Rate And Regulatory Matters (Narrative) (Details) - USD ($)		1 Months Ended						6 Months Ended		12 Months Ended					15 Months Ended
	Jul. 31, 2019	Aug. 31, 2019	Jun. 30, 2019	May 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Jul. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018	Jul. 27, 2019	Apr. 23, 2018
Regulatory Assets [Line Items]
Impairment of Long-Lived Assets Held-for-use								$ 26,684,000	$ 51,503,000
Deferred Fuel Cost			$ 8,685,000					8,685,000						$ 27,251,000
Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Deferred Fuel Cost			8,685,000					8,685,000						$ 0
Public Utilities, Requested Rate Increase (Decrease), Amount				$ 118,700,000
Rate Increase Included in Formula Rate Plan				109,500,000
Earned return on common equity														10.61%
Formula rate plan revenue decrease														$ 8,900,000
Entergy Louisiana [Member] | Revenue Subject to Refund [Member]
Regulatory Assets [Line Items]
LPSC staff recommended fuel adjustment clause refund including interest						$ 7,300,000
Entergy Mississippi [Member]
Regulatory Assets [Line Items]
Deferred Fuel Cost			0					$ 0						$ 8,016,000
Authorized return on common equity								6.93%						7.13%
Public Utilities, Requested Return on Equity, Percentage								6.94%
Public Utilities, Requested Rate Increase (Decrease), Amount														$ 10,100,000
Public Utilities, Approved Rate Increase (Decrease), Amount														$ 11,000,000
Earned return on common equity														7.81%
Monthly storm damage provision								$ 1,750,000
Authorized Storm Damage Reserve Balance			15,000,000					15,000,000
Balance At Which Storm Damage Accrual Will Return To Current Level				$ 10,000,000				10,000,000
Entergy Mississippi [Member] | Revenue Subject to Refund [Member]
Regulatory Assets [Line Items]
Provision recorded to reflect change in formula rate plan revenues compared to allowed rate of return														$ 9,300,000
True-up to provision recorded to reflect change in formula rate plan revenues compared to allowed rate of return			900,000					900,000					$ 800,000
Entergy Mississippi [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount												$ 36,800,000
Public Utilities, Approved Rate Increase (Decrease), Amount												32,800,000
Entergy New Orleans [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		$ 30,000,000
Entergy New Orleans [Member] | Subsequent Event [Member] | Electricity [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount		27,000,000
Entergy New Orleans [Member] | Subsequent Event [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] | Maximum [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Return on Equity, Percentage		10.50%
Entergy Texas [Member]
Regulatory Assets [Line Items]
Requested recovery of internal and external litigation expenses previously paid or incurred						$ 7,200,000
Entergy Texas [Member] | Minimum [Member]
Regulatory Assets [Line Items]
Recommended disallowance of requested recovery of expenses previously paid or incurred					$ 3,200,000
Entergy Texas [Member] | Maximum [Member]
Regulatory Assets [Line Items]
Recommended disallowance of requested recovery of expenses previously paid or incurred					$ 4,200,000
Entergy Arkansas [Member]
Regulatory Assets [Line Items]
Deferred Fuel Cost			0					0						19,235,000
Refund to Customers Credited Through Formula Rate Plan														46,600,000
Energy Cost Recovery Rider Rate Per kWh													$ 0.01882
Retail balance over-recovery														100,000
Receipts from utility operating companies pursuant to FERC order							$ 4,200,000
Entergy Arkansas [Member] | Revenue Subject to Refund [Member]
Regulatory Assets [Line Items]
Provision recorded to reflect change in formula rate plan revenues compared to allowed rate of return														35,100,000
True-up to provision recorded to reflect change in formula rate plan revenues compared to allowed rate of return			11,500,000					11,500,000
Entergy Arkansas [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Return on Equity, Percentage	9.75%
Public Utilities, Requested Rate Increase (Decrease), Amount	$ 15,300,000
Projected Revenue Deficiency										$ 61,900,000
Energy Cost Recovery Rider Rate Per kWh											$ 0.01462
System Energy [Member]
Regulatory Assets [Line Items]
FERC requested authorized return on equity for System Energy in return on equity proceeding																9.89%
LPSC requested authorized return on equity for System Energy in return on equity proceeding																7.81%
APSC/MPSC requested authorized return on equity for System Energy in return on equity proceeding																8.24%
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														$ 334,500,000
LPSC requested refund of cost of capital additions resulting from Grand Gulf sale-leaseback			274,800,000					$ 274,800,000
Ratepayer savings due to Grand Gulf sale-leaseback initial and renewal terms			$ 850,000,000
System Energy [Member] | Minimum [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Return on Equity, Percentage																10.10%
System Energy [Member] | Maximum [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Return on Equity, Percentage																10.70%
System Energy [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Public utilities requested return on equity percentage, median 2nd refund period															9.65%
Public utilities requested return on equity percentage, midpoint 2nd refund period															9.74%
Modified public utilities requested return on equity percentage based on benchmarks, median 2nd refund period															9.91%
Modified public utilities requested return on equity percentage based on benchmarks, midpoint 2nd refund period															10.30%
LPSC requested authorized return on equity for System Energy in return on equity proceeding															7.97%
APSC/MPSC requested authorized return on equity for System Energy in return on equity proceeding															8.41%
System Energy [Member] | Subsequent Event [Member] | Minimum [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Return on Equity, Percentage															10.32%
System Energy [Member] | Subsequent Event [Member] | Maximum [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Return on Equity, Percentage															10.69%
Grand Gulf [Member] | System Energy [Member]
Regulatory Assets [Line Items]
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage								11.50%
FERC May 2018 Order [Member] | Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Receipts from utility operating companies pursuant to FERC order							(23,000,000)
FERC May 2018 Order [Member] | Entergy Arkansas [Member]
Regulatory Assets [Line Items]
Receipts from utility operating companies pursuant to FERC order							$ 4,000,000
Distribution Cost Recovery Factor Rider [Member] | Entergy Texas [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount												3,200,000
Transmission Cost Recovery Factor Rider [Member] | Entergy Texas [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount												2,700,000
Public Utilities, Approved Rate Increase (Decrease), Amount												$ 2,700,000