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 ($)	Sep. 30, 2020	Dec. 31, 2019
Entergy Arkansas [Member]
Letters of Credit Outstanding, Amount	$ 1,900,000
Entergy Mississippi [Member]
Letters of Credit Outstanding, Amount	700,000	$ 200,000
Entergy Louisiana [Member]
Letters of Credit Outstanding, Amount	2,200,000
Entergy New Orleans [Member]
Letters of Credit Outstanding, Amount	200,000
Credit Facility Of Twenty Five Million [Member] | Entergy Arkansas [Member]
Uncommitted Credit Facility	$ 25,000,000
Letter of Credit Fee, Percentage	0.78%
Letters of Credit Outstanding, Amount	$ 3,000,000
Credit Facility of Fifty Million [Member] | Entergy Texas [Member]
Uncommitted Credit Facility	$ 50,000,000
Letter of Credit Fee, Percentage	0.70%
Letters of Credit Outstanding, Amount	$ 27,200,000
Credit Facility of Fifteen Million [Member] | Entergy New Orleans [Member]
Uncommitted Credit Facility	$ 15,000,000
Letter of Credit Fee, Percentage	1.00%
Letters of Credit Outstanding, Amount	$ 1,000,000
Credit Facility Of One Hundred Twenty Five Million [Member] | Entergy Louisiana [Member]
Uncommitted Credit Facility	$ 125,000,000
Letter of Credit Fee, Percentage	0.78%
Letters of Credit Outstanding, Amount	$ 21,200,000
Credit Facility of Sixty Five Million [Member] | Entergy Mississippi [Member]
Uncommitted Credit Facility	$ 65,000,000
Letter of Credit Fee, Percentage	0.78%
Letters of Credit Outstanding, Amount	$ 1,000,000