Line Items]
Regulatory Assets		155,000,000																			155,000,000
Public Utilities, Property, Plant and Equipment, Construction Work in Progress		1,095,000,000.000																			1,095,000,000.000
Entergy Louisiana [Member] | Minimum [Member] | Hurricane Laura [Member]
Regulatory Assets [Line Items]
Loss from Catastrophes			1,250,000,000
Entergy Louisiana [Member] | Maximum [Member] | Hurricane Laura [Member]
Regulatory Assets [Line Items]
Loss from Catastrophes			1,400,000,000
Entergy Louisiana [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Projected increase in revenue requirement																				$ 108,000,000
Entergy Mississippi [Member]
Regulatory Assets [Line Items]
Authorized return on common equity																											6.75%
Projected Over-Recovery Energy Cost Recovery Rider																															$ 39,600,000
Interim adjustment to energy cost recovery rider credit to customers						$ 50,000,000
Regulatory asset related to costs associated with COVID-19 pandemic		10,400,000																			10,400,000
Recovery of first-year revenue requirement for certain costs of Choctaw Generating Station										$ 59,000,000
Vegetation management cost rider							22,000,000
Cap on 2019 retail revenues																											2.00%
Public Utilities, Property, Plant and Equipment, Construction Work in Progress		$ 169,686,000																			$ 169,686,000						$ 88,373,000
Entergy Mississippi [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Return on Equity, Percentage																									6.51%
Public Utilities, Requested Rate Increase (Decrease), Amount																									$ 24,600,000
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount																									$ 23,800,000
Entergy New Orleans [Member]
Regulatory Assets [Line Items]
Authorized return on common equity																					9.35%
Public Utilities, Requested Rate Increase (Decrease), Amount									$ 45,000,000
FERC staff argued over-recovery in depreciation expense for capital additions																					$ 2,200,000
public utilities proposed customer credits				$ 100
Regulatory asset related to costs associated with COVID-19 pandemic					8,400,000
Opportunity Sales Refund to be Redirected to Cares Program					7,000,000
Non-Securitized Storm Reserves Reallocated to Cares Program					15,000,000
Percent Equity in Proposed Common Equity Ratio																					51.00%
Percent Debt in Proposed Common Equity Ratio																					49.00%
Public Utilities, Property, Plant and Equipment, Disclosure of Composite Depreciation Rate for Plants in Service																					2.00%
Proposed recovery of certain rate case expenses																					$ 1,400,000
Proposed public utilities, property, plant, and equipment, disclosure of composite depreciation rate for plants in service																					3.00%
Common Equity Tier One Capital Ratio		50.00%																			50.00%
Public Utilities, Property, Plant and Equipment, Construction Work in Progress		$ 74,915,000																			$ 74,915,000						201,829,000
Credits to customer bills resulting from City Council Cares Program		1,900,000																			1,900,000
Entergy New Orleans [Member] | Electricity [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount									42,000,000
Rider reductions included in decreased rates									29,000,000
Entergy New Orleans [Member] | Natural Gas [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount									$ 3,000,000
Entergy New Orleans [Member] | Maximum [Member]
Regulatory Assets [Line Items]
public utilities proposed customer credits				$ 400
Entergy Texas [Member]
Regulatory Assets [Line Items]
Jurisdictional eligible fuel and purchased power expenses, net of credits																														$ 1,600,000,000
Fuel and purchased power under-recovery balance including interest																											25,800,000
Replacement power costs associated with generation outages																														2,000,000
Costs associated with the operation of the Spindletop natural gas storage facility																														$ 24,400,000
Non-specific disallowance of fuel and purchased power expenses					1,200,000
Regulatory asset related to costs associated with COVID-19 pandemic		8,700,000																			8,700,000
Public Utilities, Property, Plant and Equipment, Construction Work in Progress		1,003,217,000																			1,003,217,000						$ 760,354,000
Entergy Texas [Member] | Hurricane Laura [Member]
Regulatory Assets [Line Items]
Regulatory Assets		40,000,000																			40,000,000
Public Utilities, Property, Plant and Equipment, Construction Work in Progress		190,000,000																			190,000,000
Entergy Texas [Member] | Minimum [Member]
Regulatory Assets [Line Items]
Intervenor recommended disallowance of revenue requirement						$ 300,000
Entergy Texas [Member] | Minimum [Member] | Hurricane Laura [Member]
Regulatory Assets [Line Items]
Loss from Catastrophes			230,000,000
Entergy Texas [Member] | Maximum [Member]
Regulatory Assets [Line Items]
Intervenor recommended disallowance of revenue requirement					$ 4,100,000
Entergy Texas [Member] | Maximum [Member] | Hurricane Laura [Member]
Regulatory Assets [Line Items]
Loss from Catastrophes			$ 260,000,000
Entergy Texas [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
interim fuel refund																	$ 25,500,000
Entergy Arkansas [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Return on Equity, Percentage				9.75%																							9.07%
Projected Revenue Deficiency																											$ 23,900,000
Energy Cost Recovery Rider Rate Per kWh																										$ 0.01462
Annual revenue constraint per rate class percentage				4.00%
Reduced proposed increase in revenue requirement to comply with annual revenue constraint				$ 72,600,000
Regulatory asset related to costs associated with COVID-19 pandemic		6,100,000																			6,100,000
Refund to customers, plus interest, associated with recalculated bandwidth remedy				13,700,000
Public Utilities, Property, Plant and Equipment, Construction Work in Progress		337,458,000																			337,458,000						197,775,000
Entergy Arkansas [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Return on Equity, Percentage																							8.22%
Projected Revenue Deficiency																							$ 64,300,000
Rate Increase Included in Formula Rate Plan																							88,200,000
Energy Cost Recovery Rider Rate Per kWh																								$ 0.01052
Reduced proposed increase in revenue requirement to comply with annual revenue constraint	$ 74,300,000
Requested revenue increase resulting from settlement agreement	68,400,000
Reduced proposed revenue increase resulting from new methodology																							$ 900,000
System Energy [Member]
Regulatory Assets [Line Items]
LPSC requested authorized return on equity for System Energy in return on equity proceeding																												7.89%	8.44%
FERC requested authorized return on equity for System Energy in return on equity proceeding, rebuttal																												8.66%	9.22%
APSC/MPSC requested authorized return on equity for System Energy in return on equity proceeding																												8.01%	8.41%
Annual renewal lease payments on Grand Gulf Sale-Leaseback																					17,200,000
LPSC requested rate reduction for ADIT associated with uncertain tax positions resulting from Grand Gulf sale-leaseback											$ 512,000,000
FERC staff argued over-recovery in depreciation expense for capital additions												$ 32,000,000
Additional unprotected excess ADIT related to uncertain decommissioning tax deduction				147,000,000
Requested return on equity based on alternative methodology																													10.26%
Interest Portion of LPSC requested rate reduction for ADIT associated with uncertain tax positions resulting from Grand Gulf sale-leaseback		185,000,000																			185,000,000
Remaining NBV of Leased Assets							70,000,000
Refund of Lease Payments							$ 17,200,000
Rate reduction for ADIT associated with uncertain tax positions resulting from Grand Gulf sale-leaseback		422,000,000																			422,000,000
Interest Portion of rate reduction for ADIT associated with uncertain tax positions resulting from Grand Gulf sale-leaseback		106,000,000																			106,000,000
Refund related to depreciation expense adjustments		19,000,000																			19,000,000
First refund period requested authorized rate of return - LPSC					7.97%
First refund period requested authorized rate of return - MPSC and APSC					9.24%
First refund period requested authorized rate of return - FERC					9.49%
Second refund period requested authorized rate of return - LPSC					7.78%
Second refund period requested authorized rate of return - MPSC and APSC					9.15%
Second refund period requested authorized rate of return - FERC					9.09%
First refund period requested authorized rate of return					10.12%
Second refund period requested authorized rate of return					9.44%
Public Utilities, Property, Plant and Equipment, Construction Work in Progress		53,959,000																			$ 53,959,000						$ 164,996,000
Future nuclear decommissioning costs allowed by the IRS in cost of goods sold		$ 102,000,000
Percent of requested deduction allowed by IRS of uncertain decommissioning tax postion		10.00%																			10.00%
System Energy [Member] | Minimum [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Return on Equity, Percentage																												8.28%	8.57%
System Energy [Member] | Maximum [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Return on Equity, Percentage																												9.11%	9.52%
System Energy [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Proposed credit of excess accumulated deferred income taxes resulting from decommissioning uncertain tax position	17,800,000																$ 17,800,000
Grand Gulf [Member] | System Energy [Member]
Regulatory Assets [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage																					11.50%
Distribution Cost Recovery Factor Rider [Member] | Entergy Texas [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount								$ 23,600,000
Revenue increase resulting from incremental revenue								$ 20,400,000											$ 6,800,000
Distribution Cost Recovery Factor Rider [Member] | Entergy Texas [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	26,300,000
Revenue increase resulting from incremental revenue	16,300,000
Transmission Cost Recovery Factor Rider [Member] | Entergy Texas [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount												$ 19,400,000
Revenue increase resulting from incremental revenue																$ 31,600,000
Transmission Cost Recovery Factor Rider [Member] | Entergy Texas [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 51,000,000
FERC April 2020 Order [Member] | Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Payments to utility operating companies pursuant to FERC order					$ 2,300,000
FERC April 2020 Order [Member] | Entergy Mississippi [Member]
Regulatory Assets [Line Items]
Payments to utility operating companies pursuant to FERC order					200,000
FERC April 2020 Order [Member] | Entergy Texas [Member]
Regulatory Assets [Line Items]
Payments to utility operating companies pursuant to FERC order					$ 400,000
FERC April 2020 Order [Member] | Entergy Arkansas [Member]
Regulatory Assets [Line Items]
Payments to utility operating companies pursuant to FERC order				$ 1,500,000