Income Taxes (Schedule Of Estimated Tax Attributes Carryovers And Their Expiration Dates) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Capital losses, Carryover Amount	$ 21,291	$ 22,597
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Pre January 1, 2018	6,100,000
Operating losses, Carryover Amount	14,600,000
Federal [Member] | Entergy Arkansas [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Pre January 1, 2018	0
Operating losses, Carryover Amount	4,400,000
Tax credits, Carryover Amount	2,900
Federal [Member] | Entergy Louisiana [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Pre January 1, 2018	1,700,000
Operating losses, Carryover Amount	1,400,000
Tax credits, Carryover Amount	9,300
Federal [Member] | Entergy Mississippi [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Pre January 1, 2018	0
Operating losses, Carryover Amount	1,900,000
Tax credits, Carryover Amount	1,200
Federal [Member] | Entergy New Orleans [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Pre January 1, 2018	900,000
Operating losses, Carryover Amount	$ 300,000
Operating losses, Year(s) of expiration	Dec. 31, 2037
Tax credits, Carryover Amount	$ 14,800
Federal [Member] | Entergy Texas [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Pre January 1, 2018	0
Operating losses, Carryover Amount	2,700,000
Tax credits, Carryover Amount	2,600
Federal [Member] | System Energy [Member]
Operating Loss Carryforwards [Line Items]
Operating Loss Carryforwards, Pre January 1, 2018	0
Operating losses, Carryover Amount	0
Tax credits, Carryover Amount	1,300
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	19,700,000
Deferred Tax Assets, Charitable Contribution Carryforwards	449,000
State and Local Jurisdiction [Member] | Entergy Arkansas [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	4,500,000
Tax credits, Carryover Amount	0
State and Local Jurisdiction [Member] | Entergy Louisiana [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	4,000,000
Tax credits, Carryover Amount	0
State and Local Jurisdiction [Member] | Entergy Mississippi [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	2,000,000
Tax credits, Carryover Amount	0
State and Local Jurisdiction [Member] | Entergy New Orleans [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	1,300,000
Tax credits, Carryover Amount	0
State and Local Jurisdiction [Member] | Entergy Texas [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	0
Tax credits, Carryover Amount	$ 2,900
Tax Credit Carryforward, Expiration Date	Dec. 31, 2026
State and Local Jurisdiction [Member] | System Energy [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	$ 0
Tax credits, Carryover Amount	13,100
Other Federal And State [Member]
Operating Loss Carryforwards [Line Items]
Tax credits, Carryover Amount	$ 77,500
Minimum [Member] | Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2023
Minimum [Member] | Federal [Member] | Entergy Louisiana [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2035
Minimum [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2021
Minimum [Member] | State and Local Jurisdiction [Member] | Entergy Arkansas [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2023
Minimum [Member] | State and Local Jurisdiction [Member] | Entergy Louisiana [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2035
Minimum [Member] | State and Local Jurisdiction [Member] | Entergy Mississippi [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2038
Minimum [Member] | State and Local Jurisdiction [Member] | Entergy New Orleans [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2037
Minimum [Member] | State and Local Jurisdiction [Member] | System Energy [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2021
Minimum [Member] | Other Federal And State [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2021
Minimum [Member] | Other Federal And State [Member] | Entergy Arkansas [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2038
Minimum [Member] | Other Federal And State [Member] | Entergy Louisiana [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2035
Minimum [Member] | Other Federal And State [Member] | Entergy Mississippi [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2038
Minimum [Member] | Other Federal And State [Member] | Entergy New Orleans [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2037
Minimum [Member] | Other Federal And State [Member] | Entergy Texas [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2029
Minimum [Member] | Other Federal And State [Member] | System Energy [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2029
Minimum [Member] | Other Federal [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2021
Maximum [Member] | Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2037
Maximum [Member] | Federal [Member] | Entergy Louisiana [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2037
Maximum [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2040
Maximum [Member] | State and Local Jurisdiction [Member] | Entergy Arkansas [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2025
Maximum [Member] | State and Local Jurisdiction [Member] | Entergy Louisiana [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2040
Maximum [Member] | State and Local Jurisdiction [Member] | Entergy Mississippi [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2040
Maximum [Member] | State and Local Jurisdiction [Member] | Entergy New Orleans [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2040
Maximum [Member] | State and Local Jurisdiction [Member] | System Energy [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2023
Maximum [Member] | Other Federal And State [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2040
Maximum [Member] | Other Federal And State [Member] | Entergy Arkansas [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2040
Maximum [Member] | Other Federal And State [Member] | Entergy Louisiana [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2040
Maximum [Member] | Other Federal And State [Member] | Entergy Mississippi [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2040
Maximum [Member] | Other Federal And State [Member] | Entergy New Orleans [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2040
Maximum [Member] | Other Federal And State [Member] | Entergy Texas [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2040
Maximum [Member] | Other Federal And State [Member] | System Energy [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2040
Maximum [Member] | Other Federal [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2025