Rate And Regulatory Matters (Narrative) (Details) - USD ($)	1 Months Ended				3 Months Ended		9 Months Ended	12 Months Ended				15 Months Ended		36 Months Ended
	Apr. 30, 2020	Mar. 31, 2020	Feb. 29, 2020	Aug. 31, 2019	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2020	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Jul. 27, 2019	Apr. 23, 2018	Mar. 31, 2019	Oct. 31, 2019	Sep. 30, 2019
Regulatory Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use					$ 4,962,000	$ 25,462,000
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]
Public Utilities, Requested Rate Increase (Decrease), Amount											$ 7,300,000
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 Temporary Rate Increase Amount	$ 24,300,000
Cap on 2019 retail revenues									2.00%
Entergy New Orleans [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount			$ 45,000,000
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
Entergy Arkansas [Member]
Regulatory Assets [Line Items]
Energy Cost Recovery Rider Rate Per kWh										$ 0.01462
Entergy Arkansas [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Energy Cost Recovery Rider Rate Per kWh								$ 0.01052
System Energy [Member]
Regulatory Assets [Line Items]
Requested return on equity based on alternative methodology													10.26%
LPSC requested authorized return on equity for System Energy in return on equity proceeding												7.89%	8.44%
APSC/MPSC requested authorized return on equity for System Energy in return on equity proceeding												8.01%	8.41%
FERC requested authorized return on equity for System Energy in return on equity proceeding, rebuttal												8.66%	9.22%
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
Interest Portion of LPSC requested rate reduction for ADIT associated with uncertain tax positions resulting from Grand Gulf sale-leaseback		$ 170,000,000			170,000,000					170,000,000
Rate reduction for ADIT associated with uncertain tax positions resulting from Grand Gulf sale-leaseback		397,000,000			397,000,000					397,000,000
Interest Portion of rate reduction for ADIT associated with uncertain tax positions resulting from Grand Gulf sale-leaseback		96,000,000			96,000,000					96,000,000
Refund related to depreciation expense adjustments		18,000,000			$ 18,000,000					$ 18,000,000
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]
Remaining NBV of Leased Assets	70,000,000
Refund of Lease Payments	$ 17,200,000
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
Grand Gulf [Member] | System Energy [Member]
Regulatory Assets [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage					11.50%
Natural Gas [Member] | Entergy New Orleans [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount			3,000,000
Electricity [Member] | Entergy New Orleans [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount			42,000,000
Rider reductions included in decreased rates			$ 29,000,000