Revolving Credit Facilities, Lines Of Credit, Short-Term Borrowings, And Long-Term Debt Revolving Credit Facilities, Lines Of Credit, Short-Term Borrowings, And Long-Term Debt (Uncommitted Standby Letter of Credit Facilities to Support MISO Obligations) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Letters of Credit Outstanding, Amount	$ 69,000	$ 34,000
Entergy Arkansas [Member]
Letters of Credit Outstanding, Amount	200	200
Entergy Mississippi [Member]
Letters of Credit Outstanding, Amount	100	100
Entergy Texas [Member]
Letters of Credit Outstanding, Amount	200	$ 50
Credit Facility Of Twenty Five Million [Member] | Entergy Arkansas [Member]
Uncommitted Credit Facility	$ 25,000
Letter of Credit Fee, Percentage	0.70%
Letters of Credit Outstanding, Amount	$ 1,000
Credit Facility of Fifty Million [Member] | Entergy Texas [Member]
Uncommitted Credit Facility	$ 50,000
Letter of Credit Fee, Percentage	0.70%
Letters of Credit Outstanding, Amount	$ 25,600
Credit Facility of Forty Million [Member] | Entergy Mississippi [Member]
Uncommitted Credit Facility	$ 40,000
Letter of Credit Fee, Percentage	0.70%
Letters of Credit Outstanding, Amount	$ 16,600
Credit Facility of Fifteen Million [Member] | Entergy New Orleans [Member]
Uncommitted Credit Facility	$ 15,000
Letter of Credit Fee, Percentage	1.00%
Letters of Credit Outstanding, Amount	$ 4,800
Credit Facility Of One Hundred Twenty Five Million [Member] | Entergy Louisiana [Member]
Uncommitted Credit Facility	$ 125,000
Letter of Credit Fee, Percentage	0.70%
Letters of Credit Outstanding, Amount	$ 23,800