Rate And Regulatory Matters (Narrative) (Details) - USD ($)	1 Months Ended										3 Months Ended		6 Months Ended		9 Months Ended	12 Months Ended					15 Months Ended		36 Months Ended
	Jul. 31, 2020	Jun. 30, 2020	May 31, 2020	Apr. 30, 2020	Mar. 31, 2020	Feb. 29, 2020	Oct. 31, 2019	Aug. 31, 2019	May 31, 2019	Jan. 31, 2018	Oct. 31, 2020	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2020	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	Sep. 30, 2019
Regulatory Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use													$ 11,735,000	$ 26,684,000
Public Utilities, Requested Rate Increase (Decrease), Amount																				$ 7,300,000
Public Utilities Temporary Rate Increase Amount				$ 24,300,000
Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Return on Equity, Percentage			9.80%																	9.66%
Rate Increase Included in Formula Rate Plan																				$ 103,000,000
Formula rate plan increase excluding Tax Cuts and Jobs Act Credits									$ 109,500,000
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		10,700,000										$ 10,700,000	10,700,000
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		6,000,000										6,000,000	6,000,000
Vegetation management cost rider												22,000,000
Cap on 2019 retail revenues																				2.00%
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
Recovery of first-year revenue requirement for certain costs of Choctaw Generating Station																		59,000,000
Public Utilities, Requested Rate Increase (Decrease), Amended, Amount																		$ 23,800,000
Entergy New Orleans [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount						$ 45,000,000
Regulatory asset related to costs associated with COVID-19 pandemic		4,800,000										4,800,000	4,800,000
Opportunity Sales Refund to be Redirected to Cares Program		7,000,000										7,000,000	7,000,000
Non-Securitized Storm Reserves Reallocated to Cares Program		15,000,000										15,000,000	15,000,000
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] | Subsequent Event [Member]
Regulatory Assets [Line Items]
public utilities proposed customer credits	$ 100
Entergy New Orleans [Member] | Subsequent Event [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		4,100,000										4,100,000	4,100,000
Entergy Texas [Member] | Minimum [Member]
Regulatory Assets [Line Items]
Intervenor recommended disallowance of revenue requirement			$ 300,000
Entergy Texas [Member] | Maximum [Member]
Regulatory Assets [Line Items]
Intervenor recommended disallowance of revenue requirement		4,100,000
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																				9.07%
Projected Revenue Deficiency																				$ 23,900,000
Energy Cost Recovery Rider Rate Per kWh																			$ 0.01462
Entergy Arkansas [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Return on Equity, Percentage	9.75%															7.84%
Projected Revenue Deficiency																$ 80,700,000
Rate Increase Included in Formula Rate Plan																$ 104,600,000
Energy Cost Recovery Rider Rate Per kWh																	$ 0.01052
Annual revenue constraint per rate class percentage	4.00%
Reduced proposed increase in revenue requirement to comply with annual revenue constraint	$ 74,300,000
Refund to customers, plus interest, associated with recalculated bandwidth remedy	13,700,000
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
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		179,000,000										179,000,000	179,000,000
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		409,000,000										409,000,000	409,000,000
Interest Portion of rate reduction for ADIT associated with uncertain tax positions resulting from Grand Gulf sale-leaseback		101,000,000										101,000,000	101,000,000
Refund related to depreciation expense adjustments		$ 19,000,000										$ 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%
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]
Additional unprotected excess ADIT related to uncertain decommissioning tax deduction	$ 147,000,000
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
Transmission Cost Recovery Factor Rider [Member] | Entergy Texas [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount								$ 19,400,000