Income Taxes (Schedule Of Estimated Tax Attributes Carryovers And Their Expiration Dates) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Operating Loss Carryforwards [Line Items]
Capital losses, Carryover Amount	$ 16,738	$ 18,470
Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	10,700,000
Federal [Member] | Entergy Arkansas [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	77,000
Tax credits, Carryover Amount	2,700
Federal [Member] | Entergy Louisiana [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	4,300,000
Tax credits, Carryover Amount	1,700
Federal [Member] | Entergy Mississippi [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	86,600
Tax credits, Carryover Amount	2,700
Federal [Member] | Entergy New Orleans [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	$ 1,100
Operating losses, Year(s) of expiration	Dec. 31, 2037
Tax credits, Carryover Amount	$ 2,100
Federal [Member] | Entergy Texas [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	0
Tax credits, Carryover Amount	600
Federal [Member] | System Energy [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	0
Tax credits, Carryover Amount	2,500
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	9,600,000
State and Local Jurisdiction [Member] | Entergy Arkansas [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	0
Tax credits, Carryover Amount	0
State and Local Jurisdiction [Member] | Entergy Louisiana [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	5,000,000
Tax credits, Carryover Amount	0
State and Local Jurisdiction [Member] | Entergy Mississippi [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	0
Tax credits, Carryover Amount	4,900
State and Local Jurisdiction [Member] | Entergy New Orleans [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Carryover Amount	$ 1,200
Operating losses, Year(s) of expiration	Dec. 31, 2037
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	$ 3,200
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	10,000
Other Federal And State [Member]
Operating Loss Carryforwards [Line Items]
Tax credits, Carryover Amount	$ 96,600
Minimum [Member] | Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2023
Minimum [Member] | Federal [Member] | Entergy Arkansas [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2030
Minimum [Member] | Federal [Member] | Entergy Louisiana [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2035
Minimum [Member] | Federal [Member] | Entergy Mississippi [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2030
Minimum [Member] | State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2018
Minimum [Member] | State and Local Jurisdiction [Member] | Entergy Louisiana [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2029
Minimum [Member] | State and Local Jurisdiction [Member] | Entergy Mississippi [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2018
Minimum [Member] | State and Local Jurisdiction [Member] | System Energy [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2018
Minimum [Member] | Other Federal And State [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2018
Minimum [Member] | Other Federal [Member] | Entergy Arkansas [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2029
Minimum [Member] | Other Federal [Member] | Entergy Louisiana [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2029
Minimum [Member] | Other Federal [Member] | Entergy Mississippi [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2029
Minimum [Member] | Other Federal [Member] | Entergy New Orleans [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2029
Minimum [Member] | Other Federal [Member] | Entergy Texas [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2029
Minimum [Member] | Other Federal [Member] | System Energy [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2029
Maximum [Member] | Federal [Member]
Operating Loss Carryforwards [Line Items]
Operating losses, Year(s) of expiration	Dec. 31, 2037
Maximum [Member] | Federal [Member] | Entergy Arkansas [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] | Federal [Member] | Entergy Mississippi [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, 2037
Maximum [Member] | State and Local Jurisdiction [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] | Entergy Mississippi [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2021
Maximum [Member] | State and Local Jurisdiction [Member] | System Energy [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2021
Maximum [Member] | Other Federal And State [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2036
Maximum [Member] | Other Federal [Member] | Entergy Arkansas [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2036
Maximum [Member] | Other Federal [Member] | Entergy Louisiana [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2036
Maximum [Member] | Other Federal [Member] | Entergy Mississippi [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2036
Maximum [Member] | Other Federal [Member] | Entergy New Orleans [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2036
Maximum [Member] | Other Federal [Member] | Entergy Texas [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2036
Maximum [Member] | Other Federal [Member] | System Energy [Member]
Operating Loss Carryforwards [Line Items]
Tax Credit Carryforward, Expiration Date	Dec. 31, 2036