Rate And Regulatory Matters (Narrative) (Details) - USD ($)	1 Months Ended			3 Months Ended		12 Months Ended				15 Months Ended
	Apr. 30, 2019	Jan. 31, 2019	Dec. 31, 2018	Mar. 31, 2019	Mar. 31, 2018	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				$ 25,462,000	$ 25,800,000
Deferred Fuel Cost			$ 27,251,000	19,209,000				$ 19,209,000	$ 27,251,000
Entergy Louisiana [Member]
Regulatory Assets [Line Items]
Deferred Fuel Cost			0	19,209,000				19,209,000	0
Entergy Louisiana [Member] | Revenue Subject to Refund [Member]
Regulatory Assets [Line Items]
LPSC staff recommended fuel adjustment clause refund including interest				7,300,000				7,300,000
Entergy Mississippi [Member]
Regulatory Assets [Line Items]
Deferred Fuel Cost			8,016,000	$ 0				0	8,016,000
Authorized return on common equity				6.94%
Public Utilities, Requested Rate Increase (Decrease), Amount									10,100,000
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						9,300,000
True-up to provision recorded to reflect change in formula rate plan revenues compared to allowed rate of return				$ 800,000				800,000
Entergy Mississippi [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount							$ 36,800,000
Entergy Texas [Member]
Regulatory Assets [Line Items]
Public Utilities, Requested Rate Increase (Decrease), Amount			2,700,000	3,200,000
Requested recovery of internal and external litigation expenses previously paid or incurred		$ 7,200,000
Entergy Texas [Member] | Subsequent Event [Member] | Minimum [Member]
Regulatory Assets [Line Items]
Recommended disallowance of requested recovery of expenses previously paid or incurred	$ 3,200,000
Entergy Texas [Member] | Subsequent Event [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			19,235,000	0				0	19,235,000
Energy Cost Recovery Rider Rate Per kWh								0.01882
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						35,100,000
True-up to provision recorded to reflect change in formula rate plan revenues compared to allowed rate of return				10,500,000				10,500,000
Entergy Arkansas [Member] | Subsequent Event [Member]
Regulatory Assets [Line Items]
Energy Cost Recovery Rider Rate Per kWh						$ 0.01462
System Energy [Member]
Regulatory Assets [Line Items]
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						$ 334,500,000
LPSC requested refund of cost of capital additions resulting from Grand Gulf sale-leaseback				$ 274,800,000				$ 274,800,000
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]
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%