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, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	$ 20,769	$ 21,300
Amortization of loss	(110,185)	(83,246)
Settlement loss	(243)	(25,155)
Total	(89,659)	(87,101)
Non-Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	(231)	(198)
Amortization of loss	(3,326)	(2,192)
Settlement loss	0	(1,697)
Total	(3,557)	(4,087)
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	0	0
Amortization of loss	(105,853)	(82,284)
Settlement loss	(243)	(23,458)
Total	(106,096)	(105,742)
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	21,000	21,498
Amortization of loss	(1,006)	1,230
Settlement loss	0	0
Total	19,994	22,728
Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Settlement loss	36,900
Entergy Louisiana [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	6,179	7,349
Amortization of loss	(1,557)	(2,106)
Settlement loss	(243)
Total	4,379	5,243
Entergy Louisiana [Member] | Non-Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	0	0
Amortization of loss	(3)	(6)
Settlement loss	0
Total	(3)	(6)
Entergy Louisiana [Member] | Pension Plans, Defined Benefit [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	0	0
Amortization of loss	(2,001)	(2,795)
Settlement loss	(243)
Total	(2,244)	(2,795)
Entergy Louisiana [Member] | Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Amortization of prior service cost	6,179	7,349
Amortization of loss	447	695
Settlement loss	0
Total	6,626	$ 8,044
Entergy Louisiana [Member] | Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Settlement loss	8,100
Entergy Arkansas [Member] | Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Settlement loss	21,100
Entergy Mississippi [Member] | Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Settlement loss	3,400
Entergy Texas [Member] | Qualified Pension Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Settlement loss	$ 4,300