Retirement, Other Postretirement Benefits, And Defined Contribution Plans Retirement, Other Postretirement Benefits, And Defined Contribution Plans (Reclassification Out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	$ 21,300	$ 21,700
Amortization of loss	(83,246)	(99,186)
Settlement loss	(25,155)	(3,207)
Total	(87,101)	(80,693)
Non-Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	(198)	(281)
Amortization of loss	(2,192)	(3,628)
Settlement loss	(1,697)	(2,379)
Total	(4,087)	(6,288)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	0	(398)
Amortization of loss	(82,284)	(87,828)
Settlement loss	(23,458)	(828)
Total	(105,742)	(89,054)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	21,498	22,379
Amortization of loss	1,230	(7,730)
Settlement loss	0	0
Total	22,728	14,649
Entergy Louisiana [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	7,349	7,735
Amortization of loss	(2,106)	(5,025)
Total	5,243	2,710
Entergy Louisiana [Member] | Non-Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	0	0
Amortization of loss	(6)	(7)
Total	(6)	(7)
Entergy Louisiana [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	0	0
Amortization of loss	(2,795)	(3,468)
Total	(2,795)	(3,468)
Entergy Louisiana [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	7,349	7,735
Amortization of loss	695	(1,550)
Total	$ 8,044	$ 6,185